CN109104247A - The steady phase Transmission system of broadband signal based on microwave photon link - Google Patents
The steady phase Transmission system of broadband signal based on microwave photon link Download PDFInfo
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- CN109104247A CN109104247A CN201811083621.5A CN201811083621A CN109104247A CN 109104247 A CN109104247 A CN 109104247A CN 201811083621 A CN201811083621 A CN 201811083621A CN 109104247 A CN109104247 A CN 109104247A
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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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- 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
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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Abstract
It includes transmitting terminal, receiving end and long optical fibers that the present invention, which discloses a kind of steady phase Transmission system of the broadband signal based on microwave photon link,；The transmitting terminal is connected with the receiving end by the long optical fibers；The receiving end includes the second fiber coupler, acousto-optic frequency shifters module, faraday rotation mirror, the second optical fiber circulator module, chirp grating, high frequency photodetector, and the receiving end includes the second fiber coupler, acousto-optic frequency shifters module, faraday rotation mirror, the second optical fiber circulator module, chirp grating, high frequency photodetector；The present invention carries out shift frequency processing to optical signal, modulation light is returned to avoid transmitted signal is interfered using faraday's rotating mirror, interfered by area of light and is demodulated the phase fluctuation in optical fiber to carry out feedback control processing, cause the present invention that there is high steady phase precision, and avoids pilot signal interference problem；The present invention uses the collocation structure of chirp grating simultaneously, avoids bring phase problem out of control of drifting about due to optical source wavelength.
Description
Technical field
The present invention relates to the Microwave photonics fields of radiofrequency signal optical fiber transmission, and in particular to one kind is based on microwave light subchain
The steady phase Transmission system of the broadband signal on road.
Background technique
The steady phase transmission technology of broadband rf signal is in radio astronomy detection, radar radio technology, electronic information pair
Anti- equal fields are widely used.Current numerous areas is to the bandwidth of transmitting radio frequency signal, phase stabilization precision, spurious reduction
Etc. indexs propose increasingly higher demands, but traditional radiofrequency signal generallys use radio-frequency cable and is transmitted, and system is logical
It is often huger, and total quality weight, signal transmission attenuation is big, bandwidth is limited, at high cost etc..
It is transmitted relative to radio-frequency cable, optical fiber is with light-weight, electromagnetism interference is good, loss is extremely low, bandwidth is very big, valence
The advantages that lattice are cheap；Thus signal transmission is carried out using optical fiber to be especially suitable for carrying out the long distance transmission neck of radiofrequency signal
Domain achieves extensive development in recent years.But since optical fiber is optical waveguide, it is easy by local environment factor such as temperature
Degree, vibration, the influence of pressure, so that the light path of its interior lights changes, and then affects the phase of transmitted signal, especially
It is the transmission for carrying out long range radiofrequency signal.
Current radiofrequency signal optical fiber transmission plan is typically only capable to the signal of transmission finite bandwidth, for higher frequency signal
Transmission would generally bring biggish phase error, and existing stabilized fiber phase transmission technology would generally introduce in the signal transmitted
The pilot signal of one low frequency is calculated the fluctuation of the light path in corresponding optical fiber transmission by the pilot signal, then led to
Cross the variation that feedback control technology carrys out light path caused by the external interference that compensated optical fiber is subject to.But by being transmitted
It joined low-frequency pilot signal in signal, usually also have corresponding pilot signal in receiving end and received together, caused
Signal transmission quality is poor in some cases, and signal especially transmitted itself includes low frequency signal components.And pilot tone is believed
Number phase stabilization control precision is directly proportional to pilot carrier frequency, simultaneously because pilot signal interference transmission signal is avoided, so leading
The frequency of frequency signal is generally all very low, to limit phase controlling precision.
