Coherent addition of fiber lasers by use of a fiber coupler

Size: px
Start display at page:

Download "Coherent addition of fiber lasers by use of a fiber coupler"

Transcription

1 Coherent addition of fiber lasers by use of a fiber coupler Akira Shirakawa, Tomoharu Saitou, Tomoki Sekiguchi, and Ken-ichi Ueda Institute for Laser Science, University of Electro-Communications akira@ils.uec.ac.jp, ueda@ils.uec.ac.jp Abstract: Coherent addition of fiber lasers coupled with an intracavity fiber coupler is reported. Almost a single output is obtained from one of the fiber ports, which one can switch simply by unbalancing the losses in the ports. We show that the constructive supermodes, each of which has a single output in a different port, build up automatically because of the dense longitudinal-mode, length-unbalanced laser array with unbalanced port loss. High addition efficiencies of 93.6% for two fiber lasers and 95.6% for four fiber lasers have been obtained. 22 Optical Society of America OCIS codes: (14.351) Lasers, fiber; (14.329) Laser arrays; (14.341) Laser resonators, (6.181) Couplers, switches, and multiplexers References and links 1. D. Botez and D. R. Scifres eds., Diode Laser Arrays (Cambridge University Press, 1994). 2. V. V. Apollonov, S. I. Derzhavin, V. I. Kislov, V. V. Kuzminov, D. A. Mashkovsky, and A. M. Prokhorov, Phase-locking of the 2D structures, Opt. Express 4, (1999), 3. M. Wrage, P. Glas, and M. Leitner, Combined phase-locking and beam shaping of a multicore fiber laser by structured mirrors, Opt. Lett. 26, (21). 4. P. K. Cheo, A. Liu, and G. G. King, A high-brightness laser beam from a phase-locked multicore Ybdoped fiber laser array, IEEE Photon. Tech. Lett. 13, (21). 5. V. A. Kozlov, J. Hernández-Cordero, and T. F. Morse, All-fiber coherent beam combining of fiber lasers, Opt. Lett. 24, (1999). 6. E. M. Dianov, M. V. Grekov, I. A. Bufetov, S. A. Vasiliev, O. I. Medvedkov, V. G. Plotnichenko, V. V. Koltashev, A. V. Belov, M. M. Bubnov, S. L. Semjonov, and A. M. Prokhorov, CW high power 1.24µm and 1.48µm Raman lasers based on low loss phosphosilicate fibre, Electron. Lett. 33, (1997). 7. N. S. Kim, M. Prabhu, C. Li, J. Song, and K. Ueda, Output characteristics of P-doped Raman fiber laser at 1484 nm with 2.11 W maximum output power pumped by CW 164 nm Yb-doped double-clad fiber laser, Jpn. J. Appl. Phys. 39, (2). 8. D. Mehuys, K. Mitsunaga, L. Eng, W. K. Marshall, and A. Yariv, Supermode control in diffractioncoupled semiconductor laser arrays, Appl. Phys. Lett. 53, (1988). 9. N. M. Lyndin, V. A. Sychugov, A. E. Tikhomirov, and A. A. Abramov, Laser system composed of several active elements connected by single-mode couplers, Quantum Electron. 24, (1994). 1. P. W. Smith, Stabilized, single-frequency output from a long laser cavity, IEEE J. Quantum Electron. QE-1, (1965). 11. P. Barnsley, P. Urquhart, C. Millar, and M. Brierley, Fiber Fox-Smith resonators: application to singlelongitudinal-mode operation of fiber lasers, J. Opt. Soc. Am. A 5, (1988). 1. Introduction Combining coherent laser beams is an important and challenging area of laser science. Achieving a single output of both high-power and high-brightness from many moderatepower lasers as well as coherent control of beam deflection without mechanical movements are goals which, if achieved, promise a great number of scientific and industrial applications. Many researchers have investigated phase-locked laser arrays with versatile methods to obtain a diffraction-limited beam at the far field [1-4]. High-power operations with high addition efficiencies are often limited because of the small threshold difference among the supermodes # $15. US Received July 15, 22; Revised October 9, 22 (C) 22 OSA 21 October 22 / Vol. 1, No. 21 / OPTICS EXPRESS 1167

2 and the increased cavity loss. Coherent laser arrays phase-locked to form a single beam at the near field with all-waveguide configurations are attractive owing to their inherent fine beam quality and low-loss property. Kozlov et al. [5] reported coherent beam combining of two fiber lasers by using one half of a 2 2 fused-fiber coupler. In an overcoupled regime a single beam is formed on the common cleaved facet at the center of the coupler. Here we report that coherent addition of N fiber lasers can be realized even by use of an N N fused-fiber coupler as the combiner. Nearly N-times higher output power was successfully obtained as a single-beam fiber output from one of the N fiber ports in the cases of N =2andN =4.Bothlengthdifferenceamong the laser arms and loss imbalance among the ports originate the selective excitation of the supermodes to output a coherently added single beam from one of the ports. We can achieve a significant amount of threshold difference among the supermodes simply by applying losses in the ports except for the target port that ensures high addition efficiency even far-above threshold as well as sophisticated output-port switching capability. These outstanding features promise versatile applications. 2. Coherent addition of two fiber lasers The experimental setup of the coherent fiber laser array with two lasers is shown in Fig. 1. The pump source was a self-made phosphosilicate fiber Raman laser with a maximum power of 4.7 W at 1484 nm [6,7]. The output was split into two by a 5:5 fiber coupler and each pumped one of the fiber lasers (laser A/B) with a 2.5-W power by means of a 1484/1557-nm wavelength-division multiplexing (WDM) coupler. The gain fibers were 6-m-long singlemode Er-doped fibers (Nufern Model EDF555), and the fiber of laser A was looped into a polarization controller. Each laser cavity was formed by a fiber Bragg grating (FBG) (R ~ 99% with a FWHM of.6 nm centered at the Bragg wavelength of λ Bragg A = nm for FBG A and λ Bragg B = nm for FBG B) and 3.4% Fresnel reflection at the output cleaved facet. We were able to tune λ Bragg A to longer wavelengths by stretching the fiber. In the case of an independent array (dashed lines in Fig. 1), the maximum output powers of lasers A and B were P A = 1.36 and P B = 1.47 W, respectively. The small imbalance of the power is due to the internal loss difference between the WDM couplers. When both lasers were connected by a 5:5 fused-fiber coupler, the outputs became unequal but one sided to one of the two fiber ports (Port A/B). The power distribution was sensitive to the conditions of the cleaved facets and bending losses of both ports. We found that higher power was always emitted from the port with a lower loss. In one case we obtained the most unbalanced output powers of P A = 2.57 and P B =.17 W after adjustment of the polarization controller, which corresponded to an addition efficiency of more than 9%. Note that cavity length control was not implemented. The evolution of output powers in both cases of the independent and coupled array is shown in Fig. 2, clearly indicating no evidence of any nonlinear effects or decrease in addition efficiency. Both outputs of the coupled array have almost the same spectral shape around the middle of the spectra of the independent array (inset in Fig. 2). Figure 3 shows the spectral and power changes of the outputs from ports A and B when we tuned λ Bragg A from to nm by stretching FBG A. The coupling state was kept for the detuning δλ = λ Bragg A-λ Bragg B less than.5 nm, which is nearly equal to the FBG bandwidth. The addition efficiency was almost constant in this region. For δλ >.5 nm, both spectra exhibited perfectly separated double-peak shapes at the two Bragg wavelengths and the powers were distributed almost equally in both ports, indicating an incoherent array without any coupling. Applying additional loss in the fiber ports can reverse the higher-power port of the coupled array. Figure 4 shows the change in output powers with increased curvature of the looped part of the initial higher-power port A. In this case λ Bragg A = λ Bragg B = nm, which was used throughout the following experiments. In the transition region with the applied loss from ~6% to 1% the powers were unstable and competed with each other, but the powers were # $15. US Received July 15, 22; Revised October 9, 22 (C) 22 OSA 21 October 22 / Vol. 1, No. 21 / OPTICS EXPRESS 1168

