Experimental Verification of Rate Flexibility and Probabilistic Shaping by 4D Signaling

TL;DR

This paper experimentally verifies the rate flexibility and probabilistic shaping benefits of 4D signaling in short-reach transmission, demonstrating a rate granularity of 0.5 bits/QAM symbol using a simple distribution matcher.

Contribution

It provides the first experimental validation of rate flexibility and probabilistic shaping in 4D signaling for short-reach links, using a straightforward distribution matcher.

Findings

Achieved 0.5 bits/QAM symbol rate granularity.

Validated probabilistic shaping gain in 4D signaling.

Demonstrated practical implementation with simple lookup table.

Abstract

The rate flexibility and probabilistic shaping gain of $4$-dimensional signaling is experimentally tested for short-reach, unrepeated transmission. A rate granularity of 0.5 bits/QAM symbol is achieved with a distribution matcher based on a simple look-up table.