Summary of the invention
To solve above-mentioned technological deficiency, the technical solution adopted by the present invention is, provides a kind of based on microwave photon link
The steady phase Transmission system of broadband signal include transmitting terminal, receiving end and long optical fibers；The transmitting terminal and the receiving end pass through institute
Long optical fibers are stated to be connected；The receiving end includes the second fiber coupler, acousto-optic frequency shifters module, faraday rotation mirror, the second light
Fine circulator module, chirp grating, high frequency photodetector, the receiving end include the second fiber coupler, acousto-optic frequency shifters
Module, faraday rotation mirror, the second optical fiber circulator module, chirp grating, high frequency photodetector；The laser module
Light output end is connected with the port A of first fiber coupler, the port B of first fiber coupler and the photoelectricity
The light input end of modulation module is connected, the port J of the C port of first fiber coupler and the third fiber coupler
It is connected, the output end of the electro-optical modulation module is connected with the port D of the first optical fiber circulator module；First light
The port E of fine circulator module is successively connected in series with the quick adjustment module, the adjustment module at a slow speed, the long optical fibers,
The long optical fibers are connected with the port G of second fiber coupler, the port H of second fiber coupler and described second
The M port of optical fiber circulator module is connected, the both ends of the acousto-optic frequency shifters respectively with faraday's rotating mirror and described second
The port I of fiber coupler is connected；The N-port connection chirp grating of the second optical fiber circulator module, described second
The O port of optical fiber circulator module connects the high frequency photodetector；The port J of the third fiber coupler and described the
The C port of one fiber coupler is connected, the port K of the third fiber coupler and the first optical fiber circulator module
The port F is connected, and the port L of the third fiber coupler is connected with the input terminal of the low frequency photodetector, described
The output signal of low frequency photodetector accesses the signal demodulation process and feedback control module, the signal demodulation process and
The output end of feedback control module accesses the quick adjustment module and the electrical input of the adjustment module at a slow speed is fed back
Control.
Preferably, the chirp grating is the fiber grating of linear chrip rate, width is transmitted in the long optical fibers for correcting
The group delay of band signal.
Preferably, the calculating formula of the chirp grating chirp rate ∧ is；
Wherein, δ is the abbe number that the long optical fibers are located at the laser module central wavelength, and L is required steady phase
The fiber lengths of control, c are the light velocity in vacuum, and n is optical fibre refractivity.
Preferably, the first optical fiber circulator module is exported from the light that the port D inputs from the port E, from institute
The light for stating the input of the port E is exported from the port F；The second optical fiber circulator module is from the light that the M port inputs from institute
N-port output is stated, the light inputted from the N-port is exported from the O port.
Preferably, the laser module is set as narrow linewidth laser, for be described based on microwave photon link
The steady phase Transmission system of broadband rf signal provides light carrier.
Preferably, the electro-optical modulation module, which is set as Mach, increases Dare type phase-modulator.
Preferably, the high frequency photodetector be radiofrequency signal photodetector, for by radiofrequency signal from area of light also
Original arrives electrical domain.
Preferably, the acousto-optic that the cutoff frequency of the low frequency photodetector is higher than twice of acousto-optic frequency shifters module moves
Frequent rate, for will include that the signal of optical fiber link phase fluctuation information is changed into accessible electric signal.
Preferably, the adjustment module at a slow speed uses fiber stretcher.
Preferably, the quick adjustment module uses the air cell structure of Piezoelectric Ceramic.
Compared with the prior art the beneficial effects of the present invention are: 1, the present invention to optical signal carry out shift frequency processing, utilize
Faraday's rotating mirror returns to modulation light to interfere transmitted signal, using the method interfered in area of light by the phase in optical fiber
Position Wave Solutions, which recall, carries out feedback control processing, and the present invention is caused to have high steady phase precision, and avoids pilot signal dry
Disturb problem；2, by using quick adjustment module and at a slow speed, adjustment module two parts carry out phase fluctuation high speed to the present invention respectively
By a small margin with low speed significantly phase compensation, the depth of feedback of the steady phase Transmission system of broadband signal can be expanded, improve broadband letter
The response speed and environmental suitability of number steady phase Transmission system；3, the present invention corrects broadband signal by using chirp grating
Chromatic dispersion problem avoids the faint drift of laser wavelength that from bringing great phase hit in long distance transmission；It uses simultaneously
Chirp grating reduces the wavelength stability requirement of light source, further increases the steady phase precision of the steady phase Transmission system of broadband signal, drop
The requirement and system cost of low optical source wavelength stability.
Detailed description of the invention
Fig. 1 is the circuit diagram of the steady phase Transmission system of the broadband rf signal of the present invention based on microwave photon link.
Digital representation in figure:
1- laser module；The first fiber coupler of 2-；3- electro-optical modulation module；4- the first optical fiber circulator module；5-
Quick adjustment module；6- adjustment module at a slow speed；7- long optical fibers；The second fiber coupler of 8-；9- acousto-optic frequency shifters module；10- method
Draw revolving mirror；11- the second optical fiber circulator module；12- chirp grating；13- high frequency photodetector；14- third optical fiber coupling
Clutch；15- low frequency photodetector；16- signal demodulation process and feedback control module.
Specific embodiment
Below in conjunction with attached drawing, the forgoing and additional technical features and advantages are described in more detail.