3 sufficiently stable outside this region. The total power was reduced in the transition region but almost recovered when a large portion of the output power was transferred to port B. FBG A tuning FBG B PC 6m EDF 2 laser A arm A pump WDM 2 arm B laser B 2.5W@1484nm 5:5 pump 2.5W@1484nm port A port B press P A P B Fig. 1. Experimental setup of the fiber laser array. The dashed lines indicate the independent array without a 5:5 fused-fiber coupler. PC, polarization controller; EDF, Er-doped fiber Output Power (W) Wavelength (nm) Power (W/nm) PA (coupled) PB (indep.) PA (indep.).5 PB (coupled) Pump Power (W) Fig. 2. Dependence of the output powers on the pump power launched on each WDM coupler. P A (red) and P B (blue) of the initial independent array (open circles) and those of the coupled array (filled circles) are shown. Inset: spectra of the port A (red) and port B (blue) outputs for the independent array (dashed curves) and the coupled array (solid curves) at maximum pumping. Power (W/nm) (a) Wavelength (nm) Wavelength (nm) Output Power (W) P A P B P A +P B (b) Detuning (nm) Fig. 3. Change with tuning λ Bragg A. (a) Spectra of port A (red curves) and port B (blue curves) outputs. The positions of λ Bragg A and λ Bragg B are indicated by red and blue dashed lines, respectively. (b) P A (red filled circles), P B (blue filled circles), and P A +P B (filled squares). # $15. US Received July 15, 22; Revised October 9, 22 (C) 22 OSA 21 October 22 / Vol. 1, No. 21 / OPTICS EXPRESS 1169

4 P A +P B Power (W) P A P B Applied Loss (%) Fig. 4. Dependence of P A (red filled circles), P B (blue filled circles), and P A +P B (filled squares) on the additional loss applied to port A. 3. Coupling mechanisms and characteristics The behavior described above can be understood with the supermode theory [8]. If an array is composed of two identical cavities, only in-phase and/or out-of-phase supermodes will oscillate, and the output power should always be equivalent in both ports. The array reported here, however, was composed of cavities with different fiber lengths, which is inevitable when one cuts and splices fibers and fiber components. We found that the length difference L = L B - L A between arm A and arm B (left-hand side parts from the 5:5 fiber coupler in Fig. 1) oftenamounteduptomorethantencentimeters.insuchcases,wavelengthsthatsatisfythe condition β L = (m + 1/2)π (m is an integer and β is the propagation constant) give two constructive supermodes with a single output from one of the ports by the coherent addition of fields from the gain media. We refer to these modes as Y modes (Y A and Y B with the axes corresponding to port A and port B, respectively) because the character Y is a good representation of the energy flow in the laser array. In our experiments such wavelengths can always exist within the bandwidth of the FBGs because of the dense longitudinal-mode (<1- MHz mode spacing) feature as well as small L in comparison with the cavity length (Vernier effect), and any fine adjustments of the fiber length become unnecessary. The loss imbalance between the two ports places one of the Y modes at the lowest threshold among the possible modes including in-phase and out-of-phase modes, and the preferable single output is generated. The unstable behavior and reduction of the total power in the transition region in Fig. 4 indicate a mode competition that is due to loss balancing and the resultant increase of the net cavity loss, respectively. Lyndin and his co-workers reported a similar experimental apparatus in 1994 [9]. They connected two fiber lasers by a clad-polished fiber coupler, placed an R = 95% mirror at one of the fiber port exits, and obtained ~2-µW output power from the mirror port with an addition efficiency of ~95%. This result is well understood by the presented Y-mode picture: the output power is concentrated in the lower threshold mode with the mirror. Lyndin et al. also indicated the importance of arm-length difference for automatic satisfaction of the constructive interference condition. However, details of the coupling behavior were not made clear. We studied the longitudinal-mode structure of our coupled array by measuring the beat spectra of both port outputs with a fast photodetector and a radio-frequency spectrum analyzer (Anritsu Model MS2661C). The fiber lengths were estimated to an accuracy of ±1 mm. Figure 5 shows the beat spectra with L =.341 m. By assuming the mode index of n = 1.45, we predicted frequency spacing of Y modes to be ν Y = c/(2n L) = 33 MHz, which is in fairly good agreement with the observed spacing (~3 MHz) among the peak frequencies in the individual beat packet. By changing L from.98 to.1 m, we expanded the spacing among the beat peaks in accordance with ν Y = c/(2n L), whereas the number of beats in one beat packet increased with the almost invariant addition efficiency. The beat spectrum of the port B output is rather complicated. In addition to the main beats at the same positions as # $15. US Received July 15, 22; Revised October 9, 22 (C) 22 OSA 21 October 22 / Vol. 1, No. 21 / OPTICS EXPRESS 117

5 those of the port A output, there are side wings with frequency offsets. The latter component can be dramatically decreased if we prevent reflection from the exit facet of port B by splicing an FC/APC connector. The origin of this component could be due to excitation of a different polarization component in the Y A mode with a slightly different mode index. The return losses of the fiber couplers are less than 1-4 % and no parasitic resonance effects will occur. Suppressing the energy dissipation by preventing reflection or by applying an infinite loss in port B increases P A and the addition efficiency. For the array with L =.341 m, we increased P A from 2.57 to 2.65 W by immersing the facet in index-matching oil or by crushing the looped part of port B. The addition efficiency amounted to 93.6%. Power (a.u., db) Power (a.u., db) (a) Beat Frequency (MHz) (b) Port A Port B Beat Frequency (MHz) Fig. 5. (a) Beat spectra of the port A output (red curves) and port B output (blue curves) when the Y A mode was excited at L =.341 m. Fine structures of the port B output are smeared out because of limited resolution. (b) Beat spectra with higher resolution. The coupled array with infinite loss in one of the ports is equivalent to a Fox Smith resonator [1,11], which was investigated mainly for single-longitudinal-mode operation of a single laser. Figure 6 shows the line-shape functions g 1 (ν) and g 2 (ν) defined as the transmittance of a light launched on port A to arm A and to port B (no feedback), respectively, for arrays with L =.341 m, L A = M, and l A = M (l A is the length of port A) [11]. Because the line-shape function of each laser in an independent array (simple Fabry Perot resonators) has a peak transmittance of T max = T 1 T 2 /[1-(R 1 R 2 ) 1/2 ] 2 =.145 (R 1 =.99, R 2 =.34, and T i =1-R i ), the peak value of.725 in g 1 (ν) means a 1% addition efficiency, where the exact double-resonance condition is satisfied. Leakage to port B occurs when the sidebands are excited, as was observed as beat packets in Fig. 5, which explains the main beat component in the port B output and slightly degrades the addition efficiency. The mode spacing of the sidebands in the line-shape functions is given as c/(2nl av ) = 8.56 MHz [L av = (L A + L B )/2 + l A, the average cavity length], which is in good agreement with the experimental results. Insertion loss of the fiber coupler (~3%) also reduces the efficiency and could provide an essential factor in the present experiment. The decrease of efficiency caused by the power difference between laser A and laser B as well as the unbalanced branching ratio of the coupler (maximum ±2%) is estimated to be less than.2% and is, therefore, negligible. # $15. US Received July 15, 22; Revised October 9, 22 (C) 22 OSA 21 October 22 / Vol. 1, No. 21 / OPTICS EXPRESS 1171

