Compressed Shaping: Concept and FPGA Demonstration
Artikel i vetenskaplig tidskrift, 2021

Probabilistic shaping (PS) has been widely studied and applied to optical fiber communications. The encoder of PS expends the number of bit slots and controls the probability distribution of channel input symbols. Not only studies focused on PS but also most works on optical fiber communications have assumed source uniformity (i.e. equal probability of marks and spaces) so far. On the other hand, the source information is in general nonuniform, unless bit-scrambling or other source coding techniques to balance the bit probability is performed. Interestingly, one can exploit the source nonuniformity to reduce the entropy of the channel input symbols with the PS encoder, which leads to smaller required signal-to-noise ratio at a given input logic rate. This benefit is equivalent to a combination of data compression and PS, and thus we call this technique compressed shaping. In this work, we explain its theoretical background in detail, and verify the concept by both numerical simulation and a field programmable gate array (FPGA) implementation of such a system. In particular, we find that compressed shaping can reduce power consumption in forward error correction decoding by up to 90% in nonuniform source cases. The additional hardware resources required for compressed shaping are not significant compared with forward error correction coding, and an error insertion test is successfully demonstrated with the FPGA.

optical fiber communication

Coding

source coding

data compression

distribution matching

probabilistic shaping

implementation

modulation

entropy

Författare

Tsuyoshi Yoshida

Osaka University

Koji Igarashi

Osaka University

Magnus Karlsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Erik Agrell

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Kommunikationssystem

Journal of Lightwave Technology

0733-8724 (ISSN)

Vol. In Press

Ämneskategorier

Telekommunikation

Signalbehandling

Annan elektroteknik och elektronik

DOI

10.1109/JLT.2021.3085974

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Senast uppdaterat

2021-06-23