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Rigorous analysis of form birefringence of weakly fused fiber-optic couplers

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2 Author(s)
Tzong-Lin Wu ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Hung-Chun Chang

Based on a rigorous vectorial formulation, the surface integral equation method is used to solve the vectorial mode patterns and the coupling characteristics of weakly fused fiber-optic couplers. Form birefringence versus aspect ratio of the coupler cross-section for different normalized frequencies V are calculated. A dramatic feature-that there is a local maximum of form birefringence for the weakly fused couplers with large V-values-is found. The dependence of the aspect ratio at which the coupler is isotropic on the V-value is also presented. The fused coupler with large V-value is isotropic as the aspect ratio is close to 1.8, but its polarization effect is still significant when the aspect ratio is 2.0

Published in:

Journal of Lightwave Technology  (Volume:13 ,  Issue: 4 )