Optical waveguides – With optical coupler – Particular coupling structure
Patent
1991-04-15
1992-11-17
Gonzalez, Frank
Optical waveguides
With optical coupler
Particular coupling structure
385 43, G02B 626
Patent
active
051650010
ABSTRACT:
A guided-wave optical branching device having optical waveguides disposed on a substrate. The waveguides are partially arranged to be close to each other to form a tapered directional coupler in which the waveguides are point symmetrical or line symmetrical. Alternatively, the waveguides are neither line symmetrical nor point symmetrical. The tapered directional coupler reduces the wavelength dependence of the coupling ratio of the output power derived from the branching device. The widths of the waveguides in the parallel coupling region, the length of the coupling region in the symmetrical or asymmetrical directional coupler, the asymmetrical parameters or the like are set at values determined in accordance with the wavelength range used, so that the wavelength dependence of the coupling ratio of the power between the input port and the output port is reduced in a desired wavelength range, for example, 1.2 .mu.m-1.8 .mu.m.
REFERENCES:
patent: 3850503 (1974-11-01), Riseberg et al.
patent: 4669816 (1987-06-01), Thompson
patent: 5044715 (1991-09-01), Kawachi et al.
"Analysis of the Coupling Characteristics of a Tapered Coupled Waveguide System," Cai et al., Journal of Lightwave Technology, vol. 8, No. 1, Jan. 1990, pp. 90-98.
"Analysis of the Coupling Characteristics of a Tapered Three-Guide Coupled System," Cai et al., Journal of Lightwave Technology, vol. 8, No. 10, Oct. 1990, pp. 1621-1629.
"Broadband Silica-Based Optical Waveguide Coupler with Asymmetric Structure", Electronics Letters, Jan. 18, 1990, vol. 26, No. 2, pp. 132-133.
"Silica-Based Single-Mode Waveguides on Silicon and their Application to Guided-Wave Optical Interferometers", Takato et al., Journal of Lightwave Technology, vol. 6, No. 6, Jun. 1988, pp. 1003-1010.
Jinguji Kaname
Kawachi Masao
Takagi Akihiro
Gonzalez Frank
Nippon Telegraph and Telephone Corporation
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