CN104506297A - Frequency transmission system based on digital compensation systems, and transmission method of frequency transmission system - Google Patents
Frequency transmission system based on digital compensation systems, and transmission method of frequency transmission system Download PDFInfo
- Publication number
- CN104506297A CN104506297A CN201410779831.3A CN201410779831A CN104506297A CN 104506297 A CN104506297 A CN 104506297A CN 201410779831 A CN201410779831 A CN 201410779831A CN 104506297 A CN104506297 A CN 104506297A
- Authority
- CN
- China
- Prior art keywords
- frequency
- optical fiber
- division multiplexing
- mode
- wavelength division
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0075—Arrangements for synchronising receiver with transmitter with photonic or optical means
-
- 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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6164—Estimation or correction of the frequency offset between the received optical signal and the optical local oscillator
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a frequency transmission system based on digital compensation systems, and a transmission method of the frequency transmission system. In combination with an intensive wavelength division multiplexing transmission device, an optical frequency locking device and the digital compensation systems, a mode locking laser receiving device is locked on a frequency reference signal transmitted at a local end by utilizing the optical frequency locking device at a far end, a frequency reference signal for bearing the practical noise information of an optical fiber link is recovered and is transmitted to the local end by utilizing the intensive wavelength division multiplexing transmission device, the local end digital compensation system is used for transmitting the obtained noise information to the far end again through the intensive wavelength division multiplexing transmission device, the far end digital compensation system is used for compensating the frequency reference signal at the far end according to the received noise information, and thus the stable frequency reference signal locked with a quantum frequency source is obtained. By the method disclosed by the invention, higher frequency transmission stability can be achieved in the long-distance and high-precision optical fiber frequency transmission process.
Description
Technical field
The present invention relates to Frequency Transfer system, particularly relate to a kind of Frequency Transfer system based on digital compensation system and transmission method thereof.
Background technology
Precise frequency transmits and clock synchronization system, i.e. time-frequency synchro system, in communication, control, space flight and national defence have extensive and important application, to be concerned with radio telescope array, the mapping of earth horizontal line etc. for the test of physical base present principles, the development of x-ray source of future generation, Long baselines.Traditional precise frequency transmission and method for synchronizing time have microwave communication, GPS, two-way satellite temporal frequency transmission TWSTFT technology etc.GPS needs to be averaged for a long time, and on average to fall the change of environmental condition in transmission path, the GPS accuracy of average a day can reach 10
-15, can not be provided for the short steady time signal of the necessary high accuracy of time synchronized, the time dissemination system therefore based on GPS does not have ability to transmit the light clock of new generation of high stable.
Compare and traditional precise frequency transmission and clock synchronization system, utilize the optical fiber of isolating with environment to build precise frequency transmission and clock synchronization system, there is larger stability, especially short-term stability.Take the initiative after stabilizing measures, direct optical frequency transmits the stability 3x10 that can reach in 1 second
-15.Fiber optic communication network, can utilize very ripe long distance Large Copacity optical communication technology and the flexible networking feature of optical-fiber network, under long distance or complicated Metro environment, carry out Time and Frequency Synchronization systematic research.Secondly, taking optical frequency as carrier, carry out broadcasting and time synchronized research of microwave frequency, is the technological trend that time-frequency transmits field.Modern Optics Technology can carry out high-precision regulation and control to the amplitude of optical frequency signal, phase place and waveform, simultaneously, relatively little by environmental interference when light carrier is propagated in fibre-optic waveguide, these all become the important foundation of carrying out precise frequency transmission and clock synchronization system with optical instrument.Even more important, be that the Time and Frequency Synchronization system of carrier makes the multiple spot of same frequency source broadcast to become possibility with light wave, abandon between traditional website and adopted different frequency source and the framework of comparing, decrease the quantity demand to frequency source, provide cost savings, and really accomplished that frequency coherence is synchronous, and precise frequency transmission and clock synchronization system can be realized on this basis.
Existing precise frequency transmission system adopts three kinds of modes: (1) directly transmits stable optical frequency, and which stability is high, but technical scheme very flexible, and a reference source needs light clock to lock, system complex and cost is high; (2) the rf frequency directly modulation Single wavelength laser in quantum frequency source transmits, and which realizes simple, but frequency short-term stability is poor; (3) transmit optics and rf frequency by transmitting mode-locked laser, the method combination property is outstanding, and system configuration is flexible simultaneously, realizes than being easier to, and is the main technology path considered in this research.
