Abstract
Conventional couplers including the directional coupler and the self-imaging multimode interference coupler always produce a coupling phase to yield complementary power transfer functions when the relative phase of the two input fields changes. For applications in coupled-cavity lasers, a half-wave optical coupler with a coupling phase is required in order to produce synchronous output power for achieving high single-mode selectivity. We present the designs and optimization of half-wave couplers, including a three-waveguide directional coupler and a nonimaging multimode interference coupler.
© 2009 Optical Society of America
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