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Confinement factors and gain in optical amplifiers

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4 Author(s)
Visser, T.D. ; Dept. of Phys. & Astron., Free Univ., Amsterdam, Netherlands ; Blok, H. ; Demeulenaere, B. ; Lenstra, D.

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

Published in:

Quantum Electronics, IEEE Journal of  (Volume:33 ,  Issue: 10 )