S Optical Networks Course Lecture 2: Essential Building Blocks
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1 S Optical Networks Course Lecture 2: Essential Building Blocks Edward Mutafungwa Communications Laboratory, Helsinki University of Technology, P. O. Box 2300, FIN TKK, Finland Tel: , edward.mutafungwa@tkk.fi
2 Lecture Highlights Optical sources/transmitters Photodetectors/receivers Optical amplifiers Passive devices Filters, splitters etc. March 2007 EMu/S /Lecture2_EnablingBlocks Slide 2 of 69
3 1. Introduction A fiber-optic communications link is composed of various essential building blocks Previous lecture focused mainly of the actual fiber transmission medium This lecture gentle overview of various optical devices To transport an information bearing signal (initially in electrical format) over fiber you need to: 1) convert signal to an optical signal before carrying it on fiber 2) convert optical signal to electrical format to retrieve the data March 2007 EMu/S /Lecture2_EnablingBlocks Slide 3 of 69
4 1. Introduction Information Sources Recovered Information Optical Source Modulator Transmitter Channel (Fiber) Electronic Signal Processing Photo-detection Optical Signal Processing Receiver March 2007 EMu/S /Lecture2_EnablingBlocks Slide 4 of 69
5 1. Introduction Operating wavelength range of optical devices must match that of fiber medium Several wavelength bands designated by ITU-T in the nm range E-band also known as S + -band and U-band also known as L + -band Multiwavelength operation is possible March 2007 EMu/S /Lecture2_EnablingBlocks Slide 5 of 69
6 2. Wavelength-Division Multiplexing Wavelength-division multiplexing or WDM Frequency-division multiplexing in the optical domain Multiple information-bearing optical signals transported on a single strand of fiber 6 Signals 6 x B bits/s... Fiber... B bits/s Multiplexer Demultiplexer B bits/s March 2007 EMu/S /Lecture2_EnablingBlocks Slide 6 of 69
7 2. Wavelength-Division Multiplexing Simple point-to-point link Fiber Optical to electrical converter Electrical repeater Electrical to Optical converter Fiber links O E E O New service demands and users, create need for extra link capacity. How do you quadruple the existing fiber capacity? March 2007 EMu/S /Lecture2_EnablingBlocks Slide 7 of 69
8 2. Wavelength-Division Multiplexing Fiber Optical to electrical converter Electrical repeater Electrical to Optical converter O E O E O E O E E O E O E O E O Space-division multiplexing fiber link with electrical regeneration O E O E O E O E E O E O E O E O WDM fiber link with electrical regeneration Optical amplifier WDM fiber link with optical amplification March 2007 EMu/S /Lecture2_EnablingBlocks Slide 8 of 69
9 2.1 Single Wavelength Systems Early optical communication systems Lack of optical amplification Single 850 nm or 1300 nm wavelength of operation Attenuation (db/km) First window 850-nm Standard fiber Second window 1300-nm λ (nm) Optical signal sources available Less loss and zero dispersion March 2007 EMu/S /Lecture2_EnablingBlocks Slide 9 of 69
10 2.2 WDM Systems Amplified optical communications systems Optical amplification enables WDM in 1550 nm window Less attenuation than 850 nm and 1300 nm windows Attenuation (db/km) First window 850-nm Standard fiber Second window 1300-nm Third window 1550-nm Low water-peak Fiber λ (nm) Optical signal sources Less loss and zero available dispersion Optical amplification, even lower loss March 2007 EMu/S /Lecture2_EnablingBlocks Slide 10 of 69
11 Two main types of WDM Dense WDM Coarse WDM 2.3 Types of WDM March 2007 EMu/S /Lecture2_EnablingBlocks Slide 11 of 69
12 2.3 Types of WDM Two main types of WDM: DWDM and CWDM Dense WDM (DWDM) ITU-T G grid with channel spacing 200 GHz or 1.6 nm 10s or 100s of channels in C- and L-bands ( nm) Figure: Excerpt of ITU-T G grid March 2007 EMu/S /Lecture2_EnablingBlocks Slide 12 of 69
