Abstract
We investigate numerically and analytically the propagation characteristics
of gain-guided modes in index-antiguided planar waveguides. We show that the
gain-guided mode has modal confinement proportional to the modal gain, and
single-transverse mode propagation is very robust in such waveguides. The
power evolution of the fundamental mode can be described analytically with
very good accuracy. Limiting power and optimum length of the waveguide amplifiers
can also be obtained analytically.
© 2011 IEEE
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