Staircase Codes: FEC for 100 Gb/s OTN

Abstract

Staircase codes, a new class of forward-error-correction (FEC) codes suitable for high-speed optical communications, are introduced. An ITU-T G.709-compatible staircase code with rate R=239/255 is proposed, and FPGA-based simulation results are presented, exhibiting a net coding gain (NCG) of 9.41 dB at an output error rate of 1E-15, an improvement of 0.42 dB relative to the best code from the ITU-T G.975.1 recommendation. An error floor analysis technique is presented, and the proposed code is shown to have an error floor at 4.0E-21.Comment: To appear in IEEE/OSA J. of Lightwave Technolog

A configurable FPGA FEC unit for Tb/s optical communication

“…Based on the syndromes, the error positions are found by a number of table-look-ups for finding roots in 2 nd and 3 rd degree polynomials. The approach is described in detail in [13]. The calculations are performed in the finite field GF(1024) based on logarithm and exponential tables.…”

“…The latter presents a product code with a more advanced interleaving scheme reducing the number of bits to take into account at the decoding. Staircase codes [13] may also be seen as product codes with an advanced interleaving scheme and with similar performance. Operating with a larger overhead, hard decision schemes that deliver more than 10 dB NCGs are also product code solutions, see e.g.…”

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