TY - GEN
T1 - FEC-assisted Soft Radius Directed Equalization in Coherent Optical Interconnection
AU - Song, Junyuan
AU - Dong, Ze
AU - Xin, Xiangjun
AU - Wang, Rui
AU - Ming, Jun
AU - Mu, Yujia
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025
Y1 - 2025
N2 - This paper proposes an FEC-assisted soft radius directed equalization with recursive least squares algorithm (FEC-assisted RLS-SoftRDE) algorithm for robust polarization demultiplexing in bandwidth-limited coherent systems. Using soft information from FEC-decoder to generate probabilistic "soft ring" symbol radius estimates, our created a more reliable error reference than hard decisions. Demonstrated in a challenging 60 GBaud DP-64QAM system, the algorithm overcomes bandwidth-induced ISI limitations and mitigates rapid polarization rotation (RSOP). Results show significant gains: >3 dB lower EVM (~-18 dB), LDPC decoding to 1e-5 BER in 3-5 iterations, and 4.5 MHz RSOP tracking capability.
AB - This paper proposes an FEC-assisted soft radius directed equalization with recursive least squares algorithm (FEC-assisted RLS-SoftRDE) algorithm for robust polarization demultiplexing in bandwidth-limited coherent systems. Using soft information from FEC-decoder to generate probabilistic "soft ring" symbol radius estimates, our created a more reliable error reference than hard decisions. Demonstrated in a challenging 60 GBaud DP-64QAM system, the algorithm overcomes bandwidth-induced ISI limitations and mitigates rapid polarization rotation (RSOP). Results show significant gains: >3 dB lower EVM (~-18 dB), LDPC decoding to 1e-5 BER in 3-5 iterations, and 4.5 MHz RSOP tracking capability.
KW - bandwidth limitation
KW - coherent optical system
KW - forward error correction
KW - polarization demultiplexing
KW - rotation of states of polarization
UR - https://www.scopus.com/pages/publications/105034183331
U2 - 10.1109/ACP66871.2025.11349870
DO - 10.1109/ACP66871.2025.11349870
M3 - Conference contribution
AN - SCOPUS:105034183331
T3 - Asia Communications and Photonics Conference, ACP
BT - 2025 Asia Communications and Photonics Conference, ACP 2025
PB - Optica Publishing Group (formerly OSA)
T2 - 2025 Asia Communications and Photonics Conference, ACP 2025
Y2 - 5 November 2025 through 8 November 2025
ER -