Confinement factors and gain in optical amplifiers

1997/01/01 by T.D. Visser, H. Blok, B. Demeulenaere +1 · 10 citations
Engineering · Physics and Astronomy · #Photonic and Optical Devices #Gyrotron and Vacuum Electronics Research #Semiconductor Lasers and Optical Devices

paper · doi:10.1109/3.631280

Abstract

A new identity is derived which relates the gain and the field distribution (or confinement factor) in a dielectric waveguide with complex refractive indices. This identity is valid for any guided mode of waveguides with an arbitrary cross section. It provides a new check of the accuracy of mode solvers. Also, it can be used in a variational approach to predict the gain or loss of a guided mode based on knowledge of confinement factors. It is shown that a previous analysis that is often used, is not correct. In addition, approximate expressions for the gain in slab waveguides are presented.

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