Free-space Coherent Optical Communication System Using Irradiance Modulation with Dynamic Detection Threshold

被引：0
|
作者：
Sun X. [1 ]
Li L. [2 ,3 ]
机构：
[1] Modern Engineering Training Center, Chang'an University, Xi'an
[2] Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun
[3] University of Chinese Academy of Sciences, Beijing
来源：
Faguang Xuebao/Chinese Journal of Luminescence | 2019年 / 40卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Coherent detection; Dynamic detection threshold; Free-space optical communications;
D O I：
10.3788/fgxb20194009.1200
中图分类号：
学科分类号：
摘要：
Free-space coherent optical communication system using irradiance modulation(IM/CD) with dynamic detection threshold is proposed. Compared with traditional irradiance modulation and direct detection(IM/DD) systems, the system we proposed can detect the signal without requiring the knowledge of instantaneous channel state information(CSI) and the probability density function(pdf) of the turbulence model and achieve better average bit error rate(BER) just by only improving the LO power. Analytical expressions are derived for the average bit error rate of the system. Numerical studies show that the proposed system can achieve comparable performance to the idealized adaptive detection system, with a signal-to-noise ratio performance loss of only 1.4 dB at a BER of 10-9 for a lognormal turbulence channel with σ=0.25 and phase noise with σφ=0.07 when the local oscillator(LO) amplitude and transmitting amplitude are assumed to be unity. © 2019, Science Press. All right reserved.
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页码：1200 / 1206
页数：6
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