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Interchannel Nonlinearities in Polarization-Multiplexed Transmission

Interchannel Nonlinearities in Polarization-Multiplexed Transmission. Marcus Winter Klaus Petermann. Dario Setti. TECHNISCHE UNIVERSITÄT BERLIN. Hochfrequenztechnik-Photonik. http://www.marcuswinter.de/publications/ecoc2009.

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Interchannel Nonlinearities in Polarization-Multiplexed Transmission

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  1. Interchannel Nonlinearities in Polarization-Multiplexed Transmission Marcus Winter Klaus Petermann Dario Setti TECHNISCHE UNIVERSITÄT BERLIN Hochfrequenztechnik-Photonik http://www.marcuswinter.de/publications/ecoc2009

  2. cross-phase modulation (XPM)and cross-polarization modulation (XPolM)

  3. XPolM is similar to XPM

  4. XPolM – where and what?

  5. systems with large XPM impairment are affected(e.g. selective 10G  40G/100G upgrades) fully polarized signal becomes depolarized

  6. depolarization can be visualized on the Poincaré sphere quantified by nonlinear DOP reduction XPolM model exists to predict this magnitude* * Winter et al., JLT 17 (27), p. 3739, 2009.

  7. impairments in PolDM systems

  8. single-polarization Tx is replaced by PolDM Tx Rx signal processing can follow PMD changes, but not XPolM

  9. Rx polarization misalignment generates crosstalk between PolDM subchannels statistically, crosstalk depends only on the degree of polarization and the source amplitude

  10. interleaving RZ-shaped symbols minimizes crosstalk amplitude at target sampling instant even with interleaving, the crosstalk is never zero, but significantly smallerdue to signal distortions, noise, etc.

  11. system simulations

  12. nonlinear threshold of the NRZ interferers is reduced by 2dB due to XPolM(1dB when interleaving is used) 10 × 10G NRZ interferers w/ 25Gbaud PolDM-RZ-QPSK probe

  13. mean values ► individual distribution

  14. ROSNR penalties at 4 dBm NRZ power (mean DOP = 0.961)

  15. ROSNR penalties at 3 dBm NRZ power (mean DOP = 0.975)

  16. at 2 dBm, fluctuations become comparable toXPM-related spread at 4 dBm (3 dBm when interleaving is used) ROSNR penalties at 2 dBm NRZ power (mean DOP = 0.984)

  17. summary

  18. XPolM-induced depolarization leads to crosstalk between PolDM subchannels interleaving the subchannels can significantly reduce the crosstalk penalty (but not eliminate it) the mean nonlinear DOP reduction for 25 Gbaud PolDM-RZ-QPSK should not exceed 0.98 the resulting 10G NRZ interferer NLT penalty is up to2 dB over XPM alone

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