高频CO_2激光脉冲写入的新型长周期光纤光栅及其在光通信中的应用  

Novel long-period fiber gratings written by high-frequency CO_2 laser pulses and their applications in optical fiber communication

作　　者：饶云江[1] 朱涛[1] 冉曾令[1] 王义平[1] 江建[1] 

机构地区：[1]重庆大学光电工程学院,重庆400044

出　　处：《通信学报》2004年第10期75-86,共12页Journal on Communications

基　　金：国家杰出青年科学基金资助项目(60025515)

摘　　要：报道了一种利用频率为几千赫兹的高频 CO2激光脉冲的热冲击效应制作长周期光纤光栅的新技术。实验中,作者首次发现这种新型的长周期光纤光栅具有一些独特的光学特性,比如弯曲特性和横向负载特性等,这主要是因为用高频 CO2激光脉冲写成的长周期光纤光栅的横截面折射率分布不对称所致。基于这种新型长周期光纤光栅,设计了一种用于减小掺铒光纤放大器噪声系数的 ASE 噪声滤波器和平坦掺铒光纤放大器增益谱的增益均衡器,此外,还利用这种新型长周期光纤光栅独特的弯曲和压力特性,研究设计了两种用于动态平坦掺铒光纤放大器增益谱的动态增益均衡器。It was report that novel long-period fiber gratings (LPFG) fabricated by using a new method for writing technique that was mainly based on the thermal shock effect of focused high-frequency CO2 laser pulses at several kHz. Several unique characteristics of these LPFG, such as bend and transverse-load, were observed by experiments, for the first time, to our knowledge. These unique features of the LPFG were mainly due to the asymmetrical distribution of the refractive index on the cross-section of the LPFG induced by high-frequency CO2 laser pulses. Based on these novel LPFG, an amplified spontaneous emission (ASE) noise filter and a gain equalizer had been demonstrated for the noise figure reduction and the gain spectrum flattening of Er-doped fiber amplifiers (EDFA), respectively. By means of the unique bending and loading features of the LPFG, two tunable gain equalizers had been demonstrated for dynamic gain flattening of EDFA.

关 键 词：光纤通信技术 长周期光纤光栅 掺铒光纤放大器 ASE噪声滤波器 动态增益均衡器 

分 类 号：TN253[电子电信—物理电子学]