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US 5,710,847 AGranted
Semiconductor optical functional device
AssigneeHitachi, Ltd.
InventorsHideaki Takano, Hirohisa Sano, Tatsuo Kanetake, Masaki Ohira, Makoto Suzuki, Hiroaki Inoue
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Abstract
To obtain an optical functional device such that the reflectivity of a facet and the loss of coupling with a fiber are reduced, a mode conversion region for changing the beam spot size is formed on the input facet and/or the output facet in an optical function region and the facet of the side to be connected with a fiber in the mode conversion region is formed obliquely to the direction of propagation of light.
Claims13
A semiconductor optical functional device comprising:
- an optical functional region;
- and
- a mode conversion region for increasing a beam size of propagated light on a facet in said optical functional region;
- wherein the facet of the side to be connected with a fiber in the mode conversion region is provided obliquely to the direction of propagation of light;
- and
- wherein said mode conversion region includes a waveguide and is formed so as to gradually change the size of said waveguide in the direction of propagation of light.
3 more elements
Dependencies are inferred from the claim text.