Open AccessInvestigation for achievable NCG of optical FEC coding with convolutional code using optical XOR gates based on four‐wave mixing in highly non‐linear fibre
Author(s) -
Aikawa Yohei,
Uenohara Hiroyuki
Publication year - 2020
Publication title -
iet optoelectronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 42
eISSN - 1751-8776
pISSN - 1751-8768
DOI - 10.1049/iet-opt.2019.0029
Subject(s) - convolutional code , forward error correction , coding gain , computer science , mathematics , binary number , phase shift keying , keying , bit error rate , algorithm , electronic engineering , channel (broadcasting) , telecommunications , decoding methods , engineering , arithmetic
This study has given the investigation for achievable net coding gain (NCG) of optical forward error correction (FEC) coding scheme with convolutional code to control the received sensitivity following a required signal‐to‐noise ratio in the communication channel. The achievable NCG is obtained from the difference between the upper bound NCG and the power penalty of the optical exclusive‐OR (XOR) gate, which is based on a four‐wave mixing in highly non‐linear fibre. The upper bound NCG was analytically derived by calculating error probability of optimal convolutional code, and the power penalty was numerically derived by comparing bit‐error rates between with and without the optical FEC coding. To confirm the feasibility for achieving the highest NCG, the optimal operating condition of the optical XOR gate is experimentally evaluated to minimise their power penalty. A 0.5 dB power penalty was obtained at BER = 10 − 9under the optimised condition with 2 23 −1 pseudo‐random binary sequence differential phase‐shift keying‐modulated return to zero signal at 10 Gbps.