JPS57159155A - Photo reception module - Google Patents

Photo reception module

Info

Publication number
JPS57159155A
JPS57159155A JP56043884A JP4388481A JPS57159155A JP S57159155 A JPS57159155 A JP S57159155A JP 56043884 A JP56043884 A JP 56043884A JP 4388481 A JP4388481 A JP 4388481A JP S57159155 A JPS57159155 A JP S57159155A
Authority
JP
Japan
Prior art keywords
pulse width
input signal
comparator
output
optical
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
JP56043884A
Other languages
Japanese (ja)
Inventor
Kiyohide Miyake
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 JP56043884A priority Critical patent/JPS57159155A/en
Publication of JPS57159155A publication Critical patent/JPS57159155A/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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/695—Arrangements for optimizing the decision element in the receiver, e.g. by using automatic threshold control

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Pulse Circuits (AREA)
  • Dc Digital Transmission (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To achieve an output with a prescribed pulse width to an input level changed rapidly, by delaying a part of an input signal by a half the pulse width and inputting it as a threshold value of a comparator, in a reception system of an optical communication system. CONSTITUTION:An optical input signal incoming in converted into an electric signal at a photo detector 1 and amplified at an amplifier 2, and a waveform 11 is applied to a comparator 5, a part of this input signal is attenuated by 3 dB at an attenuator 3 and delayed at a delay line 4 by a half an optical input signal pulse width T, and a waveform 12 is inputted as a threshold value of the comparator 5. The comparator 5 is operated when both input signals 11 and 12 are crossed to generate a step output 13, a monostable multivibrator circuit 6 is operated with the output to generate an output signal 14 with the pulse width accurately set to the optical input signal pulse width.
JP56043884A 1981-03-27 1981-03-27 Photo reception module Pending JPS57159155A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56043884A JPS57159155A (en) 1981-03-27 1981-03-27 Photo reception module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56043884A JPS57159155A (en) 1981-03-27 1981-03-27 Photo reception module

Publications (1)

Publication Number Publication Date
JPS57159155A true JPS57159155A (en) 1982-10-01

Family

ID=12676127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56043884A Pending JPS57159155A (en) 1981-03-27 1981-03-27 Photo reception module

Country Status (1)

Country Link
JP (1) JPS57159155A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5224062A (en) * 1975-08-18 1977-02-23 Fujitsu Ltd Bipolar-unipolar conversion circuit
JPS54130864A (en) * 1978-04-03 1979-10-11 Fujitsu Ltd Signal discriminator circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5224062A (en) * 1975-08-18 1977-02-23 Fujitsu Ltd Bipolar-unipolar conversion circuit
JPS54130864A (en) * 1978-04-03 1979-10-11 Fujitsu Ltd Signal discriminator circuit

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