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OUTLINE

OUTLINE. INTRODUCTION POLARIZATION MOD. / POL./DIFF. DETECTION DUOBINARY POLSK: FIBER NONLINEARITIES ROBUSTNESS DPSK-POLSK: EXPLOITING ABSOLUTE/RELATIVE PHASE CONCLUSIONS. OUTLINE. INTRODUCTION POLARIZATION MOD. / POL./DIFF. DETECTION DUOBINARY POLSK: FIBER NONLINEARITIES ROBUSTNESS

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OUTLINE

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  1. OUTLINE • INTRODUCTION • POLARIZATION MOD. / POL./DIFF. DETECTION • DUOBINARY POLSK: FIBER NONLINEARITIES ROBUSTNESS • DPSK-POLSK: EXPLOITING ABSOLUTE/RELATIVE PHASE • CONCLUSIONS INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  2. OUTLINE • INTRODUCTION • POLARIZATION MOD. / POL./DIFF. DETECTION • DUOBINARY POLSK: FIBER NONLINEARITIES ROBUSTNESS • DPSK-POLSK: EXPLOITING ABSOLUTE/RELATIVE PHASE • CONCLUSIONS INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  3. I. Introduction Light properties EM Wave Amplitude ASK PSK Phase Frequency FSK Polarization PolSK INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  4. Transmission Bandwidth Channel Spacing Spectral Efficiency Capacity Capacity = Channels x Bit Rate Channels = Bandwidth / Spacing Capacity = Bandwidth x Bit Rate / Spacing INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  5. Attenuation Dispersion NL Effects Noise Filtering L Crosstalk NL Crosstalk Inter XPM. Inter FWM GVD, PMD SPM, Intra XPM. Intra FWM ASE, Shot, Thermal, Phase MUX, OXC Main Impairments CS BW Old Fiber Plant INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  6. OUTLINE • INTRODUCTION • POLARIZATION MOD. / POL./DIFF. DETECTION • DUOBINARY POLSK: FIBER NONLINEARITIES ROBUSTNESS • DPSK-POLSK: EXPLOITING ABSOLUTE/RELATIVE PHASE • CONCLUSIONS INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  7. II. POLARIZATION MOD. Polarization Modulation (PolSK) INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  8. Polarization Modulation (PolSK) INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  9. IDEA Duobinary Modulation Polarization Modulation High S. Efficiency Fiber NL Robustness Dispersion Tolerance Fiber NL Influence Duobinary PolSK Dispersion Tolerance Fiber NL Robustness INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  10. Duobinary Modulation Signal 2 Level 3 Level 25 % Cut-off Bessel Filter INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  11. Duobinary PolSK Duobinary Filter at TX INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  12. Duobinary PolSK INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  13. Duobinary PolSK Duobinary Filter at RX INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  14. Duobinary PolSK NON-LINEAR EFFECTS AND CHROMATIC DISPERSION (SIMULATIONS) TX RX 4 dB 2 dB INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  15. Duobinary PolSK NON-LINEAR EFFECTS AND CHROMATIC DISPERSION (EXPERIMENTS – Nortel Networks Labs) 2 dB RX TX 12 dB INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  16. Duobinary PolSK Conclusions • A new transmission system is proposed • Chromatic Dispersion tolerance is maintained with respect Standard Duobinary (160 Km of SSMF) • Fiber Nonlinearities tolerance is very high • Moderate PMD (1ps/nm/km1/2) does not affect • The main drawback is the need of polarization tracking INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  17. OUTLINE • INTRODUCTION • POLARIZATION MOD. / POL./DIFF. DETECTION • DUOBINARY POLSK: FIBER NONLINEARITIES ROBUSTNESS • DPSK-POLSK: EXPLOITING ABSOLUTE/RELATIVE PHASE • CONCLUSIONS INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  18. IDEA DPSK / PolSK Concept EM wave Absolute Phase Orthogonality Relative Phase INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  19. DPSK / PolSK DPSK / PolSK Transmitter INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  20. DPSK / PolSK Receiver INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  21. DPSK / PolSK (Simulations) PHASE NOISE TOLERANCE Increased Tolerance 110MHz SENSITIVITY PENALTY vs. PSPS ORIENTATION 1.5dB DGD= 20 ps Diversity INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  22. DPSK / PolSK Conclusions • PolSK/DPSK supports higher linewidth values than oDQPSK (135 MHz / 25 MHz) • Back-to-back sensitivity is 1.5 dB better • Optimum PolSK orientation is ±54º • DPSK part performs in general better (PolSK penalty over 5 dB for PMD>40 ps and the PSPs are 0º/90º). • DPSK performance is improved when the PolSK modulator is active • DPSK signal is more robust to chromatic dispersion (800ps/nm against 200 ps/nm) • High tolerance against fiber non-linearity (20 dBm) INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  23. DPSK/PolSK Full Differential Detection INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  24. RZ-DPSK/PolSK Full Differential Detection INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  25. RZ-DPSK/PolSK Full Differential Detection Chromatic Dispersion 5dB 10% Phase Noise 5dB 30% INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  26. RZ-DPSK/PolSK Full Differential Detection Fiber Nonlinearities 20dBm TX Power over 100Km of SSMF 5dB Linear Crosstalk 2.7 Rb 5dB INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  27. RZ-DPSK/PolSK Full Differential Detection Differential Group Delay 5dB 40% Main Drawback INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  28. Full Differential DPSK / PolSK Conclusions • Regarding dispersion tolerance, the proposed system is slightly better (10% improvement at 5dB penalty). • Laser linewidth requirements are much less strict for the proposed scheme (30% more relative linewidth tolerated) • Regarding the non-linear effects (single channel), both systems well tolerates up to 20 dBm with no penalty. • In terms of linear crosstalk, both systems have a very close performance allowing a crosstalk free detection with channel spacing up to 3 times the bit rate. • The main drawback of the proposed system is the PMD influence. In the best case it tolerates a 40% less relative DGD with respect the DQPSK. INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  29. OUTLINE • INTRODUCTION • POLARIZATION MOD. / POL./DIFF. DETECTION • DUOBINARY POLSK: FIBER NONLINEARITIES ROBUSTNESS • DPSK-POLSK: EXPLOITING ABSOLUTE/RELATIVE PHASE • CONCLUSIONS INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

  30. III. CONCLUSIONS • PolSK can be used to reduce crosstalk • Polarization Interleaving in IM/DD • Polarization Modulation reduces NL • PolSK can be used to extend S. Efficiency • PolSK can be used as orthogonal mod. • Differential detection avoids Pol. Tracking • PMD is a main drawback INVESTIGATION OF ADVANCED MODULATION FORMATS FOR FUTURE OPTICAL FIBER COMMUNICATIONS

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