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Modal Solutions of Active Dielectric Waveguides by Approximate Methods

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2 Author(s)

Approximate methods are used to obtain the modal properties of stripe-contact semiconductor injection lasers using a planar three-layer waveguide model. The central active layer has a dielectric constant that varies smoothly along the direction parallel to the heterojunction boundaries. The complex dielectric constant under the stripe contact is dependent on the gain and approaches a constant value at large lateral distances. The two methods are compared in terms of their modal propagation constants. An application of the effective index method facilitates a physical understanding of dielectric waveguide modes as well as providing an efficient calculation procedure.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:30 ,  Issue: 12 )