6 .8 Y A Y A g 1 (ν) g 2 (ν) Frequency (MHz) Fig. 6. Line-shape functions g 1 (ν) (red curve) and g 2 (ν) (blue curve) at the lowest frequency region in the Fox Smith limit. Characters Y A indicate the positions of the Y A modes estimated from the beat spectrum in Fig Coherent addition of four fiber lasers The coherent addition of four fiber lasers has been successfully demonstrated; see the experimental setup in Fig. 7. Each Er-doped fiber laser was equivalent to the laser explained above and coupled with a 4 4, 25:25:25:25 fused-fiber coupler. Bragg wavelengths of the FBGs were all approximately nm. Only two were equipped with polarization controllers for practical reasons. Three fiber ports were immersed in index-matching oil to obtain the highest power from the fourth port. The output powers of the initial independent array were.68,.65,.62, and.61 W for each pump power of 1. W, whereas output power of 2.45 W was obtained from the fourth port of the coupled array, which corresponds to an addition efficiency of as high as 95.6%. Further details of the coupling properties as well as the scalability of the number of fiber lasers are now under investigation. PC single output 25:25:25:25 FBG 4 6m EDF 4 PC WDM 4 index matching oil Fig. 7. Experimental setup of the N = 4 fiber laser array. PC, polarization controller; EDF, Erdoped fiber. 5. Conclusions Highly efficient coherent addition of N = 2 and N = 4 fiber lasers was achieved with intracavity N N fused-fiber couplers. Our method for combining multiple lasers has many favorable features such as high addition efficiency, fine switching capability, and an all-fiber configuration that maintains a single transverse mode. Many applications to high-power lasers, laser processing, and optical communications are expected. Acknowledgments The authors are grateful for the useful discussions with M. Musha, S. A. Vasiliev, and A. Hideur. # $15. US Received July 15, 22; Revised October 9, 22 (C) 22 OSA 21 October 22 / Vol. 1, No. 21 / OPTICS EXPRESS 1172

Efficient All-fiber Passive Coherent Combining of Fiber Lasers

Efficient All-fiber Passive Coherent Combining of Fiber Lasers Efficient All-fiber Passive Coherent Combining of Fiber Lasers Baishi Wang (1), Eric Mies (1), Monica Minden (2), Anthony Sanchez (3) (1) Vytran, LLC, 14 Campus Drive, Morganville, NJ 7751, (2) HRL Laboratories,

More information

Multi-wavelength laser generation with Bismuthbased Erbium-doped fiber

Multi-wavelength laser generation with Bismuthbased Erbium-doped fiber Multi-wavelength laser generation with Bismuthbased Erbium-doped fiber H. Ahmad 1, S. Shahi 1 and S. W. Harun 1,2* 1 Photonics Research Center, University of Malaya, 50603 Kuala Lumpur, Malaysia 2 Department

More information

Elimination of Self-Pulsations in Dual-Clad, Ytterbium-Doped Fiber Lasers

Elimination of Self-Pulsations in Dual-Clad, Ytterbium-Doped Fiber Lasers Elimination of Self-Pulsations in Dual-Clad, Ytterbium-Doped Fiber Lasers 1.0 Modulation depth 0.8 0.6 0.4 0.2 0.0 Laser 3 Laser 2 Laser 4 2 3 4 5 6 7 8 Absorbed pump power (W) Laser 1 W. Guan and J. R.

More information

Active mode-locking of miniature fiber Fabry-Perot laser (FFPL) in a ring cavity

Active mode-locking of miniature fiber Fabry-Perot laser (FFPL) in a ring cavity Active mode-locking of miniature fiber Fabry-Perot laser (FFPL) in a ring cavity Shinji Yamashita (1)(2) and Kevin Hsu (3) (1) Dept. of Frontier Informatics, Graduate School of Frontier Sciences The University

More information

Optical Fibers p. 1 Basic Concepts p. 1 Step-Index Fibers p. 2 Graded-Index Fibers p. 4 Design and Fabrication p. 6 Silica Fibers p.

Optical Fibers p. 1 Basic Concepts p. 1 Step-Index Fibers p. 2 Graded-Index Fibers p. 4 Design and Fabrication p. 6 Silica Fibers p. Preface p. xiii Optical Fibers p. 1 Basic Concepts p. 1 Step-Index Fibers p. 2 Graded-Index Fibers p. 4 Design and Fabrication p. 6 Silica Fibers p. 6 Plastic Optical Fibers p. 9 Microstructure Optical

More information

S-band gain-clamped grating-based erbiumdoped fiber amplifier by forward optical feedback technique

S-band gain-clamped grating-based erbiumdoped fiber amplifier by forward optical feedback technique S-band gain-clamped grating-based erbiumdoped fiber amplifier by forward optical feedback technique Chien-Hung Yeh 1, *, Ming-Ching Lin 3, Ting-Tsan Huang 2, Kuei-Chu Hsu 2 Cheng-Hao Ko 2, and Sien Chi

More information

Cost-effective wavelength-tunable fiber laser using self-seeding Fabry-Perot laser diode

Cost-effective wavelength-tunable fiber laser using self-seeding Fabry-Perot laser diode Cost-effective wavelength-tunable fiber laser using self-seeding Fabry-Perot laser diode Chien Hung Yeh, 1* Fu Yuan Shih, 2 Chia Hsuan Wang, 3 Chi Wai Chow, 3 and Sien Chi 2, 3 1 Information and Communications

More information

Ring cavity tunable fiber laser with external transversely chirped Bragg grating

Ring cavity tunable fiber laser with external transversely chirped Bragg grating Ring cavity tunable fiber laser with external transversely chirped Bragg grating A. Ryasnyanskiy, V. Smirnov, L. Glebova, O. Mokhun, E. Rotari, A. Glebov and L. Glebov 2 OptiGrate, 562 South Econ Circle,

More information

CONTROLLABLE WAVELENGTH CHANNELS FOR MULTIWAVELENGTH BRILLOUIN BISMUTH/ERBIUM BAS-ED FIBER LASER

CONTROLLABLE WAVELENGTH CHANNELS FOR MULTIWAVELENGTH BRILLOUIN BISMUTH/ERBIUM BAS-ED FIBER LASER Progress In Electromagnetics Research Letters, Vol. 9, 9 18, 29 CONTROLLABLE WAVELENGTH CHANNELS FOR MULTIWAVELENGTH BRILLOUIN BISMUTH/ERBIUM BAS-ED FIBER LASER H. Ahmad, M. Z. Zulkifli, S. F. Norizan,

More information

To generate a broadband light source by using mutually injection-locked Fabry-Perot laser diodes

To generate a broadband light source by using mutually injection-locked Fabry-Perot laser diodes To generate a broadband light source by using mutually injection-locked Fabry-Perot laser diodes Cheng-Ling Ying 1, Yu-Chieh Chi 2, Chia-Chin Tsai 3, Chien-Pen Chuang 3, and Hai-Han Lu 2a) 1 Department

More information

Lecture 6 Fiber Optical Communication Lecture 6, Slide 1

Lecture 6 Fiber Optical Communication Lecture 6, Slide 1 Lecture 6 Optical transmitters Photon processes in light matter interaction Lasers Lasing conditions The rate equations CW operation Modulation response Noise Light emitting diodes (LED) Power Modulation

More information

Multiwatts narrow linewidth fiber Raman amplifiers

Multiwatts narrow linewidth fiber Raman amplifiers Multiwatts narrow linewidth fiber Raman amplifiers Yan Feng *, Luke Taylor, and Domenico Bonaccini Calia European Southern Observatory, Karl-Schwarzschildstr., D-878 Garching, Germany * Corresponding author:

More information

A broadband fiber ring laser technique with stable and tunable signal-frequency operation

A broadband fiber ring laser technique with stable and tunable signal-frequency operation A broadband fiber ring laser technique with stable and tunable signal-frequency operation Chien-Hung Yeh 1 and Sien Chi 2, 3 1 Transmission System Department, Computer & Communications Research Laboratories,

More information

High brightness semiconductor lasers M.L. Osowski, W. Hu, R.M. Lammert, T. Liu, Y. Ma, S.W. Oh, C. Panja, P.T. Rudy, T. Stakelon and J.E.

