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Optical Engineering

Wavelength switchable multiwavelength actively mode-locked fiber-ring laser based on highly nonlinear photonic crystal fiber and multimode fiber Bragg grating
Author(s): Xiaohui Fang; Ping-Kong Alex Wai; Chao Lu; Xinhuan Feng
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Paper Abstract

A wavelength switchable multiwavelength actively mode-locked fiber-ring laser based on highly nonlinear photonic crystal fiber (PCF) and polarization-dependent mode coupling to multimode-fiber Bragg grating (MMFBG) is proposed. Twenty meters of highly nonlinear dispersion-shifted PCF (DS-PCF) is inserted into the fiber ring cavity to suppress gain competition through the four-wave-mixing (FWM) effect. A mode scrambler is attached to the multimode fiber (MMF) to introduce a polarization-dependent mode coupling to the MMFBG. Through changing polarization in the cavity, stable and switchable one-wavelength, two-wavelength (wavelength spacing of 0.8 and 2.4 nm), and three-wavelength simultaneously actively mode-locked optical pulse trains at a repetition rate of 5 GHz are obtained. We show that high nonlinearity introduced by the nonlinear PCF in the cavity can improve significantly supermode suppression ratio (SMSR) of the multiwavelength pulses generated and a sidemode suppression ratio (SMSR) of 58 dB is realized.

Paper Details

Date Published: 1 December 2008
PDF: 5 pages
Opt. Eng. 47(12) 124202 doi: 10.1117/1.3041768
Published in: Optical Engineering Volume 47, Issue 12
Show Author Affiliations
Xiaohui Fang, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Ping-Kong Alex Wai, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Chao Lu, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Xinhuan Feng, The Hong Kong Polytechnic Univ. (Hong Kong, China)


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