Waveguide-type optical multiplexer/demultiplexer

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 port of first optical multiplexer/demultiplexer circuit is connected to third input-output port of second optical multiplexer/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 lambda₁, lambda₂, lambda₃, lambda₄, lambda₅, lambda₆ . . . are input through first input-output port of first optical multiplexer/demultiplexer circuit, multiplex signals of odd wavelength lambda₁, lambda₃, lambda₅ . . . are output from first input-output port of second optical multiplexer/demultiplexer circuit, and multiplex signals of even wavelength lambda₂, lambda₄, lambda₆ . . . are output from first input-output port of third optical multiplexer/demultiplexer circuit.