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US5157756A
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Optical waveguide circuit with intersections
Assignee: NEC Corp
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Filing: 1990-08-30
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Granted: 1992-10-20
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Expires: 2010-08-30
Abstract
Abstract An optical waveguide circuit comprises intersections each including two optical waveguides which intersect with each other by a predetermined intersecting angle. The intersection includes an island region and a peripheral region surrounding the island region. The peripheral region has a refractive index which is lower than that of optical waveguides, so that an intersecting loss is lowered.
Inventors
- 👤 Hiroshi Nishimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:50
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/125; G02B6/24; G02B6/26; G02B6/28; G02B6/2804
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
An optical waveguide circuit with intersections, comprising: a plurality of single mode optical waveguides provided on a substrate; and intersections each provided by two single mode optical waveguides among said plurality of said single mode optical waveguides, said two single mode optical waveguides intersecting with each other by a predetermined intersecting angle; wherein each of said intersections includes an island region, and a peripheral region which is provided at a periphery of said island region, said peripheral region having a refractive index which is lower than that of said plurality of said single mode optical waveguides, and having a predetermined width to decrease an intersecting loss induced by mode conversion.
Claim 2
Dependent Claim
110 words
An optical waveguide circuit with intersections, comprising: a plurality of single mode optical waveguides provided on a substrate; and intersections each provided by two single mode optical waveguides among said plurality of said single mode optical waveguides, said two single mode optical waveguides intersecting with each other by a predetermined intersecting angle; wherein each of said intersections includes an island region, and a peripheral region which is provided at a periphery of said island region, said peripheral region having a refractive index which is lower than that of said plurality of said single mode optical waveguides, and having a predetermined width to decrease an intersecting loss induced by mode conversion.
Claim 3
Dependent Claim
32 words
An optical waveguide circuit with intersections, according to claim 1, wherein: said island region has a refractive index which is equal or proximate to that of said plurality of said optical waveguides.
Claim 4
Dependent Claim
30 words
An optical waveguide circuit with intersections, according to claim 1, wherein: said island region has a width so as to transmit light from said optical waveguides in a single mode.
Claim 5
Dependent Claim
33 words
An optical waveguide circuit with intersections, according to claim 1, wherein: said predetermined intersecting angle is an angle in a predetermined angle range, said predetermined angle range includes angles which exceed six degrees.
Claim 6
Dependent Claim
28 words
An optical waveguide circuit with intersections, according to claim 1, wherein: said peripheral region has a refractive index which is equal or proximate to that of said substrate.
Claim 7
Dependent Claim
32 words
An optical waveguide circuit with intersections, according to claim 1, wherein: said island region has a predetermined width which is equal or proximate to the width of said single mode optical waveguides.
References Cited (Backward Citations)
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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) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |