Optical waveguide substrate, an article comprising the same and

Details Optical waveguide substrate, an article comprising the same and Optical waveguide substrate, an article comprising the same and

Filed on

1995-02-10

Date issued

1997-04-29

Examiner

Lee, John D.

Patent Class

Optical waveguides

SubClass

Integrated optical circuit

Other Related Categories

385 40, 385 45, 385 47, G02B 626

Type

Patent

Status

active

Patent number

056257260

Description

ABSTRACT:
The optical waveguide substrate is provided with a branch-type optical waveguide. This optical waveguide is composed of a stem portion provided between one end face and the other end face of the optical waveguide substrate and a plurality of branch portions extending in parallel with the stem portion. The optical waveguide substrate is also provided with a reflecting means for reflecting light transmitted through the stem portion toward the branch portions. Preferably, the optical waveguide is provided with a dividing portion which is continued to both of the stem portion and the branch portions, and a turning portion for optically coupling the branch portion with the stem portion is provided in this dividing portion so that the light transmitted through the stem portion is reflected toward the branch portions at said turning portion. In an active-type optical waveguide device, light modulating electrodes for modulating the light propagating through the branch portions are provided along each branch portion. With these constitutions, the coupling process for coupling the end face of the optical waveguide and that of the optical fiber can be accomplished more easily than the conventional one. Also, even when ambient temperature is largely changed after completion of the coupling between each optical fibers and waveguides through the coupling of the optical waveguide device and the optical fiber holding substrate, there hardly happens a change in the transmission loss of light. Moreover, it is also possible to reduce the length of the optical waveguide device.

REFERENCES:
patent: 4262995 (1981-04-01), Tangonan
patent: 4831631 (1989-05-01), Haeussler et al.
patent: 5111518 (1992-05-01), Okada
patent: 5191625 (1993-03-01), Gustavsson
patent: 5361157 (1994-11-01), Ishikawa et al.
Optical Engineering, vol. 28, No. 12, 1 Dec. 1989, pp. 1281-1287, Yasufumi Yamada et al: "Optical Interconnections Using a Silica-Based Waveguide on a Silicon Substrate."
Journal of Lightwave Technology, Jan. 1994, vol. 12, No. 1, pp. 44-48, Becker R. A. et al. "Rugged, low-cost pigtailing approach for LiNbO/sub 3/integrated optic devices".
Conference Proceedings of the 7th European Conference on Optical Communication, Copenhagen, Denmark, 8-11 Sep. 1981, pp. 9.2-1 ff., M.G.F. Wilson et al.: "A single mode stripe waveguide edge reflector for device integration".

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