CN108092721A - A kind of algorithm and device that can eliminate phase error in fiber link - Google Patents
A kind of algorithm and device that can eliminate phase error in fiber link Download PDFInfo
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- CN108092721A CN108092721A CN201711435846.8A CN201711435846A CN108092721A CN 108092721 A CN108092721 A CN 108092721A CN 201711435846 A CN201711435846 A CN 201711435846A CN 108092721 A CN108092721 A CN 108092721A
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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
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Abstract
The present invention relates to a kind of method and apparatus for eliminating phase error in fiber link, belong to optical fiber radio frequency signal transmitted data field.It is disclosed including local oscillator, positive one way link and reversed one way link, local oscillator is connected to the first photo-coupler of positive one way link, local oscillator is also connected to the input terminal of frequency tripler, the output terminal of its output terminal and reversed one way link is connected respectively to the input terminal of frequency mixer, the output terminal of frequency mixer is connected to the input terminal of the first photo-coupler, one output terminal of the 3rd photo-coupler of positive one way link is connected to the second photodetector, second photodetector output terminal is connected to the second bandpass filter, second bandpass filter output terminal is connected to 1/2 frequency divider.It is an advantage of the invention that optical fiber telecommunications system can not only be reached while eliminating phase error using it but also can greatly save cost.
Description
Technical field
The present invention relates to optical fiber radio frequency signal transmitted data fields, are that one kind can be eliminated in fiber link specifically
The method and apparatus of phase error.
Background technology
Using optical fiber radio frequency signal transmitted data in wireless astronomy, deep space network, distributed SAR system
System, high precision clock standard profile, particle accelerator and global navigation and position system etc. have many applications,
In, multiple antenna receiver is positioned and navigated using multicarrier phase system, and radiofrequency signal (RF) and local carrier signal need
The other end is transmitted to stable phase.Optical fiber have low-loss, it is light-weight, at low cost, can resist electromagnetic interference and
The advantages of many other very more, for the propagation of radiofrequency signal, optical fiber is best transmission medium, especially over long distances
Optical fiber transmission, the variation of variation and temperature yet with environment, the length of optical fiber can arbitrarily be changed.In order to
More steadily transmitting radio frequency signal (RF), the phase place change as caused by fiber link should be subject in real time in fiber link
Correction.It can be seen that in numerous applications, it is to pass that can obtain a highly stable and accurate radiofrequency signal (RF)
Important.Optical fiber transmission has for traditional satellite transmission in terms of stability to have an enormous advantage, yet with
Environment micro-turbulence, this will reduce the stability that radiofrequency signal (RF) is propagated.
Recent decades, there are many schemes for eliminating phase error in fiber link to be suggested.It is for example, straight in the electronic device
Connect elimination phase drift, such as voltage controlled oscillator or the mode-locked laser that cavity length can be directly changed in optical device
Device may be implemented in the very short time by these methods and be penetrated using larger compensation range to obtain with high stability
Frequency signal.However electronics or optical voltage controlled oscillator (VCOS) they are limit bandwidth, and phasing is not really to prolong
The correction of slow time, so causes that broadband signal cannot be transmitted in fiber link.Therefore synchronously believe to be obtained in distal end
It number must increase additional fiber link i.e. variable optical delay line, variable optical delay line has the extremely short response time, also therefore
It is widely used.Since there is the single mode optical fiber of standard thermal sensitivity to be easily influenced by temperature, so transmit tens of
Kilometer just needs sizable adjustable range.Thermal control optical fiber has extraordinary reliability, is often used in extension adjustable range, but
It is the increase that systems stabilisation will bring cost using it, and is unsuitable on antenna.
The content of the invention
The application provides a kind of device for eliminating phase error in fiber link, including local oscillator, positive one way chain
Road and reversed one way link, local oscillator are connected to the first photo-coupler of positive one way link, and local oscillator is also connected with
To the input terminal of frequency tripler, the output terminal of output terminal and reversed one way link is connected respectively to the input terminal of frequency mixer, mixes
The output terminal of frequency device is connected to the input terminal of the first photo-coupler, an output terminal of the 3rd photo-coupler of positive one way link
The second photodetector is connected to, the second photodetector output terminal is connected to the second bandpass filter, the second bandpass filter
Output terminal is connected to 1/2 frequency divider.
The forward direction one way link includes laser, electrooptic modulator, the second photo-coupler, near-end optical circulator, optical fiber
Link, distal end optical circulator, distal end erbium-doped fiber amplifier, the 3rd photo-coupler, the first photodetector, the first bandpass filtering
Device, and be sequentially connected, the output terminal of local oscillator connects the first photo-coupler, and the output terminal of the first photo-coupler is connected to electricity
Optical modulator, the output terminal connection offset controller of the second photo-coupler, the output terminal of offset controller are connected to electric light
Modulator.
