%0 Journal Article
%T Hybrid Fiber Grating-based Optical Comb Filters with Changeable Channel Numbers<br>一种通道数可变的光纤光栅梳状滤波器
%A DONG Xin-yong
%A LI Lan
%A SHUM Ping
%A CHAN Chi-chiu
%A <br>董新永
%A 李岚
%A 沈平
%A 陈志超
%J 光子学报
%D 2010
%I 
%X An in-fiber Mach-Zehnder interferometer filter based on a pair of long-period fiber gratings (LPGs) has been operated in the reflection mode by incorporating a broadband chirped-fiber Bragg grating (CFBG) or an optical fiber mirror reflector. As a result, the extinction ratio has been nearly doubled and, by tuning chirp rate, i.e. reflection bandwidth of the CFBG using a beam-bending method, channel number of the formed optical comb filter can be easily changed. In our experiment, two comb filters with channel numbers being changed among odd ones from 1 to 5 and 3 to 9 have been achieved, respectively. Even channel filtering can also be achieved if the center wavelength of the chirped fiber grating is changeable.
%K Key words: long-period gratings
%K comb filters
%K tunable filters
%K Chirped fiber Bragg gratings<br>关键词：长周期光纤光栅
%K 梳状滤波器
%K 通道可调滤波器
%K 啁啾光纤光栅
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=9F6139E34DAA109F9C104697BF49FC39&aid=992DC6C46F63D31893B75AAD641FAE2A&yid=140ECF96957D60B2&vid=7C3A4C1EE6A45749&iid=0B39A22176CE99FB&sid=9CA95D22FC1D537C&eid=0C191C6ECF79047F&journal_id=1004-4213&journal_name=光子学报&referenced_num=0&reference_num=3