Optical waveguides – With optical coupler – Particular coupling structure
Patent
1998-06-17
2000-10-17
Spyrou, Cassandra
Optical waveguides
With optical coupler
Particular coupling structure
385 31, 385 33, 385 32, 385 37, 385 39, 385 38, 359115, G02B 626
Patent
active
061343617
ABSTRACT:
The present invention is related to an optical multiplexer/demultiplexer that has a wide wavelength passing band. This optical multiplexer/demultiplexer includes a substrate formed from a material with a uniform refractive index, a first and a second waveguide which are mounted to the substrate and are formed from a material with a refractive index higher than the substrate, and a directional coupler that is formed by placing each portions the first and second waveguides in close proximity to each other at a preselected length. Each of the portions of the first and second waveguides which are in close proximity are bisected into an upper region and a lower region in the one direction the light waves propagate. The propagation constant of the upper region of the first waveguide is set to be higher than the other portion and the propagation constant of the lower region of the second waveguide is set to be higher than the other portion. This allows expansion of the wavelength passing band.
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Norio Takato et al., "Silica-Based Single-Mode Waveguides on Silicon and their Application to Guided-Wave Optical Interferometers", Journal of Lighwave Technology, vol. 6, No. 6, Jun. 1988, pp. 1003-1010.
Toshimi Kominato et al., "Guide-Wave Optical WDM Circuits with Mach-Zehnder Interferometer Configuration", Electron Information Transmission Journal C-I, vol. J73-C-I, No. 5, 1990, pp. 354-359.
NEC Corporation
Sikd-er Mohammad Y.
Spyrou Cassandra
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