Open AccessExperimental demonstration of OAM-based transmitter mode diversity data transmission under atmosphere turbulence
Author(s) -
Andong Wang,
Long Zhu,
Mingliang Deng,
Bing Lü,
Xiaojie Guo
Publication year - 2021
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.420193
Subject(s) - transmitter , optics , physics , turbulence , free space optical communication , optical communication , fading , transmission (telecommunications) , bit error rate , mode (computer interface) , diversity gain , angular momentum , telecommunications , computer science , decoding methods , meteorology , channel (broadcasting) , quantum mechanics , operating system
Twisted light carrying orbital angular momentum (OAM), which features helical phase front, has shown its potential applications in diverse areas, especially in optical communications. For OAM-based free-space optical (FSO) links, a significant challenge is the power fading induced by atmospheric turbulence. In this paper, we experimentally demonstrate the mitigation of atmospheric turbulence effects with an OAM-based transmitter mode diversity scheme. By designing multi-OAM phase patterns, we successfully generate multiple OAM modes (OAM -1,0,1 , OAM +2,+3,+4 , OAM +5,+6,+7 ) carrying the same data stream for transmitter diversity without adding system complexity. An intensity-modulated direct-detection (IM-DD) system with 39.06 Gbit/s discrete multi-tone (DMT) signal is employed to confirm the feasibility of the OAM-based transmitter mode diversity scheme under atmosphere turbulence. The obtained experimental results show that the received power fluctuation and average bit-error rate (BER) are decreased under moderate to strong turbulence compared to the traditional single OAM mode transmission. In addition, the required transmitted power at 10% interruption probability is relaxed by nearly 2 dB under moderate to strong turbulence.