CN103701529A - Signal time delay stable transmission method and system of broadband - Google Patents
Signal time delay stable transmission method and system of broadband Download PDFInfo
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- CN103701529A CN103701529A CN201310662454.0A CN201310662454A CN103701529A CN 103701529 A CN103701529 A CN 103701529A CN 201310662454 A CN201310662454 A CN 201310662454A CN 103701529 A CN103701529 A CN 103701529A
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Abstract
The invention provides a signal time delay stable transmission method and system of broadband. The method comprises the steps of producing stable frequency standard signals in a center station, producing light carrier through a tunable laser, modulating the frequency standard signals onto the light carrier, so as to form initial light signals, transmitting the light signals to a remote terminal through an optical fiber, transmitting the light signals of the remote terminal back to the identical optical fiber to the center station, demodulating the light signals which are transmitted back, comparing return radio-frequency signals and the frequency standard signals, so as to obtain a phase difference, controlling the tunable laser to change the length of the light carrier according to the phase difference, so as to obtain compensation light carrier and ensure that the sum of a chromatic dispersion time delay inequality and a link time delay variation is zero, inputting broadband radio-frequency signals from the remote terminal, modulating the broadband radio-frequency signals input by the remote terminal onto the light signals of the remote terminal, so as to form remote modulating light signals, transmitting the remote modulating light signals back, demodulating the remote modulating light signals received by the center station into stable remote terminal radio-frequency signals, and outputting the stable remote terminal radio-frequency signals. According to the invention, additional compensation devices are not needed to be arranged, and the system has a simple structure and high practicability.
Description
Technical field
The present invention relates to field of signal transmissions, relate in particular to a kind of signal time delay stable transfer method and system of broadband.
Background technology
In order to improve the precision of the systems such as space electromagnetic spectrum detection, space travel control, radar, observing and controlling, detection system from single antenna to many antennas, single base is to many base developments.In order further to improve detection accuracy, multiaerial system of future generation is inevitable to be developed towards coherent measurement.The coherent measurement, the signal coherence that realize between many antennas are synthetic, must guarantee to realize the frequency distribution of high-precision time synchronized and high stability between each antenna.In multiaerial system, the distance between each antenna element is generally several kilometers even tens kilometers, and the time frequency signal high accuracy that realize long distance like this distributes and must adopt advanced optical fiber transmission technique.Steady phase transmission technology based on optical fiber is spaceflight TT&C system of future generation, particularly in the system such as the space flight measurement and control such as very long baseline interferometry(VLBI (VLBI) and line interferometry (CEI) and navigation, survey of deep space, many bases coherent radar, electronic warfare, indispensable foundation stone.
Fig. 1 is the typical steady phase Transmission Fibers of microwave frequency link structure in prior art, and this scheme is the most directly to transmit the mode of microwave frequency reference.Radio frequency reference signal is directly modulated on light carrier and is transmitted by intensity modulator, through Optical Fiber Transmission, arrive far-end antenna place, light signal reflects at distal portions, through optical fiber, again transmit and get back to central station, compare with original radio frequency reference signal, obtain the phase noise signal that optical fiber link is introduced, with this signal controlling piezoelectric ceramic (PZT) or temperature control light volume, after Active Compensation phase jitter, realize the stable phase angle transmission of frequency reference.Use this scheme far-end directly with detector, to obtain required radio frequency reference signal.
But, prior art must realize by adding extra compensating device the delay compensation of optical fiber link, to reach the stable transfer of frequency signal, sometimes even needs the common co-ordination of multiple compensating device, complex structure, is unfavorable for frequency stabilization adjusting and signal transmission in practical application.
