Performance enhancement of free-space optical communications under atmospheric turbulence using modes diversity coherent receipt.
Performance enhancement of free-space optical communications under atmospheric turbulence using modes diversity coherent receipt.
复制标题
DOI：
10.1364/oe.26.028879
复制
发表时间：
2018-10
期刊：
影响因子：
3.8
通讯作者：
D. Zheng;Yan Li;Honghang Zhou;Yiming Bian;Chen Yang;Wei Li;J. Qiu;Hongxiang Guo;X. Hong;
中科院分区：
文献类型：
--
作者：
D. Zheng;Yan Li;Honghang Zhou;Yiming Bian;Chen Yang;Wei Li;J. Qiu;Hongxiang Guo;X. Hong;
本文通过数值和实验研究了自由空间光接收机在中强湍流条件下的模分集相干接收性能。利用数字最大比组合的三模光子灯，接收到40gbps的QPSK光信号。湍流强度用光束直径与大气相干长度的比值D/r0来测量。D/r0越大，湍流越强，反之亦然。湍流强度D/r0 = 8和16时，在中断概率为10%的情况下，与传统单模光纤接收相比，所需发射功率分别降低4.6 dB和4 dB。当湍流强度D/r0 = 8和16时，误码率为2.2 × 10-2时所需的传输功率可分别松弛4.2 dB和5db。
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.