JPS55133017A - Light power control unit - Google Patents

Light power control unit

Info

Publication number
JPS55133017A
JPS55133017A JP4060279A JP4060279A JPS55133017A JP S55133017 A JPS55133017 A JP S55133017A JP 4060279 A JP4060279 A JP 4060279A JP 4060279 A JP4060279 A JP 4060279A JP S55133017 A JPS55133017 A JP S55133017A
Authority
JP
Japan
Prior art keywords
light power
bias voltage
modulator
controlling
transmission
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
JP4060279A
Other languages
Japanese (ja)
Other versions
JPH0157329B2 (en
Inventor
Akira Ichinose
Shunji Kanamaru
Hideo Okamura
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4060279A priority Critical patent/JPS55133017A/en
Publication of JPS55133017A publication Critical patent/JPS55133017A/en
Publication of JPH0157329B2 publication Critical patent/JPH0157329B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
    • G02F1/0123—Circuits for the control or stabilisation of the bias voltage, e.g. automatic bias control [ABC] feedback loops

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

PURPOSE:To make possible the stable controlling of light power by delaying the change speed of bias voltage by an LPF at the resetting of transmission power controlling bias point to the feedback circuit for controlling the transmission light power of a light modulator by crystal. CONSTITUTION:The intensity modulated light from modulator 2 which makes use of polarization by the electro-optic effect of crystal is detected and fed back by way of a photo detector and the transmitted light power of the modulator 2 is controlled constant. The sinusoidal bias voltage-transmission light power curve including linear portions fluctuates according to the change of temperature, etc. and therefore if the bias voltage of the modulator 2 is re-adjusted by a reset switch 17, the switches 15, 16 of the specified clock period feedback circuit are turned ON and a switch 14 is turned OFF by a signal generating circuit 18 according to the ON and OFF of the switch 17 and the change speed of the bias voltage at the resetting is delayed from the response speed of the transmission light power by the LPF by a resistance R1 and capacitor C, whereby the stable controlling of the transmission light is accomplished without saturation, etc. of the bias voltage.
JP4060279A 1979-04-03 1979-04-03 Light power control unit Granted JPS55133017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4060279A JPS55133017A (en) 1979-04-03 1979-04-03 Light power control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4060279A JPS55133017A (en) 1979-04-03 1979-04-03 Light power control unit

Publications (2)

Publication Number Publication Date
JPS55133017A true JPS55133017A (en) 1980-10-16
JPH0157329B2 JPH0157329B2 (en) 1989-12-05

Family

ID=12585056

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4060279A Granted JPS55133017A (en) 1979-04-03 1979-04-03 Light power control unit

Country Status (1)

Country Link
JP (1) JPS55133017A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758070A (en) * 1985-05-31 1988-07-19 Canon Kabushiki Kaisha Variable focal length lens
JPH04253023A (en) * 1990-03-29 1992-09-08 Hughes Aircraft Co Automatic bias controller for electric/optical modulator and control method thereof
EP0710867A3 (en) * 1994-11-04 1996-08-14 Nec Corp Optical modulation device having bias reset means
EP1380874A1 (en) * 2002-07-11 2004-01-14 Agilent Technologies, Inc. - a Delaware corporation - Control loop apparatus and method therefor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758070A (en) * 1985-05-31 1988-07-19 Canon Kabushiki Kaisha Variable focal length lens
JPH04253023A (en) * 1990-03-29 1992-09-08 Hughes Aircraft Co Automatic bias controller for electric/optical modulator and control method thereof
EP0710867A3 (en) * 1994-11-04 1996-08-14 Nec Corp Optical modulation device having bias reset means
US5742268A (en) * 1994-11-04 1998-04-21 Nec Corporation Optical modulation device having bias reset means
EP1380874A1 (en) * 2002-07-11 2004-01-14 Agilent Technologies, Inc. - a Delaware corporation - Control loop apparatus and method therefor

Also Published As

Publication number Publication date
JPH0157329B2 (en) 1989-12-05

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