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Matched Filtering for MIMO Coherent Optical Communications with Mode-Dependent Loss Channels.

Luis M Torres1, Francisco J Cañete2, Luis Díez2

  • 1Research and Development Department, KDPOF SL, 28760 Madrid, Spain.

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Summary

This study presents a linear MIMO receiver for coherent SDM optical systems, optimizing minimum mean square error (MMSE) without assuming negligible mode-dependent loss (MDL). It demonstrates a match filter receiver

Keywords:
MIMO adaptive equalizerMMSEcoherent optical communicationfractional-spaced equalizer (FSE)matched filteroptical fiber communicationpolarization division multiplexingspatial division multiplexing (SDM)

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Area of Science:

  • Optical Communications
  • Signal Processing
  • Digital Communications

Background:

  • Digital signal processors (DSP) are widely used for equalizing coherent optical communication systems employing spatial division multiplexing (SDM).
  • Existing DSP approaches often neglect the impact of mode-dependent loss (MDL), a critical factor in SDM systems.
  • Linear multiple-input multiple-output (MIMO) receivers are essential for advanced optical communication architectures.

Purpose of the Study:

  • To develop and analyze a linear MIMO receiver for coherent SDM optical systems that optimizes minimum mean square error (MMSE).
  • To investigate the system performance without prior assumptions on receiver oversampling or analog front-end limitations.
  • To evaluate the influence of the transmitter's roll-off factor on system performance.

Main Methods:

  • Design of a linear MIMO receiver focused on MMSE optimization for coherent SDM systems.
  • Analysis of a simple match filter (MF) based MIMO receiver's capability to eliminate inter-symbol interference (ISI) and crosstalk.
  • Numerical simulations evaluating a fractionally-spaced equalizer (FSE) MIMO receiver in MDL-impaired channels using novel signal-to-noise and distortion ratio (SNDR) loss metrics.

Main Results:

  • Demonstrated that a MF-based MIMO receiver can completely eliminate ISI and crosstalk in SDM systems when MDL is negligible.
  • Quantified the performance degradation in MDL-impaired channels using SNDR loss.
  • Showcased performance improvements achievable by increasing the transmitter roll-off factor.

Conclusions:

  • The proposed linear MIMO receiver framework effectively addresses equalization challenges in coherent SDM optical systems, even with non-negligible MDL.
  • The study highlights the trade-offs between system parameters like the roll-off factor and performance metrics.
  • This research provides valuable insights for designing robust optical receivers in advanced SDM communication networks.