EP0087220A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Laser light sources
Assignee: British Telecommunications PLC
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Filing: 1983-01-26
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Granted: —
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Expires: 2003-01-26
Abstract
Abstract A light source comprises a semiconductor laser (14) and a gas laser (10). The semiconductor laser (14) is injection locked using the highly coherent output from the gas laser. The output from the semiconductor laser has a narrow linewidth and a high stability. The invention has a major application in'optical fibre communications systems.
Inventors
- 👤 David William Smith
- 👤 Richard Wyatt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 18:09
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/40; H01S5/4006
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
43 words
-1 An injection locked laser light source (10-14) comprising a master laser (10) whose light output is coupled to a slave laser (14), characterised in that the master laser (10) is a gas laser and the slave laser (14) is a semiconductor laser.
Claim 2
Dependent Claim
24 words
2 A light source as claimed in Claim 1 wherein the master laser (10) operates at a wavelength in the region of 1.5 um.
Claim 3
Dependent Claim
23 words
3 A light source as claimed in Claim 1 or Claim 2 wherein the master laser (10) is a helium neon gas laser.
Claim 4
Dependent Claim
24 words
4 A light source as claimed in any one of the preceding claims wherein the slave laser (14) is a buried crescent semiconductor laser.
Claim 5
Dependent Claim
17 words
5 A light source as claimed in Claim 4 wherein the slave laser (14).is an InGaAsP laser.
Claim 6
Dependent Claim
28 words
6 A light source as claimed in any one of the preceding claims wherein at least one further slave laser is injection locked to the master laser (10).
Claim 7
Dependent Claim
31 words
7 A light source as claimed in Claim 6 wherein the further slave laser is arranged to operate at a frequency offset by a predetermined amount from the slave laser (14).
Claim 8
Dependent Claim
21 words
8 A transmitter for a coherent optical communication system, incorporating a light source according to any one of the preceding claims.
Claim 9
Dependent Claim
16 words
9 A coherent PSK or FSK optical communication system including a transmitter according to Claim 8.
Claim 10
Dependent Claim
36 words
10 A method of operating a laser light source comprising a master laser (10) and at least one slave laser (14), characterised in that the slave laser (14) is injection locked with a gas laser (10).
References Cited (Backward Citations)
No citation records indexed.
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