High brightness semiconductor lasers M.L. Osowski, W. Hu, R.M. Lammert, T. Liu, Y. Ma, S.W. Oh, C. Panja, P.T. Rudy, T. Stakelon and J.E. QPC Lasers, Inc. 2007 SPIE Photonics West Paper: Mon Jan 22, 2007, 1:20 pm, LASE Conference 6456, Session 3 High brightness semiconductor lasers M.L. Osowski, W. Hu, R.M. Lammert, T. Liu, Y. Ma, S.W. Oh,

More information

Pump noise as the source of self-modulation and self-pulsing in Erbium fiber laser

Pump noise as the source of self-modulation and self-pulsing in Erbium fiber laser Pump noise as the source of self-modulation and self-pulsing in Erbium fiber laser Yuri O. Barmenkov and Alexander V. Kir yanov Centro de Investigaciones en Optica, Loma del Bosque 5, Col. Lomas del Campestre,

More information

Photonics (OPTI 510R 2017) - Final exam. (May 8, 10:30am-12:30pm, R307)

Photonics (OPTI 510R 2017) - Final exam. (May 8, 10:30am-12:30pm, R307) Photonics (OPTI 510R 2017) - Final exam (May 8, 10:30am-12:30pm, R307) Problem 1: (30pts) You are tasked with building a high speed fiber communication link between San Francisco and Tokyo (Japan) which

More information

Stable dual-wavelength oscillation of an erbium-doped fiber ring laser at room temperature

Stable dual-wavelength oscillation of an erbium-doped fiber ring laser at room temperature Stable dual-wavelength oscillation of an erbium-doped fiber ring laser at room temperature Donghui Zhao.a, Xuewen Shu b, Wei Zhang b, Yicheng Lai a, Lin Zhang a, Ian Bennion a a Photonics Research Group,

More information

Optical fiber-fault surveillance for passive optical networks in S-band operation window

Optical fiber-fault surveillance for passive optical networks in S-band operation window Optical fiber-fault surveillance for passive optical networks in S-band operation window Chien-Hung Yeh 1 and Sien Chi 2,3 1 Transmission System Department, Computer and Communications Research Laboratories,

More information

Introduction Fundamentals of laser Types of lasers Semiconductor lasers

Introduction Fundamentals of laser Types of lasers Semiconductor lasers ECE 5368 Introduction Fundamentals of laser Types of lasers Semiconductor lasers Introduction Fundamentals of laser Types of lasers Semiconductor lasers How many types of lasers? Many many depending on

More information

Multiwavelength Single-Longitudinal-Mode Ytterbium-Doped Fiber Laser. Citation IEEE Photon. Technol. Lett., 2013, v. 25, p.

Multiwavelength Single-Longitudinal-Mode Ytterbium-Doped Fiber Laser. Citation IEEE Photon. Technol. Lett., 2013, v. 25, p. Title Multiwavelength Single-Longitudinal-Mode Ytterbium-Doped Fiber Laser Author(s) ZHOU, Y; Chui, PC; Wong, KKY Citation IEEE Photon. Technol. Lett., 2013, v. 25, p. 385-388 Issued Date 2013 URL http://hdl.handle.net/10722/189009

More information

Optical Amplifiers Photonics and Integrated Optics (ELEC-E3240) Zhipei Sun Photonics Group Department of Micro- and Nanosciences Aalto University

Optical Amplifiers Photonics and Integrated Optics (ELEC-E3240) Zhipei Sun Photonics Group Department of Micro- and Nanosciences Aalto University Photonics Group Department of Micro- and Nanosciences Aalto University Optical Amplifiers Photonics and Integrated Optics (ELEC-E3240) Zhipei Sun Last Lecture Topics Course introduction Ray optics & optical

More information

High order cascaded Raman random fiber laser with high spectral purity

High order cascaded Raman random fiber laser with high spectral purity Vol. 6, No. 5 5 Mar 18 OPTICS EXPRESS 575 High order cascaded Raman random fiber laser with high spectral purity JINYAN DONG,1, LEI ZHANG,1, HUAWEI JIANG,1, XUEZONG YANG,1, WEIWEI PAN,1, SHUZHEN CUI,1

More information

Ultra-short distributed Bragg reflector fiber laser for sensing applications

Ultra-short distributed Bragg reflector fiber laser for sensing applications Ultra-short distributed Bragg reflector fiber laser for sensing applications Yang Zhang 2, Bai-Ou Guan 1,2,*, and Hwa-Yaw Tam 3 1 Institute of Photonics Technology, Jinan University, Guangzhou 510632,

More information

Wavelength switching using multicavity semiconductor laser diodes

Wavelength switching using multicavity semiconductor laser diodes Wavelength switching using multicavity semiconductor laser diodes A. P. Kanjamala and A. F. J. Levi Department of Electrical Engineering University of Southern California Los Angeles, California 989-1111

More information

Stabilisation of Linear-cavity Fibre Laser Using a Saturable Absorber

Stabilisation of Linear-cavity Fibre Laser Using a Saturable Absorber Edith Cowan University Research Online ECU Publications 2011 2011 Stabilisation of Linear-cavity Fibre Laser Using a Saturable Absorber David Michel Edith Cowan University Feng Xiao Edith Cowan University

More information

DESIGN AND CHARACTERIZATION OF HIGH PERFORMANCE C AND L BAND ERBIUM DOPED FIBER AMPLIFIERS (C,L-EDFAs)

DESIGN AND CHARACTERIZATION OF HIGH PERFORMANCE C AND L BAND ERBIUM DOPED FIBER AMPLIFIERS (C,L-EDFAs) DESIGN AND CHARACTERIZATION OF HIGH PERFORMANCE C AND L BAND ERBIUM DOPED FIBER AMPLIFIERS (C,L-EDFAs) Ahmet Altuncu Arif Başgümüş Burçin Uzunca Ekim Haznedaroğlu e-mail: altuncu@dumlupinar.edu.tr e-mail:

More information

A 100 W all-fiber linearly-polarized Yb-doped single-mode fiber laser at 1120 nm

A 100 W all-fiber linearly-polarized Yb-doped single-mode fiber laser at 1120 nm A 1 W all-fiber linearly-polarized Yb-doped single-mode fiber laser at 112 nm Jianhua Wang, 1,2 Jinmeng Hu, 1 Lei Zhang, 1 Xijia Gu, 3 Jinbao Chen, 2 and Yan Feng 1,* 1 Shanghai Key Laboratory of Solid

More information

Frequency Noise Reduction of Integrated Laser Source with On-Chip Optical Feedback

Frequency Noise Reduction of Integrated Laser Source with On-Chip Optical Feedback MITSUBISHI ELECTRIC RESEARCH LABORATORIES http://www.merl.com Frequency Noise Reduction of Integrated Laser Source with On-Chip Optical Feedback Song, B.; Kojima, K.; Pina, S.; Koike-Akino, T.; Wang, B.;

