JPS5491002A - Analog light communication unit - Google Patents

Analog light communication unit

Info

Publication number
JPS5491002A
JPS5491002A JP15797777A JP15797777A JPS5491002A JP S5491002 A JPS5491002 A JP S5491002A JP 15797777 A JP15797777 A JP 15797777A JP 15797777 A JP15797777 A JP 15797777A JP S5491002 A JPS5491002 A JP S5491002A
Authority
JP
Japan
Prior art keywords
laser
input signal
gate
supplied
level
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
JP15797777A
Other languages
Japanese (ja)
Other versions
JPS6111497B2 (en
Inventor
Michiji Takemata
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15797777A priority Critical patent/JPS5491002A/en
Publication of JPS5491002A publication Critical patent/JPS5491002A/en
Publication of JPS6111497B2 publication Critical patent/JPS6111497B2/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
    • H04B10/50—Transmitters

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 prolong the life of a semiconductor laser by stopping the laser to operate when an input signal level is below fixed one. CONSTITUTION:After being PFM-modulated 5, an input signal is pulse-amplified 6 and then supplied to gate 2 and the level of the input signal is detected and decided 3, so that its output control signal will be supplied to gate 2. When an input signal is above a decision level, a PFM pulse is supplied to laser driver circuit 9 via gate 2 and its output allows laser 10 to start operating; when it is below the decision level, gate 2 is caused to close, thereby stopping laser 10 to luminesce.
JP15797777A 1977-12-28 1977-12-28 Analog light communication unit Granted JPS5491002A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15797777A JPS5491002A (en) 1977-12-28 1977-12-28 Analog light communication unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15797777A JPS5491002A (en) 1977-12-28 1977-12-28 Analog light communication unit

Publications (2)

Publication Number Publication Date
JPS5491002A true JPS5491002A (en) 1979-07-19
JPS6111497B2 JPS6111497B2 (en) 1986-04-03

Family

ID=15661547

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15797777A Granted JPS5491002A (en) 1977-12-28 1977-12-28 Analog light communication unit

Country Status (1)

Country Link
JP (1) JPS5491002A (en)

Also Published As

Publication number Publication date
JPS6111497B2 (en) 1986-04-03

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