AU4850390A - Laser diode transmitter with protection and alarm signalling circuit - Google Patents
Laser diode transmitter with protection and alarm signalling circuitInfo
- Publication number
- AU4850390A AU4850390A AU48503/90A AU4850390A AU4850390A AU 4850390 A AU4850390 A AU 4850390A AU 48503/90 A AU48503/90 A AU 48503/90A AU 4850390 A AU4850390 A AU 4850390A AU 4850390 A AU4850390 A AU 4850390A
- Authority
- AU
- Australia
- Prior art keywords
- laser diode
- diode
- modulation current
- protection
- monitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/504—Laser transmitters using direct modulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/564—Power control
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Semiconductor Lasers (AREA)
- Burglar Alarm Systems (AREA)
- Optical Communication System (AREA)
Abstract
Laser diode transmitters contain control circuits for the preconduction current and the modulation current of the laser diode which are controlled via a monitor diode optically coupled to the laser diode. Disablement of the monitor diode may result in an excessively low optical transmission level being deceptively simulated for the control circuit and the modulation current of the laser diode then being increased to the point where the latter is endangered. According to the invention, an improved laser diode transmitter is described which protects the laser diode against excessively high modulation current and transmits an alarm signal to a monitoring device even if the monitor diode fails completely. <IMAGE>
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3901221 | 1989-01-17 | ||
DE3901221 | 1989-01-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
AU4850390A true AU4850390A (en) | 1990-07-26 |
AU624213B2 AU624213B2 (en) | 1992-06-04 |
Family
ID=6372238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU48503/90A Ceased AU624213B2 (en) | 1989-01-17 | 1990-01-16 | Laser diode transmitter with protection and alarm signalling circuit |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0379026B1 (en) |
AT (1) | ATE120589T1 (en) |
AU (1) | AU624213B2 (en) |
DE (1) | DE59008778D1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5091797A (en) * | 1989-11-13 | 1992-02-25 | Siemens Aktiengesellschaft | Method and apparatus for modulation current regulation for laser diodes |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2911858C2 (en) * | 1979-03-26 | 1983-01-13 | Robert Bosch Gmbh, 7000 Stuttgart | Circuit for limiting the light output emitted by a semiconductor laser |
DE3137497A1 (en) * | 1981-09-21 | 1983-04-07 | Siemens Ag | OPTICAL TRANSMISSION SYSTEM FOR HIGH FREQUENCY DIGITAL SIGNALS |
DE3508034A1 (en) * | 1985-03-07 | 1986-09-11 | Ant Nachrichtentech | Circuit arrangement for driving a semiconductor laser |
EP0404906A1 (en) * | 1988-12-15 | 1991-01-02 | Hughes Aircraft Company | Signal power control system for fiber optic communication systems |
-
1990
- 1990-01-08 AT AT90100319T patent/ATE120589T1/en not_active IP Right Cessation
- 1990-01-08 EP EP90100319A patent/EP0379026B1/en not_active Expired - Lifetime
- 1990-01-08 DE DE59008778T patent/DE59008778D1/en not_active Expired - Fee Related
- 1990-01-16 AU AU48503/90A patent/AU624213B2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
EP0379026B1 (en) | 1995-03-29 |
AU624213B2 (en) | 1992-06-04 |
DE59008778D1 (en) | 1995-05-04 |
EP0379026A2 (en) | 1990-07-25 |
ATE120589T1 (en) | 1995-04-15 |
EP0379026A3 (en) | 1992-04-29 |
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