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Prism-coupling of light into narrow planar optical waveguides

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3 Author(s)
W. A. Pasmooij ; Dr. Neher Lab., Leidschendam, Netherlands ; P. A. Mandersloot ; M. K. Smit

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.<>

Published in:

Journal of Lightwave Technology  (Volume:7 ,  Issue: 1 )