13 2.3 Types of WDM Coarse WDM (CWDM) ITU-T G.694.2/695 grid with 2500 GHz or 20 nm channel spacing 18 channels spanning O-, E-, S-, C- and L-bands ( nm) Source: F. Audet, Understanding CWDM, EXFO application note. March 2007 EMu/S /Lecture2_EnablingBlocks Slide 13 of 69
14 2.3 Types of WDM DWDM enables many channels with amplification,...but requires stable transmitters and good filtering (sharp skirts and precise center frequency) CWDM simplifies filter and transmitter design (cheaper)...but no amplification and few channels enables Source: F. Audet, Understanding CWDM, EXFO application note. March 2007 EMu/S /Lecture2_EnablingBlocks Slide 14 of 69
15 3. Optical Signal Sources Two main sources: LEDs and lasers Light Emitting Diodes (LEDs) Cheap sources easy to fabricate and use Large spot size for coupling to multimode fibers (62.5 µm core) Suitable only for low rate applications and short distances Lasers Light amplification by stimulated emission of radiation Small concentrated spot size for coupling to singlemode fibers (8-9 µ m core) Enables longer distances and higher data rates Costly more complex and difficult to fabricate March 2007 EMu/S /Lecture2_EnablingBlocks Slide 15 of 69
16 3.1 Advantages of Lasers Lasers can be modulated (switched ON and OFF) at high speeds Speed rise or fall time taken to go from 10% to 90% of peak power Lasers achieve data rates in terms of Gbit/s LEDs limited to a few hundred Mbit/s March 2007 EMu/S /Lecture2_EnablingBlocks Slide 16 of 69
17 3.1 Advantages of Lasers Lasers are energy efficient LEDs light output linearly proportional to drive current (50 to 100 ma) Laser light output proportional to current above the threshold (5 to 40 ma) Figure: Relative amount of light output versus electrical drive current for (a) LEDs and (b) lasers March 2007 EMu/S /Lecture2_EnablingBlocks Slide 17 of 69
18 3.1 Advantages of Lasers Lasers have more suitable spectra Ideally all light emitted is at peak wavelength but In practice output at range of wavelengths around peak Wavelength range measured by spectral linewidth Usually represented by the full width half maximum (FWHM) To crosstalk in WDM systems (channel spacing FWHM) March 2007 EMu/S /Lecture2_EnablingBlocks Slide 18 of 69
19 3.1 Advantages of Lasers Lasers have narrower spectral linewidths than LEDs Laser oscillate simultaneously in several wavelengths or longitudinal modes Two laser types: Multiple-longitudinal mode (MLM) lasers and Single-longitudinal mode (SLM) lasers High side-mode suppression ratio in SLM lasers only main mode is prominent -10 to 0 dbm -10 to +5 dbm Power -25 to -15 dbm FWHM 30 to 100 nm Power FWHM 3 to 10 nm Power FWHM << 1 nm Wavelength LED spectrum Wavelength MLM laser spectrum Wavelength SLM laser spectrum March 2007 EMu/S /Lecture2_EnablingBlocks Slide 19 of 69
20 3.1 Advantages of Lasers Compact semiconductor lasers preferred for implementing transmitters in optical networks Unpackaged: ~ grain of salt, 0.5mm 200mm 100mm Packaged: ~ cm Figure: Array of about 1000 lasers grown on a wafer Figure: Packaged laser with a fiber pigtail March 2007 EMu/S /Lecture2_EnablingBlocks Slide 20 of 69
21 3.2 How do Lasers Produce Light? Converting an electrical to optical signal Electrical signal Data Source Electrical signal source Light source Optical signal Use stream of electrons to produce stream of photons March 2007 EMu/S /Lecture2_EnablingBlocks Slide 21 of 69
22 3.2 How do Lasers Produce Light? Physical systems (e.g. atoms, electrons, ions) found in one of a discrete number of energy levels Highest (excited state) and lowest (ground state) levels Energy difference between the two levels Band gap Figure: Energy level diagrams Energy B A N D G A P Excited state (High Energy) Ground state (Low Energy) March 2007 EMu/S /Lecture2_EnablingBlocks Slide 22 of 69