Summary of the invention
(1) technical problem that will solve
The invention provides a kind of signal time delay stable transfer method and system of broadband, to solve, in prior art, need to add learning rate part and realize the compensation of optical fiber link delay variation, the technical problem of system configuration complexity.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of signal time delay stable transfer method of broadband, comprising:
At central station, produce stable frequency standard signal;
Utilize tunable laser to produce light carrier;
Described frequency standard signal is modulated on described light carrier, forms initial optical signal;
Described initial optical signal is transmitted through the fiber to far-end;
Import far-end optical return signal into same optical fiber to central station;
The demodulation of passback light signal is obtained returning radiofrequency signal;
The phase difference of more described passback radiofrequency signal and described frequency standard signal;
According to described phase difference, control tunable laser and change optical carrier wavelength, be compensated light carrier, make compensating light carrier wave after Optical Fiber Transmission with the dispersion delay inequality of initial light carrier, the chain-circuit time delay shake causing with described phase difference adds up to zero;
From far-end input broadband rf signal;
The broadband rf signal of far-end input is modulated on described far-end light signal, becomes far-end modulated light signal, and passback;
The far-end modulated light signal that central station is received is demodulated into stablizes far end radio frequency signal output.
Further, described in make compensating light carrier wave after Optical Fiber Transmission with the dispersion delay inequality of initial light carrier, the chain-circuit time delay shake causing with described phase difference adds up to zero and comprises:
The centre frequency that makes described frequency standard signal is ω, and initial phase is
initial optical carrier wavelength is λ, and optical fiber link is because the chain-circuit time delay of variations in temperature and vibration introducing is dithered as Δ τ
path, the phase place of passback radiofrequency signal is
obtaining phase difference is
Controlling tunable laser change optical maser wavelength is λ+Δ λ, and it is met
wherein, D is the abbe number of monomode fiber, the length that L is optical fiber.
Further,
Described, import far-end optical return signal into same optical fiber to central station, described the demodulation of passback light signal is obtained to return radiofrequency signal before, also comprise: to passback light signal carry out signal amplification;
And/or, after described passback, and the described far-end modulated light signal that central station is received be demodulated into stablize far end radio frequency signal and output before, also comprise: the far-end modulated light signal receiving is carried out to signal amplification.
Further,
Described the demodulation of passback light signal is obtained to return radiofrequency signal after, before the phase difference of described passback radiofrequency signal and described frequency standard signal, also comprise: described passback radiofrequency signal is carried out to radio frequency amplification and filtering;
And/or, after the described far-end modulated light signal that central station is received is demodulated into and stablizes far end radio frequency signal, before output, also comprise: described stable far end radio frequency signal is carried out to radio frequency amplification and filtering.
On the other hand, the present invention also provides a kind of signal time delay stable transfer system of broadband, comprise: rf frequency standard source, tunable laser, central station electrooptic modulator, optical fiber, upstream device, central station photodetector, phase discriminator, compensation control unit, far end radio frequency signal source and far-end electrooptic modulator, wherein:
Rf frequency standard source, is connected with phase discriminator with central station electrooptic modulator respectively, for produce stable frequency standard signal at central station;
Tunable laser, is connected with compensation control unit with central station electrooptic modulator respectively, for generation of light carrier;
Central station electrooptic modulator, is also connected with optical fiber, for described frequency standard signal is modulated to described light carrier, forms initial optical signal;
Optical fiber, is also connected with upstream device, far-end electrooptic modulator and central station photodetector respectively, for described initial optical signal is transferred to far-end;
Upstream device, for importing far-end optical return signal into same optical fiber to central station; Far-end modulated light signal is returned;
Central station photodetector, is also connected with phase discriminator, for the demodulation of passback light signal is obtained returning radiofrequency signal; The far-end modulated light signal that central station is received is demodulated into stablizes far end radio frequency signal output;
Phase discriminator, for the phase difference of more described passback radiofrequency signal and described frequency standard signal;
Compensation control unit, be connected with tunable laser with phase discriminator, for controlling tunable laser according to described phase difference, change optical carrier wavelength, be compensated light carrier, make compensating light carrier wave after Optical Fiber Transmission with the dispersion delay inequality of initial light carrier, the chain-circuit time delay shake causing with described phase difference adds up to zero;
Far end radio frequency signal source, for inputting broadband rf signal from far-end;
Far-end electrooptic modulator, is modulated to the broadband rf signal of far-end input on far-end light signal, becomes far-end modulated light signal.
