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Adaptive Pre/Post-Compensation of Cascade Filters in Coherent Optical Transponders

Author

Listed:
  • Ahmad Abdo

    (School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada)

  • Claude D’Amours

    (School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada)

Abstract

We propose an adaptive joint pre- and post-compensation to correct the filtering effects caused by cascading reconfigurable optical add drop multiplexers (ROADMs). The improvement is achieved without using additional hardware (HW) on the link or within the signal processor in the transponders. Using Monte Carlo simulations, the gradient-descent based method shows an improvement of 0.6 dB and 1.1 dB in the required optical signal-to-noise ratio (R-OSNR) at the threshold pre-decoder bit error rate (BER) of 0.02 versus pre-compensation only in the linear and nonlinear operating region of fiber respectively. We experimentally verified the method with lab measurements in the presence of heavy filtering and optical impairments. We observed a gain up to ~0.4 dB compared to typically used pre-compensation only. Additionally, other tangible system benefits of our method are listed and discussed.

Suggested Citation

  • Ahmad Abdo & Claude D’Amours, 2020. "Adaptive Pre/Post-Compensation of Cascade Filters in Coherent Optical Transponders," Future Internet, MDPI, vol. 12(2), pages 1-18, January.
    • Handle: RePEc:gam:jftint:v:12:y:2020:i:2:p:21-:d:312911
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    References listed on IDEAS

    as
    1. Ahmad Abdo & Sadok Aouini & Bilal Riaz & Naim Ben-Hamida & Claude D’Amours, 2019. "Adaptive Coherent Receiver Settings for Optimum Channel Spacing in Gridless Optical Networks," Future Internet, MDPI, vol. 11(10), pages 1-13, September.
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