Open AccessSuppression of large error floor in 1024 QAM digital coherent transmission by compensating for GAWBS phase noise
Author(s) -
Masato Yoshida,
Naoya Takefushi,
Keisuke Kasai,
Toshihiko Hirooka
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.036691
Subject(s) - quadrature amplitude modulation , phase noise , optics , transmission (telecommunications) , qam , noise (video) , modulation (music) , physics , brillouin scattering , phase modulation , noise floor , quantum noise , analog transmission , bit error rate , computer science , acoustics , telecommunications , digital signal , noise measurement , noise reduction , optical fiber , channel (broadcasting) , quantum mechanics , artificial intelligence , image (mathematics) , quantum
There is a large error floor in an ultra multi-level digital coherent transmission signal of 1024 QAM or higher, and we have yet to determine its origin. In this paper, we show that this large error floor results from guided acoustic-wave Brillouin scattering (GAWBS) phase noise. We prove experimentally that such an error floor can be greatly reduced by compensating for the GAWBS noise with a phase modulation technique. We show that the BER of a 1024 QAM signal was reduced from 8.7 × 10 -4 to 2.7 × 10 -4 after a 160 km transmission with GAWBS noise compensation. Furthermore, we successfully extend the transmission distance from 160 to 240 km with a 7% overhead forward error correction.