As shown in FIG. 1, FIG. 1 is the steady phase Transmission systems of the broadband rf signal of the present invention based on microwave photon link
Circuit diagram；The steady phase Transmission system of broadband rf signal of the present invention based on microwave photon link includes transmitting terminal, receiving end
With long optical fibers 7；The transmitting terminal is connected with the receiving end by the long optical fibers 7.
The transmitting terminal includes laser module 1, the first fiber coupler 2, electro-optical modulation module 3, the first fiber annular
Device module 4, quick adjustment module 5, at a slow speed adjustment module 6, third fiber coupler 14, low frequency photodetector 15, signal solution
Mediate reason and feedback control module 16；The receiving end includes the second fiber coupler 8, acousto-optic frequency shifters module 9, faraday's rotation
Tilting mirror 10, the second optical fiber circulator module 11, chirp grating 12, high frequency photodetector 13.
Specifically, the light output end of the laser module 1 is connected with the port A of first fiber coupler 2, institute
The port B for stating the first fiber coupler 2 is connected with the light input end of the electro-optical modulation module 3, first fiber coupling
The C port of device 2 is connected with the port J of the third fiber coupler 14, the output end of the electro-optical modulation module 3 and described the
The port D of one optical fiber circulator module 4 is connected.The port E of the first optical fiber circulator module 4 successively with the fast velocity modulation
Section module 5, the adjustment module at a slow speed 6, the long optical fibers 7 are connected in series, and the long optical fibers 7 connect second fiber coupler 8
The port G, the port H of second fiber coupler 8 is connected with the M port of the second optical fiber circulator module 11, described
The both ends of acousto-optic frequency shifters 9 are connected with the port I of faraday's rotating mirror 10 and second fiber coupler 8 respectively.It is described
The O port of second optical fiber circulator module 11 connects the high frequency photodetector 13, and N-port connects the chirp grating 12.It is described
The port J of third fiber coupler 14 is connected with the C port of first fiber coupler 2, the third fiber coupler
14 port K is connected with the port F of the first optical fiber circulator module 4, the port L of the third fiber coupler 14 with
The input terminal of the low frequency photodetector 15 is connected, and the output signal of the low frequency photodetector 15 accesses the signal
The output end access of demodulation process and feedback control module 16, the signal demodulation process and feedback control module 16 is described quickly
The electrical input of adjustment module 5 and the adjustment module at a slow speed 6 carries out feedback control.
The laser module 1 is set as narrow linewidth laser, for penetrating for the broadband based on microwave photon link
The steady phase Transmission system of frequency signal provides light carrier.
The electro-optical modulation module 3 is preferably arranged to Mach and increases Dare type phase-modulator.
The adjustment module at a slow speed 6 is to provide the module that optical fiber disturbance is adjusted at a slow speed, can be corrected in optical fiber significantly
Low frequency phase fluctuation, the adjustment module at a slow speed 5 preferably use fiber stretcher.
The quick adjustment module 5 is to provide the module of fast fibre disturbance adjusting, has lesser inertia, can correct
The high-frequency phase of optical fiber small amplitude fluctuates, the quick adjustment module 6 can be used by optical fiber be pasted onto piezoelectric ceramics on piece or
The structures such as the air chamber using Piezoelectric Ceramic.
The port the D input light of the first optical fiber circulator module 4 can be exported from the port E, and the port E input light can be from the end F
Mouth output.
The M port input light of the second optical fiber circulator module 11 can be exported from N-port, and N-port input light can be from the end O
Mouth output.
Optical signal is carried out shift frequency by the acousto-optic frequency shifters module 9, is used to form beat signal to carry out phase signal
Demodulation.
The chirp grating 12 is the fiber grating of linear chrip rate, the chirp rate ∧ and the long optical fibers length and institute
It states long optical fibers abbe number to match, the group delay for transmitting broadband signal in the long optical fibers 7 can be corrected.
Preferably, the calculating formula of the 12 chirp rate Λ of chirp grating is；
Wherein, δ is the abbe number that the long optical fibers are located at the laser module central wavelength, and L is required steady phase
The fiber lengths of control, c are the light velocity in vacuum, and n is optical fibre refractivity.
Required steady facies-controlled fiber lengths are generally the length dimension of the long optical fibers 7；The optical fibre refractivity n is institute
State the optical fibre refractivity of long optical fibers 7.