" the optical frequency com Frequency Transfer precision 3 × 10 by name that Giuseppe Marra, Helen S.Margolis, and David J.Richardson delivered in 2012 at optics news flash (OPTICSEXPRESS (OE))
-18" (Dissemination of an opticalfrequency comb over fiber with 3 × 10
-18fractional accuracy) paper in pre-compensation techniques is proposed, complete the compensation to link flapping at local side, obtain stable frequency at far-end.G.Marra, R.Slavik, H.S.Margolis, S.N.Lea, P.Petropoulos, D.J.Richardson, propose in the paper of " utilizing mode-locked laser 86km optical fiber High-precision Microwave Frequency Transfer " (High-resolution microwave frequencydissemination over an 86-km-long optical fiber network using a mode-locked laser) by name that P.Gill delivered at optics letter (Optical Letters) in 2011 and utilize the compensated fiber link shake of heating optical fiber pond, but the system balance reaction time is slow.
Summary of the invention
For above problems of the prior art, the present invention proposes a kind of Frequency Transfer system based on digital compensation system and transmission method thereof, digital compensation Systematical control mode-locked laser is utilized to produce high stable frequency, carry out the transmission of long distance and high precision optical fiber, and utilize the reference signal of digital compensation system to far-end to compensate.
One object of the present invention is to provide a kind of Frequency Transfer system based on digital compensation system.
Frequency Transfer system based on digital compensation system of the present invention comprises: local side, the first dense wavelength division multiplexing transfer device, optical fiber, the second dense wavelength division multiplexing transfer device and far-end; Local side is connected to one end of optical fiber by the first dense wavelength division multiplexing transfer device, and the other end of optical fiber is connected to far-end by the second dense wavelength division multiplexing transfer device; Wherein, local side comprises quantum frequency source, local side optical frequency locking device, mode-locked laser generation device and local side digital compensation system; Far-end comprises distal end optical frequency locker, mode-locked laser receiving system, far-end photodetector and remote digital bucking-out system; The reference frequency signal that local side optical frequency locking device sends according to quantum frequency source, contrasts with the frequency signal of mode-locked laser generation device, and the laser lock-on that control mode-locked laser generation device sends is on quantum frequency source; Mode-locked laser is carried in a passage of the first dense wavelength division multiplexing transfer device, is passed to distal end optical frequency locker by optical fiber and the second dense wavelength division multiplexing transfer device; Mode-locked laser receiving system is locked on the reference frequency signal of local side transmission according to the mode-locked laser received by distal end optical frequency locker, the mode-locked laser of the noise information that carry optical fiber link reality is carried in a passage of the second dense wavelength division multiplexing transfer device simultaneously, by optical fiber and the first dense wavelength division multiplexing transfer device, be passed to local side digital compensation system; The reference frequency signal of carrying noise information is obtained in the mode-locked laser that local side digital compensation system is distally transmitted, itself and quantum frequency source are compared, obtain noise information, and noise information is passed to remote digital bucking-out system through the first dense wavelength division multiplexing transfer device, optical fiber and the second dense wavelength division multiplexing transfer device; Remote digital bucking-out system, according to the noise information received, compensates the reference frequency signal through far-end photodetector of far-end, the reference frequency signal of stable output.
Local side digital compensation system comprises: local side photodetector, frequency mixer, single-chip microcomputer, controller and number pass element; Wherein, local side photoelectric detector distally returns the reference frequency signal that carry the noise information of optical fiber link reality come, and is passed to frequency mixer; The reference frequency signal that the reference frequency signal and quantum frequency source that carry the noise information of optical fiber link reality send compares by frequency mixer, and the result compared is passed to single-chip microcomputer; The result that single-chip microcomputer collection is compared, and biography changes digital signal transfers into controller; Controller processes digital signal, and assessment link flapping, determines compensating parameter, compensating parameter is passed to number and passes element; Number passes element and the digital signal of compensating parameter is converted to output noise information after optical signalling.
Remote digital bucking-out system comprises: number passes element, controller, single-chip microcomputer and frequency compensation element; Wherein, number passes element and converts the noise information received to digital signal, is passed to controller; Controller restoration and compensation parameter, utilizes Single-chip Controlling frequency compensation element to carry out frequency compensation to the reference frequency signal of far-end.
Mode-locked laser generation device comprises optical fiber mode locked laser and mode-locked laser repetition rate and atomic clock locking device; Wherein, optical fiber mode locked laser comprises wavelength division multiplexing collimater, quarter-wave plate, polarization beam apparatus, 1/2nd wave plates and gain fibre; Mode-locked laser repetition rate and atomic clock locking device are made up of PZT piezoelectric ceramic and driving power thereof.
