Improvement on peak-to-trough ratio of sampled fiber Bragg gratings with multiple phase shifts  

作　　者：谢滨 潘炜 罗斌 邹喜华 

机构地区：[1]School of Information Science and Technology.Southwest Jiaotong University

出　　处：《Chinese Optics Letters》2008年第1期9-11,共3页中国光学快报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(No.10174057,90201011);the Key Project of Chinese Ministry of Education(No.105148);the Foundation of Key Laboratory of Optical Fiber Transmission;Communication Networks(No.KF2006)

摘　　要：Via a cascaded structure, the peak-to-trough ratio is considerably improved for sampled fiber Bragg gratings （SFBGs） based on multiple-phase-shift （MPS） technique. This cascaded filter is composed of two identical SFBGs which are inserted with the increasing or decreasing arrangement of phase shifts. With this inverse arrangement of MPS in grating design, the phase fluctuation of individual SFBG can be compensated, and as a result an excellent phase matching condition is realized. In this way, the peak-to- trough ratio in reflection spectra is improved from 6 to 12 dB when multiplication factor m = 4, and from 5dBto 10dBwhenm=8.Via a cascaded structure, the peak-to-trough ratio is considerably improved for sampled fiber Bragg gratings （SFBGs） based on multiple-phase-shift （MPS） technique. This cascaded filter is composed of two identical SFBGs which are inserted with the increasing or decreasing arrangement of phase shifts. With this inverse arrangement of MPS in grating design, the phase fluctuation of individual SFBG can be compensated, and as a result an excellent phase matching condition is realized. In this way, the peak-to- trough ratio in reflection spectra is improved from 6 to 12 dB when multiplication factor m = 4, and from 5dBto 10dBwhenm=8.

关 键 词：Light reflection Phase matching Phase shift 

分 类 号：O436[机械工程—光学工程]