CN115378499B - Instantaneous frequency measuring device and method based on microwave photon technology - Google Patents
Instantaneous frequency measuring device and method based on microwave photon technology Download PDFInfo
- Publication number
- CN115378499B CN115378499B CN202210779835.6A CN202210779835A CN115378499B CN 115378499 B CN115378499 B CN 115378499B CN 202210779835 A CN202210779835 A CN 202210779835A CN 115378499 B CN115378499 B CN 115378499B
- Authority
- CN
- China
- Prior art keywords
- optical
- frequency
- signal
- radio frequency
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
-
- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
The invention provides an instantaneous frequency measuring device and an instantaneous frequency measuring method based on a microwave photon technology, and relates to the technical field of microwave signal frequency measurement. The device comprises an optical frequency comb signal source, a plurality of modulators, an optical switch, a plurality of Fabry-Perot (FP) filters, an optical coupler, an optical amplifier, a wavelength division multiplexer, an optical power detection array, an optical detector, a low-pass electric filter, a signal processing module and a radio frequency signal source generating module, wherein the advantage of ultra wideband signal processing of a microwave photon technology is utilized by the device, the rapid confirmation of the signal frequency position in an ultra wideband frequency range is realized by reconstructing a multiplexing channelized division mode, the frequency is simultaneously converted into a low frequency range, and finally the high-precision acquisition and measurement of a low frequency signal are realized by combining a mature electronic signal processing technology, so that the ultra wideband, high-precision and rapid frequency measurement is realized.
Description
Technical Field
The invention relates to the technical field of microwave signal frequency measurement, in particular to an instantaneous frequency measurement device and an instantaneous frequency measurement method based on a microwave photon technology.
Background
The microwave photon technology is not affected by electromagnetic interference, has obvious advantages in the aspects of volume, weight and energy consumption compared with a microwave device, and particularly has the signal processing capability advantage in the ultra-wideband aspect, so that the microwave photon technology is widely focused and applied in the field of frequency measurement.
The current radio frequency signal frequency measurement technology based on the microwave photon technology is mainly based on four methods, namely a frequency intensity mapping method, a frequency time mapping method, a sweep frequency receiving method and a channelized receiving method. The first frequency intensity mapping method is to design a frequency-related microwave photon link, and generally, a multipath signal interference method is adopted to enable different microwave signals to obtain different response values of microwaves or optical power after passing through an optical link, so that the frequency of an input microwave signal is determined according to the response values, but the method is generally limited in measurement frequency range and difficult to achieve high frequency measurement accuracy. The second, frequency time mapping method is to modulate the measured radio frequency signal on the optical carrier, utilize some medium such as the dispersion optic fibre and so on with large dispersion coefficient, separate the light modulation sideband signal of different microwave components on the time domain, then carry on photoelectric conversion, the time that the light pulse arrives at the photoelectric detector of receiving end is proportional to the frequency of the microwave signal modulated on the optical carrier, through measuring the time that different frequency components arrive at the photoelectric detector, can calculate and get the frequency value of the signal modulated on the optical carrier, its frequency measurement precision and resolution ratio are limited when the radio frequency is lower, only is suitable for the measurement of the high frequency, it is difficult to realize the full frequency band pull-through measurement of the low frequency to the high frequency. The third and the sweep frequency receiving methods generally carry out frequency-dependent scanning filtering or amplifying on the modulated optical signals by a filter or stimulated Brillouin amplifying method and the like, and the method needs to periodically scan in the whole frequency measuring range, and has long time consumption and slow measuring speed. Fourth, the channelized receiving method is to divide different frequencies into different channels by optical channelized processing of the modulated optical signals, so as to realize measurement of microwave signals.