Further, described compensation control unit comprises:
Phase difference calculating subelement, for calculating the phase difference of described passback radiofrequency signal and described frequency standard signal:
The centre frequency that makes described frequency standard signal is ω, and initial phase is
initial optical carrier wavelength is λ, and optical fiber link is because the delay variation of variations in temperature and vibration introducing is Δ τ
path, the phase place of passback radiofrequency signal is
for calculating the formula of phase difference, be
Wavelength shift subelement, is λ+Δ λ for controlling tunable laser change optical carrier wavelength, and it is met
wherein, D is the abbe number of monomode fiber, the length that L is optical fiber.
Further,
Described upstream device is: faraday rotation mirror, and/or, far-end optical circulator.
Further, described system also comprises:
Central station optical circulator, is connected clockwise with central station electrooptic modulator, optical fiber and central station photodetector respectively, for the sequential delivery of control centre's station light signal.
Further, described system also comprises:
Central station erbium-doped fiber amplifier, is connected between optical fiber and central station photodetector, for passback light signal and far-end modulated light signal are carried out to signal amplification.
Further, described system also comprises:
Passback radio frequency amplifier, is connected with central station photodetector, for described passback radiofrequency signal is carried out to radio frequency amplification; Passback filter, is connected between passback radio frequency amplifier and phase discriminator, for the passback radiofrequency signal after radio frequency is amplified, carries out filtering;
And/or output radio frequency amplifier, is connected with central station photodetector, for described stable far end radio frequency signal is carried out to radio frequency amplification; Output filter, is connected between output radio frequency amplifier and output, for the stable far end radio frequency signal after radio frequency is amplified, carries out filtering.
(3) beneficial effect
Visible, in the signal time delay stable transfer method and system in the broadband proposing in the present invention, by relatively coming and going the passback radiofrequency signal of transmission and the phase difference of rf frequency standard signal, draw the delay variation of optical fiber link, then utilize tunable laser to change optical maser wavelength, while transmitting in optical fiber by different wave length, produce different dispersion time delays and compensate this shake, finally realize the central station that passes back to of far-end broadband rf signal frequency and phase stabilization is exported.The present invention utilizes optical fiber simultaneously as transmission medium and compensating device, without adding extra compensating device, realizes phase/frequency jitter compensation process, and system configuration is simple, practical.
In addition, the present invention obtains different dispersion time delays by change optical maser wavelength and shakes with compensated fiber link, and compensation range is larger, and because dispersion time delay is directly proportional to the length of optical fiber, optical fiber is longer, and the scope of compensation is also larger; Meanwhile, the present invention can guarantee that the overall delay of optical fiber link keeps constant, can be in link modulation different frequency rf frequency standard signal and transmit, being with of relays link is roomy, and is applicable to the transmission of time signal.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the steady phase Transmission Fibers of microwave frequency link structure schematic diagram;
Fig. 2 is the basic procedure schematic diagram of the signal time delay stable transfer method in embodiment of the present invention broadband;
Fig. 3 is the basic structure schematic diagram of the signal time delay stable transfer system in embodiment of the present invention broadband;
Fig. 4 is a preferred embodiment structural representation of the signal time delay stable transfer system in embodiment of the present invention broadband;
Fig. 5 is a preferred embodiment schematic flow sheet of the signal time delay stable transfer method in embodiment of the present invention broadband;
Fig. 6 is a preferred embodiment structural representation of the signal time delay stable transfer system in embodiment of the present invention broadband.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
First the embodiment of the present invention proposes a kind of signal time delay stable transfer method of broadband, referring to Fig. 2, comprising:
Step 201: produce stable frequency standard signal at central station.
Step 202: utilize tunable laser to produce light carrier.
Step 203: described frequency standard signal is modulated on described light carrier, forms initial optical signal.