The reversed one way link includes distal end optical circulator, fiber link, near-end optical circulator, near-end Er-doped fiber and puts
Big device, near-end photodetector, near-end bandpass filter, and be sequentially connected.
The application also provides a kind of method for eliminating phase error in fiber link, and eliminating phase using the method for mixing misses
Difference realizes the transmission of radiofrequency signal point-to-point.
Assuming that local oscillated signal (LO) is by A0It represents, can be represented as：
In order to illustrate the generality of signal, whereinFor fixed random initial phase.Signal A0By the first optical coupling
Device, electrooptic modulator, the second photo-coupler, near-end optical circulator, fiber link, using the ring of light row distally rotated counterclockwise
Device (optical circulator), distal end erbium-doped fiber amplifier, the 3rd photo-coupler, the first photodetector, Ran Houjing
First band-pass filter.If the signal of the first bandpass filter output terminal is A1, by prolonging for positive one way fiber link
It lags, A1It can be represented as：
Wherein τ is the time delay of one way link (signal proximally passes to distal end).Signal A1By what is rotated counterclockwise
Distal end optical circulator transfers back to near-end, and optical signal is detected after the amplification of near-end erbium-doped fiber amplifier by near-end photodetector
To near-end band-pass filter is passed through, if the output of near-end bandpass filter is A2, A2It may be expressed as：
Wherein 2 τ are to add the time delay (signal from distally pass back to near-end again) of second single times of journey and local shake
Signal is swung by using A after 3 frequencys multiplication3It represents：
Signal A2With A3It is mixed in frequency mixer (mixer), frequency conversion, the output signal A of frequency mixer4It represents, A4It can quilt
It is expressed as：
This signal through being coupled into electrooptic modulator be modulated be then delivered to distal end.Into amplification excessively, detection, filter
It can obtain signal A after ripple5, this signal be bandpass filter output, A5It may be expressed as：
Above formula arrangement can obtain：
This is because signal A4After single times of journey fiber link of third time (proximally passing to distal end again) transmission and have
One time delay is τ.Electric signal A5It can be obtained after being divided using half with local oscillated signal with the same phase of frequency
Signal A6, A6It can be represented as：
It can clearly find out electric signal A0With A6With the same phase of frequency, that is, radiofrequency signal phase error of getting along is achieved the purpose that.
Local oscillated signal (local reference signal) A that the oscillator of the application generates0It is right into electrooptic modulator (EOM)
Laser (LD) generates and is input to the optical signal of electrooptic modulator and is modulated.Modulated signal enters the second photo-coupler, the
One of output end signal of two photo-couplers as feedback signal enter offset controller be used for compensate electrooptic modulator because
Inherent drift caused by aging or environmental change.Another output end signal of second photo-coupler 2 enters what is rotated clockwise
Near-end optical circulator, from the structure of near-end optical circulator, this signal will not be transferred into downwards near-end Er-doped fiber and put
Big device, but enter and be capable of the fiber link of transmitted in both directions, then by distal end optical circulator, distal end erbium-doped fiber amplifier to
Lower transmission enters the 3rd photo-coupler by distal end erbium-doped fiber amplifier by the signal after power amplification.3rd optical coupling
Two photodetectors (selection index system with frequency and wavelength) are connected to below device, transmission signal is through the 3rd photo-coupler
Output port selection is into the first photodetector, then by the first bandpass filtering, distal end optical circulator, bidirectional fiber link
Back to the optical circulator of near-end, signal can be along near-end erbium-doped fiber amplifier, near-end photodetector, near-end band logical at this time
Wave filter (is regioselective in order to illustrate the two proximally and distally using identical photodetector and bandpass filter
Signal frequency and filtered band are all identical), the signal A exported at this time2With generated by oscillator and pass through frequency tripler frequency tripling
Signal A3Being mixed (output signal selection down coversion --- difference frequency) into frequency mixer obtains signal A simultaneously4, pay attention at this time
Signal A4Frequency be local signal A02 times, delay is τ, and process and A0Identical path reaches distal end optical circulator,
The delay that delay at this time has been brought by fiber link is completely counterbalanced by, then using distal end erbium-doped fiber amplifier, the 3rd light
Coupler, but the signal of the left output terminal output of the 3rd photo-coupler at this time enters the second photodetector, the second bandpass filter
The signal A6 of phase stabilization is just obtained using 1/2 frequency dividing.