Therefore, based on the above analysis, it is necessary to develop and develop a method and a device for measuring the frequency of microwave signals, which can simultaneously realize ultra-wideband, high frequency measurement accuracy and high speed.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides an instantaneous frequency measuring device and an instantaneous frequency measuring method based on a microwave photon technology, which solve the technical problem that ultra-wideband, high frequency measuring precision and rapid microwave signal frequency measurement cannot be realized at the same time.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the instantaneous frequency measuring device based on the microwave photon technology comprises an optical frequency comb signal source, a plurality of modulators, an optical switch, a plurality of FP filters, an optical coupler, an optical amplifier, a wavelength division multiplexer, an optical power detection array, an optical detector, a low-pass electric filter, a signal processing module and a radio frequency signal source generating module;
the light outlet of the light frequency comb signal source is connected with the light inlet of the first modulator, the light outlet of the first modulator is connected with the input end of the optical switch, and the radio frequency input end of the first modulator is used for receiving the tested radio frequency signal;
the output end of the optical switch is respectively connected with the input end of the first FP filter, the light inlets of the second modulators and the light inlet of the third modulator; the light outlet of any second modulator is connected with the input end of the corresponding second FP filter;
the output ends of the first FP filter and the second FP filter are connected with the input end of an optical coupler, the output end of the optical coupler is connected with the input end of a wavelength division multiplexer through an optical amplifier, each output end of the wavelength division multiplexer is connected with the corresponding input end of an optical power detection array, and the output end of the optical power detection array is connected to a signal processing module;
the light outlet of the third modulator is connected with the input end of the optical detector, and the optical detector is connected to the signal processing module through a low-pass electric filter;
the output end of the signal processing module is connected with the input end of the radio frequency signal source generating module, and each output end of the radio frequency signal source generating module is respectively connected with the radio frequency input ends of the second modulator and the third modulator;
wherein, the number of comb teeth in the optical frequency comb, the number of channels of the first FP filter and the second FP filter are the same as the number of channels of the wavelength division multiplexer.
Preferably, the frequency interval between the comb teeth of the optical frequency comb is not less than 2 times of the maximum frequency of the detected radio frequency signal; the channel bandwidth of the wavelength division multiplexer is equal to the comb teeth.
Preferably, the optical frequency comb signal source comprises a coherent optical frequency comb which is formed by multiplexing a plurality of laser outputs with different wavelengths and combining the laser outputs, or a coherent optical frequency comb which is formed by modulating laser light with single wavelength to generate a plurality of comb teeth.
Preferably, the number of the second modulators is 2, the number of the corresponding second FP filters is also 2, and the number of the comb teeth in the optical frequency comb is set to be N
The passband bandwidth of the first FP filter is the frequency range f of the detected radio frequency signal BW 1/N of its free spectral range f sr1 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr1 ＝f c +f BW N, and the initial position of the first channel of the first FP filter corresponds to the sideband position of the first optical comb teeth modulated by the lowest frequency radio frequency signal in the measuring range;
the passband bandwidth of the first said second FP filter is 1/N of the frequency range of the tested radio frequency signal 2 Its free spectral range f sr2 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr2 ＝ f c +f BW /N 2 The starting position of the first channel of the second FP filter is the same as the starting position of the first channel of the first FP filter;
the passband bandwidth of the second FP filter is 1/N of the frequency range of the detected radio frequency signal 3 Its free spectral range f sr3 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr3 ＝ f c +f BW /N 3 The starting position of the first channel of the second FP filter is also the same as the starting position of the first channel of the first FP filter;
the bandwidth of the low-pass electric filter is the frequency range f of the detected radio frequency signal BW 1/N of (2) 3 。
An instantaneous frequency measuring method based on microwave photon technology adopts the instantaneous frequency measuring device, comprising the following steps:
the optical frequency comb signal source generates an optical signal, the optical signal is input into the first modulator, the detected radio frequency signal carries out double-sideband modulation on the optical signal, and the modulated optical signal is input into the optical switch of one fourth;
the optical switch is switched into a first state, the modulated optical signal is switched to be filtered through a first FP filter, then the filtered optical signal is input into the wavelength division multiplexer through an optical coupler and an optical amplifier to be demultiplexed, and the corresponding channel of the only optical signal is determined through the optical power detection array at the same time for separating the optical power of each channel output by the wavelength division multiplexer, so that the frequency of the detected radio frequency signal is determined to be in one of equal parts under the frequency measurement range N;
according to the detection result of the optical signal channel in the first state, the signal processing module controls the optical switch to be switched into the second state, and controls the radio frequency signal source generating module to output a first local oscillator radio frequency signal to carry out single-sideband modulation of the lower sideband of the first second modulator; the modulated optical side band is filtered by a first FP filter and a second FP filter to determine the corresponding channel of the only optical signal, thereby determining that the frequency of the detected radio frequency signal falls in the frequency measuring range N 2 One of the aliquots under the aliquot;
according to the detection result of the optical signal channel in the second state, the signal processing module controls the optical switch to be switched into the third state, and controls the radio frequency signal source generating module to output a second local oscillator radio frequency signal to carry out single-sideband modulation of the lower sideband of the second modulator; the modulated optical side band is filtered by a second FP filter to determine the corresponding channel of the unique optical signal, thereby determining that the frequency of the detected radio frequency signal falls in the frequency measuring range N 3 One of the aliquots under the aliquot;
according to the detection result of the optical signal channel in the third state, the signal processing module controls the optical switch to enter a fourth state, and controls the radio frequency signal source generating module to output a third local oscillator radio frequency signal to carry out single-sideband modulation of the lower sideband of the third modulator; the modulated light band is input into a light detector for photoelectric conversion, then filtered by a low-pass electric filter, and the signal output after frequency conversion and filtration is obtained, and finally the frequency of the tested radio frequency signal is obtained through analysis of electric acquisition.