Step 204: described initial optical signal is transmitted through the fiber to far-end.
Step 205: import far-end optical return signal into same optical fiber to central station.
Step 206: the demodulation of passback light signal is obtained returning radiofrequency signal.
Step 207: the phase difference of more described passback radiofrequency signal and described frequency standard signal.
Step 208: according to described phase difference, control tunable laser and change optical carrier wavelength, be compensated light carrier, make compensating light carrier wave after Optical Fiber Transmission with the dispersion delay inequality of initial light carrier, the chain-circuit time delay shake causing with described phase difference adds up to zero.
Step 209: from far-end input broadband rf signal.
Step 210: the broadband rf signal of far-end input is modulated on far-end light signal, becomes far-end modulated light signal, and passback.
Step 211: the far-end modulated light signal that central station is received is demodulated into stablizes far end radio frequency signal output.
Visible, in the signal time delay stable transfer method in the broadband proposing in the embodiment of the present invention, by relatively coming and going the passback radiofrequency signal of transmission and the phase difference of rf frequency standard signal, draw the delay variation of optical fiber link, then utilize tunable laser to change optical maser wavelength, while transmitting in optical fiber by different wave length, produce different dispersion time delays and compensate this shake, finally realize the central station that passes back to of far-end broadband rf signal frequency and phase stabilization is exported.The present invention utilizes optical fiber simultaneously as transmission medium and compensating device, without adding extra compensating device, realizes phase/frequency jitter compensation process, and system configuration is simple, practical.
In addition, the present invention obtains different dispersion time delays by change optical maser wavelength and shakes with compensated fiber link, and compensation range is larger, and because dispersion time delay is directly proportional to the length of optical fiber, optical fiber is longer, and the scope of compensation is also larger; Meanwhile, the present invention can guarantee that the overall delay of optical fiber link keeps constant, can be in link modulation different frequency rf frequency standard signal and transmit, being with of relays link is roomy, and is applicable to the transmission of time signal.
In one embodiment of the invention, make rf frequency standard source produce a stable single-frequency point frequency standard signal, its centre frequency is ω, initial phase is
single-frequency point frequency standard signal is modulated on light carrier, and carrier wavelength lambda, is delivered to far-end by optical fiber transmission, in the part of the light signal of far-end, is reflected and enters same optical fiber and pass central station back.
If optical fiber link is because the delay variation of variations in temperature and vibration introducing is Δ τ
path; Turn back to the light signal of central station through photodetector demodulation, revert to radiofrequency signal, its phase place is
can be expressed as:
Come and go the radiofrequency signal and the source signal that after transmitting, recover and compare phase difference by phase discriminator, draw error phase:
according to this error signal 2 ω Δ τ
path, control tunable laser, change the wavelength of laser to λ+Δ λ, the radiofrequency signal being at this time modulated on light carrier is compared with the radiofrequency signal being modulated on light carrier λ, after Optical Fiber Transmission, has the delay inequality that a dispersion causes: Δ τ
disp=DL Δ λ, wherein, D is the abbe number of monomode fiber, the length that L is optical fiber.
Light signal is delivered to after far-end, through photodetector, reverts to radiofrequency signal, and it has experienced Δ τ
pathwith Δ τ
disptwo kinds of Delay Variations, phase place can be expressed as:
At central station, pass through error signal 2 ω Δ τ
pathchange laser wavelength, it is met
by backoff algorithm, make after compensation loop locking 2 ω Δ τ
path+ 2 ω Δ τ
disp=0, like this
the phase place of far-end frequency standard signal is consistent with the phase preserving of frequency standard source signal, i.e. the transmission phase stabilization of transmission system, so that the frequency of remote signaling also can keep is stable.
In another embodiment of the present invention, for the signal in optical fiber link amplifies, preferably, far-end optical return signal is being imported into same optical fiber to central station, before the demodulation of passback light signal is obtained to return radiofrequency signal, can also comprise: passback light signal is carried out to signal amplification.After passback, and before the far-end modulated light signal that central station is received is demodulated into and stablize far end radio frequency signal and exports, can also comprise: the far-end modulated light signal receiving is carried out to signal amplification.