The chirp grating 12 can be realized to optical source wavelength drift and fibre-optical dispersion using the calculating formula of the chirp rate ∧
Lead to the accurate compensation of phase change.Due to the signal demodulation process and feedback control module 16, the quick adjustment module 5
It is stable phase place value with 6 major function of adjustment module at a slow speed, fluctuates the phase value not, passes through the chirp grating 12
Phase change caused by correcting laser wavelength change reduces link light phase caused by optical source wavelength variation and changes, to protect
Link light phase is demonstrate,proved to change in the signal demodulation process and the phase demodulation range of feedback control module 16, it is described based on micro- to realize
The normal work of the steady phase Transmission system of the broadband signal of glistening light of waves sublink.
The high frequency photodetector 13 is radiofrequency signal photodetector, for radiofrequency signal to be reverted to electricity from area of light
Domain.
The low frequency photodetector 15 is low frequency photodetector, and cutoff frequency is higher than twice of acousto-optic frequency translation frequency,
For will include that the signal of optical fiber link phase fluctuation information is changed into accessible electric signal.
The signal processing and feedback control module 16 complete the demodulation of real-time phase information and the production of feedback control signal
It is raw.
Signal processing unit in the signal processing and feedback control module 16 preferably use FPGA circuitry, DSP circuit,
One or more of dedicated ASIC circuit, the signal processing unit complete the processing of live signal with by the live signal
In phase signal demodulate come, and by the phase signal low-frequency excitation and high frequency components by filtering separate,
The corresponding feedback control algorithm of application generates feedback control signal respectively, and is given respectively by D/A conversion output described quick
Adjustment module 5 and adjustment module 6 at a slow speed.
The steady specific course of work of phase Transmission system of broadband signal of the present invention based on microwave photon link are as follows: described
The light that laser module 1 issues is divided into first light and second light by first fiber coupler 2, and described first
Zhi Guang enters the electro-optical modulation module 3 and forms modulation light and defeated by rf-signal modulation in the electro-optical modulation module 3
Out；Second light enters an input terminal of the third fiber coupler 14, the institute that the electro-optical modulation module 3 exports
Modulation light is stated into the first optical fiber circulator module 4；The output light of the first optical fiber circulator module 4 sequentially enters institute
It states and enters second fiber coupler 8 after quick adjustment module 5, the adjustment module at a slow speed 6, the long optical fibers 7, described the
The output light of two fiber couplers 8 is divided into third Zhi Guang and the 4th light；The third Zhi Guang enters second fiber annular
Device module 11, penetrating on light will be modulated at by entering the high frequency photodetector 13 after then reflecting by the chirp grating 12
Frequency signals revivification comes out；4th light enters the acousto-optic frequency shifters module 9, then using faraday's rotating mirror 10
Pass through the acousto-optic frequency translation module 9 after reflection again, return to second fiber coupler 8, then passes sequentially through and described adjust at a slow speed
Module 6, the quick adjustment module 5, the first optical fiber circulator module 4, subsequently into the third fiber coupler 14,
Interfere output in the third fiber coupler 14 with second light, it is described into the low frequency photodetector 15
The low-frequency acquisition device 15 is exported the high speed fibre phase for including in electric signal by signal demodulation process and feedback control module 16
Fluctuation information, which demodulates, carrys out and feeds back to the progress of quick adjustment module 5 feedback control, will export the light for including in electric signal
Fine low speed phase fluctuation information, which demodulates, carrys out and feeds back to the progress of adjustment module 6 feedback control at a slow speed, is based on described in final realization
Precise and stable transmission of the steady phase Transmission system of the broadband signal of microwave photon link to radiofrequency signal.
The foregoing is merely presently preferred embodiments of the present invention, is merely illustrative for the purpose of the present invention, and not restrictive
's.Those skilled in the art understand that in the spirit and scope defined by the claims in the present invention many changes can be carried out to it,
It modifies or even equivalent, but falls in protection scope of the present invention.
