Dopant diffusion loss mechanism in high-birefringent-fiber fused couplers

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The observation of dopant diffusion during the tapering of high-birefringent fibers that increases with initial modal birefringence is reported. The resulting reduction in the core-cladding index difference is postulated to result in an increased taper transmission loss and is shown to correspond to increased 3-dB fused-coupler insertion loss.