In one embodiment of the invention, in order to obtain higher-quality radiofrequency signal, preferably, after the demodulation of passback light signal is obtained to return radiofrequency signal, before the phase difference of more described passback radiofrequency signal and described frequency standard signal, can also comprise: described passback radiofrequency signal is carried out to radio frequency amplification and filtering.After the far-end modulated light signal that central station is received is demodulated into and stablizes far end radio frequency signal, before output, can also comprise: described stable far end radio frequency signal is carried out to radio frequency amplification and filtering.
The embodiment of the present invention also proposes a kind of signal time delay stable transfer system of broadband, as shown in Figure 3, comprising:
Rf frequency standard source 1, is connected with phase discriminator with central station electrooptic modulator respectively, for produce stable frequency standard signal at central station;
Central station electrooptic modulator 3, is also connected with optical fiber, for described frequency standard signal is modulated to described light carrier, forms initial optical signal;
Optical fiber 4, is also connected with upstream device, far-end electrooptic modulator and central station photodetector respectively, for described initial optical signal is transferred to far-end;
Upstream device 5, for importing far-end optical return signal into same optical fiber to central station; Far-end modulated light signal is returned;
Phase discriminator 7, for the phase difference of more described passback radiofrequency signal and described frequency standard signal;
Far end radio frequency signal source 9, for inputting broadband rf signal from far-end;
Far-end electrooptic modulator 10, is modulated to the broadband rf signal of far-end input on far-end light signal, becomes far-end modulated light signal.
In one embodiment of the invention, as shown in Figure 4, for make compensated optical signal after Optical Fiber Transmission with the dispersion delay inequality of initial light carrier, add up to zero with phase difference, preferably, compensation control unit 8 can comprise:
Phase difference calculating subelement 11, for calculating the phase difference of described passback radiofrequency signal and described frequency standard signal:
The centre frequency that makes described frequency standard signal is ω, and initial phase is
initial optical carrier wavelength is λ, and optical fiber link is because the time delay disturbance of variations in temperature and vibration introducing is Δ τ
path, the phase place of passback radiofrequency signal is
for calculating the formula of phase difference, be
Wavelength shift subelement 12, is λ+Δ λ for controlling tunable laser change optical maser wavelength, and it is met
wherein, D is the abbe number of monomode fiber, the length that L is optical fiber.
In another embodiment of the present invention, preferably, upstream device 5 can be: faraday rotation mirror, and/or, far-end optical circulator.
In one embodiment of the invention, preferably, can also comprise: central station optical circulator 13, is connected with central station electrooptic modulator, optical fiber and central station photodetector respectively, clockwise for the sequential delivery of control centre's station light signal.
In another embodiment of the present invention, for passback light signal and far-end modulated light signal are amplified, preferably, can also comprise: central station erbium-doped fiber amplifier 14, be connected between optical fiber and central station photodetector, for passback light signal and far-end modulated light signal are carried out to signal amplification.
In one embodiment of the invention, in order to obtain better radiofrequency signal, preferably, can also comprise: passback radio frequency amplifier 15, is connected with central station photodetector, for described passback radiofrequency signal is carried out to radio frequency amplification; Passback filter 16, is connected between passback radio frequency amplifier and phase discriminator, for the passback radiofrequency signal after radio frequency is amplified, carries out filtering.Output radio frequency amplifier 17, is connected with central station photodetector, for described stable far end radio frequency signal is carried out to radio frequency amplification; Output filter 18, is connected between output radio frequency amplifier and output, for the stable far end radio frequency signal after radio frequency is amplified, carries out filtering.
To utilize dispersion delay compensation, the rf frequency signal of 1205MHz and 2460MHz is returned as example below, illustrate the implementation procedure of one embodiment of the invention.As shown in Figure 5, Figure 6:
Step 501: produce stable frequency standard signal at central station.
