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Simplified bit-class probabilistic shaping strategy based on PDM systems.

Yilan Ma, Jianxin Ren, Bo Liu

|November 15, 2024

Summary

This summary is machine-generated.

This study introduces a simplified probabilistic shaping (PS) strategy using power domain multiplexing (PDM) for enhanced signal quality. The novel bit-weighted distribution matching (BWDM) method improves receiving sensitivity in high-speed optical communication systems.

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Area of Science:

Optical communication systems
Signal processing
Information theory

Background:

Probabilistic shaping (PS) is crucial for optimizing optical communication performance.
Power domain multiplexing (PDM) offers a framework for advanced signal encoding.
Existing PS schemes can be complex, limiting practical implementation.

Purpose of the Study:

To develop a simplified bit-class probabilistic shaping (PS) strategy for PDM systems.
To enhance signal quality and transmission efficiency using low-complexity methods.
To validate the proposed scheme experimentally.

Main Methods:

Employed bit-weighted distribution matching (BWDM) for probabilistic shaping.
Utilized signal superposition for encoding bits in a low-power QPSK signal.
Implemented a region decision method for demodulation at the receiver.

Main Results:

Achieved accurate signal transmission at a net rate of 103.6 Gb/s over a 2 km 7-core fiber.
The proposed PS-16QAM signal demonstrated improved receiving sensitivity (0.4 dB and 0.33 dB gains).
The scheme outperformed uniform 16QAM and PDM-OFDM signals without PS at a BER of 3.8 × 10⁻³.

Conclusions:

The simplified bit-class PS strategy based on PDM is effective for high-speed optical communications.
The BWDM approach offers a low-complexity and efficient method for achieving probabilistic shaping.
The experimental validation confirms the practical benefits of the proposed scheme in terms of performance and efficiency.