Abstract

In an active waveguide in which the refractive index of the inner part is smaller than that of the outer part, there is modal gain if the field-medium gain is higher than a threshold value that is a function of the refractive-index step. The threshold current density is shown to decrease as the refractive-index step increases. This behavior can be explained by considering the interplay between the creation of energy in the medium gain and lateral loss.

© 1990 Optical Society of America

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