Preferably, the first local oscillator radio frequency signal has a size f 2 ＝(k 1 -1)×f BW /N；
The second local oscillator radio frequency signal has the size f 3 ＝(k 1 -1)×f BW /N+(k 2 - 1)×f BW /N 2 ；
The third local oscillator radio frequency signal has the size f 4 ＝(k 1 -1)×f BW /N+(k 2 - 1)×f BW /N 2 +(k 3 -1)×f BW /N 3 ；
Wherein k is 1 、k 2 、k 3 The number of the optical signal channels in the first state, the second state and the third state is respectively.
Preferably, the signal output after frequency conversion and filtering is defined as Δf, and the calculation process of the frequency of the tested radio frequency signal is expressed as: f (f) 1 ＝(k 1 -1)×f BW /N+(k 2 -1)×f BW /N 2 + (k 3 -1)×f BW /N 3 +Δf。
(III) beneficial effects
The invention provides an instantaneous frequency measuring device and an instantaneous frequency measuring method based on a microwave photon technology. Compared with the prior art, the method has the following beneficial effects:
the invention utilizes the advantage of ultra wideband signal processing by microwave photon technology, rapidly confirms the signal frequency position in the ultra wideband frequency range and simultaneously converts the frequency into the low frequency range by a reconstruction multiplexing channelized division mode, and finally combines the mature electronic signal processing technology to collect and measure the low frequency signal with high precision, thereby realizing ultra wideband, high precision and rapid frequency measurement.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an instantaneous frequency measurement device based on a microwave photon technology according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another instantaneous frequency measurement device based on microwave photon technology according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the application solves the technical problem that ultra-wideband, high frequency measurement precision and rapid microwave signal frequency measurement cannot be realized simultaneously by providing the instantaneous frequency measurement device and the method based on the microwave photon technology.
The technical scheme in the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
aiming at the defects of the existing ultra-wideband microwave signal instantaneous frequency measurement technology, the embodiment of the invention provides an instantaneous frequency measurement method and device based on a microwave photon technology, which exert the advantages of ultra-wideband and real-time processing of the microwave photon technology and combine with a mature electronic signal processing technology, thereby realizing the rapid and fine measurement of the ultra-wideband microwave signal.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1:
as shown in fig. 1, an embodiment of the present invention provides an instantaneous frequency measurement device based on a microwave photon technology, which includes an optical frequency comb signal source, a plurality of modulators, an optical switch, a plurality of FP filters (fabry-perot filters), an optical coupler, an optical amplifier, a wavelength division multiplexer, an optical power detection array, an optical detector, a low-pass filter, a signal processing module, and a radio frequency signal source generating module.
The light outlet of the optical frequency comb signal source is connected with the light inlet of a first modulator (namely modulator 1 in fig. 1), the light outlet of the first modulator is connected with the input end of the optical switch, and the radio frequency input end of the first modulator is used for receiving the tested radio frequency signal;
the output end of the optical switch is respectively connected with the input end of the first FP filter (namely the FP filter 1 in fig. 1), the light inlet of a plurality of second modulators (namely the modulator 2 in fig. 1) and the light inlet of a third modulator (namely the modulator M in fig. 1); the light outlet of any second modulator is connected with the input end of a corresponding second FP filter (namely modulation 2 in figure 1);
the output ends of the first FP filter and the second FP filter are connected with the input end of an optical coupler, the output end of the optical coupler is connected with the input end of a wavelength division multiplexer through an optical amplifier, each output end of the wavelength division multiplexer is connected with the corresponding input end of an optical power detection array, and the output end of the optical power detection array is connected to a signal processing module;
the light outlet of the third modulator is connected with the input end of the optical detector, and the optical detector is connected to the signal processing module through a low-pass electric filter;
the output end of the signal processing module is connected with the input end of the radio frequency signal source generating module, and each output end of the radio frequency signal source generating module is respectively connected with the radio frequency input ends of the second modulator and the third modulator;
wherein, the number of comb teeth in the optical frequency comb, the number of channels of the first FP filter and the second FP filter are the same as the number of channels of the wavelength division multiplexer.
