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JPS54502A - Selection system of light emitting element - Google Patents

Selection system of light emitting element

Info

Publication number
JPS54502A
JPS54502A JP6488777A JP6488777A JPS54502A JP S54502 A JPS54502 A JP S54502A JP 6488777 A JP6488777 A JP 6488777A JP 6488777 A JP6488777 A JP 6488777A JP S54502 A JPS54502 A JP S54502A
Authority
JP
Japan
Prior art keywords
light emitting
emitting element
selection system
economize
continuity
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.)
Pending
Application number
JP6488777A
Other languages
Japanese (ja)
Inventor
Toshikatsu Yasuda
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6488777A priority Critical patent/JPS54502A/en
Publication of JPS54502A publication Critical patent/JPS54502A/en
Pending 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
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To keep the continuity of information and to economize the system, by performing selection to a spare light emitting element in synchronizing with an input signal, after detecting the deterioration of the output of light emission.
JP6488777A 1977-06-03 1977-06-03 Selection system of light emitting element Pending JPS54502A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6488777A JPS54502A (en) 1977-06-03 1977-06-03 Selection system of light emitting element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6488777A JPS54502A (en) 1977-06-03 1977-06-03 Selection system of light emitting element

Publications (1)

Publication Number Publication Date
JPS54502A true JPS54502A (en) 1979-01-05

Family

ID=13271047

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6488777A Pending JPS54502A (en) 1977-06-03 1977-06-03 Selection system of light emitting element

Country Status (1)

Country Link
JP (1) JPS54502A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56108276U (en) * 1980-01-22 1981-08-22
JPS62500208A (en) * 1984-09-12 1987-01-22 スクエア　デイ−　カンパニ− circuit breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56108276U (en) * 1980-01-22 1981-08-22
JPS62500208A (en) * 1984-09-12 1987-01-22 スクエア　デイ−　カンパニ− circuit breaker

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