| 摘要 |
In an optical coupler of this invention, second and third single mode optical fibers are arranged to be parallel with each other with a first single mode optical fiber intervening therebetween, and a region in which the second and third optical fibers are linearly symmetrical with each other about the first optical fiber as the center is distribution-coupled. The coupling length of distributed coupling is set such that when the first and second light waves having a wavelength lambda 1 and a wavelength lambda 2 different from the wavelength lambda 1 are incident on one port of the first optical fiber, the first light wave is emitted from the other port of the first optical fiber and the second light wave is emitted from the second and third optical fibers.
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