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WO2009078435A1 - Control device for external modulator and control method - Google Patents

Control device for external modulator and control method Download PDF

Info

Publication number
WO2009078435A1
WO2009078435A1 PCT/JP2008/072971 JP2008072971W WO2009078435A1 WO 2009078435 A1 WO2009078435 A1 WO 2009078435A1 JP 2008072971 W JP2008072971 W JP 2008072971W WO 2009078435 A1 WO2009078435 A1 WO 2009078435A1
Authority
WO
WIPO (PCT)
Prior art keywords
low frequency
frequency signal
external modulator
signal
output
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.)
Ceased
Application number
PCT/JP2008/072971
Other languages
French (fr)
Japanese (ja)
Inventor
Yoshiharu Fujisaku
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.)
Fujikura Ltd
Original Assignee
Fujikura 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 Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP2009545757A priority Critical patent/JPWO2009078435A1/en
Publication of WO2009078435A1 publication Critical patent/WO2009078435A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
    • H04B10/50575—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulator DC bias
    • 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 
    • G02F1/21—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  by interference

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Semiconductor Lasers (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

A control device for an external modulator modulates projected light from a light source in accordance with an input signal. The control device is provided with a light output control means that controls an output of the light source; a low frequency signal generation means that generates and outputs a low frequency signal; a signal superimposing means that superimposes a first modulation signal as the input signal on the low frequency signal to obtain a second modulation signal and applies the second modulation signal to the external modulator; a low frequency signal detection means that detects a component of the low frequency signal from a light output from the external modulator, compares a phase of the detected low frequency signal with that of the low frequency signal outputted from the low frequency signal generation means, and outputs their phase difference information; and an operation point control means that, when the output of the light source is controlled by the light output control means so as to make the output of the external modulator not larger than a predetermined target value, carries out a leading-in control of an operation point of the external modulator based on the phase difference information.
PCT/JP2008/072971 2007-12-17 2008-12-17 Control device for external modulator and control method Ceased WO2009078435A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009545757A JPWO2009078435A1 (en) 2007-12-17 2008-12-17 External modulator control apparatus and control method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007-324719 2007-12-17
JP2007324719 2007-12-17

Publications (1)

Publication Number Publication Date
WO2009078435A1 true WO2009078435A1 (en) 2009-06-25

Family

ID=40795548

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/072971 Ceased WO2009078435A1 (en) 2007-12-17 2008-12-17 Control device for external modulator and control method

Country Status (2)

Country Link
JP (1) JPWO2009078435A1 (en)
WO (1) WO2009078435A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102193028A (en) * 2010-03-05 2011-09-21 上海微电子装备有限公司 Detecting device and detecting method for resonant frequency of electro-optic phase modulator
JP5006978B1 (en) * 2011-03-30 2012-08-22 株式会社フジクラ Compensation method, optical modulation system, and optical demodulation system
WO2013114628A1 (en) * 2012-02-03 2013-08-08 富士通株式会社 Optical transmitter and method for controlling bias in optical modulator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03251815A (en) * 1990-03-01 1991-11-11 Fujitsu Ltd Control system for external modulator
JP2006121368A (en) * 2004-10-21 2006-05-11 Fujitsu Ltd Optical transmitter
JP2007123747A (en) * 2005-10-31 2007-05-17 Mitsubishi Electric Corp Optical transmitter
JP2007206380A (en) * 2006-02-02 2007-08-16 Yokogawa Electric Corp Light modulator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03251815A (en) * 1990-03-01 1991-11-11 Fujitsu Ltd Control system for external modulator
JP2006121368A (en) * 2004-10-21 2006-05-11 Fujitsu Ltd Optical transmitter
JP2007123747A (en) * 2005-10-31 2007-05-17 Mitsubishi Electric Corp Optical transmitter
JP2007206380A (en) * 2006-02-02 2007-08-16 Yokogawa Electric Corp Light modulator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102193028A (en) * 2010-03-05 2011-09-21 上海微电子装备有限公司 Detecting device and detecting method for resonant frequency of electro-optic phase modulator
CN102193028B (en) * 2010-03-05 2013-09-11 上海微电子装备有限公司 Detecting device and detecting method for resonant frequency of electro-optic phase modulator
JP5006978B1 (en) * 2011-03-30 2012-08-22 株式会社フジクラ Compensation method, optical modulation system, and optical demodulation system
WO2012132112A1 (en) * 2011-03-30 2012-10-04 株式会社フジクラ Correction method, optical modulation system, and optical demodulation system
US8493647B2 (en) 2011-03-30 2013-07-23 Fujikura Ltd. Compensation method, optical modulation system, and optical demodulation system
WO2013114628A1 (en) * 2012-02-03 2013-08-08 富士通株式会社 Optical transmitter and method for controlling bias in optical modulator
JPWO2013114628A1 (en) * 2012-02-03 2015-05-11 富士通株式会社 Optical transmitter and bias control method for optical modulator
US9350455B2 (en) 2012-02-03 2016-05-24 Fujitsu Limited Optical transmitter and bias control method of optical modulator

Also Published As

Publication number Publication date
JPWO2009078435A1 (en) 2011-04-28

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