In particular, the optical frequency comb signal source comprises a coherent optical frequency comb which is formed by multiplexing a plurality of laser outputs with different wavelengths and outputting incoherent light, or a coherent optical frequency comb which is formed by modulating laser light with single wavelength to generate a plurality of comb teeth. The frequency interval between comb teeth of the optical frequency comb is not less than 2 times of the maximum frequency of the detected radio frequency signal; the channel bandwidth of the wavelength division multiplexer is equal to the comb teeth.
In addition, the number of the second modulators is not specifically limited in the embodiment of the present invention, and those skilled in the art may specifically select the second modulators according to actual needs. It should be noted, however, that one of the preferred schemes may be:
as shown in fig. 2, if the number of the second modulators is 2, the number of the corresponding second FP filters is also 2, and if the number of the comb teeth in the optical frequency comb is set to N, then at this time:
the passband bandwidth of the first FP filter is the frequency range f of the detected radio frequency signal BW 1/N of its free spectral range f sr1 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr1 ＝ f c +f BW N, and the initial position of the first channel of the first FP filter corresponds to the sideband position of the first optical comb teeth modulated by the lowest frequency radio frequency signal in the measuring range;
the passband bandwidth of the first said second FP filter is 1/N of the frequency range of the tested radio frequency signal 2 Its free spectral range f sr2 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr2 ＝ f c +f BW /N 2 The starting position of the first channel of the second FP filter is the same as the starting position of the first channel of the first FP filter;
the passband bandwidth of the second FP filter is 1/N of the frequency range of the detected radio frequency signal 3 Its free spectral range f sr3 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr3 ＝ f c +f BW /N 3 The starting position of the first channel of the second FP filter is also the same as the starting position of the first channel of the first FP filter;
the bandwidth of the low-pass electric filter is the frequency range f of the detected radio frequency signal BW 1/N of (2) 3 。
Example 2:
the embodiment of the invention relates to an instantaneous frequency measuring method based on a microwave photon technology, which specifically adopts the instantaneous frequency measuring device (at the moment, an optical switch is a one-to-four switch) with the number of limiting second modulators being 2.
The embodiment takes the frequency measurement of the RF signal to be measured in the ultra-wideband range of 1-100 GHz as an example, and the frequency f of the RF signal to be measured is specifically selected without losing the generality 1 As verification, = 38.651 GHz.
Correspondingly, the frequency interval f of the comb teeth of the optical frequency comb signal c Not less than 200GHz, f is selected c For example, =200 GHz, the channel bandwidth of the wavelength division multiplexer is also 200GHz. In addition, the number of comb teeth in the optical frequency comb is limited, the number of channels of the first FP filter and the second FP filter is N=10, and the number of channels of the wavelength division multiplexer is N=10.
It should be understood that the number of channels, the number of switches of the optical switch, the number of teeth of the optical frequency comb, and the like are all selected as examples, and should not be construed as limiting the inventive protection scope of the present invention.
The instantaneous frequency measurement method is now described in detail as follows:
the first step: the optical frequency comb signal source generates an optical signal and inputs the optical signal into the first modulator, the detected radio frequency signal carries out double-sideband modulation on the optical signal, and the modulated optical signal is input into the optical switch of one fourth.
