US5771322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-receiving structure for wave-guide type optical devices
Assignee: NEC Corp
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Filing: 1997-02-20
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Granted: 1998-06-23
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Expires: 2017-02-20
Abstract
Abstract A light receiving structure for waveguide type optical devices, which excels in productivity, is compactly formed and permits highly efficient coupling, is provided. A recess is provided in part of the surface of a substrate on which an optical waveguide is formed, and a light-receiving element is mounted on the recess, with its light-receiving face upward. Near the recess is formed an end face of the optical waveguide in advance, so that a light be emitted therefrom. On the other hand, over the substrate is arranged a cover in which a groove is formed in a position opposite to the optical waveguide and a reflector is formed in a position opposite to the light-receiving element. The light emitted from the optical waveguide is reflected by the reflector and coupled to the light receiving element. A through hole can be bored in the substrate in advance, so that the packaging density can be improved by mounting the light-receiving element with its light-receiving face toward the through hole and thereby mounting the light-receiving element on the under side.
Inventors
- 👤 Kiyoto Matsumoto
- 👤 Yasuhisa Tanisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:10
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4204; G02B6/4214; G02B6/4246
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
132 words
A light receiving structure for waveguide type optical devices, comprising: a waveguide substrate having a top surface and having a recess lower than said top surface; an optical waveguide formed directly on said waveguide substrate, said optical waveguide having an end face proximate to said recess; a light-receiving element having a receiving face arranged within said recess proximate to said end face of said optical waveguide, said receiving face being lower than said top surface of said waveguide substrate; and a reflector, having a reflective surface above said top surface of said waveguide substrate and a reflective surface below said top surface, arranged near the end face of said optical waveguide on said waveguide substrate, for reflecting light emitted from said end face to a light-receiving face of said light receiving element.
Claim 2
Dependent Claim
132 words
A light receiving structure for waveguide type optical devices, comprising: a waveguide substrate having a top surface and having a recess lower than said top surface; an optical waveguide formed directly on said waveguide substrate, said optical waveguide having an end face proximate to said recess; a light-receiving element having a receiving face arranged within said recess proximate to said end face of said optical waveguide, said receiving face being lower than said top surface of said waveguide substrate; and a reflector, having a reflective surface above said top surface of said waveguide substrate and a reflective surface below said top surface, arranged near the end face of said optical waveguide on said waveguide substrate, for reflecting light emitted from said end face to a light-receiving face of said light receiving element.
Claim 3
Dependent Claim
22 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 1, wherein said reflector is formed on a silicon substrate.
Claim 4
Dependent Claim
29 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 2, wherein said reflector comprises an inclined face formed on said silicon substrate by chemical anisotropic etching.
Claim 5
Dependent Claim
22 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 3, wherein a gold film is formed over said reflector.
Claim 6
Dependent Claim
19 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 1, wherein said reflector is concavely shaped.
Claim 7
Dependent Claim
21 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 5, wherein said reflector is formed of molded resin.
Claim 8
Dependent Claim
25 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 6, wherein said reflector is coated with a film having a gold surface.
Claim 9
Dependent Claim
19 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 1, wherein said waveguide substrate comprises silicon.
Claim 10
Dependent Claim
27 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 8, wherein said recess is formed by silicon chemical anisotropic etching of said waveguide substrate.
Claim 11
Dependent Claim
20 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 1, wherein said reflector is fastened by soldering.
Claim 12
Dependent Claim
52 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 1, further comprising a cover positioned over an upper face of said waveguide substrate, wherein said reflector is formed on a concavely shaped part of a cover and an external face of said cover is coated with a metallic film.
Claim 13
Dependent Claim
21 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 11, wherein said metallic film is made of brass.
Claim 14
Dependent Claim
22 words
A light-receiving structure for waveguide type optical devices, as claimed in claim 11, wherein a semiconductor laser is arranged on said substrate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-22 | 2001-12-22 | 2002-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-22 | 2005-12-22 | 2006-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-22 | 2009-12-22 | 2010-06-23 | $7700.00 | Window Closed / Lapsed |