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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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C-band PAM-4 signal transmission using soft-output MLSE and LDPC code.

S-R Moon, H-S Kang, H Y Rha

|January 16, 2019

Summary

This summary is machine-generated.

We developed a new digital signal processing (DSP) scheme using a soft-output maximum likelihood sequence equalizer (sMLSE) and low-density parity-check (LDPC) code for C-band PAM-4 transmission, achieving significant optical signal-to-noise ratio (OSNR) gains.

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Area of Science:

Optical Communications
Digital Signal Processing
Coding Theory

Background:

C-band PAM-4 transmission systems face challenges with signal integrity and error correction.
Integrating equalization and error correction codes is crucial for improving performance.

Purpose of the Study:

To propose and experimentally validate a novel DSP scheme combining sMLSE and LDPC codes for enhanced C-band PAM-4 transmission.
To evaluate the performance gains of the proposed sMLSE-LDPC scheme compared to conventional MLSE-RS systems.

Main Methods:

Modification of MLSE to soft-output (sMLSE) using the Max-log BCJR algorithm.
Integration of a low-overhead LDPC code with sMLSE.
Experimental investigation in a 56 Gb/s C-band PAM-4 system.
Performance comparison with MLSE-RS code, including analysis of burst errors and the effect of an interleaver.

Main Results:

The sMLSE-LDPC scheme achieved an additional optical signal-to-noise ratio (OSNR) gain of 0.6 dB to 2.1 dB compared to MLSE-RS.
The OSNR gain is influenced by burst errors caused by power fading.
Employing an interleaver improved the relative OSNR gain to 1.6 dB - 2.1 dB by mitigating burst errors.
Successful experimental demonstration of 30 km transmission at 56 Gb/s PAM-4 in the C-band using the proposed scheme with an interleaver.

Conclusions:

The proposed sMLSE-LDPC scheme offers significant performance improvements for C-band PAM-4 systems.
The integration of sMLSE with LDPC codes, particularly with an interleaver, effectively combats burst errors and enhances transmission performance.
This approach enables robust and high-speed optical communication over extended distances.