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Abstract

A surface-emitting optical amplifier having a generally circular waveguide and active region. The waveguide and active region match the shape of an optical fiber or other device for generating, transmitting, guiding, propagating, etc., an optical signal. For example, the shape of the waveguide and active region may be circular, elliptical, square, rectangular, or virtually any other required shape. By matching the shape of the waveguide and active region to the shape of the device to which the waveguide connects, coupling loss is reduced and polarization dependent loss is eliminated due to the symmetry of the active region. The reduction of the coupling loss also leads to an increase of the signal to noise ratio since the signal loss from the input coupling is directly reduced.

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First Claim