RSOA BASED 10G WDM FOR LONG REACH PON USING MANCHESTER CODING FOR REMODULATION.

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1 RSOA BASED 10G WDM FOR LONG REACH PON USING MANCHESTER CODING FOR REMODULATION. S RAJALAKSHMI SENSE, VIT University, Vellore, Tamil Nadu , India srajalakshmi@vit.ac.in ANKIT SRIVASTAVA ECE, VIT University, Vellore, Tamil Nadu , India ankitrian@gmail.com ASHISH PANDEY ECE, VIT University, Vellore, Tamil Nadu , India ashishanj@mail.com Abstract : We have designed and analyze the effects using Manchester format for the downstream signal on the performance of upstream transmission using a RSOA based WDM PON system. WDM PON is a current technology for next generation passive optical networks. The simulation setup is made using different sources and receivers for WDM PON. The performance is done using Manchester modulation technique for 100km using 2.5Gbps data rate upstream transmission. The design network is analyzed using BER, Q-factor and Eye Pattern. The results prove the significance that these systems can be used for high speed broadband services to subscribers. The results have also confirmed that when down stream signal is re-modulated for upstream transmission; the power budget and scalability could be achieved. Keywords: Wavelength Division Multiplexing( WDM), Dense Wavelength Division Multiplexing(DWDM), Passive Optical Networks (PON), Central Office (CO, )Optical Line Terminal (OLT), Optical Networks Unit (ONU), Light Amplification by Stimulated Emission of Radiation (LASER, DM(Direct Modulated) laser, FP(Fabry Perot) laser), Bit Error Rate(BER), PIN and Avalanche Photodetectors(APD), Reflective Semiconductor Optical Amplifier(RSOA). 1. Introduction FTTH is an innovative technology which is upcoming for next generation fibre access networks. Passive Optical Networks are presently now enormous developing to implement FTTH. The recent PON candidates are ATM, Ethernet and WDM. WDM PON requires only passive components, active components are not required, and therefore heat and power issues are not considered. Network requires fewer components; therefore maintenance cost is also less. Nowadays WDM PON plays a critical role for multiservice and multicasting because of increased bandwidth facility. To support multiservice WDM and DWDM are implemented through a single mode fibre. They provide services to deliver data, voice and video. To fulfil all these future demands the requirements are done by passive optical networks using high bandwidth, increased reach, increasing subscriber density, greater flexibility, and security. Additionally, those demands which is being offered provides symmetric bandwidths, in both upstream (user end to the exchange) & downstream (exchange to user end). PON provides multiservice up to 10Gbps to end users.[4] The PON delivers the service by means of different multiplexing Schemes, such as TDM,WDM and Hybrid TDM/WDM[5-6]. An intensive research has been undergoing in WDM-PONs for different applications by using of different sources in the CO and receivers at the Optical Network Unit (OLT). More recently the deployment of several WDM PON architectures have raised feasibility of using Manchester coding techniques due to potential ISSN : Vol. 4 No.04 April

