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Single-mode fused biconical coupler optimized for polarization beamsplitting

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2 Author(s)
M. Eisenmann ; Daimler-Benz AG, Ulm, Germany ; E. Weidel

A single-mode fused biconical coupler for polarization beamsplitting is described. In the coupling region, standard communication fibers are used. The output fibers are polarization-maintaining. To stop the coupler drawing process accurately, the degree of polarization is measured during the drawing and is used as a criterion. Losses of 0.2 dB are typical, and a minimum extinction ratio of -27 dB is achieved. A usable spectral window as broad as 17 nm with an extinction ratio smaller than -15 dB for both output fibers is obtained. Any specified wavelength for the minimum of the extinction ratio is reached within ±3 nm

Published in:

Journal of Lightwave Technology  (Volume:9 ,  Issue: 7 )