More information

Optical phase-locked loop for coherent transmission over 500 km using heterodyne detection with fiber lasers

Optical phase-locked loop for coherent transmission over 500 km using heterodyne detection with fiber lasers Optical phase-locked loop for coherent transmission over 500 km using heterodyne detection with fiber lasers Keisuke Kasai a), Jumpei Hongo, Masato Yoshida, and Masataka Nakazawa Research Institute of

More information

High-power semiconductor lasers for applications requiring GHz linewidth source

High-power semiconductor lasers for applications requiring GHz linewidth source High-power semiconductor lasers for applications requiring GHz linewidth source Ivan Divliansky* a, Vadim Smirnov b, George Venus a, Alex Gourevitch a, Leonid Glebov a a CREOL/The College of Optics and

More information

Mode analysis of Oxide-Confined VCSELs using near-far field approaches

Mode analysis of Oxide-Confined VCSELs using near-far field approaches Annual report 998, Dept. of Optoelectronics, University of Ulm Mode analysis of Oxide-Confined VCSELs using near-far field approaches Safwat William Zaki Mahmoud We analyze the transverse mode structure

More information

PERFORMANCE OF PHOTODIGM S DBR SEMICONDUCTOR LASERS FOR PICOSECOND AND NANOSECOND PULSING APPLICATIONS

PERFORMANCE OF PHOTODIGM S DBR SEMICONDUCTOR LASERS FOR PICOSECOND AND NANOSECOND PULSING APPLICATIONS PERFORMANCE OF PHOTODIGM S DBR SEMICONDUCTOR LASERS FOR PICOSECOND AND NANOSECOND PULSING APPLICATIONS By Jason O Daniel, Ph.D. TABLE OF CONTENTS 1. Introduction...1 2. Pulse Measurements for Pulse Widths

More information

Channel wavelength selectable singleõdualwavelength erbium-doped fiber ring laser

Channel wavelength selectable singleõdualwavelength erbium-doped fiber ring laser Channel wavelength selectable singleõdualwavelength erbium-doped fiber ring laser Tong Liu Yeng Chai Soh Qijie Wang Nanyang Technological University School of Electrical and Electronic Engineering Nanyang

More information

Self-organizing laser diode cavities with photorefractive nonlinear crystals

Self-organizing laser diode cavities with photorefractive nonlinear crystals Institut d'optique http://www.iota.u-psud.fr/~roosen/ Self-organizing laser diode cavities with photorefractive nonlinear crystals Nicolas Dubreuil, Gilles Pauliat, Gérald Roosen Nicolas Huot, Laurent

More information

Linear cavity erbium-doped fiber laser with over 100 nm tuning range

Linear cavity erbium-doped fiber laser with over 100 nm tuning range Linear cavity erbium-doped fiber laser with over 100 nm tuning range Xinyong Dong, Nam Quoc Ngo *, and Ping Shum Network Technology Research Center, School of Electrical & Electronics Engineering, Nanyang

More information

RADIO-OVER-FIBER TRANSPORT SYSTEMS BASED ON DFB LD WITH MAIN AND 1 SIDE MODES INJECTION-LOCKED TECHNIQUE

RADIO-OVER-FIBER TRANSPORT SYSTEMS BASED ON DFB LD WITH MAIN AND 1 SIDE MODES INJECTION-LOCKED TECHNIQUE Progress In Electromagnetics Research Letters, Vol. 7, 25 33, 2009 RADIO-OVER-FIBER TRANSPORT SYSTEMS BASED ON DFB LD WITH MAIN AND 1 SIDE MODES INJECTION-LOCKED TECHNIQUE H.-H. Lu, C.-Y. Li, C.-H. Lee,

More information

Study of Multiwavelength Fiber Laser in a Highly Nonlinear Fiber

Study of Multiwavelength Fiber Laser in a Highly Nonlinear Fiber Study of Multiwavelength Fiber Laser in a Highly Nonlinear Fiber I. H. M. Nadzar 1 and N. A.Awang 1* 1 Faculty of Science, Technology and Human Development, Universiti Tun Hussein Onn Malaysia, Johor,

More information

Investigations on Yb-doped CW Fiber Lasers

Investigations on Yb-doped CW Fiber Lasers Investigations on Yb-doped CW Fiber Lasers B.N. Upadhyaya *1, S. Kher 1, M.R. Shenoy 2, K. Thyagarajan 2, T.P.S. Nathan 1 1 Solid State Laser Division, Centre for Advanced Technology, Indore, India-452013

More information

Simultaneous Measurements for Tunable Laser Source Linewidth with Homodyne Detection

Simultaneous Measurements for Tunable Laser Source Linewidth with Homodyne Detection Simultaneous Measurements for Tunable Laser Source Linewidth with Homodyne Detection Adnan H. Ali Technical college / Baghdad- Iraq Tel: 96-4-770-794-8995 E-mail: Adnan_h_ali@yahoo.com Received: April

More information

OPTICAL COMMUNICATIONS S

OPTICAL COMMUNICATIONS S OPTICAL COMMUNICATIONS S-108.3110 1 Course program 1. Introduction and Optical Fibers 2. Nonlinear Effects in Optical Fibers 3. Fiber-Optic Components 4. Transmitters and Receivers 5. Fiber-Optic Measurements

More information

HIGH POWER LASERS FOR 3 RD GENERATION GRAVITATIONAL WAVE DETECTORS

HIGH POWER LASERS FOR 3 RD GENERATION GRAVITATIONAL WAVE DETECTORS HIGH POWER LASERS FOR 3 RD GENERATION GRAVITATIONAL WAVE DETECTORS P. Weßels for the LZH high power laser development team Laser Zentrum Hannover, Germany 23.05.2011 OUTLINE Requirements on lasers for

More information

Gain-clamping techniques in two-stage double-pass L-band EDFA

Gain-clamping techniques in two-stage double-pass L-band EDFA PRAMANA c Indian Academy of Sciences Vol. 66, No. 3 journal of March 2006 physics pp. 539 545 Gain-clamping techniques in two-stage double-pass L-band EDFA S W HARUN 1, N Md SAMSURI 2 and H AHMAD 2 1 Faculty

More information

Demonstration of multi-cavity optoelectronic oscillators based on multicore fibers

Demonstration of multi-cavity optoelectronic oscillators based on multicore fibers Demonstration of multi-cavity optoelectronic oscillators based on multicore fibers Sergi García, Javier Hervás and Ivana Gasulla ITEAM Research Institute Universitat Politècnica de València, Valencia,

More information

3550 Aberdeen Ave SE, Kirtland AFB, NM 87117, USA ABSTRACT 1. INTRODUCTION

3550 Aberdeen Ave SE, Kirtland AFB, NM 87117, USA ABSTRACT 1. INTRODUCTION Beam Combination of Multiple Vertical External Cavity Surface Emitting Lasers via Volume Bragg Gratings Chunte A. Lu* a, William P. Roach a, Genesh Balakrishnan b, Alexander R. Albrecht b, Jerome V. Moloney

More information

Spurious-Mode Suppression in Optoelectronic Oscillators

Spurious-Mode Suppression in Optoelectronic Oscillators Spurious-Mode Suppression in Optoelectronic Oscillators Olukayode Okusaga and Eric Adles and Weimin Zhou U.S. Army Research Laboratory Adelphi, Maryland 20783 1197 Email: olukayode.okusaga@us.army.mil

