高速光模-数转换关键技术  

Key techniques in high-speed photonic A/D conversion

作　　者：陈建平[1] 郭攀[1] 李铭[1] 吴龟灵[1] 

机构地区：[1]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200240

出　　处：《红外与激光工程》2010年第3期447-451,495,共6页Infrared and Laser Engineering

基　　金：国家863计划(2007AA01Z275)

摘　　要：采用光子学技术实现模-数(A/D)转换,可克服电子瓶颈的限制,大幅度提高采样率,满足宇宙探测、超宽带雷达等应用需求。研究了基于光纤的高速光A/D转换系统,针对被动锁模光纤激光器重复频率低的不足,提出了采用波分复用(WDM)和光时分复用(OTDM)相结合来提高采样脉冲频率的方法,阐述了其中的关键技术,实现了83.97Gs/s高速时间-波长交织光采样脉冲;分析了光纤色散对时钟抖动、进而对系统有效比特数的影响,给出了模拟计算结果;提出了减少色散影响的方法,通过自行研制的高精度机械式微拉伸器进行了色散补偿。实验结果验证了其有效性。Photonic technology is a promising way to be free from electronic bottleneck in implementing analog-to-digital （A/D） converters , which can be used in ultrahigh speed applications such as universe exploration, broadband radar, etc. A photonic A/D conversion system based on fiber optics was studied in this paper. In order to overcome the shortage of low repetition frequency of the pulse laser emitting from a passively mode-locked fiber laser, both the WDM and the OTDM approaches were proposed to generate the high-speed optical sampling clock signals, and the key problems in this approaches were described. A time-wavelength interweaved sampling pulse at 83.97 Gs/s was generated. The effects of optical fiber dispersion on the timing jitter as well as the effective number of bits were theoretically analyzed and simulated. The schemes to reduce the effects of the fiber dispersion were proposed and the dispersion was compensated by use of a high precision mechanically tunable stretcher. The experiments show the method is available.

关 键 词：光模-数转换 采样率 有效比特数 

分 类 号：TN929[电子电信—通信与信息系统]