And a second step of:
first, since the embodiment of the present invention defines n=10, the passband bandwidth of the first FP filter is the measured rf signal frequency range f BW 1/10 of the free spectral range f, i.e. 10GHz sr1 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr1 ＝f c +f BW / N＝210GHz。
Specifically, the optical switch is switched to enter a first state, the modulated optical signal is switched to be filtered through a first FP filter, then is input into the wavelength division multiplexer to be demultiplexed through the optical coupler and the optical amplifier, the optical power of 10 channels output by the wavelength division multiplexer is simultaneously separated by the optical power detection array, the corresponding channel of the only optical signal is determined, only the 4 th channel after the wavelength division multiplexing has the optical signal at the moment, and therefore the frequency of the detected radio frequency signal is determined to fall in one of equal parts under the frequency measurement range N, and the frequency of the detected optical signal can be determined to fall between 30GHz and 40 GHz.
And a third step of:
first, since the embodiment of the present invention defines n=10, the passband bandwidth of the first and second FP filters is the measured rf signal frequency range f BW 1/10 of (2) 2 I.e. 1GHz, its free spectral range f sr2 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr2 ＝f c + f BW /N 2 ＝201GHz。
Specifically, according to the detection result of the optical signal channel in the first state, the signal processing module controls the optical switch to switch into the second state, and controls the radio frequency signal source generating module to output the first local oscillator radio frequency signal to perform single-sideband modulation on the lower sideband of the first second modulator.
Wherein the first local oscillator radio frequency signal has a size f 2 ＝(k 1 -1)×f BW /N， k 1 =4 is the ordinal number of the optical signal channel in the first state, f 2 ＝30GHz。
The modulated optical side band is filtered by a first FP filter and a second FP filter, then is input into a wavelength division multiplexer for demultiplexing through an optical coupler and an optical amplifier, and the corresponding channel of the unique optical signal is determined by the optical power of 10 channels output by the optical power detection array at the same time by the wavelength division multiplexer, and only the 9 th channel after the wavelength division multiplexing has the optical signal at the moment, so that the radio frequency signal to be detected is determinedThe frequency of the number falls within the frequency measurement range N 2 In one of the equal divisions, the frequency of the detected radio frequency signal can be judged to fall between 38GHz and 39GHz by combining the filtering result of the previous first FP filter.
Fourth step:
first, since the embodiment of the present invention defines n=10, the passband bandwidth of the second FP filter is the measured rf signal frequency range f BW 1/10 of (2) 3 I.e. 100MHz, free spectral range f sr3 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr3 ＝f c + f BW /N 2 ＝200.1GHz。
Specifically, according to the detection result of the optical signal channel in the second state, the signal processing module controls the optical switch to enter the third state, and controls the radio frequency signal source generating module to output the second local oscillator radio frequency signal to perform single-sideband modulation on the lower sideband of the second modulator.
Wherein the second local oscillator radio frequency signal has a size of
For the ordinal number of the optical signal path in the second state, f 3 ＝38GHz。
The modulated optical side band is filtered by a second FP filter, then is input into a wavelength division multiplexer for demultiplexing through an optical coupler and an optical amplifier, and the corresponding channel of the unique optical signal is determined by the optical power of 10 channels output by the optical power detection array at the same time by the wavelength division multiplexer, and only the 7 th channel after the wavelength division multiplexing has the optical signal at the moment, so that the frequency of the detected radio frequency signal is determined to be in the frequency measuring range N 3 In one of the equal divisions, the frequency of the detected radio frequency signal can be judged to fall between 38.6GHz and 38.7GHz by combining the filtering result of the first and second FP filters.
Fifth step:
first, since the embodiment of the present invention defines n=10, the bandwidth of the low-pass filter is the frequency range f of the detected rf signal BW 1/10 of (2) 3 I.e. 100MHz.
Specifically, according to the detection result of the optical signal channel in the third state, the signal processing module controls the optical switch to enter the fourth state, and controls the radio frequency signal source generating module to output the third local oscillator radio frequency signal to perform single sideband modulation on the lower sideband of the third modulator.
Wherein the third local oscillator radio frequency signal has a size f 4 ＝(k 1 -1)×f BW /N+ (k 2 -1)×f BW /N 2 +(k 3 -1)×f BW /N 3 ，k 3 =7 is the ordinal number of the optical signal channel in the second state, f 4 ＝38.6GHz。
The modulated optical sideband is input into an optical detector for photoelectric conversion, then is filtered by a low-pass electric filter, and a signal output delta f=0.051 GHz after frequency conversion and filtering is obtained, and the frequency of a detected radio frequency signal is finally obtained through analysis of electric acquisition:
thereby realizing the frequency measurement of the measured radio frequency signal.