Local side optical frequency locking device utilizes the method for balance cross-correlation optical fiber mode locked laser repetition rate to be locked on quantum frequency source, comprises optical ring cavity and balance photodetector.Optical ring cavity comprises two and takes advantage of two couplers, electrooptic modulation crystal, first collimator, the first Ferrari circulator, quarter-wave plate, the second Ferrari circulator, 1/2nd wave plates and the second collimater; The input of two couplers is taken advantage of in the output of optical fiber mode locked laser as two, the output in quantum frequency source is as the input of electrooptic modulation crystal, two take advantage of the output of two couplers as the input of balance photodetector, and two inputs of balance photodetector obtain error signal; Balance the input of output as frequency locker of photodetector.The structure of distal end optical frequency locker is the same with the structure of local side optical frequency locking device.
Mode-locked laser receiving system is that the photodetector of AC ~ 1GHz and frequency dividing circuit are formed by frequency response range, the optical signalling of the optical fiber mode locked laser that photoelectric detector is locked by distal end optical frequency locker, after filtering, frequency division, shaping circuit obtain the optical signalling of Frequency Locking, and the optical signal transfer of locking is returned local side by it then to utilize dense wavelength division multiplexing transfer device.
In order to compensate in long-distance optical fiber link transmittance process due to temperature, the delay variation that the change of the environmental parameters such as vibrations causes, the present invention adopts dense wavelength division multiplexing transfer device, optical frequency locking device and digital compensation system combine, optical frequency locking device is utilized to be locked on the reference frequency signal of local side transmission by mode-locked laser receiving system at far-end, recover the reference frequency signal of bearing fiber link actual noise information, and utilize the transmission of dense wavelength division multiplexing transfer device to return local side, for local side digital compensation system provides loop signal, the noise information obtained is delivered to far-end by dense wavelength division multiplexing transfer device by local side digital compensation system again, remote digital bucking-out system compensates reference frequency signal according to the noise information received.Principle is as follows: mode-locked laser generation device sends far-end as the carrier of reference frequency signal, its output signal is divided into two-way, wherein a road is as the input of local side optical frequency locking device, the phase place of locking laser, first dense wavelength division multiplexing transfer device of separately leading up to inputs in the optical fiber link of long distance and transmits, complete the reference frequency signal transmission to far-end, and provide loop feedback signal for gathering the noise information of optical fiber link, to complete stable fiber frequency loop; Local side digital compensation system utilizes quantum frequency source and loop feedback signal to obtain the noise information of optical fiber link, far-end is passed to by dense wavelength division multiplexing transfer device and optical fiber, remote digital bucking-out system receives the noise information that local side transmits, the reference frequency signal of far-end is compensated, obtains reference frequency signal that is stable, that lock with quantum frequency source.
Another object of the present invention is the transmission method providing a kind of Frequency Transfer system based on digital compensation system.
The transmission method of the Frequency Transfer system based on digital compensation system of the present invention, comprises the following steps:
1) reference frequency signal that sends according to quantum frequency source of local side optical frequency locking device, contrasts with the frequency signal of mode-locked laser generation device, controls laser lock-on that mode-locked laser generation device sends on quantum frequency source;
2) mode-locked laser is carried in a passage of the first dense wavelength division multiplexing transfer device, is passed to distal end optical frequency locker by optical fiber and the second dense wavelength division multiplexing transfer device;
3) mode-locked laser receiving system is locked on the reference frequency signal of local side transmission according to the mode-locked laser received by distal end optical frequency locker, the reference frequency signal of the noise information that carry optical fiber link reality is carried in a passage of the second dense wavelength division multiplexing transfer device simultaneously, by optical fiber and the first dense wavelength division multiplexing transfer device, be passed to local side digital compensation system;
4) reference frequency signal and quantum frequency source that carry the noise information of optical fiber link reality compare by local side digital compensation system, obtain noise information, and noise information is passed to remote digital bucking-out system through the first dense wavelength division multiplexing transfer device, optical fiber and the second dense wavelength division multiplexing transfer device;
5) remote digital bucking-out system is according to the noise information received, and compensates, the reference frequency signal of stable output to the reference frequency signal through far-end photodetector of far-end.
Wherein, in step 4) in, local side photoelectric detector distally returns the reference frequency signal that carry the noise information of optical fiber link reality come, and is passed to frequency mixer; The reference frequency signal that the reference frequency signal and quantum frequency source that carry the noise information of optical fiber link reality send compares by frequency mixer, and the result compared is passed to single-chip microcomputer; The result that single-chip microcomputer collection is compared, and biography changes digital signal transfers into controller; Controller processes digital signal, and assessment link flapping, determines compensating parameter, compensating parameter is passed to number and passes element; Number passes element and the digital signal of compensating parameter is converted to output noise information after optical signalling.
