Ultra narrow flat-top filter based on multiple equivalent phase shifts
Instead of real phase shifts, equivalent phase shifts (EPS) are adopted to construct ultra narrow phase-shifted band-pass filer in sampled Bragg gratings (SBG). Two optimized distributions of multiple equivalent phase shifts, using 2 and 5 EPSs respectively, are given in this paper to realize flat-top and ripple-free transmission characteristics simultaneously. Also two demonstrations with 5 EPSs both on hydrogen-loaded and photosensitive fibers are presented and their spectrums are examined by an optical vector analyzer (OVA). Given only ordinary phase mask and sub-micrometer precision control, ultra-narrowband flat-top filters with expected performance can be achieved flexibly and costeffectively.
Band-pass filters phase-shifted equivalent phase shift sampled Bragg gratings
Fei Wang Xihua Zou Zuowei Yin Xiangfei Chen Haisong Shen
Microwave-Photonics Technology Laboratory,National Laboratory of Microstructures,NanjingUniversity,N School of Information Science and Technology,Southwest Jiaotong University,Chengdu 610031,P.R.China
国际会议
2008亚太光通信会议(Asia-Pacific Optical Communications 2008)
杭州
英文
2008-10-26（万方平台首次上网日期，不代表论文的发表时间）