US4952019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grating-coupled surface-emitting superluminescent device
Assignee: General Electric Co
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Filing: 1988-10-27
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Granted: 1990-08-28
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Expires: 2008-10-27
Abstract
Abstract A superluminescent diode has one end coupled to a DBR having a grating and the other end has a reflective coating. A broadlight spectrum is emitted for reduced speckle interference and phase noise when used in applications such as a gyroscope. The diode can be of the "P side down" type for good heat dissipation during continuous wave operation. Two gratings can be used in order to reduce beam divergence.
Inventors
- 👤 Gary A. Evans
- 👤 Nils W. Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:24
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/042; H01; H01S; H01S5/00; H01S5/10; H01S5/18; H01S5/185; H01S5/187
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
35 words
A device comprising: a superluminescent diode having a pair of ends; a reflecting coating disposed at one of said ends; and a distributed Bragg reflector having a first grating optically coupled to the other end.
Claim 2
Independent Claim
35 words
A device comprising: a superluminescent diode having a pair of ends; a reflecting coating disposed at one of said ends; and a distributed Bragg reflector having a first grating optically coupled to the other end.
Claim 3
Dependent Claim
13 words
The device of claim 1 wherein light is emitted directly from said grating.
Claim 4
Dependent Claim
13 words
The device of claim 1 wherein light is emitted directly from said diode.
Claim 5
Dependent Claim
13 words
The device of claim 1 wherein said diode is of the DH-LOC type.
Claim 6
Dependent Claim
13 words
The device of claim 1 wherein said diode is of the QW type.
Claim 7
Dependent Claim
10 words
The device of claim 1 wherein said grating is blazed.
Claim 8
Dependent Claim
14 words
The device of claim 1 further comprising a heat sink coupled to said diode.
Claim 9
Dependent Claim
16 words
The device of claim 1 further comprising a second grating optically coupled to said first grating.
Claim 10
Dependent Claim
17 words
The device of claim 8 wherein said gratings are in parallel and extend perpendicular to emitted light.
Claim 11
Dependent Claim
39 words
The device of claim 9 further comprising a waveguide optically coupled to said diode and having an effective index of refraction and a layer disposed over said second grating and having a higher index of refraction than said waveguide.
Claim 12
Dependent Claim
45 words
The device of claim 1 wherein said diode comprises an optical waveguide having an active length of L and a width of W and ##EQU3## wherein λ=wavelength of light in free space, d=grating period, and n e =effective index of refraction of said optical waveguide.
References Cited (Backward Citations)
US4092659A
Cited
US4286232A
Cited
US4317086A
Cited
JPS6066489A
Cited
JPS614290A
Cited
US4639922A
Cited
US4675873A
Cited
JPS61148890A
Cited
US4796273A
Cited
US4730331A
Cited
US4796274A
Cited
US4744088A
Cited
US4794618A
Cited
US4758090A
Cited
US4786132A
Cited
US4764934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |