US5069561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithically integrated ridge waveguide semiconductor optical preamplifier
Assignee: Verizon Laboratories Inc
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Filing: 1990-07-24
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Granted: 1991-12-03
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Expires: 2010-07-24
Abstract
Abstract A monolithically integrated optical preamplifier comprises an amplifying region, an optical detection region for detecting amplified light, and an optically transparent and electrically insulating isolation region interposed between the amplifying and optical detection regions. The amplifying region achieves reduced facet reflectivity by being designed to have a large spot size, single-traverse mode waveguide amplifier oriented at an angle with respect to a crystal plane through the preamplifier. The isolation region is preferably an air gap.
Inventors
- 👤 William C. Rideout
- 👤 Roger P. Holmstrom
- 👤 Elliot Eichen
- 👤 William Powazinik
- 👤 Joanne LaCourse
- 👤 John Schlafer
- 👤 Robert B. Lauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:30
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/50; H01S5/02; H01S5/026; H01S5/0262; H01S5/0264
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
93 words
A wide-bandwidth monolithically integrated optical preamplifier for amplifying and detecting an input optical signal, comprising: an amplifying region including a large spot size, single-transverse mode traveling wave amplifier having an active layer for receiving said input signal, wherein said amplifier is oriented at an angle with respect to a crystal plane through said preamplifier; an optical detection region having an absorbing layer for detecting said amplified light; and an air gap electrical isolation region interposed between said amplifying and optical detection regions, and having a depth below the active layer of said amplifier.
Claim 2
Dependent Claim
93 words
A wide-bandwidth monolithically integrated optical preamplifier for amplifying and detecting an input optical signal, comprising: an amplifying region including a large spot size, single-transverse mode traveling wave amplifier having an active layer for receiving said input signal, wherein said amplifier is oriented at an angle with respect to a crystal plane through said preamplifier; an optical detection region having an absorbing layer for detecting said amplified light; and an air gap electrical isolation region interposed between said amplifying and optical detection regions, and having a depth below the active layer of said amplifier.
Claim 3
Dependent Claim
22 words
The preamplifier as recited in claim 1 wherein said amplifying region includes a ridge waveguide oriented at 7° from said crystal plane.
Claim 4
Dependent Claim
25 words
The preamplifier as recited in claim 2 wherein said ridge waveguide includes an active layer of InGaAsP emitting light at a wavelength of 1.31 microns.
Claim 5
Dependent Claim
15 words
The preamplifier as recited in claim 1 wherein said optical detection region includes a photodetector.
Claim 6
Dependent Claim
14 words
The preamplifier as recited in claim 4 wherein said photodetector consists of regrown InGaAs.
Claim 7
Dependent Claim
18 words
The preamplifier as recited in claim 3 wherein said air gap isolation region has width of 2 microns.
Claim 8
Dependent Claim
95 words
A wide-bandwidth monolithically integrated optical preamplifier for amplifying and detecting an input optical signal, comprising: an amplifying region including a large spot size, single-transverse mode traveling wave amplifier having an active layer for receiving said input signal, wherein said amplifier is oriented at an angle with respect to a crystal plane through said preamplifier; an optical detection region having an absorbing layer for detecting said amplified light; and an optically transparent and electrically insulating isolation region interposed between said amplifying and optical detection regions, and having a depth below the active layer of said amplifier.
Claim 9
Dependent Claim
95 words
A wide-bandwidth monolithically integrated optical preamplifier for amplifying and detecting an input optical signal, comprising: an amplifying region including a large spot size, single-transverse mode traveling wave amplifier having an active layer for receiving said input signal, wherein said amplifier is oriented at an angle with respect to a crystal plane through said preamplifier; an optical detection region having an absorbing layer for detecting said amplified light; and an optically transparent and electrically insulating isolation region interposed between said amplifying and optical detection regions, and having a depth below the active layer of said amplifier.
Claim 10
Dependent Claim
22 words
The preamplifier as recited in claim 7 wherein said amplifying region includes a ridge waveguide oriented at 7° from said crystal plane.
Claim 11
Dependent Claim
25 words
The preamplifier as recited in claim 8 wherein said ridge waveguide includes an active layer of InGaAsP emitting light at a wavelength of 1.31 microns.
Claim 12
Dependent Claim
15 words
The preamplifier as recited in claim 7 wherein said optical detection region includes a photodetector.
Claim 13
Dependent Claim
14 words
The preamplifier as recited in claim 10 wherein said photodetector consists of regrown InGaAs.
Claim 14
Dependent Claim
17 words
The preamplifier as recited in claim 9 wherein said isolation region has a width of 2 microns.
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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) | 1994-12-02 | 1995-06-03 | 1995-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-02 | 1999-06-03 | 1999-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-02 | 2003-06-03 | 2003-12-03 | $7700.00 | Window Closed / Lapsed |