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JPS5552022A - Light modulating device - Google Patents

Light modulating device

Info

Publication number
JPS5552022A
JPS5552022A JP12667278A JP12667278A JPS5552022A JP S5552022 A JPS5552022 A JP S5552022A JP 12667278 A JP12667278 A JP 12667278A JP 12667278 A JP12667278 A JP 12667278A JP S5552022 A JPS5552022 A JP S5552022A
Authority
JP
Japan
Prior art keywords
light modulator
amplitude
carrier signal
order higher
control circuit
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
JP12667278A
Other languages
Japanese (ja)
Inventor
Hiroshi Kitaura
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 JP12667278A priority Critical patent/JPS5552022A/en
Publication of JPS5552022A publication Critical patent/JPS5552022A/en
Pending 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
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/19—Function characteristic linearised modulation; reduction of harmonic distortions

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

PURPOSE:To perform optimum modulation by providing an amplitude control circuit, etc., detecting third order higher harmonic components produced by a light modulator and so controlling the same as to become always a fixed level or under. CONSTITUTION:Part of the laser light modulated by a light modulator 12 is branched by a beam splitter 13 to control an amplitude control circuit 16 by way of a photoelectric transducer 17 or the like, whereby the amplitude of the modulating carrier signal being applied to the light modulator 12 is changed. When the amplitude of the carrier signal being applied to the light modulator 12 is small, the portions of the modulation characteristic curve 1 close to a straight line are used and therefore distortions are sufficiently small. When the amplitude of the carrier signal increases, the higher harmonic distortions increase abruptly. In this case, third order higher harmonics appear but the input carrier of the light modulator 12 is so controlled that the third order higher harmonics become always a fixed level or under. Hence, the optimum modulation by which the signal of good quality is obtained may be accomplished.
JP12667278A 1978-10-13 1978-10-13 Light modulating device Pending JPS5552022A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12667278A JPS5552022A (en) 1978-10-13 1978-10-13 Light modulating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12667278A JPS5552022A (en) 1978-10-13 1978-10-13 Light modulating device

Publications (1)

Publication Number Publication Date
JPS5552022A true JPS5552022A (en) 1980-04-16

Family

ID=14940997

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12667278A Pending JPS5552022A (en) 1978-10-13 1978-10-13 Light modulating device

Country Status (1)

Country Link
JP (1) JPS5552022A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61148639A (en) * 1984-12-21 1986-07-07 Sony Corp Light modulation device
JPS61249017A (en) * 1985-04-27 1986-11-06 Sony Corp Light controller
US5317581A (en) * 1991-10-31 1994-05-31 Fujitsu Limited Electric field absorption light modulation driving apparatus and method having improved feature to eliminate noise from optical output
EP0728325A4 (en) * 1992-09-02 1995-07-26 Harmonic Lightwaves Inc Cascaded optical modulation system with high linearity

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61148639A (en) * 1984-12-21 1986-07-07 Sony Corp Light modulation device
JPS61249017A (en) * 1985-04-27 1986-11-06 Sony Corp Light controller
US5317581A (en) * 1991-10-31 1994-05-31 Fujitsu Limited Electric field absorption light modulation driving apparatus and method having improved feature to eliminate noise from optical output
EP0728325A4 (en) * 1992-09-02 1995-07-26 Harmonic Lightwaves Inc Cascaded optical modulation system with high linearity
EP0728325A1 (en) * 1992-09-02 1996-08-28 Harmonic Lightwaves, Inc. Cascaded optical modulation system with high linearity

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