2 improvements in the data carrying capability and system reach. This research work carried and examined the feasibility of using efficient sources for remodulation in the receivers at the ONT, for upstream transmission in a WDM-PON. The rest of the paper is organized as follows. A brief overview of sources and receivers in section II. The current RSOA based WDM PON technologies and research challenges are given in section III. The simulation methodologies and parameters assigned are outlined in section IV. This is followed by Section V which explains results and discussion and section VI shows the evaluation of the PON Networks showing various eye diagrams and graphs for comparison. Section VII concludes the paper. 2. Sources and Photo Receivers Overview Receivers basically converts optical signal into an electrical signal. Photo receivers convert the electrical signal proportional to an optical signal. Electrical signal is linearly proportional to an optical signal. The Photodetectors operate in the wavelength of 1.3µm and 1.55µm. Two types of receivers are available; PIN and APD receivers PIN Receivers: The simple semiconductor photodetector is the PIN photodiode. The device structure consists of 'p' and 'n' region separated by a very lightly doped intrinsic material. It works in reverse bias. The detector is designed to operate in the wavelength region of nm APD Receiver: APD has very high sensitivity and responsivity when compared with PIN because of the phenomenon called avalanche effect in its intrinsic region to create an electrical gain. InGaAs will be used for detecting the wavelength of up to 1.55µm. The commonly used structure is reach-through construction known as RAPD. 3. Optical Access Networks Passive optical networks (PONs) were developed during the year 1980 s. PON are receiving interest since it is a cheapest way to implement. It is used as a cost effective method for sharing fiber infrastructure to business premises, curb, and home etc. The PON architectures use the passive components, which potentially reduces the cost and maintenance since it is point to multi-point transport network. Using optoelectronics PONs are characterized to have low power consumption, except laser amplifiers and photoreceivers. PON has several advantages such as fiber data rates up to 10Gbits, and passive power splitters which can be installed anywhere. Using upstream and downstream the PON is served bi-directionally [7]. Research is going on for carrying multiple applications and data rates thro long/extended reach [9]. PONs provides cost effective solutions [10]. GPON has found to improve bandwidth factor by four through maintenance and security issues [11]. There are several architectures of PON using different modulation schemes like TDM, WDM and hybrid using both TDM/WDM. Reflective Semiconductor Optical Amplifiers (RSOA) is used to demonstrate the upstream signal transmission for a Direct Modulated laser and a Fabry Perot Laser. The Input power to the RSOA is varied and the signal strength as well as BER values is computed at the upstream as well as downstream receiver. The coding Technique used is Manchester coding Technique RSOA WDM PON Using Direct Modulated Laser WDM PONs has been widely researched as a potential technology. This PON uses multiple wavelengths in a single fiber to multiply the capacity without increasing the data rate. Typically a TDM PON uses a single wavelength whereas a WDM PON uses many wavelengths. A TDM PON provides more channels but moderate bandwidth. As a consequence both solutions have merit and thus both methods need evaluation. PON has been researched for over 10 years and many architectures have been proposed, through which WDM PON increases the broadband access capacity [12-13]. In a generic PON architecture a SMF fiber connects a Central Office to a distribution center which contains passive splitters or/and Multiplexers and Demultiplexer. PON operate at distances beyond 20 km and provide data rates in the order of Gbits/sec due to its end to end fiber infrastructure. Minimizing the active components in PONs provides cost advantage since power and maintenance are one of the major cost factors for the local exchange carrier. Fig.1 represents WDM PON architecture. The OLT housed in CO has a set of fixed or tunable laser source to send downstream traffic to ONU. Each user has been assigned a fixed frequency at which the laser operates. ISSN : Vol. 4 No.04 April

3 The frequency allotment can be permanent or it can be according to the bandwidth demand. The data is then given to a multiplexer which combines all the data together and sends it through the optical fiber of lengths varying from 20km to 100km. The optical fiber terminates on a passive WDM Demultiplexer that separates light according to the wavelength and then transmits it to the corresponding ONU. The ONU is again an optoelectronic component and converts the light signal to electrical signal and the data is retrieved. Fig. 1. WDM PON Model 3.2. RSOA Based WDM PON Using FP Laser. DWDM stands for "Dense Wavelength Division Multiplexing". Signals multiplexed in the wavelength range of 1550nm using EDFA. EDFAs operate between 'C' band nm and 'L' band nm. In DWDM wavelength are positioned between 100GHz (0.8 nm). Nowadays DWDM systems use 160 channels for operation using lesser channel spacing of 50GHz or even 25GHz. The DWDM PON architecture remains the same as that of WDM PON except the channel spacing. 4. Simulation Methodology The simulation is done in Optisystem version 7 of OptiWave Corporation. To compare the performance of the network we have analyzed BER performance, fiber length and different data rates. The PON network simulated supports 2 users with the objective to determine the Q factor and min BER achievable at different data rates and different fiber lengths. Then comparing the min BER with the different SMF lengths 4.1. RSOA BLOCK DIAGRAM We implement a directional WDM PON using RSOA and evaluated the effects of using Manchester format for the downstream signal on the performance of upstream signal.fig2 and Fig 3 shows the experimental setup. For the down stream transmission we use the Direct Modulated Laser and Fabry Perot Laser in the operating wavelength of 1550nm and 1555nm in the central office, with the average output power of 10dBm. We modulate these lasers at 2.5Gbps using Manchester code. At the RN the downstream signal was demutiplexed using Demux and send to the ONU. At the ONU we split the signal into two parts using a variable ratio fibre coupler. We adjusted the coupling ratio for each modulation format to provide sufficient powers into both the downstream receivers and RSOA. A PIN and APD receivers were separately used to detect the downstream signal. ISSN : Vol. 4 No.04 April

