JPS572142A - Optical repeater - Google Patents

Optical repeater

Info

Publication number
JPS572142A
JPS572142A JP7610980A JP7610980A JPS572142A JP S572142 A JPS572142 A JP S572142A JP 7610980 A JP7610980 A JP 7610980A JP 7610980 A JP7610980 A JP 7610980A JP S572142 A JPS572142 A JP S572142A
Authority
JP
Japan
Prior art keywords
optical
circuit
level
repeater
supplied
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
JP7610980A
Other languages
Japanese (ja)
Other versions
JPS5911213B2 (en
Inventor
Toshinori Mori
Norio Nishi
Kyoichi Iwasa
Shinji Nagaoka
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.)
NTT Inc
Original Assignee
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP55076109A priority Critical patent/JPS5911213B2/en
Publication of JPS572142A publication Critical patent/JPS572142A/en
Publication of JPS5911213B2 publication Critical patent/JPS5911213B2/en
Expired 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
    • H04B10/29—Repeaters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To increase the reliability of an optical repeater, by suppressing the output of the beam of a semiconductor laser by the function of a control circuit when the optical input level of the supplied optical time series digital information is less than a prescribed value and then actuating slowly the control circuit. CONSTITUTION:In case the optical level of the optical information supplied to an optical repeater 1 is less than the optical level which is necessary for the normal working of the repeater 1, a specific control signal affects a logical circuit 21 to prevent the electric information obtained from an identifying circuit 9 from being supplied to a driving circuit 10. At the same time, a control circuit 22 suppresses forcibly the bias current of a semiconductor laser 11 down to almost zero to a stabilizing circuit 12 that holds the optical output level of the laser 11 to avoid an output of the optical information from the laser 11. Furthermore, these functions are given gradually within a range less than the time required for switching of an optical switch and with a time constant larger enough than the time constant at the interstage coupling part of an amplifying circuit.
JP55076109A 1980-06-06 1980-06-06 optical repeater Expired JPS5911213B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55076109A JPS5911213B2 (en) 1980-06-06 1980-06-06 optical repeater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55076109A JPS5911213B2 (en) 1980-06-06 1980-06-06 optical repeater

Publications (2)

Publication Number Publication Date
JPS572142A true JPS572142A (en) 1982-01-07
JPS5911213B2 JPS5911213B2 (en) 1984-03-14

Family

ID=13595718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55076109A Expired JPS5911213B2 (en) 1980-06-06 1980-06-06 optical repeater

Country Status (1)

Country Link
JP (1) JPS5911213B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58126902A (en) * 1982-01-22 1983-07-28 Nachi Fujikoshi Corp Coated cutting tool
US5252119A (en) * 1990-10-31 1993-10-12 Hitachi Metals, Ltd. High speed tool steel produced by sintering powder and method of producing same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58126902A (en) * 1982-01-22 1983-07-28 Nachi Fujikoshi Corp Coated cutting tool
US5252119A (en) * 1990-10-31 1993-10-12 Hitachi Metals, Ltd. High speed tool steel produced by sintering powder and method of producing same

Also Published As

Publication number Publication date
JPS5911213B2 (en) 1984-03-14

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