23 3.2 How do Lasers Produce Light? Electromagnetic fields induce transition between the different energy levels Three important optical transition processes will be discussed in some detail Absorption Spontaneous emission Stimulated emission March 2007 EMu/S /Lecture2_EnablingBlocks Slide 23 of 69
24 3.2 How do Lasers Produce Light? Absorption A photon with energy > (E2 E1) can be absorbed by electron in ground state The electron subsequently jumps to excited state photon photon absorbed Excited state E 2 Ground state E 1 March 2007 EMu/S /Lecture2_EnablingBlocks Slide 24 of 69
25 3.2 How do Lasers Produce Light? Spontaneous Emission: electron in excited state E 2 can spontaneously decay to state E 1 A photon with energy hf > (E 2 E 1 ) is emitted, where h = Js (Planck s constant) and f is frequency photon Excited state E 2 Ground state E 1 March 2007 EMu/S /Lecture2_EnablingBlocks Slide 25 of 69
26 3.2 How do Lasers Produce Light? Light produced by spontaneous emission is noisy Random propagation direction, phase and frequency Incoherent (broad spectral linewidth) The effect used to produce light in LEDs Excited state E 2 Ground state E 1 March 2007 EMu/S /Lecture2_EnablingBlocks Slide 26 of 69
27 3.2 How do Lasers Produce Light? Stimulated Emission A photon with energy > (E 2 E 1 ): triggers transition of an excited electron identical photon is emitted Produced light is coherent (desirable) photon Excited state E 2 Identical photon Ground state E 1 March 2007 EMu/S /Lecture2_EnablingBlocks Slide 27 of 69
28 3.2 How do Lasers Produce Light? Light amplification by stimulated emission is not strong, especially if the active region is short Facets (mirrors) provide feedback into active region N 2 Excited state E 2 N 1 Ground state E 1 along the laser March 2007 EMu/S /Lecture2_EnablingBlocks Slide 28 of 69
29 3.2 How do Lasers Produce Light? One facet is partially transmitting, to get output light waves with a resonant wavelength Rest is reflected back repeatedly and amplified N 2 Excited state E 2 N 1 Ground state E 1 along the laser March 2007 EMu/S /Lecture2_EnablingBlocks Slide 29 of 69
30 3.2 How do Lasers Produce Light? Lasing action produces light waves at periodic wavelengths Power spectral density Dominant mode Side modes Cavity mode Gain Curve λ Power spectral density Lasing spectrum λ E.g. Fabry-Perot (MLM) laser March 2007 EMu/S /Lecture2_EnablingBlocks Slide 30 of 69
31 3.2 How do Lasers Produce Light? Distributed feedback (DFB) lasers SLM laser Power spectral density Cavity modes λ Gain Curve DFB Gain Curve Power spectral density Lasing spectrum λ March 2007 EMu/S /Lecture2_EnablingBlocks Slide 31 of 69
32 3.3 Structure of Lasers Fabry-Perot Laser (overhead view) A type of an edge-emitting laser 1550 nm window lasers are usually edge-emitting lasers Wires (connection to current source) + Laser Active Region Light output - Heat Sink Cleaved facet (partial mirror) March 2007 EMu/S /Lecture2_EnablingBlocks Slide 32 of 69
33 3.3 Structure of Lasers Now increased interest in surface-emitting lasers Relatively easier packaging and testing Easily integrated as 2D array on substrate wafer Mostly used for 850 nm and 1300 nm transmitters in LANs Light output Surface-emitting laser 2D array of surface-emitting laser March 2007 EMu/S /Lecture2_EnablingBlocks Slide 33 of 69
34 3.4 Characteristics of Lasers The L-I curve: output light power vs. input current Below threshold current I th laser acts like an LED For I > I th, light power increases linearly with I Light output (power) Spontaneous emission region Stimulated emission region I th current March 2007 EMu/S /Lecture2_EnablingBlocks Slide 34 of 69