In this step, at central station, produce the rf frequency standard source of a 2420MHz, as stable single-frequency point frequency standard signal.
Step 502: utilize tunable laser to produce light carrier.
Step 503: frequency standard signal is modulated on light carrier, forms initial optical signal.
In this step, utilize electrooptic modulator that frequency standard signal is modulated on laser, form initial light carrier.
Step 504: initial optical signal is transmitted through the fiber to far-end.
In the embodiment of the present invention, utilize the optical fiber that length is 10km, initial optical signal is transferred to far-end by optical circulator.
Step 505: import far-end optical return signal into same optical fiber to central station.
In this step, utilize faraday rotation mirror, far-end light signal is back to central station through far-end optical circulator.
Step 506: passback light signal signal is amplified.
In this step, utilize central station erbium-doped fiber amplifier to amplify the light signal of passback.
Step 507: the passback light signal demodulation after amplifying is obtained returning radiofrequency signal.
In this step, utilize central station photodetector to carry out demodulation to passback light signal, obtain returning radiofrequency signal.
Step 508: passback radiofrequency signal is carried out to filtering.
Step 509: the phase difference that relatively returns radiofrequency signal and frequency standard signal.
In this step, the centre frequency that makes frequency standard signal is ω, and initial phase is
initial optical carrier wavelength is λ, and optical fiber link is because the delay variation of variations in temperature and vibration introducing is Δ τ
path, the phase place of passback radiofrequency signal is
for calculating the formula of phase difference, be
Step 510: control tunable laser according to phase difference and change optical carrier wavelength, be compensated light carrier.
In this step, need to control tunable laser change optical carrier wavelength is λ+Δ λ, and it is met
wherein, D is the abbe number of monomode fiber, the length that L is optical fiber.
Step 511: from far-end input broadband rf signal.
In this step, the broadband rf signal of far-end input rf frequency standard source best and central station is distinguished to some extent, to distinguish better two groups of signals on light carrier.In embodiments of the present invention, from far-end, input respectively the far end radio frequency signal of 1205MHz and 2460MHz.
Step 512: the broadband rf signal of far-end input is modulated on far-end light signal, becomes far-end modulated light signal, and passback.
Step 513: far-end modulated light signal is amplified.
Step 514: the far-end modulated light signal after amplifying is demodulated into and stablizes far end radio frequency signal.
Step 515: the stable far end radio frequency signal after demodulation is carried out to filtering, and output.
So far, complete the embodiment of the present invention optical fiber link has been carried out to dispersion delay compensation, and from far-end input, from central station, received the overall process of the far end radio frequency signal of stable passback.
It should be noted that, the above-mentioned a kind of preferred implementation procedure of describing the signal time delay stable transfer method that is broadband of the present invention based on all flow processs of Fig. 5, in the actual realization of frequency stabilization transmission method of the present invention, can on the basis of flow process shown in Fig. 2, carry out as required random variation, can be to select the arbitrary steps in Fig. 5 to realize, the sequencing of each step also can be adjusted etc. as required.
The phase noise reduction factor of two signals of the embodiment of the present invention before and after compensation all can reach 30, and along with the increase of testing time, inhibition can further improve.Visible, the embodiment of the present invention is obvious to the inhibitory action of optical fiber link phase delay.
Visible, the embodiment of the present invention has following beneficial effect:
In the signal time delay stable transfer method and system in the broadband proposing in the embodiment of the present invention, by relatively coming and going the passback radiofrequency signal of transmission and the phase difference of rf frequency standard signal, draw the delay variation of optical fiber link, then utilize tunable laser to change optical maser wavelength, while transmitting in optical fiber by different wave length, produce different dispersion time delays and compensate this shake, finally realize the radiofrequency signal output of far-end stabilized frequency and phase place.The embodiment of the present invention utilizes optical fiber simultaneously as transmission medium and compensating device, without adding extra compensating device, realizes phase jitter compensation process, and system configuration is simple, practical.