In step 5) in, number passes element and converts the noise information received to digital signal, is passed to controller; Controller restoration and compensation parameter, utilizes Single-chip Controlling frequency compensation element, carries out frequency compensation to the reference frequency signal through far-end photodetector of far-end.
Advantage of the present invention:
The present invention adopts dense wavelength division multiplexing transfer device, optical frequency locking device and digital compensation system combine, optical frequency locking device is utilized to be locked on the reference frequency signal of local side transmission by mode-locked laser receiving system at far-end, recover the reference frequency signal of the noise information of bearing fiber link reality, and utilize the transmission of dense wavelength division multiplexing transfer device to return local side, for local side digital compensation system provides loop signal, the noise information obtained is delivered to far-end by dense wavelength division multiplexing transfer device by local side digital compensation system again, remote digital bucking-out system compensates according to the reference frequency signal of the noise information received to far-end, thus obtain stable, the reference frequency signal locked with quantum frequency source.Method of the present invention can reach higher Frequency Transfer stability in long distance and high precision optical fiber Frequency Transfer process.Meanwhile, this method also can be applied to the mode directly transmitting stable optical frequency and the mode transmitting rf frequency modulation Single wavelength laser, can obtain good performance equally.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the Frequency Transfer system based on digital compensation system of the present invention;
Fig. 2 is the flow chart of the transmission method of the Frequency Transfer system based on digital compensation system of the present invention;
Fig. 3 is the frequency stability curve chart of the reference frequency signal that the far-end of the Frequency Transfer system based on digital compensation system of the present invention obtains;
Fig. 4 is the phase noise spectrum of the reference frequency signal that the far-end of an embodiment of the Frequency Transfer system based on digital compensation system of the present invention obtains.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the present invention will be further described.
As shown in Figure 1, the Frequency Transfer system based on digital compensation system of the present invention comprises: local side, the first dense wavelength division multiplexing transfer device, optical fiber, the second dense wavelength division multiplexing transfer device and far-end; Local side is connected to one end of optical fiber by the first dense wavelength division multiplexing transfer device, and the other end of optical fiber is connected to far-end by the second dense wavelength division multiplexing transfer device; Wherein, local side comprises quantum frequency source, local side optical frequency locking device, mode-locked laser generation device and local side digital compensation system; Far-end comprises distal end optical frequency locker, mode-locked laser receiving system, far-end photodetector and remote digital bucking-out system.
The reference frequency signal that local side optical frequency locking device sends according to quantum frequency source, contrasts with the frequency signal of mode-locked laser generation device, and the laser lock-on that control mode-locked laser generation device sends is on quantum frequency source; Mode-locked laser is carried in a passage of the first dense wavelength division multiplexing transfer device, is passed to distal end optical frequency locker by optical fiber and the second dense wavelength division multiplexing transfer device; Mode-locked laser receiving system is locked on the reference frequency signal of local side transmission according to the mode-locked laser received by distal end optical frequency locker, the reference frequency signal of the noise information that carry optical fiber link reality is carried in a passage of the second dense wavelength division multiplexing transfer device simultaneously, by optical fiber and the first dense wavelength division multiplexing transfer device, be passed to local side digital compensation system; Itself and quantum frequency source compare by local side digital compensation system, obtain noise information, and noise information is passed to remote digital bucking-out system through the first dense wavelength division multiplexing transfer device, optical fiber and the second dense wavelength division multiplexing transfer device; Remote digital bucking-out system compensates according to the reference frequency signal of the noise information received to far-end, the reference frequency signal of stable output.
Local side digital compensation system comprises: photodetector, frequency mixer, single-chip microcomputer, controller and number pass element; Wherein, photoelectric detector distally returns the reference frequency signal that carry the noise information of optical fiber link reality come, and is passed to frequency mixer; The reference frequency signal that the reference frequency signal and quantum frequency source that carry the noise information of optical fiber link reality send compares by frequency mixer, and the result compared is passed to single-chip microcomputer; The result that single-chip microcomputer collection is compared, and biography changes digital signal transfers into controller; Controller processes digital signal, and assessment link flapping, determines compensating parameter, compensating parameter is passed to number and passes element; Number passes element and the digital signal of compensating parameter is converted to output noise information after optical signalling.
Remote digital bucking-out system comprises: number passes element, controller, single-chip microcomputer and frequency compensation element; Wherein, number passes element and converts the noise information received to digital signal, is passed to controller; Controller restoration and compensation parameter, utilizes Single-chip Controlling frequency compensation element to carry out frequency compensation to the reference frequency signal of far-end.
