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Accelerated optical MIMO equalization for SDM coherent optical communication systems.

Xiuquan Cui, Linsheng Fan, Jianyu Wang

|December 19, 2025

Summary

This summary is machine-generated.

This study introduces a pilot-aided optical MIMO system to combat crosstalk, frequency offset, and phase noise in high-speed optical communications. The novel approach enables efficient real-time compensation, improving system performance.

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Last Updated: Jan 8, 2026

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Published on: February 6, 2014

Area of Science:

Optical Communications
Signal Processing
Information Theory

Background:

Space-division multiplexing (SDM) systems face channel crosstalk, increasing power consumption and latency.
Real-time reconfiguration of optical MIMO processors is challenging in time-varying channels with multiple impairments.

Purpose of the Study:

To propose a pilot-aided optical MIMO joint compensation scheme for SDM coherent optical systems.
To address channel crosstalk, frequency offset (FO), and phase noise (PN) simultaneously.

Main Methods:

Embedding frequency-domain pilot tones in digital subcarrier multiplexing (DSCM) signals to create a composite transmission matrix.
Dynamically controlling Mach-Zehnder interferometer (MZI) phase shifters for optical mode decoupling.
Implementing a staged optimization strategy with gradient algorithms (GD, NAG, Adam, Lookahead) for cascaded optical MIMO processors.

Main Results:

The staged optimization strategy significantly accelerates convergence, with Nesterov's accelerated gradient (NAG) converging in 20 iterations.
The proposed optical MIMO scheme shows a minimal 0.2 dB OSNR sensitivity penalty for an 800-Gb/s DP 16-QAM signal.

Conclusions:

The pilot-aided optical MIMO scheme effectively compensates for crosstalk, FO, and PN in SDM systems.
This approach offers a viable solution for high-capacity optical communication systems demanding real-time processing and low latency.