Oscillator Based on a Lyot
Sagnac Filter1
K. Hua, b, c, Y. Weia, b, c, B. Suna, b, c, T. Wange, and D. Chenc, d, *
a State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China
b Centre for Optical and Electromagnetic Research, Zhejiang University, Hangzhou 310058, China
c Joint Research Laboratory of Optics of Zhejiang Normal University and Zhejiang University, Zhejiang University,
Hangzhou 310058, China
d Institute of Information Optics, Zhejiang Normal University, Jinhua 321004, China
e College of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310000, China
*e-mail: daru@zjnu.cn
Received June 7, 2012
Abstract—We experimentally demonstrate a flexibly switchable multi-wavelength fiber optical parametric
oscillator (MW-FOPO) by employing a highly nonlinear dispersion-shifted fiber (HNL-DSF) as the gain
medium and a Lyot–Sagnac fiber ring as the comb filter. The wavelength spacing and the number of channels
in the switchable MW-FOPO are adjustable by controlling the effective length of polarization maintaining fiber
(PMF) segments in the intracavity Lyot–Sagnac filter. We achieve 36 lasing channels with 0.5 nm-spacing and
22 lasing channels with 0.8 nm-spacing in a wavelength range from 1541 to 1559 nm at room temperature. A
comparison of the output spectra between the dual-pump MW-FOPO and single-pump MW-FOPO is presented
as well.
10.1134/S1054660X12120134
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