Mode-locked laser generation device comprises optical fiber mode locked laser and mode-locked laser repetition rate and atomic clock locking device; Wherein, optical fiber mode locked laser comprises first collimator, the first quarter-wave plate, the 1/1st wave plate, the first polarizing beam splitter mirror, the first isolator, the second quarter-wave plate, the second collimater, gain fibre, the second isolator and the 3rd collimater, and the first pumping source is connected with the afterbody of first collimator; Wherein, first collimator, the first quarter-wave plate, the 1/1st wave plate, the first polarizing beam splitter mirror, the first isolator, the second quarter-wave plate, the second collimater and gain fibre successively optics be connected to form optical ring cavity.Mode-locked laser repetition rate and atomic clock locking device are made up of PZT piezoelectric ceramic and driving power thereof.The frequency of mode-locked laser repetition rate and atomic clock locking device is 10MHz.Mode-locked laser repetition rate locks together with the 10MHz reference frequency signal in quantum frequency source.
First optical frequency locking device utilizes the method for balance cross-correlation optical fiber mode locked laser repetition rate to be locked on quantum frequency source, comprises optical ring cavity and balance photodetector.Optical ring cavity comprises two and takes advantage of two couplers, electrooptic modulation crystal, first collimator, the first Ferrari circulator, quarter-wave plate, the second Ferrari circulator, 1/2nd wave plates and the second collimater; The input of two couplers is taken advantage of in the output of optical fiber mode locked laser as two, the output in quantum frequency source is as the input of electrooptic modulation crystal, two take advantage of the output of two couplers as the input of balance photodetector, and two inputs of balance photodetector obtain error signal; Balance the input of output as frequency locker of photodetector.The structure of the second optical frequency locking device is identical with the structure of the first optical frequency locking device.
Mode-locked laser receiving system is that the photodetector of AC ~ 1GHz and frequency dividing circuit are formed by frequency response range, the optical signalling of the optical fiber mode locked laser that photoelectric detector is locked by distal end optical frequency locker, after filtering, frequency division, shaping circuit obtain the optical signalling of Frequency Locking, and the optical signal transfer of locking is returned local side by it then to utilize the second dense wavelength division multiplexing transfer device, optical fiber and the first dense wavelength division multiplexing transfer device.
The transmission method of the Frequency Transfer system based on digital compensation system of the present embodiment, as shown in Figure 2, comprises the following steps:
1) reference frequency signal that sends according to quantum frequency source of local side optical frequency locking device, contrasts with the frequency signal of mode-locked laser generation device, controls laser lock-on that mode-locked laser generation device sends on quantum frequency source;
2) mode-locked laser is carried in a passage of the first dense wavelength division multiplexing transfer device, is passed to distal end optical frequency locker by optical fiber and the second dense wavelength division multiplexing transfer device;
3) mode-locked laser receiving system is locked on the reference frequency signal of local side transmission according to the mode-locked laser received by distal end optical frequency locker, the reference frequency signal of the noise information that carry optical fiber link reality is carried in a passage of the second dense wavelength division multiplexing transfer device simultaneously, by optical fiber and the first dense wavelength division multiplexing transfer device, be passed to local side digital compensation system;
4) reference frequency signal and quantum frequency source that carry the noise information of optical fiber link reality compare by local side digital compensation system, obtain noise information, and noise information is passed to remote digital bucking-out system through the first dense wavelength division multiplexing transfer device, optical fiber and the second dense wavelength division multiplexing transfer device;
5) remote digital bucking-out system is according to the noise information received, and compensates, the reference frequency signal of stable output to the reference frequency signal through far-end photodetector of far-end.
Fig. 3 is the frequency stability curve chart of the reference frequency signal that the far-end of the Frequency Transfer system based on digital compensation system of the present invention obtains, as shown in Figure 3, native system can due to frequency error that the reasons such as temperature cause in effective compensation optical fiber link, obtain good frequency stability, possess good short-term stability and long-term stability simultaneously.
Fig. 4 is the phase noise spectrum of the reference frequency signal that the far-end of an embodiment of the Frequency Transfer system based on digital compensation system of the present invention obtains, and as shown in Figure 4, native system effectively can suppress the phase noise due to reason generations such as temperature in link.
It is finally noted that, the object publicizing and implementing mode is to help to understand the present invention further, but it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, various substitutions and modifications are all possible.Therefore, the present invention should not be limited to the content disclosed in embodiment, and the scope that the scope of protection of present invention defines with claims is as the criterion.
