OPTICAL MULTIPLEXER/DEMULTIPLEXER, OPTICAL INTEGRATED CIRCUIT AND LIGHT TRANSCEIVER USING THE SAME, ESPECIALLY REDUCING IN SIZE WITH SAME OPTICAL ISOLATION CHARACTERISTIC

摘要

PURPOSE: An optical multiplexer/demultiplexer, an optical integrated circuit and a light transceiver using the same are provided to reduce in size with an improved optical isolation characteristic without increasing the P-S wavelength difference. CONSTITUTION: An optical multiplexer/demultiplexer(11) includes a pair of first cores(15,16) and a second core(17). The first cores and the second core are arranged in an optical waveguide. One end surface of the first core is arranged in opposed relation to a filter, the second core is arranged on the same side of the filter as the first core in such a manner as to optically coupled to the first core through the filter. And, at least a part of the first core is curved in a manner protruded toward the second core.