BER performance analysis of radio over free-space optical systems considering laser phase noise under Gamma-Gamma turbulence channels.
BER performance analysis of radio over free-space optical systems considering laser phase noise under Gamma-Gamma turbulence channels.
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DOI：
10.1364/oe.17.004479
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发表时间：
2009-03
期刊：
影响因子：
3.8
通讯作者：
W. Lim;Changho Yun;Kiseon Kim
中科院分区：
文献类型：
--
作者：
W. Lim;Changho Yun;Kiseon Kim
分析了考虑激光相位噪声的自由空间光无线通信系统在Gamma-Gamma湍流信道下的误码性能。采用使用双驱动马赫-曾德尔调制器（DD-MZM）和移相器的外部调制，因为DD-MZM对于激光啁啾是鲁棒的并且提供高光谱效率。推导了不同湍流强度和激光二极管（LD）线宽对平均误码率的影响，并分析了实际情况下平均误码率的变化规律。结果表明，对于给定的归一化平均信噪比，两个线宽分别为624 MHz和10 MHz的LD在弱湍流下的平均误码率之差几乎是强湍流下的3倍。
This paper analytically investigates a bit error rate (BER) performance of radio over free space optical (FSO) systems considering laser phase noise under Gamma-Gamma turbulence channels. An external modulation using a dual drive Mach-Zehnder modulator (DD-MZM) and a phase shifter is employed because a DD-MZM is robust against a laser chirp and provides high spectral efficiency. We derive a closed form average BER as a function of different turbulence strengths and laser diode (LD) linewidth, and investigate its analytical behavior under practical scenario. As a result, for a given average SNR with normalized perturbation, it is shown that the difference of average BER corresponding to two LDs (with linewidth of 624 MHz and 10 MHz) under weak turbulence is almost 3 times larger than that under strong turbulence.