More information

S Optical Networks Course Lecture 2: Essential Building Blocks

S Optical Networks Course Lecture 2: Essential Building Blocks S-72.3340 Optical Networks Course Lecture 2: Essential Building Blocks Edward Mutafungwa Communications Laboratory, Helsinki University of Technology, P. O. Box 2300, FIN-02015 TKK, Finland Tel: +358 9

More information

All-Optical Clock Division Using Period-one Oscillation of Optically Injected Semiconductor Laser

All-Optical Clock Division Using Period-one Oscillation of Optically Injected Semiconductor Laser International Conference on Logistics Engineering, Management and Computer Science (LEMCS 2014) All-Optical Clock Division Using Period-one Oscillation of Optically Injected Semiconductor Laser Shengxiao

More information

CHAPTER 5 FINE-TUNING OF AN ECDL WITH AN INTRACAVITY LIQUID CRYSTAL ELEMENT

CHAPTER 5 FINE-TUNING OF AN ECDL WITH AN INTRACAVITY LIQUID CRYSTAL ELEMENT CHAPTER 5 FINE-TUNING OF AN ECDL WITH AN INTRACAVITY LIQUID CRYSTAL ELEMENT In this chapter, the experimental results for fine-tuning of the laser wavelength with an intracavity liquid crystal element

More information

Temporal coherence characteristics of a superluminescent diode system with an optical feedback mechanism

Temporal coherence characteristics of a superluminescent diode system with an optical feedback mechanism VI Temporal coherence characteristics of a superluminescent diode system with an optical feedback mechanism Fang-Wen Sheu and Pei-Ling Luo Department of Applied Physics, National Chiayi University, Chiayi

More information

Supplementary Figures

Supplementary Figures Supplementary Figures Supplementary Figure 1: Mach-Zehnder interferometer (MZI) phase stabilization. (a) DC output of the MZI with and without phase stabilization. (b) Performance of MZI stabilization

More information

Low Phase Noise Laser Synthesizer with Simple Configuration Adopting Phase Modulator and Fiber Bragg Gratings

Low Phase Noise Laser Synthesizer with Simple Configuration Adopting Phase Modulator and Fiber Bragg Gratings ALMA Memo #508 Low Phase Noise Laser Synthesizer with Simple Configuration Adopting Phase Modulator and Fiber Bragg Gratings Takashi YAMAMOTO 1, Satoki KAWANISHI 1, Akitoshi UEDA 2, and Masato ISHIGURO

More information

Chapter 1 Introduction

Chapter 1 Introduction Chapter 1 Introduction 1-1 Preface Telecommunication lasers have evolved substantially since the introduction of the early AlGaAs-based semiconductor lasers in the late 1970s suitable for transmitting

More information

DBR based passively mode-locked 1.5m semiconductor laser with 9 nm tuning range Moskalenko, V.; Williams, K.A.; Bente, E.A.J.M.

DBR based passively mode-locked 1.5m semiconductor laser with 9 nm tuning range Moskalenko, V.; Williams, K.A.; Bente, E.A.J.M. DBR based passively mode-locked 1.5m semiconductor laser with 9 nm tuning range Moskalenko, V.; Williams, K.A.; Bente, E.A.J.M. Published in: Proceedings of the 20th Annual Symposium of the IEEE Photonics

More information

High-power All-Fiber components: The missing link for high power fiber lasers

High-power All-Fiber components: The missing link for high power fiber lasers High- All-Fiber components: The missing link for high lasers François Gonthier, Lilian Martineau, Nawfel Azami, Mathieu Faucher, François Séguin, Damien Stryckman, Alain Villeneuve ITF Optical Technologies

More information

R. J. Jones Optical Sciences OPTI 511L Fall 2017

R. J. Jones Optical Sciences OPTI 511L Fall 2017 R. J. Jones Optical Sciences OPTI 511L Fall 2017 Semiconductor Lasers (2 weeks) Semiconductor (diode) lasers are by far the most widely used lasers today. Their small size and properties of the light output

More information

Single mode EDF fiber laser using an ultra-narrow bandwidth tunable optical filter

Single mode EDF fiber laser using an ultra-narrow bandwidth tunable optical filter Indian Journal of Pure & Applied Physics Vol. 53, September 2015, pp. 579-584 Single mode EDF fiber laser using an ultra-narrow bandwidth tunable optical filter N F Razak* 1, H Ahmad 2, M Z Zulkifli 2,

More information

Coherent addition of spatially incoherent light beams

Coherent addition of spatially incoherent light beams Coherent addition of spatially incoherent light beams Amiel A. Ishaaya, Liran Shimshi, Nir Davidson and Asher A. Friesem Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot

More information

Tunable Multiwavelength Erbium-Doped Fiber Laser Employing PM-FBG and Mach Zehnder Interferometer with Optical Fiber Delay Line

Tunable Multiwavelength Erbium-Doped Fiber Laser Employing PM-FBG and Mach Zehnder Interferometer with Optical Fiber Delay Line Open Access Laser Employing PM-FBG and Mach Zehnder Interferometer with Optical Fiber Delay Line Volume 9, Number 3, June 2017 Wei He Da Li Lianqing Zhu Mingli Dong Fei Luo DOI: 10.1109/JPHOT.2017.2695671

More information

Simultaneous pulse amplification and compression in all-fiber-integrated pre-chirped large-mode-area Er-doped fiber amplifier

Simultaneous pulse amplification and compression in all-fiber-integrated pre-chirped large-mode-area Er-doped fiber amplifier Simultaneous pulse amplification and compression in all-fiber-integrated pre-chirped large-mode-area Er-doped fiber amplifier Gong-Ru Lin 1 *, Ying-Tsung Lin, and Chao-Kuei Lee 2 1 Graduate Institute of

More information

Design and Analysis of Resonant Leaky-mode Broadband Reflectors

Design and Analysis of Resonant Leaky-mode Broadband Reflectors 846 PIERS Proceedings, Cambridge, USA, July 6, 8 Design and Analysis of Resonant Leaky-mode Broadband Reflectors M. Shokooh-Saremi and R. Magnusson Department of Electrical and Computer Engineering, University

More information

Optimisation of DSF and SOA based Phase Conjugators. by Incorporating Noise-Suppressing Fibre Gratings

Optimisation of DSF and SOA based Phase Conjugators. by Incorporating Noise-Suppressing Fibre Gratings Optimisation of DSF and SOA based Phase Conjugators by Incorporating Noise-Suppressing Fibre Gratings Paper no: 1471 S. Y. Set, H. Geiger, R. I. Laming, M. J. Cole and L. Reekie Optoelectronics Research

More information

Single-Frequency, 2-cm, Yb-Doped Silica-Fiber Laser

Single-Frequency, 2-cm, Yb-Doped Silica-Fiber Laser Single-Frequency, 2-cm, Yb-Doped Silica-Fiber Laser W. Guan and J. R. Marciante University of Rochester Laboratory for Laser Energetics The Institute of Optics Frontiers in Optics 2006 90th OSA Annual

More information

Mechanism of intrinsic wavelength tuning and sideband asymmetry in a passively mode-locked soliton fiber ring laser

Mechanism of intrinsic wavelength tuning and sideband asymmetry in a passively mode-locked soliton fiber ring laser 28 J. Opt. Soc. Am. B/Vol. 17, No. 1/January 2000 Man et al. Mechanism of intrinsic wavelength tuning and sideband asymmetry in a passively mode-locked soliton fiber ring laser W. S. Man, H. Y. Tam, and

More information

Optical Communications and Networking 朱祖勍. Sept. 25, 2017

Optical Communications and Networking 朱祖勍. Sept. 25, 2017 Optical Communications and Networking Sept. 25, 2017 Lecture 4: Signal Propagation in Fiber 1 Nonlinear Effects The assumption of linearity may not always be valid. Nonlinear effects are all related to

