Prism-coupling of light into narrow planar optical waveguides

W.A. Pasmooij, P.A. Mandersloot, M.K. Smit

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The efficiency and selectivity of the prism-coupler for exciting single modes in narrow planar optical waveguides is investigated both theoretically and experimentally. A previously published calculation of the coupling efficiency between a plane input wave with finite cross section and a number of waveguide modes, as a function of both the incidence angle and the skew angle, is extended to include the effects of diffraction, which are shown to play a dominant role for small focal widths of the input beam. The theoretical predictions are compared with experimental results obtained at 633 nm on an embedded ridge-type waveguide structure. A number of mechanisms reducing coupling selectivity and stability are discussed, and some practical rules are given for obtaining good stability and selectivity
Original languageEnglish
Pages (from-to)175-180
JournalJournal of Lightwave Technology
Issue number1
Publication statusPublished - 1989


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