35 3.4 Characteristics of Lasers The information is encoded on semiconductor lasers by current modulation Light output (power) I Modulated Laser Light p I th Current modulation current March 2007 EMu/S /Lecture2_EnablingBlocks Slide 35 of 69
36 3.4 Characteristics of Lasers Lasers produce output at a range of wavelengths All lasers have non-zero spectral linewidths E 2 E 1 Due to distribution of E 2 and E 1 around mean values E Probability Probability Electron Population Distribution BANDGAP Gain A B C Lowest Energy Transition (A) Most Probable Energy Transition (B) wavelengths E Hole Population Distribution Highest Energy Transition, more likely to be absorbed (C) March 2007 EMu/S /Lecture2_EnablingBlocks Slide 36 of 69
37 3.4 Characteristics of Lasers Lasers have turn on delay between injection of current and generation of light Stimulated emission only begins when carrier density is sufficiently high Current Relaxation Oscillations t Light output (power) Turn on delay March 2007 EMu/S /Lecture2_EnablingBlocks Slide 37 of 69 t
38 3.4 Characteristics of Lasers Relative intensity noise (RIN) Wavelength fluctuations due to laser ageing or temperature changes Intensity fluctuations due to reflections from connectors and splices Spectral shape of RIN depends on laser driving current level Light output (power) 3 RIN Frequency Current March 2007 EMu/S /Lecture2_EnablingBlocks Slide 38 of 69
39 3.4 Characteristics of Lasers Chirping of the laser output signal (pulses) Instantaneous frequency fluctuations of output signal accompanying variation of drive current Leads to broadening of spectral linewidth March 2007 EMu/S /Lecture2_EnablingBlocks Slide 39 of 69
40 3.5 Other Laser Types and Applications Solid state, fiber and gas lasers Used in applications where high peak power and/or high continuous power is required Laser printers Semiconductor fabrication Laser light shows Laser drilling/cutting Medical surgery March 2007 EMu/S /Lecture2_EnablingBlocks Slide 40 of 69
41 4. Photodetector Convert an optical signal into an electrical signal Photodetectors made of semiconductor materials absorb incident photons and produces electrons If electric field imposed on photodector an electric current (photocurrent) is produced photodiode Photodetector Decision circuit data output Optical pulses Clock recovery Optical Receiver clock March 2007 EMu/S /Lecture2_EnablingBlocks Slide 41 of 69
42 4. Photodetector Basic requirements of a photodetector Sensitivity at the required wavelength Efficient conversion of photons to electrons Fast response to operate at high frequencies Low noise for reduced errors Sufficient area for efficient coupling to optical fiber High reliability Low cost March 2007 EMu/S /Lecture2_EnablingBlocks Slide 42 of 69
43 4.1 Types of Photodetectors Two main photodetectors used in optical communication systems pin photodiodes At best one electron generated when one photon absorbed Avalanche photodiodes The produced electron is induced a high electric field to knock off extra electrons avalanche multiplication More sensitive (can detect weaker signals) More noisier and requires higher bias voltage More sensitive to temperature and bias voltage variations Costlier March 2007 EMu/S /Lecture2_EnablingBlocks Slide 43 of 69
44 4.2 Characteristics of Photodetectors Quantum efficiency (η) probability that an incident photon will produce an electron η = electrons per second photons per second Responsivity, R (A/W), photocurrent produced per unit of incident optical power R = I p /P i = qη/hf with A/W I p = average photocurrent produced P i = incident optical power March 2007 EMu/S /Lecture2_EnablingBlocks Slide 44 of 69
45 4.2 Characteristics of Photodetectors Different semiconductor materials suit different wavelengths 850 nm (Si), 1300 nm (Ge) and 1550 nm (InGaAs) R (A/W) 100% quantum efficiency Si Ge InGaAs Wavelength (µm) March 2007 EMu/S /Lecture2_EnablingBlocks Slide 45 of 69