4 4.2. Direct Modulated RSOA Simulation The design is simplified form of CO and ONU connected through a 100km optical fiber. The optical filters model the filtering effects of AWG in an actual PON network. At CO, the downstream transmitter generates 1550nm signal, 2.5Gbps Manchester signal. The ONU routes the downstream signal to both the receiver and RSOA based upstream transmitter. A 2.5Gbps Manchester coding modulates the RSOA, effectively, overwriting the downstream signal. The transmitter then sends the upstream signal through the same 100km of fiber to the receiver of the CO. Optsim simulates the entire bidirectional design in two passes, first the downstream transmission and then the upstream transmission. The effectiveness depends upon the ability of RSOA to remodulate the downstream signal with the new upstream signal. Towards this end the high pass filtering of the RSOA, which is more pronounced at higher inputs power, helps to suppress the downstream signal. As the input power in RSOA is increased, the RSOA does a better job of eliminating any modulation on this input and superimposing the modulation of the RSOA control current. Table 1 and 2 lists majorly used network components for simulation of DM RSOA WDM PON along with the values assigned to the parameter. Table 1. The parameters for WDM PON Network Components Parameters Fig. 2. DM LASER RSOA Simulation set up Type Value PRBS generator Bit Rate 1-5Gbps Light source Wavelength nm Modulator Modulation format MANCHESTER WDM MUX Insertion loss 0dB Filter type Bessel Filter order 2 Optical fiber Fiber length km Photodetector Responsivity 1A/W Dark current 10nA Layout parameters Sequence length 128bits ISSN : Vol. 4 No.04 April

5 4.3. FP LASER RSOA WDM PON Simulation Fabry Perot lasers are suited for high performance links. The output from laser is modulated using external Manchester modulator and fed to the Mux. Optical filters modulate the effects of AWG in an actual PON network. In the CO, the transmitter generates a 1550nm 10Gbps Manchester signal. The ONU routes the downstream signal to both a downstream receiver and a RSOA based upstream transmitter. A 10Gbps Manchester signal modulates the RSOA, effectively overwriting the downstream signal. The transmitter then sends the new upstream signal back over the same 100km fiber, then simultaneously accounting for both upstream and downstream. The effectiveness of this design depends on the ability of the RSOA to remodulate the received downstream signal with the new upstream signal. Towards the end, the high pass filtering effect of the RSOA, which becomes more pronounced at higher input power, helps to suppress the downstream signal. As the power of the optical signal at the RSOA input is increased, the RSOA does a better job of eliminating any modulation on this input and superimposing the modulation of the RSOA control current. Table 1 and 2 list majorly used network components for simulation of RSOA Fabry Perot WDM PON along with the values assigned to the parameter. Table 2. The parameters for RSOA WDMPON network. Fig. 3. FABRY PEROT LASER RSOA Simulation Set Up Wavelength Components Parameters Value nm Laser Power 10dBm DOWN RSOA Power UPSTREAM Receiver Power -10dBm,-20dBm -23dBm Downstream Receiver power -21dBm ISSN : Vol. 4 No.04 April

6 5. Results and Discussions The performance analysis is done using the BER and eye diagram. The research work has been focused between the PIN and APD photo receivers which are exclusively used for WDM for system reach and data carrying capabilities. The Eye Pattern technique is used for assessing the data handling capabilities and evaluating the performance of an optical system. The width of the eye opening defines the time interval over which the received signal can be sampled without error from inter symbol interference. PIN The BER values computed as measured in the simulation environment all corresponds to the mean values. The data rates used are 1, 2.5 and 4Gbps. Single mode fibers used shows us that there are no inter-modal attenuation in it as compared to multimode fibers which signify longer length of transmission due to less attenuation and signal remains stronger for a considerable length. Table 3 compares the values of PIN and APD for WDM PON network using Manchester coding. It shows that APD receivers have better BER and Q factor. Table 4 compares the values of PIN and APD for DWDM PON network using Manchester coding. It shows that APD receivers have better BER and Q factor. It has been proved that Manchester coding provides better results. Table 3. Analysis of DM LASER RSOAWDM PON Network Comparison of Receivers Analysis Average Power - Average 10dBm Power -20dBm PIN APD PIN APD UPSTREAM 1 (1550nm) UPSTREAM 2 (1555nm) DOWNSTREAM1 (1550nm) DOWNSTREAM2 (1555nm) e e e e e e e e e e e e e e e e-20 Table 4. Analysis of FP LASER RSOAWDM PON Network Comparison of Receivers Analysis Average Power - 10dBm Average Power - 20dBm PIN APD PIN APD UPSTREAM 1 (1550nm) UPSTREAM 2 (1555nm) DOWNSTREAM1 (1550nm) DOWNSTREAM2 (1555nm) e e e e e e e e e e e e e e e e-9 This analysis is done for the comparison of performance between PIN and APD photodiodes for both the WDM and DWDM networks and the results are provided in the form of tabular column and listing the improvements provided by APDs in simulated network in terms of system reach and data carrying capabilities. ISSN : Vol. 4 No.04 April

