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Polarization-independent all-fiber multiwavelength-switchable filter based on a polarization-diversity loop configuration

Yong Wook Lee, Kyung Jun Han, Byoungho Lee, and Jaehoon Jung

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Abstract

In this paper a polarization-independent all-fiber multiwavelength-switchable filter based on a polarization-diversity loop configuration is newly proposed. The proposed apparatus consists of a polarization beam splitter, high birefringence fibers, and polarization controllers. Our theoretical analysis shows that the apparatus exhibits unique feature which allows it to operate as a polarization-independent multiwavelength periodic filter with a good channel isolation and to make its channel wavelength switchable by varying effective birefringence of the polarization-diversity loop through the proper adjustment of the polarization controllers contained within the loop. Theoretical prediction was experimentally verified.

©2003 Optical Society of America

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Figures (4)
Fig. 1. (a)
Fig. 1. (a) Basic structure of the PDLC-based all-fiber filter and (b) schematic of the propagating light path.

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Fig. 2.
Fig. 2. Schematic diagram of the proposed filter for channel wavelength-switching.

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Fig. 3.
Fig. 3. Calculated transmission spectrum of the proposed filter for channel wavelength-switching.

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Fig. 4.
Fig. 4. Measured transmission spectrum of the proposed filter for channel wavelength-switching.

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Tables (1)

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Table 1. Four optimal QWP combinations and corresponding intensities

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Equations (8)

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T CW = [ 1 0 0 0 ] R ( − π 4 ) [ e i Γ 2 0 0 e − i Γ 2 ] R ( π 4 ) [ 1 0 0 0 ] = [ cos ⁡ ( Γ 2 ) 0 0 0 ] ,
T CCW = [ 0 0 0 1 ] R ( π 4 ) [ e i Γ 2 0 0 e − i Γ 2 ] R ( − π 4 ) [ 0 0 0 1 ] = [ 0 0 0 cos ⁡ ( Γ 2 ) ]
E in = [ a b e j ϕ ]
E out = T CW · E in + T CCW · E in = cos ⁡ ( Γ 2 ) [ a b e j ϕ ] , I out = 1 2 ε 0 μ 0 ( ∣ a ∣ 2 + ∣ b ∣ 2 ) [ 1 + cos ⁡ ( Γ ) ]
T = [ 1 0 0 0 ] T QWP 2 ( θ 2 ) T QWP 1 ( θ 1 ) R ( − θ p ) [ e i Γ 2 0 0 e − i Γ 2 ] R ( θ p ) T HWP ( θ h ) [ 1 0 0 0 ]
+ [ 0 0 0 1 ] T HWP ( θ h ) R ( θ p ) [ e i Γ 2 0 0 e − i Γ 2 ] R ( − θ p ) T QWP 1 ( θ 1 ) T QWP 2 ( θ 2 ) [ 0 0 0 1 ]
TR = 1 2 + 1 2 { sin ⁡ [ 2 ( θ p − θ 2 − θ 1 ) ] cos 2 ( θ 1 − θ 2 ) − sin ⁡ [ 2 ( θ p + θ 2 − θ 1 ) ] sin 2 ( θ 1 − θ 2 ) } cos ⁡ ( Γ )
− 1 2 { sin ⁡ [ 2 ( θ 1 − θ 2 ) ] cos ⁡ ( 2 θ 2 ) } sin ⁡ ( Γ )
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