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Coupling characteristics of dual-core photonic crystal fiber couplers

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Abstract

Coupling characteristics of dual-core photonic crystal fiber (PCF) couplers are evaluated by using a vector finite element method and their application to a multiplexer-demultiplexer (MUX-DEMUX) based on PCF is investigated. The PCF couplers for 1.48/1.55-µm, 1.3/1.55-µm, 0.98/1.55-µm, and 0.85/1.55-µm wavelength MUX-DEMUX are designed and the beam propagation analysis of the proposed PCF couplers is performed. It is shown from numerical results that it is possible to realize significantly shorter MUX-DEMUX PCFs, compared to conventional optical fiber couplers.

©2003 Optical Society of America

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Figures (8)

Fig. 1.
Fig. 1. Cross section of PCF surrounded by PMLs.
Fig. 2.
Fig. 2. Curvilinear hybrid edge/nodal element.
Fig. 3.
Fig. 3. Cross sections of PCF couplers of (a) Type 1 and (b) Type 2.
Fig. 4.
Fig. 4. Coupling lengths of PCF couplers with d/Λ=0.5.
Fig. 5.
Fig. 5. Hole-pitch dependence of coupling lengths, taking the value of d/Λ as a parameter.
Fig. 6.
Fig. 6. Hole-pitch dependence of coupling lengths for PCF coupler with d/Λ=0.7, taking the operating wavelength as a parameter.
Fig. 7.
Fig. 7. d/Λ-dependence of coupling-length ratios, where λ1=1.55 µm.
Fig. 8.
Fig. 8. Demultiplexing characteristics of PCF couplers.

Tables (2)

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Table 1. PML parameters.

Tables Icon

Table 2. Parameters of photonic crystal fiber couplers, where λ1=1.55 µm.

Equations (7)

Equations on this page are rendered with MathJax. Learn more.

× ( [ s ] 1 × E ) k 0 2 n 2 [ s ] E = 0
[ s ] = [ s y s x 0 0 0 s x s y 0 0 0 s x s y ]
s i = 1 j α i ( ρ t i ) 2
[ K ] { E } = β 2 [ M ] { E }
L = π β e β o .
L λ 1 : L λ 2 = even : odd
L λ 1 : L λ 2 = odd : even .
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