Planar waveguide circuit comprising a 90 degree optical hybrid and optical receiver

摘要

A planar waveguide circuit (50) comprises a first optical splitter (52) to receive an input optical signal, a second optical splitter (54) to receive a reference optical signal, a first optical signal combiner (56), and a second optical signal combiner (58). First and second optical waveguides (60, 62) are provided to couple first and second outputs of the first optical splitter to respective inputs of the first and second optical signal combiners. Third and fourth optical waveguides (64, 66) are provided to couple first and second outputs of the second optical splitter to respective inputs of the first and second optical signal combiners. A phase-shifter (48) is provided located to affect the phase of an optical signal propagating in one of the third and fourth optical waveguides. The first and second optical splitters and the first and second optical signal combiners are arranged such that the first, second, third and fourth optical waveguides do not intersect one another.