空间光耦合平衡探测器设计与测试

发布时间：2019-02-11 11:27

【摘要】：星地空间相干光通信中,受大气湍流及空间光耦合效率因素的影响,要实现高速率、高探测灵敏度的通信变得异常困难。针对星地空间相干光通信链路中空间光耦合较难的问题,提出了采用大面积平衡探测器来提高探测灵敏度的方法。通过分析平衡探测技术的原理及平衡探测器结构,设计了一种探测面直径为100μm、工作速率为5 Gbps的平衡探测器,搭建了空间相干光通信测试平台。在5 Gbps通信速率下,探测器的直接探测灵敏度达到-18.6 dBm,相干探测灵敏度达到-43.89 dBm,共模抑制比高于38.5 dB。测试结果验证了该空间光耦合平衡探测器用于空间相干光通信的可行性。
[Abstract]:Due to the influence of atmospheric turbulence and space-light coupling efficiency, it is very difficult to achieve high rate and high detection sensitivity in space-to-ground coherent optical communication. Aiming at the difficult problem of space optical coupling in space-ground space coherent optical communication link, a method to improve detection sensitivity by using a large area balance detector is proposed. By analyzing the principle of balanced detection technology and the structure of balanced detector, a balanced detector with a diameter of 100 渭 m and a working rate of 5 Gbps is designed, and a testing platform for spatial coherent optical communication is built. At 5 Gbps communication rate, the direct detection sensitivity of the detector reaches -18.6 dBm, coherent detection sensitivity to -43.89 dBm, common-mode rejection ratio higher than 38.5 dB.. The test results verify the feasibility of the spatial optical coupling balance detector for spatial coherent optical communication.
【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;
【基金】：国家自然科学基金(61273053,11204220)
【分类号】：TN929.1

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