In addition, the embodiment of the present invention obtains different dispersion time delays by change optical maser wavelength and shakes with compensated fiber link, and compensation range is larger, and because dispersion time delay is directly proportional to the length of optical fiber, optical fiber is longer, and the scope of compensation is also larger; Meanwhile, the embodiment of the present invention can guarantee that the overall delay of optical fiber link keeps constant, can on link, regulate the rf frequency standard signal of different frequency and transmit, and being with of institute's relays link is roomy, and is applicable to the transmission of time signal.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. the signal time delay stable transfer method in broadband, is characterized in that, comprising:
At central station, produce stable frequency standard signal;
Utilize tunable laser to produce light carrier;
Described frequency standard signal is modulated on described light carrier, forms initial optical signal;
Described initial optical signal is transmitted through the fiber to far-end;
Import far-end optical return signal into same optical fiber to central station;
The demodulation of passback light signal is obtained returning radiofrequency signal;
The phase difference of more described passback radiofrequency signal and described frequency standard signal;
According to described phase difference, control tunable laser and change optical carrier wavelength, be compensated light carrier, make compensating light carrier wave after Optical Fiber Transmission with the dispersion delay inequality of initial light carrier, the chain-circuit time delay shake causing with described phase difference adds up to zero;
From far-end input broadband rf signal;
The broadband rf signal of far-end input is modulated on described far-end light signal, becomes far-end modulated light signal, and passback;
The far-end modulated light signal that central station is received is demodulated into stablizes far end radio frequency signal output.
2. the signal time delay stable transfer method in broadband according to claim 1, is characterized in that, described in make compensating light carrier wave after Optical Fiber Transmission with the dispersion delay inequality of initial light carrier, the chain-circuit time delay shake causing with described phase difference adds up to zero and comprises:
The centre frequency that makes described frequency standard signal is ω, and initial phase is
initial optical carrier wavelength is λ, and optical fiber link is because the chain-circuit time delay of variations in temperature and vibration introducing is dithered as Δ τ
path, the phase place of passback radiofrequency signal is
obtaining phase difference is
Controlling tunable laser change optical maser wavelength is λ+Δ λ, and it is met
wherein, D is the abbe number of monomode fiber, the length that L is optical fiber.
3. the signal time delay stable transfer method in broadband according to claim 1 and 2, is characterized in that:
Described, import far-end optical return signal into same optical fiber to central station, described the demodulation of passback light signal is obtained to return radiofrequency signal before, also comprise: to passback light signal carry out signal amplification;
And/or, after described passback, and the described far-end modulated light signal that central station is received be demodulated into stablize far end radio frequency signal and output before, also comprise: the far-end modulated light signal receiving is carried out to signal amplification.
4. the signal time delay stable transfer method in broadband according to claim 1 and 2, is characterized in that:
Described the demodulation of passback light signal is obtained to return radiofrequency signal after, before the phase difference of described passback radiofrequency signal and described frequency standard signal, also comprise: described passback radiofrequency signal is carried out to radio frequency amplification and filtering;
And/or, after the described far-end modulated light signal that central station is received is demodulated into and stablizes far end radio frequency signal, before output, also comprise: described stable far end radio frequency signal is carried out to radio frequency amplification and filtering.
