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Date of Publication:2014-01-01

Journal:光学学报

Volume:34

Issue:3

Page Number:0306001

ISSN No.:0253-2239

Abstract:An optical comb filter based on the Sagnac ring loop is proposed. The
   comb filter response function is generated on the basis of the
   birefringent effect of the polarization maintaining fiber (PMF) within
   the loop. By utilizing the radio frequency (RF) signal along with the
   direct current (DC) to drive the phase modulator (PM) inserted in the
   Sagnac loop mirror, the independent tunings of the notch depth and
   filtering wavelength are realized. The response function of the proposed
   Sagnac filter is expressed theoretically with Jones matrix, and the
   effects of the optical filter notch depth and filtering wavelength on RF
   signal and the DC bias are analyzed. Based on the analysis results,the
   experimental link is set up to verify the theory. The results show that
   the tunable range of the notch depth from 0 dB to 30 dB is achieved.
   Besides, the filtering wavelength influenced by the DC from 0 to 12 V is
   continuously adjustable in the free spectral range (FSR) of 0. 5 nm, and
   the wavelength tuning efficiency is 0.043 nm/V.

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