Direct Detection Under Tukey Signalling

TL;DR

This paper introduces a novel direct-detection-compatible signaling scheme for short-distance fiber-optic communication that uses controlled inter-symbol interference to extract phase information, achieving near-coherent spectral efficiencies.

Contribution

It proposes a new signaling method that leverages controlled interference to enable phase information extraction with direct detection, improving spectral efficiency over existing methods.

Findings

Achieves spectral efficiency close to coherent detection

Utilizes controlled inter-symbol interference for phase extraction

Suitable for short-distance fiber-optic links

Abstract

A new direct-detection-compatible signalling scheme is proposed for fiber-optic communication over short distances. Controlled inter-symbol interference is exploited to extract phase information, thereby achieving spectral efficiencies about one bit less, per second per hertz, of those of a coherent detector.