US6052222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor optical amplifier
Assignee: NEC Corp
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Filing: 1997-12-19
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Granted: 2000-04-18
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Expires: 2017-12-19
Abstract
Abstract A semiconductor optical amplifier which has a good extinction ratio and a simple structure includes an optical waveguide having at least a curved portion. The optical waveguide has light input and output ends offset from each other to keep optical fibers out of alignment with each other at respective opposite ends of the optical waveguide.
Inventors
- 👤 Shotaro Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:53
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/50; H01S5/02; H01S5/026; H01S5/0265; H01S5/06; H01S5/062; H01S5/06209; H01S5/06213; H01S5/10; H01S5/1082; H01S5/1085; H01S5/12; H01S5/124; H01S5/1243
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
97 words
A semiconductor optical amplifier comprising; a substrate; and an active stripe formed and having at least a curved portion on said substrate, wherein a cross point of an input end axis and a line parallel to an output end facet deviates at least 20 μm from an output point on said output end facet; said active stripe having a bent shape with an input waveguide end and an output waveguide end being offset from each other; and further comprising a light shield formed between an extended axis of said input waveguide end and said output waveguide end.
Claim 2
Dependent Claim
97 words
A semiconductor optical amplifier comprising; a substrate; and an active stripe formed and having at least a curved portion on said substrate, wherein a cross point of an input end axis and a line parallel to an output end facet deviates at least 20 μm from an output point on said output end facet; said active stripe having a bent shape with an input waveguide end and an output waveguide end being offset from each other; and further comprising a light shield formed between an extended axis of said input waveguide end and said output waveguide end.
Claim 3
Dependent Claim
30 words
A semiconductor optical amplifier according to claim 1, wherein said active stripe has input and output waveguide ends offset from each other by a distance of at least 20 μm.
Claim 4
Dependent Claim
41 words
A semiconductor optical amplifier according to claim 1, wherein said curved portion of said active strips has an S-bent shape, said S-bent shape active stripe being formed such that said input and output waveguide ends are directed obliquely to device facets.
Claim 5
Dependent Claim
96 words
A semiconductor optical amplifier comprising; a substrate; an active stripe formed and having at least a curved portion on said substrate, wherein a cross point of an input end axis and a line parallel to an output end facet deviates at least 20 μm from an output point on said output end facet; said active stripe having a bent shape with an input waveguide end and an output waveguide end being offset from each other; and further comprising a light shield formed between an extended axis of said output waveguide end and said input waveguide end.
Claim 6
Dependent Claim
96 words
A semiconductor optical amplifier comprising; a substrate; an active stripe formed and having at least a curved portion on said substrate, wherein a cross point of an input end axis and a line parallel to an output end facet deviates at least 20 μm from an output point on said output end facet; said active stripe having a bent shape with an input waveguide end and an output waveguide end being offset from each other; and further comprising a light shield formed between an extended axis of said output waveguide end and said input waveguide end.
Claim 7
Dependent Claim
15 words
A semiconductor optical amplifier according to claim 3, wherein said light shield comprises a groove.
Claim 8
Dependent Claim
15 words
A semiconductor optical amplifier according to claim 4, wherein said light shield comprises a groove.
Claim 9
Dependent Claim
29 words
A semiconductor optical amplifier according to claim 5, wherein said light shield includes a portion extending to a depth of at least 4 μm from a substrate surface level.
Claim 10
Dependent Claim
29 words
A semiconductor optical amplifier according to claim 4, wherein said light shield includes a portion extending to a depth of at least 4 μm from a substrate surface level.
Claim 11
Dependent Claim
28 words
A semiconductor optical amplifier according to claim 5, wherein said groove includes a portion extending to a depth of at least 4 μm from a substrate surface level.
Claim 12
Dependent Claim
28 words
A semiconductor optical amplifier according to claim 6, wherein said groove includes a portion extending to a depth of at least 4 μm from a substrate surface level.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-04-18 | 2003-10-18 | 2004-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-18 | 2007-10-18 | 2008-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-18 | 2011-10-18 | 2012-04-18 | $7700.00 | Window Closed / Lapsed |