本振功率对空间平衡探测器相干探测灵敏度的影响

发布时间：2018-04-19 01:13

本文选题：相干光通信 + 平衡探测器　；参考：《光学精密工程》2017年02期

【摘要】：为了探寻空间相干光通信中本振功率与相干探测灵敏度间的关系,建立了本振光功率变化对相干探测灵敏度影响的数学模型,仿真分析了不同参数状态下本振功率对相干探测灵敏度的影响。采用自研开发的高速大面积空间耦合平衡探测器搭建了相干探测灵敏度测试实验系统,并就本振功率对探测灵敏度的影响进行了实验验证。实验结果表明:相干探测系统中,两光电管不可能完全匹配,探测灵敏度始终受到本振强度噪声的影响,在探测器环境参数一定时,存在最佳本振光功率值使得相干探测灵敏度取最大值。在误码率为10-12、通信速率为5Gb/s的条件下,相干探测灵敏度测试的最大值为-40.16dBm,此时对应的本振光功率为9dBm,与理论极限值基本一致。该模型对提高相干探测系统的探测灵敏度具有指导意义。
[Abstract]:In order to explore the relationship between local oscillator power and coherent detection sensitivity in spatial coherent optical communication, a mathematical model of the influence of local oscillator power change on coherent detection sensitivity is established.The effect of local oscillator power on the sensitivity of coherent detection is simulated and analyzed.An experimental system for measuring the sensitivity of coherent detection is built by using a high speed and large area spatial coupling balance detector developed by ourselves, and the effect of local oscillator power on the detection sensitivity is verified experimentally.The experimental results show that in the coherent detection system, the two photodiodes can not be exactly matched, the detection sensitivity is always affected by the local oscillator intensity noise, and the detection sensitivity is always affected by the local oscillator intensity noise, and when the environmental parameters of the detector are fixed,There is an optimal local oscillator power value to maximize the sensitivity of coherent detection.When the bit error rate is 10-12 and the communication rate is 5Gb/s, the maximum sensitivity of coherent detection is -40.16 dBm.The corresponding local oscillator power is 9dBm, which is basically consistent with the theoretical limit.The model can improve the sensitivity of coherent detection system.
【作者单位】：武汉大学电子信息学院;湖北师范大学教育信息与技术学院;地球空间信息技术协同创新中心;
【基金】：国家自然科学基金资助项目(No.11204220,No.61273053)
【分类号】：TN929.1

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