Claims (7)
1. based on a Frequency Transfer system for digital compensation system, it is characterized in that, described Frequency Transfer system comprises: local side, the first dense wavelength division multiplexing transfer device, optical fiber, the second dense wavelength division multiplexing transfer device and far-end; Local side is connected to one end of optical fiber by the first dense wavelength division multiplexing transfer device, and the other end of optical fiber is connected to far-end by the second dense wavelength division multiplexing transfer device; Wherein, local side comprises quantum frequency source, local side optical frequency locking device, mode-locked laser generation device and local side digital compensation system; Far-end comprises distal end optical frequency locker, mode-locked laser receiving system, far-end photodetector and remote digital bucking-out system; The reference frequency signal that local side optical frequency locking device sends according to quantum frequency source, contrasts with the frequency signal of mode-locked laser generation device, and the laser lock-on that control mode-locked laser generation device sends is on quantum frequency source; Mode-locked laser is carried in a passage of the first dense wavelength division multiplexing transfer device, is passed to distal end optical frequency locker by optical fiber and the second dense wavelength division multiplexing transfer device; Mode-locked laser receiving system is locked on the reference frequency signal of local side transmission according to the mode-locked laser received by distal end optical frequency locker, the mode-locked laser of the noise information that carry optical fiber link reality is carried in a passage of the second dense wavelength division multiplexing transfer device simultaneously, by optical fiber and the first dense wavelength division multiplexing transfer device, be passed to local side digital compensation system; The reference frequency signal of carrying noise information is obtained in the mode-locked laser that local side digital compensation system is distally transmitted, itself and quantum frequency source are compared, obtain noise information, and noise information is passed to remote digital bucking-out system through the first dense wavelength division multiplexing transfer device, optical fiber and the second dense wavelength division multiplexing transfer device; Remote digital bucking-out system, according to the noise information received, compensates the reference frequency signal through far-end photodetector of far-end, the reference frequency signal of stable output.
2. Frequency Transfer system as claimed in claim 1, it is characterized in that, described local side digital compensation system comprises: local side photodetector, frequency mixer, single-chip microcomputer, controller and number pass element; Wherein, local side photoelectric detector distally returns the reference frequency signal that carry the noise information of optical fiber link reality come, and is passed to frequency mixer; The reference frequency signal that the reference frequency signal and quantum frequency source that carry the noise information of optical fiber link reality send compares by frequency mixer, and the result compared is passed to single-chip microcomputer; The result that single-chip microcomputer collection is compared, and biography changes digital signal transfers into controller; Controller processes digital signal, and assessment link flapping, determines compensating parameter, compensating parameter is passed to number and passes element; Number passes element and the digital signal of compensating parameter is converted to output noise information after optical signalling.
3. Frequency Transfer system as claimed in claim 1, it is characterized in that, described remote digital bucking-out system comprises: number passes element, controller, single-chip microcomputer and frequency compensation element; Wherein, number passes element and converts the noise information received to digital signal, is passed to controller; Controller restoration and compensation parameter, utilizes Single-chip Controlling frequency compensation element to carry out frequency compensation to the reference frequency signal of far-end.
4. Frequency Transfer system as claimed in claim 1, is characterized in that, described mode-locked laser generation device comprises optical fiber mode locked laser and mode-locked laser repetition rate and atomic clock locking device; Wherein, optical fiber mode locked laser comprises wavelength division multiplexing collimater, quarter-wave plate, polarization beam apparatus, 1/2nd wave plates and gain fibre; Mode-locked laser repetition rate and atomic clock locking device are made up of PZT piezoelectric ceramic and driving power thereof.
5. based on a transmission method for the Frequency Transfer system of digital compensation system, it is characterized in that, described transmission method comprises the following steps:
1) reference frequency signal that sends according to quantum frequency source of local side optical frequency locking device, contrasts with the frequency signal of mode-locked laser generation device, controls laser lock-on that mode-locked laser generation device sends on quantum frequency source;
2) mode-locked laser is carried in a passage of the first dense wavelength division multiplexing transfer device, is passed to distal end optical frequency locker by optical fiber and the second dense wavelength division multiplexing transfer device;
3) mode-locked laser receiving system is locked on the reference frequency signal of local side transmission according to the mode-locked laser received by distal end optical frequency locker, the reference frequency signal of the noise information that carry optical fiber link reality is carried in a passage of the second dense wavelength division multiplexing transfer device simultaneously, by optical fiber and the first dense wavelength division multiplexing transfer device, be passed to local side digital compensation system;
4) reference frequency signal and quantum frequency source that carry the noise information of optical fiber link reality compare by local side digital compensation system, obtain noise information, and noise information is passed to remote digital bucking-out system through the first dense wavelength division multiplexing transfer device, optical fiber and the second dense wavelength division multiplexing transfer device;
5) remote digital bucking-out system is according to the noise information received, and compensates, the reference frequency signal of stable output to the reference frequency signal through far-end photodetector of far-end.
