# First Experimental Demonstration of Probabilistic Enumerative Sphere Shaping in Optical Fiber Communications

## TL;DR

This paper demonstrates the first experimental implementation of probabilistic enumerative sphere shaping in optical fiber communications, achieving significant reach improvements over traditional methods.

## Contribution

It introduces probabilistic enumerative sphere shaping and shows its practical benefits in long-distance optical fiber transmission.

## Key findings

- 15% reach increase over constant composition distribution matching
- Successful transmission of 64-QAM at 350 Gbit/s over 1610 km
- Validation of probabilistic enumerative sphere shaping in real-world optical systems

## Abstract

We transmit probabilistic enumerative sphere shaped dual-polarization 64-QAM at 350Gbit/s/channel over 1610km SSMF using a short blocklength of 200. A reach increase of 15% over constant composition distribution matching with identical blocklength is demonstrated.