In summary, compared with the prior art, the method has the following beneficial effects:
the invention utilizes the advantage of ultra wideband signal processing by microwave photon technology, rapidly confirms the signal frequency position in the ultra wideband frequency range and simultaneously converts the frequency into the low frequency range by a reconstruction multiplexing channelized division mode, and finally combines the mature electronic signal processing technology to collect and measure the low frequency signal with high precision, thereby realizing ultra wideband, high precision and rapid frequency measurement.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The instantaneous frequency measuring device based on the microwave photon technology is characterized by comprising an optical frequency comb signal source, a plurality of modulators, an optical switch, a plurality of FP filters, an optical coupler, an optical amplifier, a wavelength division multiplexer, an optical power detection array, an optical detector, a low-pass electric filter, a signal processing module and a radio frequency signal source generating module;
the light outlet of the light frequency comb signal source is connected with the light inlet of the first modulator, the light outlet of the first modulator is connected with the input end of the optical switch, and the radio frequency input end of the first modulator is used for receiving the tested radio frequency signal;
the output end of the optical switch is respectively connected with the input end of the first FP filter, the light inlets of the second modulators and the light inlet of the third modulator; the light outlet of any second modulator is connected with the input end of the corresponding second FP filter;
the output ends of the first FP filter and the second FP filter are connected with the input end of an optical coupler, the output end of the optical coupler is connected with the input end of a wavelength division multiplexer through an optical amplifier, each output end of the wavelength division multiplexer is connected with the corresponding input end of an optical power detection array, and the output end of the optical power detection array is connected to a signal processing module;
the light outlet of the third modulator is connected with the input end of the optical detector, and the optical detector is connected to the signal processing module through a low-pass electric filter;
the output end of the signal processing module is connected with the input end of the radio frequency signal source generating module, and each output end of the radio frequency signal source generating module is respectively connected with the radio frequency input ends of the second modulator and the third modulator;
wherein, the number of comb teeth in the optical frequency comb, the number of channels of the first FP filter and the second FP filter are the same as the number of channels of the wavelength division multiplexer.
2. The microwave photon technology based instantaneous frequency measurement device according to claim 1, wherein the optical frequency comb signal source comprises a coherent optical frequency comb that is formed by multiplexing a plurality of laser outputs of different wavelengths into a combined output incoherent, or by modulating a single wavelength laser to produce a plurality of comb teeth.
3. The instantaneous frequency measurement device based on the microwave photon technology according to claim 2, wherein the frequency interval between comb teeth of the optical frequency comb is not less than 2 times of the maximum frequency of the measured radio frequency signal; the channel bandwidth of the wavelength division multiplexer is equal to the comb teeth.
4. A device for measuring instantaneous frequency based on microwave photon technology as claimed in any one of claims 1-3, wherein the number of second modulators is 2, the number of corresponding second FP filters is 2, and the number of comb teeth in the optical frequency comb is set to be N
The passband bandwidth of the first FP filter is the frequency range f of the detected radio frequency signal BW 1/N of its free spectral range f sr1 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr1 ＝f c +f BW N, and the initial position of the first channel of the first FP filter corresponds to the sideband position of the first optical comb teeth modulated by the lowest frequency radio frequency signal in the measuring range;
the passband bandwidth of the first said second FP filter is 1/N of the frequency range of the tested radio frequency signal 2 Its free spectral range f sr2 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr2 ＝f c +f BW /N 2 The starting position of the first channel of the second FP filter is the same as the starting position of the first channel of the first FP filter;
the passband bandwidth of the second FP filter is 1/N of the frequency range of the detected radio frequency signal 3 Its free spectral range f sr3 Comb teeth f of comb with optical frequency c The following relationships are satisfied: f (f) sr3 ＝f c +f BW /N 3 The starting position of the first channel of the second FP filter is also the same as the starting position of the first channel of the first FP filter;