The present invention is to provide a kind of time delays using in fiber link to improve transmitted radiofrequency signal phase
The scheme of stability.This programme is travelled to and fro between by radiofrequency signal between intermediate node and distal end to obtain a time delay, without
Extra link and fibre delay line must be increased, only need to increase necessary device in transmitting terminal and receiving terminal can eliminate optical fiber chain
The phase error of radiofrequency signal in road.Optical fiber telecommunications system use it, can not only reach eliminate phase error while but also can
To greatly save cost.
Description of the drawings
Fig. 1 is the organigram of the specific embodiment of the invention.
Specific embodiment
Fig. 1 shows the installation drawing of the present embodiment, and the output terminal of local oscillator LO is connected to the coupling of the first photo-coupler OC1
End is closed, local oscillator LO is also connected to the input terminal of frequency tripler, laser LD, electrooptic modulator EOM, the second photo-coupler
OC2, near-end optical circulator, fiber link, distal end optical circulator, distal end erbium-doped optical fiber amplifier EDFA 1, the 3rd photo-coupler
OC3, the first photoelectric detector PD 1, the first bandpass filter BPF1 are sequentially connected, near-end optical circulator also with near-end Er-doped fiber
Amplifier EDFA0 connections, the output terminal of near-end erbium-doped optical fiber amplifier EDFA 0 are connected with near-end photoelectric detector PD 0, near-end light
The output terminal of electric explorer PD0 is connected with the input terminal of near-end bandpass filter BPF0, the output terminal and proximal band of frequency tripler
The output terminal of bandpass filter BPF0 is connected respectively to the input terminal of frequency mixer, and the output terminal of frequency mixer is connected to the first photo-coupler
The input terminal of OC1.The output terminal of first photo-coupler OC1 is connected to electrooptic modulator EOM, one of the second photo-coupler OC2
Output terminal connects offset controller BC, and the output terminal of offset controller BC is connected to electrooptic modulator EOM, the 3rd photo-coupler
An output terminal of OC3 connects the second photoelectric detector PD 2, and 2 output terminal of the second photoelectric detector PD is connected to the filter of the second band logical
Ripple device BPF2, the second bandpass filter BPF2 output terminals are connected to 1/2 frequency divider.
The local oscillated signal of the present embodiment is by A0It represents, can be represented as：
In order to illustrate the generality of signal, whereinFor fixed random initial phase.Signal A0By the first optical coupling
Device OC1, electrooptic modulator EOM, the second photo-coupler OC2, near-end optical circulator, fiber link, using distal end rotation counterclockwise
Turn optical circulator, distal end erbium-doped optical fiber amplifier EDFA 1, the 3rd photo-coupler OC3, the first photoelectric detector PD 1, Ran Houjing
First bandpass filter BPF1 is filtered.If the signal of the first bandpass filter BPF1 output terminals is A1, by positive one way optical fiber
After the delay of link, A1It can be represented as：
Wherein τ is the time delay of one way link (signal proximally passes to distal end).Signal A1By what is rotated counterclockwise
Distal end optical circulator transfers back to near-end, and optical signal is after the amplification of near-end erbium-doped optical fiber amplifier EDFA 0 by near-end photodetection
Device PD0 is detected to be filtered by near-end bandpass filter BPF0, if the output of near-end bandpass filter BPF0 is A2, A2It can be by table
It is shown as：
Wherein 2 τ are to add the time delay (signal from distally pass back to near-end again) of second single times of journey and local shake
Swing signal A0By using A after 3 frequencys multiplication3It represents：
Signal A2With A3It is mixed in frequency mixer (mixer), frequency conversion, the output signal A of frequency mixer (mixer)4Table
Show, A4It may be expressed as：
This signal by the first photo-coupler OC1 be coupled into electrooptic modulator EOM be modulated be then delivered to it is remote
End.Amplify by distal end erbium-doped optical fiber amplifier EDFA 1, the second photoelectric detector PD 2 detects, the second bandpass filter BPF2 filters
It can obtain signal A after ripple5, A5It may be expressed as：
Above formula arrangement can obtain：
This is because signal A4After single times of journey fiber link of third time (proximally passing to distal end again) transmission and have
One time delay is τ.Electric signal A5It can be obtained after being divided using half with local oscillated signal with the same phase of frequency
Signal A6, A6It can be represented as：
It can clearly find out electric signal A0With A6With the same phase of frequency, that is, achieve the purpose that eliminate radiofrequency signal phase error.
The thinking of the present invention is discussed in detail in above example；Meanwhile for those of ordinary skill in the art, according to
According to the principle of the present invention, can change in specific embodiments and applications, this specification content should not be construed as
Limitation of the present invention.
