Enhancing oFEC using MAP Decoding of BCH Component Codes

Søren Forchhammer; Jakob Dahl Andersen; Knud J. Larsen

doi:10.1109/ISTC65386.2025.11154622

Enhancing oFEC using MAP Decoding of BCH Component Codes

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

Abstract

Forward error correction (FEC) plays a vital role in optical communication. The open FEC code (oFEC) is a very efficient code suitable for high-speed optical communication and used for e.g. 200-800 Gbit/s solutions. The oFEC code is based on component BCH codes. We investigate maximum a posteriori (MAP) algorithms for soft-in soft-out (SISO) decoding of the BCH codes and present an efficient algorithm that speeds up this MAP decoding significantly. In simulations, we demonstrate a SISO MAP decoding that satisfies the ITU-T 709.3 specification of a bit error rate (BER) output value of 10−9 at a BER input value of 0.025. In terms of coding gain, this corresponds to an improvement of 0.4 dB compared to the requirement of the ITU-T 709.3 specification.

Original language	English
Title of host publication	Proceedings of 13^th International Symposium on Topics in Coding (ISTC 2025)
Publisher	IEEE
Publication date	2025
Pages	1-5
Article number	11154622
ISBN (Print)	979-8-3315-8984-4
DOIs	https://doi.org/10.1109/ISTC65386.2025.11154622
Publication status	Published - 2025
Event	13^th International Symposium on Topics in Coding - UCLA Campus, Los Angeles, United States Duration: 18 Aug 2025 → 22 Aug 2025

Conference

Conference	13^th International Symposium on Topics in Coding
Location	UCLA Campus
Country/Territory	United States
City	Los Angeles
Period	18/08/2025 → 22/08/2025

Keywords

Codes
Bit error rate
Forward error correction
Optical fiber communication
Encoding
Decoding
Gain

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10.1109/ISTC65386.2025.11154622

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title = "Enhancing oFEC using MAP Decoding of BCH Component Codes",

abstract = "Forward error correction (FEC) plays a vital role in optical communication. The open FEC code (oFEC) is a very efficient code suitable for high-speed optical communication and used for e.g. 200-800 Gbit/s solutions. The oFEC code is based on component BCH codes. We investigate maximum a posteriori (MAP) algorithms for soft-in soft-out (SISO) decoding of the BCH codes and present an efficient algorithm that speeds up this MAP decoding significantly. In simulations, we demonstrate a SISO MAP decoding that satisfies the ITU-T 709.3 specification of a bit error rate (BER) output value of 10−9 at a BER input value of 0.025. In terms of coding gain, this corresponds to an improvement of 0.4 dB compared to the requirement of the ITU-T 709.3 specification.",

keywords = "Codes, Bit error rate, Forward error correction, Optical fiber communication, Encoding, Decoding, Gain",

author = "S{\o}ren Forchhammer and Andersen, \{Jakob Dahl\} and Larsen, \{Knud J.\}",

year = "2025",

doi = "10.1109/ISTC65386.2025.11154622",

language = "English",

isbn = "979-8-3315-8984-4",

pages = "1--5",

booktitle = "Proceedings of 13th International Symposium on Topics in Coding (ISTC 2025)",

publisher = "IEEE",

address = "United States",

note = "13<sup>th</sup> International Symposium on Topics in Coding, ISTC2025 ; Conference date: 18-08-2025 Through 22-08-2025",

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TY - GEN

T1 - Enhancing oFEC using MAP Decoding of BCH Component Codes

AU - Forchhammer, Søren

AU - Andersen, Jakob Dahl

AU - Larsen, Knud J.

PY - 2025

Y1 - 2025

N2 - Forward error correction (FEC) plays a vital role in optical communication. The open FEC code (oFEC) is a very efficient code suitable for high-speed optical communication and used for e.g. 200-800 Gbit/s solutions. The oFEC code is based on component BCH codes. We investigate maximum a posteriori (MAP) algorithms for soft-in soft-out (SISO) decoding of the BCH codes and present an efficient algorithm that speeds up this MAP decoding significantly. In simulations, we demonstrate a SISO MAP decoding that satisfies the ITU-T 709.3 specification of a bit error rate (BER) output value of 10−9 at a BER input value of 0.025. In terms of coding gain, this corresponds to an improvement of 0.4 dB compared to the requirement of the ITU-T 709.3 specification.

AB - Forward error correction (FEC) plays a vital role in optical communication. The open FEC code (oFEC) is a very efficient code suitable for high-speed optical communication and used for e.g. 200-800 Gbit/s solutions. The oFEC code is based on component BCH codes. We investigate maximum a posteriori (MAP) algorithms for soft-in soft-out (SISO) decoding of the BCH codes and present an efficient algorithm that speeds up this MAP decoding significantly. In simulations, we demonstrate a SISO MAP decoding that satisfies the ITU-T 709.3 specification of a bit error rate (BER) output value of 10−9 at a BER input value of 0.025. In terms of coding gain, this corresponds to an improvement of 0.4 dB compared to the requirement of the ITU-T 709.3 specification.

KW - Codes

KW - Bit error rate

KW - Forward error correction

KW - Optical fiber communication

KW - Encoding

KW - Decoding

KW - Gain

U2 - 10.1109/ISTC65386.2025.11154622

DO - 10.1109/ISTC65386.2025.11154622

M3 - Article in proceedings

SN - 979-8-3315-8984-4

SP - 1

EP - 5

BT - Proceedings of 13th International Symposium on Topics in Coding (ISTC 2025)

PB - IEEE

T2 - 13<sup>th</sup> International Symposium on Topics in Coding

Y2 - 18 August 2025 through 22 August 2025

ER -

Enhancing oFEC using MAP Decoding of BCH Component Codes

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Keywords

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