6. transmission method as claimed in claim 5, is characterized in that, in step 4) in, local side photoelectric detector distally returns the reference frequency signal that carry the noise information of optical fiber link reality come, and is passed to frequency mixer; The reference frequency signal that the reference frequency signal and quantum frequency source that carry the noise information of optical fiber link reality send compares by frequency mixer, and the result compared is passed to single-chip microcomputer; The result that single-chip microcomputer collection is compared, and biography changes digital signal transfers into controller; Controller processes digital signal, and assessment link flapping, determines compensating parameter, compensating parameter is passed to number and passes element; Number passes element and the digital signal of compensating parameter is converted to output noise information after optical signalling.
7. transmission method as claimed in claim 5, is characterized in that, in step 5) in, number passes element and converts the noise information received to digital signal, is passed to controller; Controller restoration and compensation parameter, utilizes Single-chip Controlling frequency compensation element, carries out frequency compensation to the reference frequency signal through far-end photodetector of far-end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410779831.3A CN104506297A (en) | 2014-12-16 | 2014-12-16 | Frequency transmission system based on digital compensation systems, and transmission method of frequency transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410779831.3A CN104506297A (en) | 2014-12-16 | 2014-12-16 | Frequency transmission system based on digital compensation systems, and transmission method of frequency transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104506297A true CN104506297A (en) | 2015-04-08 |
Family
ID=52948013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410779831.3A Pending CN104506297A (en) | 2014-12-16 | 2014-12-16 | Frequency transmission system based on digital compensation systems, and transmission method of frequency transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104506297A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901743A (en) * | 2015-05-04 | 2015-09-09 | 中国科学院国家授时中心 | Fiber optical frequency transmission method based on compensation of remote end |
| CN109616859A (en) * | 2019-01-29 | 2019-04-12 | 中山铟尼镭斯科技有限公司 | A kind of optical fiber femtosecond laser |
| CN110149562A (en) * | 2019-04-19 | 2019-08-20 | 中国计量科学研究院 | Optical fiber single channel temporal frequency high-precision transmitting intermediate node device |
| CN110808806A (en) * | 2019-11-04 | 2020-02-18 | 中国科学院国家授时中心 | Quantum bidirectional time synchronization method and system based on optical fiber frequency transmission |
| CN112671457A (en) * | 2020-12-03 | 2021-04-16 | 北京无线电计量测试研究所 | Double-base-station radar reference frequency synchronization system and method |
| CN113098622A (en) * | 2021-03-14 | 2021-07-09 | 北京邮电大学 | Frequency transfer device based on bidirectional phase jitter compensation of optical frequency comb |
| CN113541818A (en) * | 2021-07-15 | 2021-10-22 | 成都金诺信高科技有限公司 | Underwater frequency transmission method and system based on active phase compensation |
| CN114337825A (en) * | 2021-12-16 | 2022-04-12 | 成都天奥电子股份有限公司 | Reciprocating frequency conversion type optical fiber microwave frequency transmission system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169210A (en) * | 2011-03-30 | 2011-08-31 | 北京大学 | Optical fiber wavelength division multiplexing device and annular cavity optical fiber laser containing same |
| CN102576971A (en) * | 2009-10-02 | 2012-07-11 | Imra美国公司 | Optical signal processing with modelocked lasers |
-
2014
- 2014-12-16 CN CN201410779831.3A patent/CN104506297A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102576971A (en) * | 2009-10-02 | 2012-07-11 | Imra美国公司 | Optical signal processing with modelocked lasers |
| CN102169210A (en) * | 2011-03-30 | 2011-08-31 | 北京大学 | Optical fiber wavelength division multiplexing device and annular cavity optical fiber laser containing same |
Non-Patent Citations (6)
| Title |
|---|
| BO NING等: "Phase fluctuation compensation for long-term transfer of stable radio frequency over fiber link", 《OPTICS EXPRESS》 * |
| ZHIGANG ZHANG等: "Long-term stable frequency transfer over an urban fiber link using microwave phase stabilization", 《OPTICAL SOCIETY OF AMERICA》 * |
| 曾华燊: "《现代网络通信技术》", 31 January 2004 * |
| 李玉权: "《光波导理论与技术》", 31 December 2002 * |
| 陆燕飞等: "《数字电视有线传输原理与维修 第2版》", 30 June 2011 * |
