JPS6336582B2 - - Google Patents

Info

Publication number
JPS6336582B2
JPS6336582B2 JP55082034A JP8203480A JPS6336582B2 JP S6336582 B2 JPS6336582 B2 JP S6336582B2 JP 55082034 A JP55082034 A JP 55082034A JP 8203480 A JP8203480 A JP 8203480A JP S6336582 B2 JPS6336582 B2 JP S6336582B2
Authority
JP
Japan
Prior art keywords
voltage
fault
information
frequency
monitoring
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.)
Expired
Application number
JP55082034A
Other languages
English (en)
Japanese (ja)
Other versions
JPS577639A (en
Inventor
Shinji Kyota
Masami Kato
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.)
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
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 Fujitsu Ltd, Nippon Telegraph and Telephone Corp filed Critical Fujitsu Ltd
Priority to JP8203480A priority Critical patent/JPS577639A/ja
Publication of JPS577639A publication Critical patent/JPS577639A/ja
Publication of JPS6336582B2 publication Critical patent/JPS6336582B2/ja
Granted 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission 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
    • H01S5/06808—Stabilisation of laser output parameters by monitoring the electrical laser parameters, e.g. voltage or current
    • 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)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Selective Calling Equipment (AREA)
JP8203480A 1980-06-17 1980-06-17 Fault monitoring circuit Granted JPS577639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8203480A JPS577639A (en) 1980-06-17 1980-06-17 Fault monitoring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8203480A JPS577639A (en) 1980-06-17 1980-06-17 Fault monitoring circuit

Publications (2)

Publication Number Publication Date
JPS577639A JPS577639A (en) 1982-01-14
JPS6336582B2 true JPS6336582B2 (ru) 1988-07-20

Family

ID=13763237

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8203480A Granted JPS577639A (en) 1980-06-17 1980-06-17 Fault monitoring circuit

Country Status (1)

Country Link
JP (1) JPS577639A (ru)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4957797A (ru) * 1972-10-02 1974-06-05
JPS52114209A (en) * 1976-03-22 1977-09-24 Maspro Denko Kk Device for monitoring operating state of line amplifier
JPS52123196A (en) * 1976-04-08 1977-10-17 Nec Corp Frequency multiplication type alarm transfer unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4957797A (ru) * 1972-10-02 1974-06-05
JPS52114209A (en) * 1976-03-22 1977-09-24 Maspro Denko Kk Device for monitoring operating state of line amplifier
JPS52123196A (en) * 1976-04-08 1977-10-17 Nec Corp Frequency multiplication type alarm transfer unit

Also Published As

Publication number Publication date
JPS577639A (en) 1982-01-14

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