7 6. Evaluation of Performance Through EYE Diagrams Fig 4. Eye diagrams for downstream: using PIN receiver at 2. 5 Gbps Fig. 5. Eye diagrams for downstream:for APD receivers at 2. 5 Gbps. Fig. 6. Comparision between PIN and APD for WDM: downstream 10Gbps 2.5Gbps. ISSN : Vol. 4 No.04 April

8 Fig. 7. Comparision between PIN and APD for DWDM: downstream 10Gbps 2.5Gbps. Fig. 8. Comparison between PIN and APD for WDM for different SMF lengths at 10Gbps 2.5 Gbps Fig. 9. Comparison between PIN and APD for DWDM for different SMF lengths at 10Gbps 2.5 Gbps ISSN : Vol. 4 No.04 April

9 7. Conclusions: Here we can see that at higher distance the BER value is significantly less in PIN receiver as compared to that of APD receiver. As we increase the distance further we observe at 150 Km the BER value for PIN is even less than the minimum required BER value. But at distances less than 60km range there is not much difference between PIN and APD BER values. Hence we can conclude that for 2.5Gbps data rate and for long distance data transmission APD receiver is much reliable and gives better performance than that of PIN photo receiver. References [1] U. Ibrahim, Hassan Abbas, Raja faizan, S. F. Shaukat,[2010] Performance Evaluation of PhotoReceivers in WDM Passive Optical Networks.. [2] J. H. Lee, et al.,[2010] First Commercial Deployment of a Colorless Terminator, J. Lightwave Technol. 28, [3] C.Michie, A.E.Kely, J. McGeough, S.karagiannopopulos, and I. Andonovis,[2009] optically amplified passive optical networks: A power budget analysis, J.opt. Netw.8, [4] H.Song, B.W.Kim, and B.Mukherjee,,[2009] Long- Reach Optical Access Networks: A survey of research Challenges, Demonstrations, and bandwidth, Assignment Mechanisms, IEEE Comunications Survey and Tutorials, accepted. [5] K.Tanaka, A Agatan, and Y. Horiuchi,[2010] IEEE 802.3av 10G-EPON standardization and its Research and Development Status, J.lightwave Tech. 28, [6] S. H. Cho, S. S. Lee, D. W. Shin, [2010] Improving upstream transmission performance using a receiver with decision threshold level adjustment in a loopback WDM-PON, Optical Fiber Technology, Volume 16, Issues 3. [7] A. Sierra and S. V. Kartalopoulos, [2006] Evaluation of two prevalent EPON networks using simulation methods, in Proceedings of the Advanced International Conference on Telecommunications and International Conference on Internet and Web Applications and Services. [8] U. Ibrahim, S. Nazir, S F Shaukat, M. I. Shehzad, and M. Faisal, Monte Carlo Analysis of Broadband Passive Optical Networks, unpublished Jingjing Zhang and Nirwan Ansari, New Jersey Institute of Technology Yuanqiu Luo, Frank Effenberger, and Fei Ye, [9] J.D. Dwnie, A.B. Ruffin, and J. Hurley,[2009] Ultra low loss optical fiber enabling purely passive 10 Gbits PON system with 100 km length, opt Express 17, [10] P.Chanclou, et al.,[2008] Access network evolution: optical fiber to the subscribers and impact on the metropolitan and home networks, Computes Rendus Physique, volume 9, Issues [11] R.Baca and M.Zuhdi,[2008] Technological Challenges to G-PoN operation, in National fiber Optic Engineers Confernce, OSA Technical Digist(CD) Optical society of America. [12] G.K Chang, et al.,[2009] Key technologies of WDM-PON, for furure Converged Optical Braod band access Netwowrks[Invited], J.Opt.Commu. Netw.1, C35-C50 [13] J.Zhang, N, Ansari,[2009] On analyzing the capacity of WDM PONs, Proc IEEE GLOBECOM [14] Nortel,[2009] Position Paper, Ethernet over WDM PON Technology overview. [15] ISSN : Vol. 4 No.04 April

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