光学精密工程2017，Vol.25Issue(2)：334-341,8.DOI:10.3788/OPE.20172402.0334
本振功率对空间平衡探测器相干探测灵敏度的影响
Influence of local oscillator power on sensitivity of coherent detection of space balance detector
摘要
Abstract
To explore the relationship between the local oscillator power and the coherent detection sensitivity in free-space coherent optical communications,the mathematical model about the influence of the local oscillator power on the sensitivity of coherent detection was established,and the effect of local oscillator power on the sensitivity of coherent detection under different parameters was simulated.The coherent detection sensitivity testing system was set up by using the high-speed and large-area space-coupling balanced detector produced from Wuhan University,then the effect of the local oscillator power on the detection sensitivity was verified experimentally.The experimental results show that the detection sensitivity is always affected by the intensity noise of the local oscillator due to the dismatch of the two photodiodes in the coherent detection system;thus there exist an optimal local oscillator power which can realize the maximum value of coherent detection sensitivity with certain environment parameters of the detector.When the bit error rate is 10-12 and the communication rate is 5 Gbps,the maximum value of the coherent detection sensitivity in the test is-40.16 dBm and the corresponding optical power is 9 dBm.The proposed model has an guiding significance for the improvement of detection sensitivity of coherent detection systems.关键词
相干光通信/平衡探测器/噪声抑制/灵敏度/本振功率Key words
coherent optical communication/balanced detector/noise suppression/sensitivity/local oscillator power分类
信息技术与安全科学引用本文复制引用
梁赫西,代永红,艾勇,单欣,武强..本振功率对空间平衡探测器相干探测灵敏度的影响[J].光学精密工程,2017,25(2):334-341,8.基金项目
国家自然科学基金资助项目(No.11204220,No.61273053) （No.11204220,No.61273053）