More information

Compact two-mode (de)multiplexer based on symmetric Y-junction and Multimode interference waveguides

Compact two-mode (de)multiplexer based on symmetric Y-junction and Multimode interference waveguides Compact two-mode (de)multiplexer based on symmetric Y-junction and Multimode interference waveguides Yaming Li, Chong Li, Chuanbo Li, Buwen Cheng, * and Chunlai Xue State Key Laboratory on Integrated Optoelectronics,

More information

A WDM passive optical network enabling multicasting with color-free ONUs

A WDM passive optical network enabling multicasting with color-free ONUs A WDM passive optical network enabling multicasting with color-free ONUs Yue Tian, Qingjiang Chang, and Yikai Su * State Key Laboratory of Advanced Optical Communication Systems and Networks, Department

More information

SUPPLEMENTARY INFORMATION

SUPPLEMENTARY INFORMATION Soliton-Similariton Fibre Laser Bulent Oktem 1, Coşkun Ülgüdür 2 and F. Ömer Ilday 2 SUPPLEMENTARY INFORMATION 1 Graduate Program of Materials Science and Nanotechnology, Bilkent University, 06800, Ankara,

More information

Elements of Optical Networking

Elements of Optical Networking Bruckner Elements of Optical Networking Basics and practice of optical data communication With 217 Figures, 13 Tables and 93 Exercises Translated by Patricia Joliet VIEWEG+ TEUBNER VII Content Preface

More information

A tunable and switchable single-longitudinalmode dual-wavelength fiber laser with a simple linear cavity

A tunable and switchable single-longitudinalmode dual-wavelength fiber laser with a simple linear cavity A tunable and switchable single-longitudinalmode dual-wavelength fiber laser with a simple linear cavity Xiaoying He, 1 Xia Fang, 1 Changrui Liao, 1 D. N. Wang, 1,* and Junqiang Sun 2 1 Department of Electrical

More information

Title. Author(s)Saitoh, Fumiya; Saitoh, Kunimasa; Koshiba, Masanori. CitationOptics Express, 18(5): Issue Date Doc URL.

Title. Author(s)Saitoh, Fumiya; Saitoh, Kunimasa; Koshiba, Masanori. CitationOptics Express, 18(5): Issue Date Doc URL. Title A design method of a fiber-based mode multi/demultip Author(s)Saitoh, Fumiya; Saitoh, Kunimasa; Koshiba, Masanori CitationOptics Express, 18(5): 4709-4716 Issue Date 2010-03-01 Doc URL http://hdl.handle.net/2115/46825

More information

RECENTLY, studies have begun that are designed to meet

RECENTLY, studies have begun that are designed to meet 838 IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 43, NO. 9, SEPTEMBER 2007 Design of a Fiber Bragg Grating External Cavity Diode Laser to Realize Mode-Hop Isolation Toshiya Sato Abstract Recently, a unique

More information

All-Fiber Wavelength-Tunable Acoustooptic Switches Based on Intermodal Coupling in Fibers

All-Fiber Wavelength-Tunable Acoustooptic Switches Based on Intermodal Coupling in Fibers 1864 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 20, NO. 10, OCTOBER 2002 All-Fiber Wavelength-Tunable Acoustooptic Switches Based on Intermodal Coupling in Fibers Hee Su Park, Kwang Yong Song, Seok Hyun Yun,

More information

An Amplified WDM-PON Using Broadband Light Source Seeded Optical Sources and a Novel Bidirectional Reach Extender

An Amplified WDM-PON Using Broadband Light Source Seeded Optical Sources and a Novel Bidirectional Reach Extender Journal of the Optical Society of Korea Vol. 15, No. 3, September 2011, pp. 222-226 DOI: http://dx.doi.org/10.3807/josk.2011.15.3.222 An Amplified WDM-PON Using Broadband Light Source Seeded Optical Sources

More information

3 General Principles of Operation of the S7500 Laser

3 General Principles of Operation of the S7500 Laser Application Note AN-2095 Controlling the S7500 CW Tunable Laser 1 Introduction This document explains the general principles of operation of Finisar s S7500 tunable laser. It provides a high-level description

More information

Investigation of the impact of fiber Bragg grating bandwidth on the efficiency of a fiber Raman laser

Investigation of the impact of fiber Bragg grating bandwidth on the efficiency of a fiber Raman laser Investigation of the impact of fiber Bragg grating bandwidth on the efficiency of a fiber Raman laser US-Australia meeting May12, 2015 Leanne J. Henry, Michael Klopfer (1), and Ravi Jain (1) (1) University

More information

Tunable single frequency fiber laser based on FP-LD injection locking

Tunable single frequency fiber laser based on FP-LD injection locking Tunable single frequency fiber laser based on FP-LD injection locking Aiqin Zhang, Xinhuan Feng, * Minggui Wan, Zhaohui Li, and Bai-ou Guan Institute of Photonics Technology, Jinan University, Guangzhou,

More information

Advances in Widely Tunable Lasers Richard Schatz Laboratory of Photonics Royal Institute of Technology

Advances in Widely Tunable Lasers Richard Schatz Laboratory of Photonics Royal Institute of Technology Advances in Widely Tunable Lasers Richard Schatz Laboratory of Photonics Royal Institute of Technology Tunability of common semiconductor lasers Widely tunable laser types Syntune MGY laser: tuning principle

More information

CHIRPED FIBER BRAGG GRATING (CFBG) BY ETCHING TECHNIQUE FOR SIMULTANEOUS TEMPERATURE AND REFRACTIVE INDEX SENSING

CHIRPED FIBER BRAGG GRATING (CFBG) BY ETCHING TECHNIQUE FOR SIMULTANEOUS TEMPERATURE AND REFRACTIVE INDEX SENSING CHIRPED FIBER BRAGG GRATING (CFBG) BY ETCHING TECHNIQUE FOR SIMULTANEOUS TEMPERATURE AND REFRACTIVE INDEX SENSING Siti Aisyah bt. Ibrahim and Chong Wu Yi Photonics Research Center Department of Physics,

More information

Dr. Rüdiger Paschotta RP Photonics Consulting GmbH. Competence Area: Fiber Devices

Dr. Rüdiger Paschotta RP Photonics Consulting GmbH. Competence Area: Fiber Devices Dr. Rüdiger Paschotta RP Photonics Consulting GmbH Competence Area: Fiber Devices Topics in this Area Fiber lasers, including exotic types Fiber amplifiers, including telecom-type devices and high power

More information

Synchronously pumped picosecond all-fibre Raman laser based on phosphorus-doped silica fibre

Synchronously pumped picosecond all-fibre Raman laser based on phosphorus-doped silica fibre Synchronously pumped picosecond all-fibre Raman laser based on phosphorus-doped silica fibre Sergey Kobtsev, 1,2,* Sergey Kukarin, 1 and Alexey Kokhanovskiy 1 1 Division of Laser Physics and Innovative

More information

Optical RI sensor based on an in-fiber Bragg grating. Fabry-Perot cavity embedded with a micro-channel

Optical RI sensor based on an in-fiber Bragg grating. Fabry-Perot cavity embedded with a micro-channel Optical RI sensor based on an in-fiber Bragg grating Fabry-Perot cavity embedded with a micro-channel Zhijun Yan *, Pouneh Saffari, Kaiming Zhou, Adedotun Adebay, Lin Zhang Photonic Research Group, Aston

More information

Nd:YSO resonator array Transmission spectrum (a. u.) Supplementary Figure 1. An array of nano-beam resonators fabricated in Nd:YSO.

