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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Source entropy controlled enumerative sphere shaping for a probabilistic shaping coherent optical transmission

Xuezhen Wang, Chenglin Bai, Bin Chen

|February 28, 2025

Summary

We introduce a new source entropy controlled enumerative sphere shaping (EC-ESS) method for flexible entropy control. EC-ESS offers improved achievable source entropies and significant optical signal-to-noise ratio (OSNR) gains over existing schemes.

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Area of Science:

Optical communications
Information theory

Background:

Sphere shaping is crucial for optimizing optical communication systems.
Current methods face limitations in flexible source entropy control.

Purpose of the Study:

To propose a novel EC-ESS scheme for enhanced source entropy control.
To improve OSNR performance in optical systems.

Main Methods:

Developed a model-driven interval search algorithm.
Established relationships between 1D and 2D symbol source entropies.
Conducted data analysis and experimental validation.

Main Results:

EC-ESS achieves a higher number of achievable source entropies than OESS across various ranges.
EC-ESS demonstrated OSNR gains of 0.04 dB over OESS.
EC-ESS showed OSNR gains of 0.27 dB and 0.52 dB over BL-DM and CCDM, respectively.

Conclusions:

The proposed EC-ESS scheme offers superior flexibility and performance.
EC-ESS provides significant OSNR improvements in optical systems.