Claims (5)
- A kind of 1. method that can eliminate phase error in fiber link, it is characterised in that：Comprise the following steps：Step 1)：It is A to make local oscillated signal0, then For random initial phase；Step 2)：Signal A0The signal exported after the positive one way link of proximal fiber to distal end is A1,τ is the time delay of one way link；Step 3)：Signal A1After the reversed one way link of fiber distal end to near-end, the signal of output is A2,2 τ are the time delays for adding second single times of journey；Step 4)：Local oscillated signal after frequency tripling by using A3It represents：Step 5)：Signal A2With A3It is mixed in frequency mixer, the output signal of frequency mixer is A4,Step 6)：Signal A4The signal exported after the positive one way link of proximal fiber to distal end is A5；(t- τ) is prolonged again there are one the time after the 3rd one way fiber link is transmitted Slow τ, above formula arrangement can obtain：Step 7)：Signal A5It can be obtained after half divides and local oscillated signal A0With frequency with the signal A of phase6：So far, the phase error for completing fiber link eliminates.
- 2. a kind of method that can eliminate phase error in fiber link according to claim 1, it is characterised in that：Step 6) the signal A4Enter by the first photo-coupler after electrooptic modulator is modulated and be sent to fiber distal end, by putting Greatly, detect, obtain signal A after filtering5。
- 3. usage right requires the device of 1 or 2 the methods, it is characterised in that：Including local oscillator, positive one way link and Reversed one way link, local oscillator are connected to the first photo-coupler of positive one way link, and local oscillator is also connected to three The output terminal of the input terminal of frequency multiplier, output terminal and reversed one way link is connected respectively to the input terminal of frequency mixer, frequency mixer Output terminal be connected to the input terminal of the first photo-coupler, the output terminal connection of the 3rd photo-coupler of positive one way link To the second photodetector, the second photodetector output terminal is connected to the second bandpass filter, the output of the second bandpass filter End is connected to 1/2 frequency divider.
- 4. device according to claim 3, it is characterised in that：Positive one way link includes laser, electrooptic modulator, the Two photo-couplers, near-end optical circulator, fiber link, distal end optical circulator, distal end erbium-doped fiber amplifier, the 3rd optical coupling Device, the first photodetector, the first bandpass filter, and be sequentially connected, the output terminal of local oscillator connects the first optical coupling Device, the output terminal of the first photo-coupler are connected to electrooptic modulator, the output terminal connection biasing control of the second photo-coupler Device, the output terminal of offset controller are connected to electrooptic modulator.
- 5. device according to claim 3, it is characterised in that：Reversed one way link includes distal end optical circulator, optical fiber chain Road, near-end optical circulator, near-end erbium-doped fiber amplifier, near-end photodetector, near-end bandpass filter, and be sequentially connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711435846.8A CN108092721A (en) | 2017-12-26 | 2017-12-26 | A kind of algorithm and device that can eliminate phase error in fiber link |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711435846.8A CN108092721A (en) | 2017-12-26 | 2017-12-26 | A kind of algorithm and device that can eliminate phase error in fiber link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111147150A (en) * | 2019-12-18 | 2020-05-12 | 上海交通大学 | Passive phase compensation-based distributed optical frequency transmission device and transmission method |
| CN111355485A (en) * | 2019-09-29 | 2020-06-30 | 西安空间无线电技术研究所 | System and method for eliminating phase drift of delay line |
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| CN103490816A (en) * | 2013-09-24 | 2014-01-01 | 清华大学 | System and method for passive transmission of microwave frequency signals |
| CN104168064A (en) * | 2014-08-27 | 2014-11-26 | 中国科学院半导体研究所 | Microwave signal optical fiber stationary-phase transmission device based on back and forth phase correction |
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| US20120263465A1 (en) * | 2011-04-18 | 2012-10-18 | Hitoshi Kiuchi | Optical transmission system and optical transmission method |
| CN103490816A (en) * | 2013-09-24 | 2014-01-01 | 清华大学 | System and method for passive transmission of microwave frequency signals |
| CN104168064A (en) * | 2014-08-27 | 2014-11-26 | 中国科学院半导体研究所 | Microwave signal optical fiber stationary-phase transmission device based on back and forth phase correction |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111355485A (en) * | 2019-09-29 | 2020-06-30 | 西安空间无线电技术研究所 | System and method for eliminating phase drift of delay line |
| CN111355485B (en) * | 2019-09-29 | 2023-03-28 | 西安空间无线电技术研究所 | System and method for eliminating phase drift of delay line |
| CN111147150A (en) * | 2019-12-18 | 2020-05-12 | 上海交通大学 | Passive phase compensation-based distributed optical frequency transmission device and transmission method |
| CN111147150B (en) * | 2019-12-18 | 2023-02-07 | 上海交通大学 | Distributed optical frequency transmission device and transmission method based on passive phase compensation |
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