光外差平衡检测与本振光强度噪声抑制研究  

Research on Balanced Optical Heterodyne Detection and Local Laser Intensity Noise Suppression

作　　者：何佶珂[1] 曾晓东[1] 

机构地区：[1]西安电子科技大学技术物理学院,陕西西安710071

出　　处：《电子科技》2010年第8期25-31,共7页Electronic Science and Technology

基　　金：国家863计划基金资助项目(2006AA12Z144)

摘　　要：对LD泵浦固体连续激光器强度噪声的来源与特征及光外差平衡接收技术进行了介绍。重点分析了平衡探测器两臂的幅度失配及相对传播时延对信号检测与噪声抑制的影响,最后进行了数值计算。结果表明,平衡探测器抑制强度噪声中的宽带噪声时,必须进行严格的相对延时控制。对于f-3 dB=884 MHz的幅度匹配平衡探测器,抑制宽带噪声30 dB的相对延时必须控制在55.3 ps以内。The origin and characteristics of LD pumped continuous-wave solid-state laser intensity noise and balanced optical heterodyne detection are introduced.The influence of amplitude mismatching and relative propagation time delay which exist in the two arms of balanced photodetector（BPD） on signal detection and noise suppression is closely analyzed.Finally,a numerical result is presented and it shows that rigid propagation time delay must be controlled to suppress wide-band noise and for a BPD with f-3 dB=884 MHz a relative time delay less than 55.3 ps must be guaranteed to suppress wide-band noise for 30 dB at least.

关 键 词：光外差 平衡检测 本振光 强度噪声 噪声抑制 

分 类 号：TN247[电子电信—物理电子学]