| 摘要 |
A waveguide-type optical multiplexer/demultiplexer with low crosstalk characteristics and reduced wavelength dispersion is provided. A waveguide-type optical multiplexer/demultiplexer comprising, first, second and third optical multiplexer/demultiplexer circuits connected in, multistage, each multiplexer/demultiplexer circuit has four input-output ports, third input-output pork of first optical multiplexer/demultiplexer circuit is connected to third input-output port of second optical multiplex/demultiplexer circuit, and fourth input-output port of first optical multiplexer/demultiplexer circuit is connected to fourth input-output port of third optical multiplexer/demultiplexer circuit, when wavelength division multiplex signals having wavelength .lambda.1, .lambda.2, .lambda.3, .lambda.4, .lambda.5, .lambda.6 ... are input through first input-output port of first optical multiplexer/demultiplexer circuit, multiplex signals of odd wavelength .lambda.1, .lambda.3, .lambda.5 ... are output from first input- output port of second optical multiplexer/demultiplexer circuit, and multiplex signals of even wavelength .lambda.2, .lambda.4, .lambda.6 ... are .out.put from first input-output port of third optical multiplexer/demultiplexer circuit.
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