AU4850390A - Laser diode transmitter with protection and alarm signalling circuit - Google Patents

Laser diode transmitter with protection and alarm signalling circuit

Info

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
Application number
AU48503/90A
Other versions
AU624213B2 (en
Inventor
Juergen Vosskaemper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of AU4850390A publication Critical patent/AU4850390A/en
Application granted granted Critical
Publication of AU624213B2 publication Critical patent/AU624213B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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>
AU48503/90A 1989-01-17 1990-01-16 Laser diode transmitter with protection and alarm signalling circuit Ceased AU624213B2 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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

Similar Documents

Publication Publication Date Title
AU2003202867A1 (en) Power control cduring state transition
KR900008794A (en) Optical network
AU624213B2 (en) Laser diode transmitter with protection and alarm signalling circuit
ATE114835T1 (en) PROCEDURE FOR FAULT DETECTION AND LOCALIZATION OF REDUNDANT SIGNALS IN AN AUTOMATION SYSTEM.
CA2104212A1 (en) Photonic amplifier
EP1044596A3 (en) Alarm system for agricultural equipment
EP1309109A3 (en) Apparatus and method for monitoring an optical transmission line
SE8703491L (en) SET TO DETECT EXTERNAL POWER ON AN OPTICAL CABLE
GB9118780D0 (en) A sensor
NO953399L (en) Device and method of transmitting information by means of markers and markers for use in such a device
GR3007111T3 (en)
US6771678B1 (en) Laser system and method of operation having improved signal continuity and safety
GB2069261A (en) Fibre optic signalling
EP0598985A3 (en) Device for monitoring and surveying one power section controlled by an electronic circuit.
US5905588A (en) Optical transmitting device
KR910700571A (en) Signal Power Control System for Fiber Optic Communication System
ES2065584T3 (en) ROAD CIRCUIT WITH CROSS CORRELATION.
JPS5652945A (en) Data transmission device
CA1273400A (en) Laser driver circuit
JPS644127A (en) Space light transmission equipment
NO942355D0 (en)
RU2522893C2 (en) Device for inspecting fibre-optic lines
GB2269932A (en) Method and control circuit for controlling a laser diode transmitter
ATE87385T1 (en) SECURITY SYSTEM WITH RADIO ELECTRICAL TRANSMISSION.
GB2315547A (en) A security device which uses a fibre optic cable to protect electronic equipment