Abstract
We have used an asymmetric x-junction (ASX) as a polarization-independent sum and difference beam combiner. This component is integrable with adiabatic polarization splitters to build a fully passive integrated front end for a polarization-diversity coherent optical receiver.1 The advantage of the adiabatic junction device over directional coupler (DC) beam combiners is tire absence of a strict interaction length required for balanced separation.
© 1991 Optical Society of America
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