Open AccessPerformance enhancement of free-space optical communications under atmospheric turbulence using modes diversity coherent receipt
Author(s) -
Donghao Zheng,
Yan Li,
Honghang Zhou,
Yiming Bian,
Chen Yang,
Wei Li,
Jifang Qiu,
Hongxiang Guo,
Xiaobin Hong,
Yong Zuo,
Ian Giles,
Weijun Tong,
Jian Wu
Publication year - 2018
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.26.028879
Subject(s) - turbulence , free space optical communication , physics , optics , antenna diversity , coherence (philosophical gambling strategy) , optical communication , bit error rate , telecommunications , computer science , antenna (radio) , meteorology , quantum mechanics , channel (broadcasting)
This paper numerically and experimentally investigates the performance of free-space optical receiver using modes diversity coherent receipt under moderate-to-strong turbulence. By utilizing a three-mode photonic lantern with digital maximum ratio combining, a 40 Gbps QPSK optical signal is received. The turbulence strength is measured by the ratio of beam diameter to atmospheric coherence length, D/r0. The larger the D/r0, the stronger the turbulence is, and vice versa. Compared with conventional single mode fiber based receipt, the required transmitted power can reduce by 4.6 dB and 4 dB at 10% interruption probability under turbulence strength D/r0 = 8 and 16. The required transmitted power at bit error ratio of 2.2 × 10 -2 can relax by 4.2 dB and 5 dB under turbulence strength D/r0 = 8 and 16.