GB2323467A - Frequency synthesizer - Google Patents

Frequency synthesizer

Info

Publication number
GB2323467A
GB2323467A GB9809832A GB9809832A GB2323467A GB 2323467 A GB2323467 A GB 2323467A GB 9809832 A GB9809832 A GB 9809832A GB 9809832 A GB9809832 A GB 9809832A GB 2323467 A GB2323467 A GB 2323467A
Authority
GB
United Kingdom
Prior art keywords
optical
frequency synthesizer
lasers
coupler
frequency
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
GB9809832A
Other versions
GB9809832D0 (en
GB2323467B (en
Inventor
Yvonne Etem
Meirion Francis Lewis
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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
Priority claimed from GB9523518A external-priority patent/GB2307332A/en
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB9809832A priority Critical patent/GB2323467B/en
Publication of GB9809832D0 publication Critical patent/GB9809832D0/en
Publication of GB2323467A publication Critical patent/GB2323467A/en
Application granted granted Critical
Publication of GB2323467B publication Critical patent/GB2323467B/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2383—Parallel arrangements
    • 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
    • G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
    • G02F2/002—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light using optical mixing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06226—Modulation at ultra-high frequencies
    • H01S5/0623—Modulation at ultra-high frequencies using the beating between two closely spaced optical frequencies, i.e. heterodyne mixing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30

Abstract

A frequency synthesizer (300) includes an optical delay line (322) for delaying one optical signal from a coupler (308) relative to a second optical signal. The optical signals are obtained by mixing radiation from two lasers (304, 306) in the coupler (308). By measuring the phase difference between the resulting modulated optical signals, a negative feedback signal is obtained. This feedback signal is used to control the beat frequency of the lasers and in turn to stabilise the output frequency of the synthesizer.
GB9809832A 1995-11-17 1996-11-13 Frequency synthesizer Revoked GB2323467B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9809832A GB2323467B (en) 1995-11-17 1996-11-13 Frequency synthesizer

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9523518A GB2307332A (en) 1995-11-17 1995-11-17 Optical frequency synthesiser
PCT/GB1996/002761 WO1997019504A1 (en) 1995-11-17 1996-11-13 Frequency synthesizer
GB9809832A GB2323467B (en) 1995-11-17 1996-11-13 Frequency synthesizer

Publications (3)

Publication Number Publication Date
GB9809832D0 GB9809832D0 (en) 1998-07-08
GB2323467A true GB2323467A (en) 1998-09-23
GB2323467B GB2323467B (en) 2000-02-16

Family

ID=26308132

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9809832A Revoked GB2323467B (en) 1995-11-17 1996-11-13 Frequency synthesizer

Country Status (1)

Country Link
GB (1) GB2323467B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2381121A (en) * 2001-06-07 2003-04-23 Univ London Optical Frequency Synthesizer
US6868102B2 (en) 2001-09-27 2005-03-15 Alcatel CS-RZ optical clock signal generator, and a resynchronized optical multiplexer containing such a generator
CN103078241A (en) * 2013-01-16 2013-05-01 山西大学 All-optical-fiber laser noise filtering device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182801A (en) * 1985-11-06 1987-05-20 American Telephone & Telegraph Coherent lightwave transmitter
EP0352747A2 (en) * 1988-07-29 1990-01-31 Hitachi, Ltd. Frequency separation stabilization method for optical heterodyne or optical homodyne communication
US5204640A (en) * 1992-02-10 1993-04-20 California Institute Of Technology Widely tunable oscillator stabilization using analog fiber optic delay line
US5379309A (en) * 1993-08-16 1995-01-03 California Institute Of Technology High frequency source having heterodyned laser oscillators injection-locked to a mode-locked laser

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042891A (en) * 1976-07-30 1977-08-16 International Telephone And Telegraph Corporation Frequency synthesizer having frequency control loop including fiber optic delay line

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182801A (en) * 1985-11-06 1987-05-20 American Telephone & Telegraph Coherent lightwave transmitter
EP0352747A2 (en) * 1988-07-29 1990-01-31 Hitachi, Ltd. Frequency separation stabilization method for optical heterodyne or optical homodyne communication
US5204640A (en) * 1992-02-10 1993-04-20 California Institute Of Technology Widely tunable oscillator stabilization using analog fiber optic delay line
US5379309A (en) * 1993-08-16 1995-01-03 California Institute Of Technology High frequency source having heterodyned laser oscillators injection-locked to a mode-locked laser

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2381121A (en) * 2001-06-07 2003-04-23 Univ London Optical Frequency Synthesizer
US6868102B2 (en) 2001-09-27 2005-03-15 Alcatel CS-RZ optical clock signal generator, and a resynchronized optical multiplexer containing such a generator
CN103078241A (en) * 2013-01-16 2013-05-01 山西大学 All-optical-fiber laser noise filtering device

Also Published As

Publication number Publication date
GB9809832D0 (en) 1998-07-08
GB2323467B (en) 2000-02-16

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
773K Patent revoked under sect. 73(2)/1977