JPS5535563A - Light reception circuit - Google Patents

Light reception circuit

Info

Publication number
JPS5535563A
JPS5535563A JP10929478A JP10929478A JPS5535563A JP S5535563 A JPS5535563 A JP S5535563A JP 10929478 A JP10929478 A JP 10929478A JP 10929478 A JP10929478 A JP 10929478A JP S5535563 A JPS5535563 A JP S5535563A
Authority
JP
Japan
Prior art keywords
input
feedback resistance
feedback
resistance
small
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
JP10929478A
Other languages
Japanese (ja)
Inventor
Takatoshi Minami
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 JP10929478A priority Critical patent/JPS5535563A/en
Publication of JPS5535563A publication Critical patent/JPS5535563A/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
    • H04B10/691—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)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To increase the feedback resistance value in case the optical input is small and decrease the resistance value when the input is large respectively, thus securing a high S/N for the small input as well as minimizing occurrence of the output saturation at the input time. CONSTITUTION:Amplifier 11 consists of input impedance 12 and equivalent voltage source 13 representing the output, and the feedback resistance is produced by control-type variable resistance 14. And the value of the resistance is varied by the input given from control terminal 15. Therefore, the feedback resistance value increases when the optical input os small to decrease the feedback quantity. Thus the deterioration of S/N due to the feedback resistance is reduced. While in case the optical input is large, the feedback resistance decreases to reduce the input impedance of the amplifier. As a result, the saturation of the output is not caused easily, thus giving deterioration to the dynamic range of the input light.
JP10929478A 1978-09-06 1978-09-06 Light reception circuit Pending JPS5535563A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10929478A JPS5535563A (en) 1978-09-06 1978-09-06 Light reception circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10929478A JPS5535563A (en) 1978-09-06 1978-09-06 Light reception circuit

Publications (1)

Publication Number Publication Date
JPS5535563A true JPS5535563A (en) 1980-03-12

Family

ID=14506519

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10929478A Pending JPS5535563A (en) 1978-09-06 1978-09-06 Light reception circuit

Country Status (1)

Country Link
JP (1) JPS5535563A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57152740A (en) * 1981-03-17 1982-09-21 Hitachi Cable Ltd Optical receiving circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57152740A (en) * 1981-03-17 1982-09-21 Hitachi Cable Ltd Optical receiving circuit

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