JPS57196639A - Level monitoring circuit for photoreceiver - Google Patents

Level monitoring circuit for photoreceiver

Info

Publication number
JPS57196639A
JPS57196639A JP56083259A JP8325981A JPS57196639A JP S57196639 A JPS57196639 A JP S57196639A JP 56083259 A JP56083259 A JP 56083259A JP 8325981 A JP8325981 A JP 8325981A JP S57196639 A JPS57196639 A JP S57196639A
Authority
JP
Japan
Prior art keywords
voltage
amplifier
amplified
difference
peak
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
JP56083259A
Other languages
Japanese (ja)
Inventor
Tadayoshi Kitayama
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56083259A priority Critical patent/JPS57196639A/en
Publication of JPS57196639A publication Critical patent/JPS57196639A/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)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To detect an optical reception level, by providing a logarithmic amplifier outputting a voltage proportional to a logarithm which is a difference between the breakdown voltage of an avalanche photodiode (APD) and a bias voltage. CONSTITUTION:An optical signal is photoelectrically converted and multiplied for electrons at an APD1 and a voltage drop is produced across a resistor 2. This voltage drop is amplified at an amplifier 3 for output and the peak value of the output is detected at a peak detection circuit. A differential amplifier 9 amplifies a difference between the peak voltage and a reference voltage and a voltage amplified at a DC amplifier 10 is a bias voltage of the APD1. The difference between this bias voltge and the breakdown voltage is amplified at a differential amplifier 12 and converted into a logarithm at a logarithmic amplifier 14. When the difference between the output of the amplifier 14 and a prescribed reference voltage is amplified at an amplifier 16, the logarithmic value of the peak of the optical signal can be obtained.
JP56083259A 1981-05-28 1981-05-28 Level monitoring circuit for photoreceiver Pending JPS57196639A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56083259A JPS57196639A (en) 1981-05-28 1981-05-28 Level monitoring circuit for photoreceiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56083259A JPS57196639A (en) 1981-05-28 1981-05-28 Level monitoring circuit for photoreceiver

Publications (1)

Publication Number Publication Date
JPS57196639A true JPS57196639A (en) 1982-12-02

Family

ID=13797339

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56083259A Pending JPS57196639A (en) 1981-05-28 1981-05-28 Level monitoring circuit for photoreceiver

Country Status (1)

Country Link
JP (1) JPS57196639A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2563066A1 (en) * 1984-04-12 1985-10-18 Ericsson Telefon Ab L M DEVICE FOR INCREASING THE DYNAMICS OF AN INTEGRATING OPTOELECTRIC RECEIVER
JPS6198032A (en) * 1984-10-18 1986-05-16 Fujitsu Ltd Optical reception level monitoring circuit
JP2007189294A (en) * 2006-01-11 2007-07-26 Nec Corp System, circuit and method for signal detection, and program

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2563066A1 (en) * 1984-04-12 1985-10-18 Ericsson Telefon Ab L M DEVICE FOR INCREASING THE DYNAMICS OF AN INTEGRATING OPTOELECTRIC RECEIVER
WO1985004773A1 (en) * 1984-04-12 1985-10-24 Telefonaktiebolaget Lm Ericsson Apparatus for increasing the dynamic range in an integrating optoelectric receiver
JPS6198032A (en) * 1984-10-18 1986-05-16 Fujitsu Ltd Optical reception level monitoring circuit
JP2007189294A (en) * 2006-01-11 2007-07-26 Nec Corp System, circuit and method for signal detection, and program

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