JPS5522290A - Optical modulator - Google Patents

Optical modulator

Info

Publication number
JPS5522290A
JPS5522290A JP9566978A JP9566978A JPS5522290A JP S5522290 A JPS5522290 A JP S5522290A JP 9566978 A JP9566978 A JP 9566978A JP 9566978 A JP9566978 A JP 9566978A JP S5522290 A JPS5522290 A JP S5522290A
Authority
JP
Japan
Prior art keywords
signal
output
light
signals
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.)
Granted
Application number
JP9566978A
Other languages
Japanese (ja)
Other versions
JPS601605B2 (en
Inventor
Satoru Komurasaki
Seio Watanabe
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 JP53095669A priority Critical patent/JPS601605B2/en
Publication of JPS5522290A publication Critical patent/JPS5522290A/en
Publication of JPS601605B2 publication Critical patent/JPS601605B2/en
Expired 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)
  • Optical Head (AREA)

Abstract

PURPOSE: To save the beam splitter or the optical detector as well as to facilitate an easy control by applying the difference of the average value signals between the output of the voltage comparator to give a comparison between the modulated optical signal and the reference voltage and its inverse output to the optical modulator in the form of the bias.
CONSTITUTION: Output light 10 obtained by modulating input light 5 through optical modulator 3 and by the high frequency signal sent from input point 2 is supplied partially to output light detector 11 via beam splitter 9 and turned to modulated light intensity signal (i) to be then changed to binary voltage signal (e) according to the fact that is larger or smaller than the reference voltage (zero in this case) of voltage comparator 20. Signal (e) is then turned to averaged signals (g) and (h) through low-pass filters 23 and 24 along with binary signal (f) obtained by inverting signal (e). And the difference signal of signals (g) and (h) is supplied to modulator 3 via differential amplifier 14. Then the control is given so that the duty ratio may be 50% for output (e) and (f) and the output of amplifier 14 may be set to zero. As a result, the bias point drift caused the temperature change or the like can be prevented, and thus the bias point can be maintained at the optimum point of 1/2 the maximum output light.
COPYRIGHT: (C)1980,JPO&Japio
JP53095669A 1978-08-04 1978-08-04 light modulator Expired JPS601605B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53095669A JPS601605B2 (en) 1978-08-04 1978-08-04 light modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53095669A JPS601605B2 (en) 1978-08-04 1978-08-04 light modulator

Publications (2)

Publication Number Publication Date
JPS5522290A true JPS5522290A (en) 1980-02-16
JPS601605B2 JPS601605B2 (en) 1985-01-16

Family

ID=14143896

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53095669A Expired JPS601605B2 (en) 1978-08-04 1978-08-04 light modulator

Country Status (1)

Country Link
JP (1) JPS601605B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56153488A (en) * 1980-04-28 1981-11-27 Mitsubishi Electric Corp Recording device
JPS56161501A (en) * 1980-05-19 1981-12-11 Fujitsu Ltd Light variable attenuator
JPS5914143A (en) * 1982-07-13 1984-01-25 Victor Co Of Japan Ltd Modulating system of semiconductor laser
JPS60184226A (en) * 1984-03-02 1985-09-19 Hamamatsu Photonics Kk Writing method of space optical modulator
US4742505A (en) * 1984-11-21 1988-05-03 Olympus Optical Company Limited Optical information recording and reproducing memory system
JPS63199218U (en) * 1988-03-03 1988-12-22

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56153488A (en) * 1980-04-28 1981-11-27 Mitsubishi Electric Corp Recording device
JPS63851B2 (en) * 1980-04-28 1988-01-08 Mitsubishi Electric Corp
JPS56161501A (en) * 1980-05-19 1981-12-11 Fujitsu Ltd Light variable attenuator
JPS5914143A (en) * 1982-07-13 1984-01-25 Victor Co Of Japan Ltd Modulating system of semiconductor laser
JPS60184226A (en) * 1984-03-02 1985-09-19 Hamamatsu Photonics Kk Writing method of space optical modulator
JPH0234367B2 (en) * 1984-03-02 1990-08-02 Hamamatsu Photonics Kk
US4742505A (en) * 1984-11-21 1988-05-03 Olympus Optical Company Limited Optical information recording and reproducing memory system
JPS63199218U (en) * 1988-03-03 1988-12-22

Also Published As

Publication number Publication date
JPS601605B2 (en) 1985-01-16

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