46 5. Optical Amplifiers Optical amplifiers share some similarities with electrical amplifiers Amplifier Gain = G Noise weak Input Signal Power = P G External power supply Output Signal Power = G P March 2007 EMu/S /Lecture2_EnablingBlocks Slide 46 of 69
47 5. Optical Amplifiers Similarities between optical and electrical amplifiers: Signal amplification Noise added to amplified signal Gain and noise can be measured and calculated Difference between optical and electrical amplifiers: Large gain bandwidth 3 THz 25 THz (optical) 2 GHz 50 GHz (electrical) March 2007 EMu/S /Lecture2_EnablingBlocks Slide 47 of 69
48 5.1 How do Amplifiers Work? Signal photon enters the amplifier It stimulates an ions to decay to ground state, which emits an identical photon This repeats and the signal is amplified (Gain) Population N e Excited state Population N g Ground state along the amplifier March 2007 EMu/S /Lecture2_EnablingBlocks Slide 48 of 69
49 5.1 How do Amplifiers Work? Ions can decay to ground spontaneously Photons emitted, random orientation, phase and λ Spontaneous Emission Population N e Excited state Population N g Ground state along the amplifier March 2007 EMu/S /Lecture2_EnablingBlocks Slide 49 of 69
50 5.1 How do Amplifiers Work? A signal entering an optical amplifier will emerge amplified and is accompanied by amplified spontaneous emission (ASE) noise. N e Amplified Signal Signal N g along the amplifier + ASE Noise March 2007 EMu/S /Lecture2_EnablingBlocks Slide 50 of 69
51 5.2 Optical Amplifier Performance Optical amplifier gain G db = P signal_out 10 log 10 db P signal_in Ratio of signal power at amplifier output to signal power at amplifier input Expressed in decibels (db) March 2007 EMu/S /Lecture2_EnablingBlocks Slide 51 of 69
52 5.2 Optical Amplifier Performance An optical amplifier will produce ASE noise P Signal P Signal W ASE λ Optical Amplifier ASE λ W ASE = ASE noise Power Spectral Density (PSD) W ASE is approximately flat P ASE Signal λ March 2007 EMu/S /Lecture2_EnablingBlocks Slide 52 of 69
53 5.2 Optical Amplifier Performance ASE noise is usually reduced by optical filtering P Signal λ Optical Amplifier P ASE Signal λ Optical Filter P Signal λ Average Noise Power P ASE : P ASE = W ASE B 0 B 0 is the optical filter bandwidth March 2007 EMu/S /Lecture2_EnablingBlocks Slide 53 of 69
54 5.3 Types of Optical Amplifiers Erbium doped fiber amplifier (EDFA) most popular amplifier Pump lasers output (980 or 1480 nm) coupled into the doped silica fiber forcing erbium (Er 3+ ) ions into exited state Optical data bearing signals traverses doped fiber and stimulates Er 3+ ions to ground state amplification Amplifies (G 20 db) multiple data signals in C-band Also amplifies L- band with some modifications March 2007 EMu/S /Lecture2_EnablingBlocks Slide 54 of 69
55 5.3 Types of Optical Amplifiers Raman fiber amplifiers (RFA) Data signal amplified when in the transmission fiber itself Employs a fiber nonlinear effect to transfer power from high-power pump signal to data signals Can be tailored to provide gain in all wavelengths using multiple pumps In practice used to complement EDFAs EDFA Data signal EDFA Fiber Pump signal Pump Amplifier Site Amplifier Site March 2007 EMu/S /Lecture2_EnablingBlocks Slide 55 of 69
56 5.3 Types of Optical Amplifiers Semiconductor optical amplifiers (SOAs) Like a semiconductor laser without mirrors Advantages Amplification bandwidths 30 to 100 nm Can be integrated with other devices Disadvantages Introduces crosstalk in WDM systems reduced by gain clamping Higher input coupling losses noise power more dominant Used to construct other devices e.g. optical switches, wavelength converters March 2007 EMu/S /Lecture2_EnablingBlocks Slide 56 of 69
