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An analysis of the coupling of an injection laser diode to a planar LiNbO3waveguide

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6 Author(s)
Mueller, C. ; Carnegie-Mellon University, Pittsburgh, PA, USA ; Sullivan, C. ; Chang, W.S.C. ; Hall, Dennis G.
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Calculated butt coupling efficiency between a GaAlAs double heterostructure laser and a single-mode LiNbO3Ti-diffused optical waveguide is presented in this paper as a function of the transverse displacement, the angular alignment, the longitudinal separation between the laser and the waveguide end surfaces, the radiation field of the laser diode and its dependence on the laser diode structure, and the mode profile of the waveguide and its dependence on experimental diffusion parameters. The maximum efficiency is less than 40 percent because of the mismatch between the waveguide mode and the laser radiation, caused primarily by the experimental limitations in their structures. The effect of the reflection of the waveguide end surface on the laser oscillation has also been estimated.

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Quantum Electronics, IEEE Journal of  (Volume:16 ,  Issue: 3 )