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Hybrid fiber grating-based optical comb filters with changeable channel numbers

XINYONG DONG1,* , LI-YANG SHAO1, P. SHUM2, C. C. CHAN3

Affiliation

  1. Institute of Optoelectronic Technology, China Jiliang University, Hangzhou, China, 310018
  2. Network Technology Research Centre, Nanyang Technological University, Singapore, 637553
  3. School of Chemical & Biomedical Engineering, Nanyang Technological University, Singapore, 639798

Abstract

An in-fiber Mach-Zehnder interferometer filter based on a pair of long-period fiber gratings (LPFGs) 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 from 1 to 5 and 3 to 9 have been achieved, respectively..

Keywords

Chirped fiber Bragg gratings, Long-period gratings, Optical fiber filters, Comb filters, Tunable filters.

Submitted at: June 22, 2009
Accepted at: July 23, 2009

Citation

XINYONG DONG, LI-YANG SHAO, P. SHUM, C. C. CHAN, Hybrid fiber grating-based optical comb filters with changeable channel numbers, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 7, pp. 1015-1019 (2009)