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Optically controlled Sagnac loop comb filter

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Abstract

We propose a new type of dynamically tunable birefringence comb filter based on a semiconductor optical amplifier Sagnac loop interferometer. By optically modulating the birefringence of the amplifier, we demonstrate a tuning of the output wavelengths. The shift of wavelength increases monotonically with the power of the control light until saturation occurs. The tuning relation is independent of the comb spacing governed by the length and birefringence of the polarization maintaining fiber inside the loop. A tuning range up to 59% of the comb spacing has been achieved at 18.5 dBm input power.

©2004 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. Experimental setup. SOA : semiconductor optical amplifier; PMF : polarization maintaining fiber; PC1, PC2 : polarization controllers; OSA : optical spectrum analyzer.
Fig. 2.
Fig. 2. Transmission spectrum of the SOA-PMF loop mirror filter in the absence of the control light. (a) The length of the PMF is 6.7 m and the measured comb spacing is 1.2 nm. (b) The length of the PMF is 13.4 m and the measured comb spacing is 0.6 nm.
Fig. 3.
Fig. 3. Transmission spectra of the SOA Sagnac interferometer (a) with 6.7 m PMF before and after the application of a control light at 17.5 dBm. (b) with 13.4 m PMF before and after the application of a control light at 18.5 dBm
Fig. 4.
Fig. 4. Dependence of the wavelength shift on the control light injection power.
Fig. 5.
Fig. 5. Switching characteristic of the comb filter. (a) 10 GHz control data input “0101” at 1545.00 nm. (b) probe output at 1534.16 nm located at the transmission maximum when the control is “0”. (c) probe output at 1533.86 nm located at the transmission minimum when the control is “0”.

Equations (3)

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Δ λ = λ 2 B PMF L PMF
ϕ ( λ ) = 2 π λ B e L e
T ( λ ) = 1 2 ( 1 cos ( ϕ ( λ ) )
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