57 5.3 Types of Optical Amplifiers Various amplifies proposed for different bands Source: D. Blumenthal, ECE228B lecture slides, USCB. March 2007 EMu/S /Lecture2_EnablingBlocks Slide 57 of 69
58 6. Optical Passive Devices Active devices Devices which require power of some sort to function e.g. optical amplifiers require electricity for pump lasers Could also comprise processors, memory chips or other devices which are active Passive devices Devices that merely pass or restrict light Do not require powering reduced cost and maintenance requirements Passive devices may become active if tunability is required March 2007 EMu/S /Lecture2_EnablingBlocks Slide 58 of 69
59 5.1 Optical Filters Optical filters have many uses in optical networks Implementing multiplexers and demultiplexers in WDM systems ASE noise filtering in links with optical amplification Gain equalization of optical amplifiers Spectral shaping or slicing of broad spectral linewidth optical sources March 2007 EMu/S /Lecture2_EnablingBlocks Slide 59 of 69
60 5.1 Optical Filters Passband skirts Crosstalk energy Important spectral-shape parameters of optical filters March 2007 EMu/S /Lecture2_EnablingBlocks Slide 60 of 69
61 5.1 Optical Filters Fabry-Poret filters Has cavity formed by two partially reflective mirrors Input enters 1st mirror and resonant wavelengths add in phase and leaves through 2nd mirror Resonant wavelengths depends on cavity length L (tunable) Filter bandwidth depends on mirror reflectivity R March 2007 EMu/S /Lecture2_EnablingBlocks Slide 61 of 69
62 5.1 Optical Filters Multilayer Dielectric thin film filters Similar operation principle to Fabry-Perot filters Multiple cavities realized by multiple reflective dielectric thin-film layers The more the cavities the flatter the passband top and sharper the skirts March 2007 EMu/S /Lecture2_EnablingBlocks Slide 62 of 69
63 Fiber Bragg gratings 5.1 Optical Filters March 2007 EMu/S /Lecture2_EnablingBlocks Slide 63 of 69
64 5.2 Couplers, Splitters and Combiners Directional (2 2) couplers If input signal power distributed equally 3dB coupler Useful for combining and coupling signals e.g. in optical amplifiers Also used for tapping off signal portions e.g. 5/95 tap coupler with 5% tap ratio Input 1 Output 1 Input 2 Output 2 Fiber or waveguide March 2007 EMu/S /Lecture2_EnablingBlocks Slide 64 of 69
65 5.2 Couplers, Splitters and Combiners Passive star couplers, combiners and splitters Constructed by interconnecting multiple 3dB couplers For signal broadcast or multicast Input 1 Output 1 Input 2 Input 3 Input 4 Input 1 Input 2 Input 3 Output 2 Output 3 Output 4 Example 4 4 star coupler Input 4 Example 4 1 combiner Output Input Output 1 Output 2 Output 3 Output 4 Example 1 4 splitter March 2007 EMu/S /Lecture2_EnablingBlocks Slide 65 of 69
66 5.3 Optical Isolators and Circulators Isolator allow transmission only in one direction Prevent reflections back into lasers, amplifiers etc. Circulators isolators with multiple ports Low insertion loss High isolation 3 3 Isolator 3 port circulator 4 port circulator March 2007 EMu/S /Lecture2_EnablingBlocks Slide 66 of 69
67 5.4 Attenuator Attenuator restricts transmission in both directions High insertion loss High isolation Attenuator March 2007 EMu/S /Lecture2_EnablingBlocks Slide 67 of 69
68 6. Conclusions Optical sources Lasers very essential Mechanisms, structure and characteristics Receivers Photodiodes mechanisms and characteristics Optical amplification EDFAs, RFA and semiconductor amplifiers Passive devices Various filters types Passive splitters/combiners, ssolators, circulators etc. Next lecture optical modulation and demodulation March 2007 EMu/S /Lecture2_EnablingBlocks Slide 68 of 69
69 Thank You!? March 2007 EMu/S /Lecture2_EnablingBlocks Slide 69 of 69
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