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Opt Express. 2009 Mar 30;17(7):5273-8.

Optical microfiber coupler for broadband single-mode operation.

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  • 1Optoelectronics Research Centre, University of Southampton, Southampton, UK.


We present a broadband single-mode bi-conical microfiber coupler (MFC) with a specifically designed transition region that effectively suppresses any higher-order modes present at the input fiber and provides efficient power splitting into the fundamental mode at the two output ports. As a practical example, single-mode 3-dB splitting operation over a broad spectral window (400 approximately 1700 nm) was demonstrated for a very thin taper waist approximately 1.5 microm) MFC made from conventional telecom optical fibers.

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