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Spot-size conversion and near-circular far-field profile for efficient laser-fiber coupling

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4 Author(s)
Rahman, B.M.A. ; Dept. of Electr. Electron. & Inf. Eng., City Univ., London, UK ; Wongcharoen, T. ; Rajarajan, M. ; Grattan, K.T.V.

When a photonic integrated circuit (PIC), incorporating active devices, producing a small and noncircular spot-size is directly butt-coupled to single mode fiber (SMF) with a larger and circular spot-size, use of this arrangement can cause typically a 10 dB (or 90% power) loss. In this presentation, an approach of using two non-identical but phased matched uniform coupled waveguides is considered, to achieve the necessary spot-size conversion where such a system can be easily fabricated by using standard techniques

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Lasers and Electro-Optics Society 2000 Annual Meeting. LEOS 2000. 13th Annual Meeting. IEEE  (Volume:2 )

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