| 摘要 |
An optical wavelength multiplexer/demultiplexer of the present invention is such an optical wavelength multiplexer/demultiplexer capable of approximating, for instance, an optical transmission center wavelength to be multiplexed/demultiplexed to a designed wavelength in an easy manner, while transmission loss and adjacent crosstalk are low. Optical multiplexing/demultiplexing circuits (8(8A, 8B, 8C)) such as Mach-Zehnder optical interferometers having wavelength multiplexing/demultiplexing functions and formed by optical waveguides, are formed on substrates (1(1A, 1B, 1C)) different from each other, so that a plurality of optical waveguide circuit chips (7(7A, 7B, 7C)) are fabricated. These plural optical waveguide circuit chips (7(7A, 7B, 7C)) are connected to each other via an optical fiber (2). A temperature control means (5(5A, 5B, 5C)) is provided in each of the optical waveguide circuit chips (7(7A, 7B, 7C)), and the temperature control means controls a temperature of each of the optical waveguide circuit chips so as to adjust an optical transmission center wavelength of the corresponding optical multiplexing/demultiplexing circuit (8(8A, 8B, 8C)).
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