30% Reach Increase via Low-complexity Hybrid HD/SD FEC and Nonlinearity-tolerant 4D Modulation

TL;DR

This paper demonstrates a 30% increase in transmission reach for optical communications by combining advanced 4D modulation formats with low-complexity hybrid FEC decoders, enabling higher data rates over long distances.

Contribution

It introduces a novel combination of geometrically-shaped 4D modulation and soft-aided FEC decoding, achieving significant reach improvements in optical fiber transmission.

Findings

30% reach increase over conventional methods

Successful experimental transmission of 11x218 Gbit/s channels

Enhanced performance with low-complexity hybrid FEC decoding

Abstract

Current optical coherent transponders technology is driving data rates towards 1 Tb/s/{\lambda}and beyond. This trend requires both high-performance coded modulation schemes and efficient implementation of the forward-error-correction (FEC) decoder. A possible solution to this problem is combining advanced multidimensional modulation formats with low-complexity hybrid HD/SD FEC decoders. Following this rationale, in this paper we combine two recently introduced coded modulation techniques:the geometrically-shaped 4D-64 polarization ring-switched and the soft-aided bit-marking-scaled reliability decoder. This joint scheme enabled us to experimentally demonstrate the transmission of 11x218 Gbit/s channels over transatlantic distances at 5.2bit/4D-sym. Furthermore, a 30% reach increase is demonstrated over PM-8QAM and conventional HD-FEC decoding for product codes.