GB2323467A - Frequency synthesizer - Google Patents
Frequency synthesizerInfo
- 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
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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Semiconductor Lasers (AREA)
- Lasers (AREA)
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.
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)
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)
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)
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 |
-
1996
- 1996-11-13 GB GB9809832A patent/GB2323467B/en not_active Revoked
Patent Citations (4)
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)
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 |