Claims (10)
1. a kind of steady phase Transmission system of broadband signal based on microwave photon link, which is characterized in that including transmitting terminal, receiving end
And long optical fibers；The transmitting terminal is connected with the receiving end by the long optical fibers；The receiving end includes the second fiber coupling
Device, acousto-optic frequency shifters module, faraday rotation mirror, the second optical fiber circulator module, chirp grating, high frequency photodetector, institute
Stating receiving end includes the second fiber coupler, acousto-optic frequency shifters module, faraday rotation mirror, the second optical fiber circulator module, Zhou
It sings grating, high frequency photodetector；The light output end of the laser module is connected with the port A of first fiber coupler
It connects, the port B of first fiber coupler is connected with the light input end of the electro-optical modulation module, the first optical fiber coupling
The C port of clutch is connected with the port J of the third fiber coupler, the output end of the electro-optical modulation module and described first
The port D of optical fiber circulator module is connected；The port E of the first optical fiber circulator module successively with the quick adjusting mould
Block, the adjustment module at a slow speed, the long optical fibers are connected in series, and the port G of the long optical fibers and second fiber coupler connects
It connects, the port H of second fiber coupler is connected with the M port of the second optical fiber circulator module, the acousto-optic frequency translation
The both ends of device are connected with the port I of faraday's rotating mirror and second fiber coupler respectively；Second fiber annular
The N-port of device module connects the chirp grating, and 0 port of the second optical fiber circulator module connects the high frequency light electrical resistivity survey
Survey device；The port K of the third fiber coupler is connected with the port F of the first optical fiber circulator module, the third
The port L of fiber coupler is connected with the input terminal of the low frequency photodetector, the output of the low frequency photodetector
Signal accesses the signal demodulation process and feedback control module, the output end of the signal demodulation process and feedback control module
The electrical input for accessing the quick adjustment module and the adjustment module at a slow speed carries out feedback control.
2. the steady phase Transmission system of broadband signal as described in claim 1 based on microwave photon link, which is characterized in that described
Chirp grating is the fiber grating of linear chrip rate, for correcting the group delay for transmitting broadband signal in the long optical fibers.
3. the steady phase Transmission system of broadband signal as claimed in claim 2 based on microwave photon link, which is characterized in that described
The calculating formula of chirp grating chirp rate Λ is；
Wherein, δ is the abbe number that the long optical fibers are located at the laser module central wavelength, and L is required steady phase control
Fiber lengths, c be vacuum in the light velocity, n is optical fibre refractivity.
4. the steady phase Transmission system of broadband signal as described in claim 1 based on microwave photon link, which is characterized in that described
First optical fiber circulator module is exported from the light that the port D inputs from the port E, and the light inputted from the port E is from institute
State the output of the port F；The second optical fiber circulator module is exported from the light that the M port inputs from the N-port, from the N
The light of port input is exported from 0 port.
5. the steady phase Transmission system of broadband signal as described in claim 1 based on microwave photon link, which is characterized in that described
Laser module is set as narrow linewidth laser, for surely mutually transmitting for the broadband rf signal based on microwave photon link
System provides light carrier.
6. the steady phase Transmission system of broadband signal as described in claim 1 based on microwave photon link, which is characterized in that described
Electro-optical modulation module is set as Mach and increases Dare type phase-modulator.
7. the steady phase Transmission system of broadband signal as described in claim 1 based on microwave photon link, which is characterized in that described
High frequency photodetector is radiofrequency signal photodetector, for radiofrequency signal to be reverted to electrical domain from area of light.
8. the steady phase Transmission system of broadband signal as described in claim 1 based on microwave photon link, which is characterized in that described
The cutoff frequency of low frequency photodetector is higher than the acousto-optic frequency translation frequency of twice of acousto-optic frequency shifters module, for that will include light
The signal of fine link phase fluctuation information is changed into accessible electric signal.
9. the steady phase Transmission system of broadband signal as described in claim 1 based on microwave photon link, which is characterized in that described
Adjustment module uses fiber stretcher at a slow speed.
10. the steady phase Transmission system of broadband signal as described in claim 1 based on microwave photon link, which is characterized in that institute
State the air cell structure that quick adjustment module uses Piezoelectric Ceramic.
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| CN113259007B (en) * | 2021-06-24 | 2022-05-17 | 上海交通大学 | Cascaded optical frequency transfer device and method |
| CN114460043A (en) * | 2021-12-20 | 2022-05-10 | 哈尔滨理工大学 | High-speed stable optical fiber refractive index sensing system and method based on photon time stretching |
| CN114460043B (en) * | 2021-12-20 | 2024-01-26 | 哈尔滨理工大学 | High-speed stable optical fiber refractive index sensing system and method based on photon time stretching |
| CN115102619A (en) * | 2022-07-18 | 2022-09-23 | 中国电子科技集团公司第四十三研究所 | Radio frequency signal self-adaptive optical fiber phase-stable transmission device and method |
| CN116155391A (en) * | 2022-12-01 | 2023-05-23 | 中国电子科技集团公司第三十八研究所 | Bandwidth and center frequency adjustable microwave photon filtering system |
| CN116155391B (en) * | 2022-12-01 | 2024-04-09 | 中国电子科技集团公司第三十八研究所 | Bandwidth and center frequency adjustable microwave photon filtering system |
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