Optical isolator and optical amplifier waveguide device

Optical waveguides – With optical coupler – Particular coupling structure

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385 50, 385 37, 385 31, G02B 626

Patent

active

059785314

ABSTRACT:
It is the object of the invention to integrally conform functions of devices of optical fiber types with those of SiO.sub.2 waveguides, miniaturize optical devices and provide optical waveguide devices with various optical functions. A SiO.sub.2 waveguide, which is composed of a SiO.sub.2 waveguide clad with low refractive index and a SiO.sub.2 waveguide core with high refractive index, is formed on a Si substrate. The core and the clad on an area, where the direction of the core coincides with the orientation of crystallization of a Si substrate, are removed. A V-groove is formed along the orientation of crystallization of the exposed Si substrate. Both the end surfaces of an optical fiber grating, which is fitted in the V-groove, face those of the remaining SiO.sub.2 waveguide. The cores of the SiO.sub.2 waveguides and the optical fiber grating are optically coupled with each other.

REFERENCES:
patent: 5732170 (1998-03-01), Okude et al.
Japanese Office Action, dated Oct. 28, 1998, with English language translation of Japanese Examiner's comments.

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