Nd:YSO resonator array Transmission spectrum (a. u.) Supplementary Figure 1. An array of nano-beam resonators fabricated in Nd:YSO. a Nd:YSO resonator array µm Transmission spectrum (a. u.) b 4 F3/2-4I9/2 25 2 5 5 875 88 λ(nm) 885 Supplementary Figure. An array of nano-beam resonators fabricated in Nd:YSO. (a) Scanning electron microscope

More information

Improving the efficiency of an optical parametric oscillator by tailoring the pump pulse shape

Improving the efficiency of an optical parametric oscillator by tailoring the pump pulse shape Improving the efficiency of an optical parametric oscillator by tailoring the pump pulse shape Zachary Sacks, 1,* Ofer Gayer, 2 Eran Tal, 1 and Ady Arie 2 1 Elbit Systems El Op, P.O. Box 1165, Rehovot

More information

Synchronization in Chaotic Vertical-Cavity Surface-Emitting Semiconductor Lasers

Synchronization in Chaotic Vertical-Cavity Surface-Emitting Semiconductor Lasers Synchronization in Chaotic Vertical-Cavity Surface-Emitting Semiconductor Lasers Natsuki Fujiwara and Junji Ohtsubo Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8561 Japan

More information

Generation of gigantic nanosecond pulses through Raman-Brillouin- Rayleigh cooperative process in single-mode optical fiber

Generation of gigantic nanosecond pulses through Raman-Brillouin- Rayleigh cooperative process in single-mode optical fiber Generation of gigantic nanosecond pulses through Raman-Brillouin- Rayleigh cooperative process in single-mode optical fiber Gautier Ravet a, Andrei A. Fotiadi a, b, Patrice Mégret a, Michel Blondel a a

More information

Optical phase-coherent link between an optical atomic clock. and 1550 nm mode-locked lasers

Optical phase-coherent link between an optical atomic clock. and 1550 nm mode-locked lasers Optical phase-coherent link between an optical atomic clock and 1550 nm mode-locked lasers Kevin W. Holman, David J. Jones, Steven T. Cundiff, and Jun Ye* JILA, National Institute of Standards and Technology

More information

Recent advances in coupled laser cavity design

Recent advances in coupled laser cavity design Invited Paper Recent advances in coupled laser cavity design James R. Leger a, Hung-Sheng Chiang a, Johan Nilsson b, Junhua Ji b,c, Sahu b a Department of Electrical and Computer Engineering, University

More information

Single-mode lasing in PT-symmetric microring resonators

Single-mode lasing in PT-symmetric microring resonators CREOL The College of Optics & Photonics Single-mode lasing in PT-symmetric microring resonators Matthias Heinrich 1, Hossein Hodaei 2, Mohammad-Ali Miri 2, Demetrios N. Christodoulides 2 & Mercedeh Khajavikhan

More information

Yb-doped Mode-locked fiber laser based on NLPR Yan YOU

Yb-doped Mode-locked fiber laser based on NLPR Yan YOU Yb-doped Mode-locked fiber laser based on NLPR 20120124 Yan YOU Mode locking method-nlpr Nonlinear polarization rotation(nlpr) : A power-dependent polarization change is converted into a power-dependent

More information

Temperature-Independent Torsion Sensor Based on Figure-of-Eight Fiber Loop Mirror

Temperature-Independent Torsion Sensor Based on Figure-of-Eight Fiber Loop Mirror (2013) Vol. 3, No. 1: 52 56 DOI: 10.1007/s13320-012-0082-3 Regular Temperature-Independent Torsion Sensor Based on Figure-of-Eight Fiber Loop Mirror Ricardo M. SILVA 1, António B. Lobo RIBEIRO 2, and Orlando

More information

Fiber lasers and their advanced optical technologies of Fujikura

Fiber lasers and their advanced optical technologies of Fujikura Fiber lasers and their advanced optical technologies of Fujikura Kuniharu Himeno 1 Fiber lasers have attracted much attention in recent years. Fujikura has compiled all of the optical technologies required

More information

Coupling effects of signal and pump beams in three-level saturable-gain media

Coupling effects of signal and pump beams in three-level saturable-gain media Mitnick et al. Vol. 15, No. 9/September 1998/J. Opt. Soc. Am. B 2433 Coupling effects of signal and pump beams in three-level saturable-gain media Yuri Mitnick, Moshe Horowitz, and Baruch Fischer Department

More information

Chapter 12: Optical Amplifiers: Erbium Doped Fiber Amplifiers (EDFAs)

Chapter 12: Optical Amplifiers: Erbium Doped Fiber Amplifiers (EDFAs) Chapter 12: Optical Amplifiers: Erbium Doped Fiber Amplifiers (EDFAs) Prof. Dr. Yaocheng SHI ( 时尧成 ) yaocheng@zju.edu.cn http://mypage.zju.edu.cn/yaocheng 1 Traditional Optical Communication System Loss

More information

Ph 77 ADVANCED PHYSICS LABORATORY ATOMIC AND OPTICAL PHYSICS

Ph 77 ADVANCED PHYSICS LABORATORY ATOMIC AND OPTICAL PHYSICS Ph 77 ADVANCED PHYSICS LABORATORY ATOMIC AND OPTICAL PHYSICS Diode Laser Characteristics I. BACKGROUND Beginning in the mid 1960 s, before the development of semiconductor diode lasers, physicists mostly

More information

Spatial Investigation of Transverse Mode Turn-On Dynamics in VCSELs

Spatial Investigation of Transverse Mode Turn-On Dynamics in VCSELs Spatial Investigation of Transverse Mode Turn-On Dynamics in VCSELs Safwat W.Z. Mahmoud Data transmission experiments with single-mode as well as multimode 85 nm VCSELs are carried out from a near-field

More information

Ratiometric Wavelength Monitor Based on Singlemode-Multimode-Singlemode Fiber Structure

Ratiometric Wavelength Monitor Based on Singlemode-Multimode-Singlemode Fiber Structure Dublin Institute of Technology ARROW@DIT Articles School of Electrical and Electronic Engineering 8-1-1 Ratiometric Wavelength Monitor Based on Singlemode-Multimode-Singlemode Fiber Structure Agus Hatta

More information

Improving the output beam quality of multimode laser resonators

Improving the output beam quality of multimode laser resonators Improving the output beam quality of multimode laser resonators Amiel A. Ishaaya, Vardit Eckhouse, Liran Shimshi, Nir Davidson and Asher A. Friesem Department of Physics of Complex Systems, Weizmann Institute

More information

Single-longitudinal mode laser structure based on a very narrow filtering technique

Single-longitudinal mode laser structure based on a very narrow filtering technique Single-longitudinal mode laser structure based on a very narrow filtering technique L. Rodríguez-Cobo, 1,* M. A. Quintela, 1 S. Rota-Rodrigo, 2 M. López-Amo 2 and J. M. López-Higuera 1 1 Photonics Engineering

More information

A Coherent White Paper May 15, 2018

A Coherent White Paper May 15, 2018 OPSL Advantages White Paper #3 Low Noise - No Mode Noise 1. Wavelength flexibility 2. Invariant beam properties 3. No mode noise ( green noise ) 4. Superior reliability - huge installed base The optically

More information

Mitigation of Self-Pulsing in High Power Pulsed Fiber Lasers

Mitigation of Self-Pulsing in High Power Pulsed Fiber Lasers Mitigation of Self-Pulsing in High Power Pulsed Fiber Lasers Yusuf Panbiharwala, Deepa Venkitesh, Balaji Srinivasan* Department of Electrical Engineering, Indian Institute of Technology Madras. *Email

More information