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Ph. D. Thesis Proposal Presentation

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Information about Ph. D. Thesis Proposal Presentation
Technology

Published on February 12, 2009

Author: jmfabrega

Source: slideshare.net

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UPC-GCO UPC- GCO Homodyne OLT-ONU design for access optical networks Universitat Politècnica de Catalunya Advisor: Advisor: Josep Prat Student: Student: Josep Mª Fàbrega Mª Universitat Politècnica de Catalunya (UPC) Dept. of Signal Theory and Communications (TSC) Optical Communications Group (GCO) www.tsc.upc.edu/gco

UPC Thesis proposal GCO Introduction ∙ Homodyne systems in access networks State of the art ∙ What we have done Thesis index Work plan Publications and dissemination

UPC Introduction GCO Migration from TDM/WDM to pure WDM [1] Ultra-dense WDM PONs ∙ Multiple low capacity channels E.g. 1 Gbps OL 3 GHz ........................... λ More than 1500 ch. at C band

UPC Introduction GCO ∙ IM-DD systems limited Sensitivity Optical filters selectivity ∙ Coherent systems Heterodyne Optical I p(t) - Input – Image frequency problems + Homodyne Local – Phase locking problems [2] Laser

UPC Network Schemes GCO 2) with MUX & splitters[D8]: 1) with splitters CPE CPE CPE nd DM ba CPE λ1 D-W CPE CPE CPE K CPEs CPE λ1 .. λN D-WDM bands OLT CO CPE λ CPE CPE D- N W Nx PONs DM CPE CO CPE ba nd D-WDM CPE CPE MUX CPE (RN 1) CPE D-WDM band CPE CPE power splitter CPE (RN 2) 3) SARDANA [3]: K UD-WDM channels down-signals 1 wavelength 1 user CO RN16 RN1 up-signals Long reach (>100 km) Add/Drop Pump 100 km Ring WDM WDM Pump Pump Large number of users λ i2 λ i1 (>1500 @ 1 Gbps) rEDFs rEDFs ONU ON ONU ON 1:32 1:32 RN i No TDM bandwidth ONU ON ONU ON RN x up sharing K UD-WDM channels

UPC OLT and ONU philosophy GCO OLT Tx/Rx and ONU are intended to have the same architectures PSK main modulation format for both upstream and downstream Other modulation formats can be envisaged (PSK/IM, QAM/QAM) Main impairments ∙ Laser phase noise ∙ Polarization fluctuations

UPC Thesis proposal GCO Introduction ∙ Homodyne systems in access networks State of the art ∙ What we have done Thesis index Work plan Publications and dissemination

UPC ONU Schemes GCO Optical Phase-Locked Loop Phase/Polarization diversity Phase/Polarization scrambling

UPC ONU Schemes: oPLL ONU GCO - Optical In/Out Data out PM or IM + Modulator Hold-In Margin for several loops 9 8 7 Hold-In margin (GHz) Phase 6 Local 5 control and Laser 4 recovery 3 2 Linewidth tolerance for several loops 1 0 30 Heterodyne Balanced Costas SC-PLL Phase error deviation (degrees) 27 Balanced Costas Several oPLL architectures to study 24 Costas Loop [4] ∙ 21 Decision Driven [5] ∙ 18 Heterodyne Balanced [6] ∙ 15 Lock-In amplifier (heterodyne) [7] ∙ 12 SubCarrier Modulated [8] ∙ BER-floor 9 6 10-9 BER ∙ 10º SCM SubCarrier Modulated 10-3 BER ∙ 28º Lock-In 3 Hold-In margin 0 0 1 2 3 4 5 6 7 ∙ SCM: 7.68 GHz Total laser linewidth (MHz) ∙ Lock-In: 896 MHz

UPC ONU Schemes: 90º Hybrid ONU GCO Low cost if implemented with polymeric waveguides Polarization insensitive when combined with PBS Possible use of advanced and non-linear signal processing techniques to improve data detection [9] Total laser linewidth per symbol rate ratio tolerance up to 3.2% using linear phase estimation [10] 90º Hybrid I Optical In /Out Data Out I and Q ADC Post-processing PM or AM Q Modulator Data Local Wavelength control laser

UPC ONU schemes: Phase Scrambling ONU GCO Optical In/Out Data out - I and Q Post-processing PM or IM + Modulator Phase Scrambler Sensitivity penalty vs channel spacing CLK 3,5 Recovery 3 Sensitivity penalty (dB ) 2,5 2 1,5 1 Local 0,5 0 Laser I Q I Q 0 1 2 3 4 5 6 7 Channel spacing (GHz) t t0 t0+T/2 t0+T t0+3T/2 t0+2T Sensitivity measurements Very simple optics -2 Total laser linewidth per symbol rate ratio -3 Downstream tolerance up to 18% -4 Upstream <3GHz ch. spacing at 1 Gbps (<1.5 dB penalty) -5 log(BER) -38.7 dBm sensitivity @ 10-9 BER -6 ~3 dB penalty due to phase scrambling -7 Idea and first experiments [D2, D4, D9, D12] -8 Digital Signal Processing version based in -9 Fuzzy logic data estimation [D3] -10 Version with both, polarization and phase -48 -46 -44 -42 -40 -38 -36 scrambling Input power (dBm)