5. the signal time delay stable transfer system in a broadband, it is characterized in that, comprise: rf frequency standard source, tunable laser, central station electrooptic modulator, optical fiber, upstream device, central station photodetector, phase discriminator, compensation control unit, far end radio frequency signal source and far-end electrooptic modulator, wherein:
Rf frequency standard source, is connected with phase discriminator with central station electrooptic modulator respectively, for produce stable frequency standard signal at central station;
Tunable laser, is connected with compensation control unit with central station electrooptic modulator respectively, for generation of light carrier;
Central station electrooptic modulator, is also connected with optical fiber, for described frequency standard signal is modulated to described light carrier, forms initial optical signal;
Optical fiber, is also connected with upstream device, far-end electrooptic modulator and central station photodetector respectively, for described initial optical signal is transferred to far-end;
Upstream device, for importing far-end optical return signal into same optical fiber to central station; Far-end modulated light signal is returned;
Central station photodetector, is also connected with phase discriminator, for the demodulation of passback light signal is obtained returning radiofrequency signal; The far-end modulated light signal that central station is received is demodulated into stablizes far end radio frequency signal output;
Phase discriminator, for the phase difference of more described passback radiofrequency signal and described frequency standard signal;
Compensation control unit, be connected with tunable laser with phase discriminator, for controlling tunable laser according to described phase difference, change optical carrier wavelength, be compensated light carrier, make compensating light carrier wave after Optical Fiber Transmission with the dispersion delay inequality of initial light carrier, the chain-circuit time delay shake causing with described phase difference adds up to zero;
Far end radio frequency signal source, for inputting broadband rf signal from far-end;
Far-end electrooptic modulator, is modulated to the broadband rf signal of far-end input on far-end light signal, becomes far-end modulated light signal.
6. the signal time delay stable transfer system in broadband according to claim 5, is characterized in that, described compensation control unit comprises:
Phase difference calculating subelement, for calculating the phase difference of described passback radiofrequency signal and described frequency standard signal:
The centre frequency that makes described frequency standard signal is ω, and initial phase is
initial optical carrier wavelength is λ, and optical fiber link is because the delay variation of variations in temperature and vibration introducing is Δ τ
path, the phase place of passback radiofrequency signal is
for calculating the formula of phase difference, be
Wavelength shift subelement, is λ+Δ λ for controlling tunable laser change optical carrier wavelength, and it is met
wherein, D is the abbe number of monomode fiber, the length that L is optical fiber.
7. the signal time delay stable transfer system in broadband according to claim 5, is characterized in that:
Described upstream device is: faraday rotation mirror, and/or, far-end optical circulator.
8. the signal time delay stable transfer system in broadband according to claim 5, is characterized in that, described system also comprises:
Central station optical circulator, is connected clockwise with central station electrooptic modulator, optical fiber and central station photodetector respectively, for the sequential delivery of control centre's station light signal.
9. according to the signal time delay stable transfer system in the broadband described in any one in claim 5 to 8, it is characterized in that, described system also comprises:
Central station erbium-doped fiber amplifier, is connected between optical fiber and central station photodetector, for passback light signal and far-end modulated light signal are carried out to signal amplification.
10. according to the signal time delay stable transfer system in the broadband described in any one in claim 5 to 8, it is characterized in that, described system also comprises:
Passback radio frequency amplifier, is connected with central station photodetector, for described passback radiofrequency signal is carried out to radio frequency amplification; Passback filter, is connected between passback radio frequency amplifier and phase discriminator, for the passback radiofrequency signal after radio frequency is amplified, carries out filtering;
And/or output radio frequency amplifier, is connected with central station photodetector, for described stable far end radio frequency signal is carried out to radio frequency amplification; Output filter, is connected between output radio frequency amplifier and output, for the stable far end radio frequency signal after radio frequency is amplified, carries out filtering.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008062129A1 (en) * | 2008-12-16 | 2010-06-17 | Tesa Se | Self-adhesive base polymer for electroluminescent materials |
| CN102801469A (en) * | 2012-09-11 | 2012-11-28 | 中国人民解放军理工大学 | Optical fiber time frequency hybrid transmission method |
-
2013
- 2013-12-09 CN CN201310662454.0A patent/CN103701529A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008062129A1 (en) * | 2008-12-16 | 2010-06-17 | Tesa Se | Self-adhesive base polymer for electroluminescent materials |
| CN102801469A (en) * | 2012-09-11 | 2012-11-28 | 中国人民解放军理工大学 | Optical fiber time frequency hybrid transmission method |
Non-Patent Citations (1)
| Title |
|---|
| ANXU ZHANG等: ""Stabel radio frequency delivery by dispersion induced optical tunable delay"", 《OPTICS LETTERS》 * |
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