Variable-Rate FEC Decoder VLSI Architecture for 400G Rate-Adaptive Optical Communication
Paper in proceeding, 2019

Optical communication systems rely on forward error correction (FEC) to decrease the error rate of the received data. Since the properties of the optical channel will vary over time, a variable FEC coding gain would be useful. For example, if the channel conditions are benign, lower code overhead can be used, effectively increasing the code rate. We introduce a variable-rate FEC decoder architecture that can operate in several different modes, where each mode is linked to code rate and decoding iterations. We demonstrate a decoder implementation that provides a net coding gain range of 9.96–10.38 dB at a post-FEC bit-error rate of 10^-15. For this range, a decoder implemented in a 28-nm process technology offers throughputs in excess of 400 Gbps, decoding latencies below 53 ns and a power dissipation of less than 0.95 W (or 1.3 pJ/information bit).


Vikram Jain

Chalmers, Computer Science and Engineering (Chalmers)

Christoffer Fougstedt

Chalmers, Computer Science and Engineering (Chalmers), Computer Engineering (Chalmers)

Per Larsson-Edefors

Chalmers, Computer Science and Engineering (Chalmers), Computer Engineering (Chalmers)

2019 26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019

978-1-7281-0996-1 (ISBN)

26th IEEE Int. Conf. on Electronics, Circuits and Systems
Genova, Italy,

Energy-efficient optical fibre communication

Knut and Alice Wallenberg Foundation (KAW2013.0021), 2014-07-01 -- 2019-06-30.

Subject Categories

Computer Engineering


Communication Systems

Areas of Advance

Information and Communication Technology

Driving Forces

Sustainable development



More information

Latest update