UPC ONU schemes: Phase Scrambling ONU GCO Data out Optical In /Out - I and Q Post-processing PM or IM + Modulator CLK BER-floor vs laser linewidth -1 Recovery γ =1 -2 Local log(BER) -3 Laser Square wave γ= -4 -5 1 2 3 4 5 6 7 8 9 10 Linewidth/bitrate (%) 127º Sensitivity results 0 -1 Low cost homodyne receiver -2 Very simple optics -3 log(BER) -4 Total laser linewidth per symbol rate ratio γ =1 tolerance up to 3.2% -5 -6 ~3 dB penalty due to phase scrambling Square wave -7 Sensitivity expected -36 dBm @ 10-9 BER -8 γ= Idea and first results [D4] -9 -10 -43 -42 -41 -40 -39 -38 -37 -36 -35 Received Power (dBm)

UPC OLT Scheme GCO Transceivers scheme same as ONU Polarization scrambling can be done at OLT Bidirectional K Tx/Rx Polarization Scrambler Tx/Rx At the OLT ∙ Phase scrambling is done at I Q Q I Q Q I I Tx/Rx ∙ Polarization scrambling is done H H V V H V H V after coupling transceiver outputs t t+T t+2T At the ONU ∙ Only phase scrambling

UPC Thesis proposal GCO Introduction ∙ Homodyne systems in access networks State of the art ∙ What we have done Thesis index Work plan Publications and dissemination

UPC Thesis index GCO Executive summary Introduction ∙ Background ∙ Scope of work ∙ Document organization Network topologies ∙ Tree topologies ∙ Ring topologies OLT and ONU architectures ∙ Lock-In amplifier oPLL architecture ∙ Phase / polarization diversity architectures i. Full phase / polarization diversity – 1. K-L phase estimation – 2. Fuzzy data estimation ii. Time switched phase / polarization diversity – 1. Differential detection – 2. K-L phase estimation – 3. Fuzzy data estimation c. Performance summary Cost analysis and comparison Conclusions and future lines Publications References Appendixes

UPC Thesis proposal GCO Introduction ∙ Homodyne systems in access networks State of the art ∙ What we have done Thesis index Work plan Publications and dissemination

UPC Work Plan GCO Research period ∙ Reach a complete knoweldege on: Signal processing Network topologies Tx/Rx architectures ∙ Propose improvements/original techniques Evaluation of the architectures ∙ Simulations ∙ Proof-of-concept experiments. Prototype implementation ∙ Prototype assembled in some PON testbeds ∙ Arrange stays outside UPC (perform late experiments) Redaction of the thesis

UPC Work Plan GCO jan feb mar apr may jun jul aug sep oct nov dec 2006 2007 2008 2009 Research period (19 months) Evaluation of the architectures (12 months) Prototype implementation (6 months) Redaction of the thesis (6 months)

UPC Thesis proposal GCO Introduction ∙ Homodyne systems in access networks State of the art ∙ What we have done Thesis index Work plan Publications and dissemination

