利用DFB激光器非线性的高线性射频光传输链路  

Highly linear microwave photonic link based on nonlinearity of DFB laser

作　　者：康子建 谷一英[1] 朱文武[1] 范峰[1] 胡晶晶[1] 赵明山[1] 

机构地区：[1]大连理工大学物理与光电工程学院,辽宁大连116023

出　　处：《红外与激光工程》2016年第8期51-55,共5页Infrared and Laser Engineering

基　　金：中央高校基本科研业务费专项资金(DUT14RC(3)057);科技部国际合作项目(2014DFG32590);国家863计划(2012AA040406);辽宁省自然科学基金(2014020002)

摘　　要：提出了一种利用分布反馈DFB(Distributed Feedback laser)激光器的非线性对射频光传输系统动态范围进行优化的方案。实验研究了半导体分布反馈激光器的非线性,基于实验结果分析了DFB激光器的偏置电流与线性性能的关系。在此基础上建立了对马赫曾德外调制(Mach-Zehnder modulator,MZM)射频光传输系统线性优化方案。实验结果表明,该实验系统有效抑制了系统三阶交调量,系统的动态范围得到改善,当输入射频信号中心频率4 GHz,双音号间隔10 k Hz时,三阶交调失真抑制23.1 d B,无杂散动态范围提高8.68 d B。A scheme of dynamic range optimization for Microwave Photonic Link with Distributed Feedback laser （DFB） was proposed. The nonlinearity of the laser was experimentally studied. The relationship between the bias current and the linear performance of the DFB laser was analyzed experimentally. Based on the experimental results, the linear system of Mach-Zehnder modnlator（MZM） system was established. The experimental results show that the third order intermodulation of the system is suppressed, when the center frequency of the input frequency signal is 4 GHz and two tone separation is 10 kHz, the three order distortion is suppressed 23.1 dB and the spurious-free dynamic range can be improved by 8.68 dB.

关 键 词：分布反馈激光器 三阶交调 微波光纤传输 无杂散动态范围 

分 类 号：TN29[电子电信—物理电子学]