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JPS5591245A - Identification system for optical pcm signal reception - Google Patents

Identification system for optical pcm signal reception

Info

Publication number
JPS5591245A
JPS5591245A JP16477078A JP16477078A JPS5591245A JP S5591245 A JPS5591245 A JP S5591245A JP 16477078 A JP16477078 A JP 16477078A JP 16477078 A JP16477078 A JP 16477078A JP S5591245 A JPS5591245 A JP S5591245A
Authority
JP
Japan
Prior art keywords
circuit
output
level
optical
control
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
JP16477078A
Other languages
Japanese (ja)
Other versions
JPS5738058B2 (en
Inventor
Masayuki Goto
Takashi Kihara
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
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16477078A priority Critical patent/JPS5591245A/en
Publication of JPS5591245A publication Critical patent/JPS5591245A/en
Publication of JPS5738058B2 publication Critical patent/JPS5738058B2/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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/691—Arrangements for optimizing the photodetector in the receiver
    • H04B10/6911—Photodiode bias control, e.g. for compensating temperature variations

Landscapes

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

Abstract

PURPOSE:To increase the margin of the code error for the control of the identifier threshold level of the optical reception circuit which applies the AGC system to control the bias of APD (Avalanche Photo Diode), by varying the threshold level when the optical input level exceeds the fixed level. CONSTITUTION:The optical signal supplied to the optical reception circuit is turned into the electric signal through photoelectric converter 1 and then applied to identifier 6 via DC regeneration circuit 4, equalizer 5 and others after receiving amplification through preamplifier 2 and main amplifier 3 each. Part of the output of equalizer 5 is applied to peak detector 7. With this output, bias control circuit 8 gives the control to the bias of APD. The output of circuit 8 is applied to reception level monitor circuit 10, and the output of circuit 10 is applied to threshold level circuit 11. This output is detected when the optical input level exceeds the fixed level to vary the threshold level of identifier 6.
JP16477078A 1978-12-28 1978-12-28 Identification system for optical pcm signal reception Granted JPS5591245A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16477078A JPS5591245A (en) 1978-12-28 1978-12-28 Identification system for optical pcm signal reception

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16477078A JPS5591245A (en) 1978-12-28 1978-12-28 Identification system for optical pcm signal reception

Publications (2)

Publication Number Publication Date
JPS5591245A true JPS5591245A (en) 1980-07-10
JPS5738058B2 JPS5738058B2 (en) 1982-08-13

Family

ID=15799594

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16477078A Granted JPS5591245A (en) 1978-12-28 1978-12-28 Identification system for optical pcm signal reception

Country Status (1)

Country Link
JP (1) JPS5591245A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4999403A (en) * 1973-01-29 1974-09-19

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4999403A (en) * 1973-01-29 1974-09-19

Also Published As

Publication number Publication date
JPS5738058B2 (en) 1982-08-13

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