UPC Publications and dissemination GCO 2 patents 3 journal articles 11 conference contributions (6 ECOC, 1 OFC, and others) PATENTS [D1] Josep Prat, Josep M. Fàbrega “Receptor homodino para comunicaciones ópticas con procesado a posteriori,” P-200700041, priority date: 29/12/2006 [D2] Josep Prat, Josep M. Fàbrega, Joan M. Gené “Receptor coherente homodino para comunicaciones ópticas con demodulación diferencial,” P- 200500998, priority date: 21/04/2005 JOURNAL ARTICLES J. M. Fàbrega, J. Prat, “Experimental Investigation of Channel Crosstalk in a Time-Switched Phase Diversity Optical Homodyne Receiver,” OSA [D3] Optics Letters, vol. 34, No. 4, February 2009 J. M. Fàbrega, J. Prat, “Homodyne receiver prototype with time-switching phase diversity and feedforward analog processing,” OSA Optics [D4] Letters, vol. 32, No. 5, March 2007 J. M. Fàbrega, J. Prat, “Fuzzy Logic Data Estimation Based PSK Receiver with Time-switched Phase Diversity”, IEE Electronics Letters, vol. 42, [D5] no. 16, August 2006 CONFERENCES [D6] J. M. Fabrega, E. T. López, J. A. Lázaro, M. Zuhdi, J. Prat, “Demonstration of a full duplex PON featuring 2.5 Gbps sub carrier multiplexing downstream and 1.25 Gbps upstream with colourless ONU and simple optics” European Conference on Optical Communications ECOC'08, Brussels, Belgium, September 2008. [D7] J. M. Fabrega, L. Vilabru, J. Prat, “Experimental Demonstration of Heterodyne Phase-locked loop for Optical Homodyne PSK Receivers in PONs” International Conference on Transparent Optical Networks ICTON’08, Athens, Greece, June 2008. J. M. Fabrega, J. Prat, “Simple Low-Cost Homodyne Receiver,” European Conference on Optical Communications ECOC'07, Berlin, Germany, [D8] September 2007. [D9] J. Prat, J. A. Lázaro, J. M. Fabrega, V. Polo, C. Bock, C. Arellano, M. Omella, “Next Generation Architectures for Optical Access and Enabling Technologies,” 5ª Reunión española de Optoelectrónica OPTOEL’07, Bilbao, Juliol de 2007 [D10] J. M. Fabrega, J. Prat, “Channel Crosstalk in ultra-dense WDM PON using Time-Switched Phase Diversity Optical Homodyne Reception,” International Conference on Transparent Optical Networks ICTON’07, Rome, Italy, July 2007. J. M. Fabrega, J. Prat, “Homodyne PSK Receiver with Electronic-Driven Phase Diversity and Fuzzy Logic Data Estimation”, European [D11] Conference on Optical Communications ECOC'06, Cannes, France, September 2006. [D12] C. Bock, J. M. Fabrega, J. Prat, “Ultra-Dense WDM PON based on Homodyne Detection and Local Oscillator Reuse for Upstream Transmission”, European Conference on Optical Communications ECOC'06, Cannes, France, September 2006. J. M. Fabrega, J. Prat, “Homodyne Receiver Implementation with Diversity Switching and Analogue Processing”, European Conference on [D13] Optical Communications ECOC'06, Cannes, France, September 2006. [D14] J. M. Fabrega, J. Prat, “Optimization of Heterodyne Optical Phase-Locked Loops: Loop Delay Impact and Transient Response Performances”, International Conference on Telecommunications ICT’06, Funchal (Madeira), Portugal, May 2006. J. M. Fabrega, J. Prat, “New Intradyne Receiver with Electronic-Driven Phase and Polarization Diversity”, Optical Fiber Communication [D15] OFC/NFOEC’06, paper JThB45, Anaheim (CA), USA, March 2006. J. Prat, J.M. Fabrega, “New Homodyne Receiver with Electronic I&Q Differential Demodulation”, European Conference on Optical [D16] Communications ECOC'05, paper We4.P.104, Glasgow, UK, September 2005.

UPC References GCO [1] C.-H. Lee, W. V. Sorin and B. Y. Kim, “Fiber to the Home Using a PON Infrastructure”, Journal of Lightwave Technology, vol. LT-24, no. 12, Dec. 2006, pp. 4568-4583 [2] L. Kazovsky, G. Kalogerakis and W.-T. Shaw, “Homodyne Phase-Shift-Keying Systems: Past Chalenges and Future Opportunities,” Journal of Lightwave Technology, vol. LT-24, no. 12, Dec. 2006, pp. 4876-4884 [3] J. A. Lázaro et al. “Scalable Extended Reach PON,” in Proc. OFC/NFOEC 2008, OThL2. [4] H.K.Philipp, A.L.Scholtz, E.Bonek, W.R.Leeb, “Costas Loop Experiments for a 10.6µm Communications Receiver”, IEEE Transactions on Communications, vol. COM-31, no. 8, Aug. 1983. [5] L.G. Kazovsky, “Decision-Driven Phase-Locked Loop for optical homodyne receivers: performance analysis and laser linewidth requirements” Journal of Lightwave Technology, vol LT-3, no. 6, Dec. 1985 [6] L.G. Kazovsky, “Balanced PLL for optical homodyne receivers: performance analysis, design considerations, and laser linewidth requirements,” Journal of Lightwave Technology, vol LT-4, no. 2, Feb. 1986 [7] K.H. Kudielka and W. Klaus, “Optical homodyne PSK receiver: Phase synchronization by maximizing baseband signal power,” in Proc. LEOS 1999, TuU2. [8] S. Camatel et al., “Optical phase-locked loop for coherent detection optical receiver,” Electronics Letters, vol. 40, no. 6, Mar. 2004 [9] R. Noé, “Phase noise-tolerant synchronous QPSK/BPSK baseband-type intradyne receiver concept with feedforward carrier recovery,” Lightwave Technology, Journal of, 2005, 23, 802-808 (2005) [10] M. G. Taylor, “Accurate digital phase estimation process for coherent detection using a parallel digital processor” 31st European Conference on Optical Communication, 2005. ECOC 2005. Volume 2, 25-29 Sept. 2005 Page(s):263 - 264 vol.2

UPC-GCO UPC- GThanksO C !! Universitat Politècnica de Catalunya Mª Josep Mª Fàbrega jmfabrega@tsc.upc.edu Universitat Politècnica de Catalunya (UPC) Dept. of Signal Theory and Communications (TSC) Optical Communications Group (GCO) www.tsc.upc.edu/gco

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