the bandwidth of the low-pass electric filter is the frequency range f of the detected radio frequency signal BW 1/N of (2) 3 。
5. A method for measuring instantaneous frequency based on microwave photon technology, characterized in that it adopts the instantaneous frequency measuring device according to claim 4, comprising:
the optical frequency comb signal source generates an optical signal, the optical signal is input into the first modulator, the detected radio frequency signal carries out double-sideband modulation on the optical signal, and the modulated optical signal is input into the optical switch of one fourth;
the optical switch is switched into a first state, the modulated optical signal is switched to be filtered through a first FP filter, then the filtered optical signal is input into the wavelength division multiplexer through an optical coupler and an optical amplifier to be demultiplexed, and the corresponding channel of the only optical signal is determined through the optical power detection array at the same time for separating the optical power of each channel output by the wavelength division multiplexer, so that the frequency of the detected radio frequency signal is determined to be in one of equal parts under the frequency measurement range N;
according to the detection result of the optical signal channel in the first state, the signal processing module controls the optical switch to be switched into the second state, and controls the radio frequency signal source generating module to output a first local oscillator radio frequency signal to carry out single-sideband modulation of the lower sideband of the first second modulator; the modulated optical side band is filtered by a first FP filter and a second FP filter to determine the corresponding channel of the only optical signal, thereby determining that the frequency of the detected radio frequency signal falls in the frequency measuring range N 2 One of the aliquots under the aliquot;
according to the detection result of the optical signal channel in the second state, the signal processing module controls the optical switch to be switched into the third state, and controls the radio frequency signal source generating module to output a second local oscillator radio frequency signal to carry out single-sideband modulation of the lower sideband of the second modulator; the modulated optical side band is filtered by a second FP filter to determine the corresponding channel of the unique optical signal, thereby determining that the frequency of the detected radio frequency signal falls in the frequency measuring range N 3 One of the aliquots under the aliquot;
according to the detection result of the optical signal channel in the third state, the signal processing module controls the optical switch to enter a fourth state, and controls the radio frequency signal source generating module to output a third local oscillator radio frequency signal to carry out single-sideband modulation of the lower sideband of the third modulator; the modulated light band is input into a light detector for photoelectric conversion, then filtered by a low-pass electric filter, and the signal output after frequency conversion and filtration is obtained, and finally the frequency of the tested radio frequency signal is obtained through analysis of electric acquisition.
6. The method for measuring instantaneous frequency based on microwave photon technology as claimed in claim 5, wherein,
the first local oscillator radio frequency signal has a size f 2 ＝(k 1 -1)×f BW /N；
The second local oscillator radio frequency signal has the size f 3 ＝(k 1 -1)×f BW /N+(k 2 -1)×f BW /N 2 ；
The third local oscillator radio frequency signal has the size f 4 ＝(k 1 -1)×f BW /N+(k 2 -1)×f BW /N 2 +(k 3 -1)×f BW /N 3 ；
Wherein k is 1 、k 2 、k 3 The number of the optical signal channels in the first state, the second state and the third state is respectively.
7. The method for measuring instantaneous frequency based on microwave photon technology as claimed in claim 6, wherein the frequency calculation process of the measured radio frequency signal is expressed as: f (f) 1 ＝(k 1 -1)×f BW /N+(k 2 -1)×f BW /N 2 +(k 3 -1)×f BW /N 3 +Δf。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210779835.6A CN115378499B (en) | 2022-07-04 | 2022-07-04 | Instantaneous frequency measuring device and method based on microwave photon technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210779835.6A CN115378499B (en) | 2022-07-04 | 2022-07-04 | Instantaneous frequency measuring device and method based on microwave photon technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115378499A CN115378499A (en) | 2022-11-22 |
| CN115378499B true CN115378499B (en) | 2023-06-30 |
Family
ID=84061589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210779835.6A Active CN115378499B (en) | 2022-07-04 | 2022-07-04 | Instantaneous frequency measuring device and method based on microwave photon technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115378499B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005017129A (en) * | 2003-06-26 | 2005-01-20 | Nippon Telegr & Teleph Corp <Ntt> | Wavelength dispersion measuring device |
