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The group index for TE modes in an asymmetrical slab waveguide is investigated, and a simple analytical expression is derived. It is shown that the product of the phase and group indices is related to the power fraction in each of the three layers of the waveguide. The results are of interest in the analysis of double heterostructure semiconductor lasers.compared.Theoretical and experimental results for lasers emitting at 1.55 microm are compared.
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J. Buus (1980) studied this question.
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