Nonreciprocal circuit for laser-diode-to-single-mode-fibre coupling employing a YIG sphere

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Abstract
A compact nonreciprocal optical circuit for laser-diode-to single-mode-fibre coupling using a YIG sphere is proposed in the 1.3 μm wavelength region. It is clarified that the YIG sphere can function as an effective Faraday rotator as well as a coupling lens. A high isolation value of more than 30 dB has been realised with coupling efficiency of −5.2 dB for a single-mode fibre.