US4528670A
Expired / Lapsed
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Short coupled cavity laser
Assignee: Nokia Bell Labs
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Filing: 1983-02-25
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Granted: 1985-07-09
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Expires: 2003-02-25
Abstract
Abstract Single longitudinal mode operation is achieved and maintained under CW and high speed (Gbps) current modulation conditions by a short coupled cavity laser including a short cavity semiconductor laser having two parallel mirror facets and a reflective surface spaced apart from and in predetermined relationship with one of the mirror facets. A short external cavity resonator is formed between the one mirror facet and the reflective surface. In general, the laser cavity length is related to the external cavity resonator length by the equation, nL=md, where nL is the effective optical length of the injection laser, d is the length of the external cavity resonator, and m is a positive number preferably between 2 and 10.
Inventors
- 👤 Charles A. Burrus, Jr.
- 👤 Chinlon Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:08
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/14; H01S3/00; H01S3/05; H01S3/08; H01S3/081; H01S3/082
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
89 words
In combination, a short cavity semiconductor laser having first and second substantially parallel facets for generating coherent light quanta in response to an applied signal, the light quanta exiting at least the first facet of the laser, and a reflective surface spaced apart from and in predetermined relationship with the first facet of the laser, so that the reflective surface and the first facet form an external cavity resonator therebetween, the short cavity semiconductor laser and the external cavity resonator have a combined length less than about 200 microns.
Claim 2
Dependent Claim
89 words
In combination, a short cavity semiconductor laser having first and second substantially parallel facets for generating coherent light quanta in response to an applied signal, the light quanta exiting at least the first facet of the laser, and a reflective surface spaced apart from and in predetermined relationship with the first facet of the laser, so that the reflective surface and the first facet form an external cavity resonator therebetween, the short cavity semiconductor laser and the external cavity resonator have a combined length less than about 200 microns.
Claim 3
Dependent Claim
20 words
The combination as defined in claim 1 wherein the external cavity resonator has a length d less than 100 microns.
Claim 4
Dependent Claim
21 words
The combination as defined in claim 2 wherein the external cavity resonator length d is between 30 microns and 80 microns.
Claim 5
Dependent Claim
21 words
The combination as defined in claim 1 wherein the short cavity semiconductor laser has a length L less than 100 microns.
Claim 6
Dependent Claim
17 words
The combination as defined in claim 4 wherein the length L is between 50 and 80 microns.
Claim 7
Dependent Claim
51 words
The combination as defined in claim 1 wherein the short cavity semiconductor laser has an effective optical length nL, the external cavity resonator has a length d, and both of the lengths are related as nL is substantially equal to md, where m is a positive number between 2 and 10.
Claim 8
Dependent Claim
94 words
In a coupled cavity laser, a semiconductor laser having first and second substantially parallel facets for generating light quanta in response to an applied signal, the light quanta exiting the first facet if the laser, and a reflective surface spaced apart from and in predetermined relationship with the first facet of the semiconductor laser, so that the reflective surface and the first facet form an external cavity resonator therebetween, the coupled cavity laser being characterized in that, a combined length of said semiconductor laser and the external cavity resonator is less than 200 microns.
Claim 9
Dependent Claim
94 words
In a coupled cavity laser, a semiconductor laser having first and second substantially parallel facets for generating light quanta in response to an applied signal, the light quanta exiting the first facet if the laser, and a reflective surface spaced apart from and in predetermined relationship with the first facet of the semiconductor laser, so that the reflective surface and the first facet form an external cavity resonator therebetween, the coupled cavity laser being characterized in that, a combined length of said semiconductor laser and the external cavity resonator is less than 200 microns.
Claim 10
Dependent Claim
22 words
The coupled cavity laser as defined in claim 7 wherein the external cavity resonator has a length between 30 and 80 microns.
Claim 11
Dependent Claim
51 words
The coupled cavity laser as defined in claim 7 wherein the semiconductor laser has an effective optical length nL, the external cavity resonator has a length d, and both of the lengths are related as nL being substantially equal to md, where m is a positive number between 2 and 10.
Claim 12
Dependent Claim
21 words
The coupled cavity laser as defined in claim 7 wherein the semiconductor laser has a length L less than 100 microns.
Claim 13
Dependent Claim
19 words
The coupled cavity laser as defined in claim 10 wherein the length L is between 50 and 80 microns.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |