光采样模数转换系统的幅度控制及测试  

Amplitude control and test of optical sampling photonic analog to digital conversion system

作　　者：胡腾[1] 陶世兴[1] 温伟峰[1] 李建中[1] 王竞[1] 彭其先[1] 李泽仁[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2014年第9期104-108,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金仪器专项项目(069830)

摘　　要：针对2×2光采样时分复用系统幅度不稳定的特性进行了分析,结果表明幅度不稳定来自于两个方面:一是由于复用系统每一级的两路插入损耗不同,时分复用系统每一级的插损不均匀性造成的幅度抖动会逐级累加,从而系统对于每一级两路插入损耗一致性有比较高的要求;二是由于复用过程中的路径多样性造成了脉冲之间的偏振态互不相同,而电光调制器偏振敏感的特性使得采样系统难以正常工作。针对上述两个原因,采用衰减器与偏振控制器对脉冲幅度及偏振态进行精密调节,使幅度不一致性得到有效控制,并通过模拟信号采样测试了该系统的性能。实验结果表明,系统有效比特数为2.35bits。The amplitude unstability of the 2×2optical sampling time division multiplexing systems is investigated.The unstability comes from two aspects:insertion loss differences and various polarization states.Amplitude jitter results from the uneven insertion loss of each level and accumulates step by step.The system requires high insertion loss consistency.Various polarization states are caused by the path diversity.The sampling system can not function properly due to the polarization sensitivity of the electrooptical modulator.To solve the above problems,attenuators and polarization controller are applied to regulating and controlling the amplitude and polarization state of the pulse precisely.The performance is tested through analog signal sampling.The experimental result indicates that the effective number of bits is 2.35 bits.

关 键 词：光采样 时分复用 模数转换 幅度 偏振控制 

分 类 号：O439[机械工程—光学工程]