| 马金喜: "《电子元器件与电子实习》", 30 September 2006 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901743A (en) * | 2015-05-04 | 2015-09-09 | 中国科学院国家授时中心 | Fiber optical frequency transmission method based on compensation of remote end |
| CN104901743B (en) * | 2015-05-04 | 2018-02-23 | 中国科学院国家授时中心 | A kind of optical fiber optical frequency transmission method based on long-range end compensating |
| CN109616859A (en) * | 2019-01-29 | 2019-04-12 | 中山铟尼镭斯科技有限公司 | A kind of optical fiber femtosecond laser |
| CN110149562A (en) * | 2019-04-19 | 2019-08-20 | 中国计量科学研究院 | Optical fiber single channel temporal frequency high-precision transmitting intermediate node device |
| CN110149562B (en) * | 2019-04-19 | 2022-01-25 | 中国计量科学研究院 | Optical fiber single-channel time frequency high-precision transmission intermediate node device |
| CN110808806A (en) * | 2019-11-04 | 2020-02-18 | 中国科学院国家授时中心 | Quantum bidirectional time synchronization method and system based on optical fiber frequency transmission |
| CN112671457A (en) * | 2020-12-03 | 2021-04-16 | 北京无线电计量测试研究所 | Double-base-station radar reference frequency synchronization system and method |
| CN113098622A (en) * | 2021-03-14 | 2021-07-09 | 北京邮电大学 | Frequency transfer device based on bidirectional phase jitter compensation of optical frequency comb |
| CN113098622B (en) * | 2021-03-14 | 2022-01-28 | 北京邮电大学 | Frequency transfer device based on bidirectional phase jitter compensation of optical frequency comb |
| CN113541818A (en) * | 2021-07-15 | 2021-10-22 | 成都金诺信高科技有限公司 | Underwater frequency transmission method and system based on active phase compensation |
| CN114337825A (en) * | 2021-12-16 | 2022-04-12 | 成都天奥电子股份有限公司 | Reciprocating frequency conversion type optical fiber microwave frequency transmission system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104506297A (en) | Frequency transmission system based on digital compensation systems, and transmission method of frequency transmission system | |
| CN106877930B (en) | High-precision optical fiber frequency Transmission system | |
| US8078060B2 (en) | Optical synchronization system for femtosecond X-ray sources | |
| CN107682087B (en) | A kind of steady phase transmission method of microwave optical fiber for eliminating local oscillator leakage in passive phase correction | |
| Pan et al. | Passive phase correction for stable radio frequency transfer via optical fiber | |
| Hu et al. | A 300-kilometer optical fiber time transfer using bidirectional TDM dissemination | |
| CN103634093A (en) | Microwave distance measurement and time synchronization system and method based on frequency synchronization | |
| CN111342899B (en) | Optical fiber conjugate phase-stable transmission method | |
| CN106301576A (en) | A kind of multi-frequency multiple spot microwave optical fiber steady phase transmission method based on passive phase correction | |
| CN105446120A (en) | Optical fiber link time-frequency distribution device based on femtosecond laser and stabilizing method thereof | |
| Zuo et al. | Multiple-node time synchronization over hybrid star and bus fiber network without requiring link calibration | |
| JP6045192B2 (en) | Optical fiber microwave transmission device and composite optical fiber microwave transmission device | |
| Akiyama et al. | Phase stabilized RF reference signal dissemination over optical fiber employing instantaneous frequency control by VCO | |
| Zuo et al. | WDM-based fiber-optic time synchronization without requiring link calibration | |
| Sotiropoulos et al. | Delivering 10 Gb/s optical data with picosecond timing uncertainty over 75 km distance | |
| CN113708878B (en) | Optical fiber-based time and frequency simultaneous transmission system and method | |
| CN103873149B (en) | A kind of high-precision optical fiber frequency transmission method | |
| Tratnik et al. | Fiber length compensated transmission of 2998.01 MHz RF signal with femtosecond precision | |
| Siebrits et al. | Dissemination of reference signals for a next generation radio telescope | |
| CN108566259A (en) | A kind of phase jitter compensation method and compensation system | |
| Zhang et al. | Phase stable radio distribution over optic cable by phase conjugation using an optical frequency comb | |
| Chen et al. | Time reversal enabled fiber-optic time synchronization | |
| Zhang et al. | Stable radio transfer via an optic cable with multiple fibers based on passive phase error correction | |
| Hendre | Precise frequency and time transfer for the square kilometer array | |
| Wilcox et al. | Systems design concepts for optical synchronization in accelerators |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150408 |