| CN102508231A (en) * | 2011-10-28 | 2012-06-20 | 清华大学 | Fabry-Perot interference absolute distance measurement method based on femtosecond optical frequency comb and device thereof |
| CN109104245A (en) * | 2018-09-17 | 2018-12-28 | 中国电子科技集团公司第三十八研究所 | Transmission system when multichannel is steady without the non-co-operation signal of spuious broadband |
| CN111181683A (en) * | 2020-01-08 | 2020-05-19 | 中国船舶重工集团公司第七二四研究所 | Device and design method of ultra-wideband receiver based on microwave photons |
| CN112422179A (en) * | 2020-10-22 | 2021-02-26 | 西安空间无线电技术研究所 | Reconfigurable optical channel flexible extraction system and method based on comb switching |
| CN113138313A (en) * | 2021-03-19 | 2021-07-20 | 北京航空航天大学 | Optical undersampling frequency recovery method based on remainder matching |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9506739B2 (en) * | 2012-12-21 | 2016-11-29 | Magiq Technologies, Inc. | Distance measurement by beating a varying test signal with reference signal having absolute frequency value predetermined with a specified accuracy |
-
2022
- 2022-07-04 CN CN202210779835.6A patent/CN115378499B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005017129A (en) * | 2003-06-26 | 2005-01-20 | Nippon Telegr & Teleph Corp <Ntt> | Wavelength dispersion measuring device |
| CN102508231A (en) * | 2011-10-28 | 2012-06-20 | 清华大学 | Fabry-Perot interference absolute distance measurement method based on femtosecond optical frequency comb and device thereof |
| CN109104245A (en) * | 2018-09-17 | 2018-12-28 | 中国电子科技集团公司第三十八研究所 | Transmission system when multichannel is steady without the non-co-operation signal of spuious broadband |
| CN111181683A (en) * | 2020-01-08 | 2020-05-19 | 中国船舶重工集团公司第七二四研究所 | Device and design method of ultra-wideband receiver based on microwave photons |
| CN112422179A (en) * | 2020-10-22 | 2021-02-26 | 西安空间无线电技术研究所 | Reconfigurable optical channel flexible extraction system and method based on comb switching |
| CN113138313A (en) * | 2021-03-19 | 2021-07-20 | 北京航空航天大学 | Optical undersampling frequency recovery method based on remainder matching |
Non-Patent Citations (3)
| Title |
|---|
| An auto-aligned vertical comb drive for low-cost variable optical attenuators;J. Cheng;《 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS)》;全文 * |
| 基于光子学的微波信号频率测量研究进展;邢俊娜;《 激光技术》;全文 * |
| 基于光子技术的微波频率测量研究进展;邹喜华;卢冰;;数据采集与处理(06);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115378499A (en) | 2022-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108418629B (en) | Broadband microwave measuring device and method based on double-optical-frequency comb | |
| CN111190160B (en) | Microwave photon multiband radar detection method and microwave photon multiband radar | |
| JP3828111B2 (en) | Propagation measuring device and propagation measuring method | |
| CN107069390B (en) | Optical-electronic oscillator | |
| CN109613335B (en) | Microwave signal frequency measurement device and method based on cyclic frequency shift | |
| US7245833B1 (en) | Photonic channelized RF receiver employing dense wavelength division multiplexing | |
| CN106093598B (en) | Electromagnetic signal characteristic measuring system and method | |
| CN102904646B (en) | Polarization multiplexing channelization receiver based on optical comb | |
| CN109257105A (en) | Broadband signal method of reseptance, device and EW receiver | |
| EP3500865B1 (en) | Optical rf spectrum analyser | |
| CN104954066A (en) | Device and method for measuring frequency response of optical device | |
| CN111901035B (en) | Instantaneous microwave frequency measuring device and method based on dispersion Fourier transform | |
| CN113391136A (en) | Microwave photon frequency measurement device and method based on fixed low-frequency detection | |
| CN115378499B (en) | Instantaneous frequency measuring device and method based on microwave photon technology | |
| CN108566244B (en) | Multichannel parallel optical device spectral response measuring method and device | |
| CN111678611B (en) | High repetition frequency femtosecond pulse full-field information real-time measurement system and method | |
| CN111473958B (en) | Pseudo-random code excited optical filter amplitude-frequency response measuring device and method | |
| TWI291814B (en) | Apparatus and method for homodyne detecting quality-factor measuring | |
| CN116626693A (en) | Coherent microwave photon radar detection method and system based on photon frequency multiplication | |
| CN108459422B (en) | Double-passband tunable microwave photon filter | |
| CN110601754B (en) | Optical device spectral response testing device and method based on microwave photon down-conversion | |
| CN112268685B (en) | Optical device frequency response measuring method and measuring device | |
| CN113406388A (en) | Photoelectric detector frequency response testing device and testing method thereof | |
| Andreev et al. | CD monitoring based on Bragg Notch filter reflection spectrum analysis | |
| CN111025000B (en) | Half-wave voltage measuring method and testing system of phase modulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |