CN115267325B - Instantaneous multi-frequency measurement system based on frequency power mapping and channelization - Google Patents
Instantaneous multi-frequency measurement system based on frequency power mapping and channelization Download PDFInfo
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Abstract
An instantaneous multi-frequency measurement system device based on frequency power mapping and channelizing relates to the fields of microwave photonics and optoelectronic devices. The optical output end of the continuous wave laser is divided into three paths, and in the middle branch, the multi-frequency signal to be tested is input into a single-drive Mach-Zehnder modulator to carry out carrier suppression double-sideband modulation, and then the upper sideband is reserved by an optical band pass filter. In the down branch, a phase modulator generates an optical frequency comb with non-flat fading through a local oscillation signal source under the condition of large signal modulation, combines the optical frequency comb with an upper sideband signal reserved in the middle branch, and sends the optical frequency comb to a low-speed photoelectric detector for beat frequency, so that a high-frequency signal is mapped to a low frequency band, and sub-channels are distinguished through the power ratio of the beat frequency signal, and finally the measurement frequency is obtained. The phase modulator of the upper arm and the beam combining part are the same as those of the lower arm, and are used for solving the problem of frequency ambiguity, and the principle is that only the modulation bandwidth of the local oscillation signal source is distinguished.
Description
Technical Field
The invention relates to the fields of microwave photonics and optoelectronic devices, in particular to a frequency power mapping and channelizing instantaneous multi-frequency measurement system.
Background
The instantaneous frequency measurement (Instantaneous frequency measurement, IFM) of a microwave signal is an important aspect of electronic measurement technology, and the signal to be measured is often a series of periodic microwave pulses of narrow duration, and the carrier frequency of each pulse may vary rapidly, in which case multiple cumulative measurements of the signal to be measured cannot be performed, so that the rapid frequency measurement can only be performed within a short period of the pulse duration, and radiation-related information can be acquired at the moment when the radio frequency signal is intercepted by using the instantaneous frequency measurement technology. Limitations of traditional electronic technology in aspects of system bandwidth, processing speed, volume power consumption and the like prevent further development of instantaneous frequency measurement technology; the bottleneck can be broken through by utilizing the microwave photon technology which is gradually mature by the development of the field of optical communication. The research of the high-precision instantaneous frequency measurement theory and method of the microwave signal under the assistance of the optics has important theoretical significance and practical significance for promoting the development of the microwave photon radar, the high-resolution signal detection and the military electronic countermeasure technology.
Frequency measurement systems currently implemented based on photon techniques can be largely divided into three categories, frequency-time mapping, frequency-space mapping, and frequency-power mapping, depending on the implementation. The frequency-power mapping method is essentially to establish an Amplitude Comparison Function (ACF) so as to establish a power function relation between unknown frequency information and an electric optical signal. The method is easy to realize the IFM system with compact structure through research. 2019, chengwu Yang et al have proposed a cascadable IFM system ("Photonic-Assisted Instantaneous Frequency Measurement System Based on a Scalable Structure,"IEEE Photonics Journal,vol.11,pp.5501411-1439,2019), that reduces errors over large bandwidths by multistage cascading using a phase modulator and an intensity modulator in combination with dispersive fibers. In 2020, J.L et al of the present institute proposed an IFM scheme for optical power detection based on dual polarization intensity modulators ("Measurement of Instantaneous Microwave Frequency by Optical Power Monitoring Based on Polarization Interference,"Journal of Lightwave Technology,vol.38,pp.2285-2291,2020.), that enables frequency range and accuracy adjustment. However, in the IFM system under the frequency power mapping method, the measurement range and the accuracy are mutually restricted by the influence of the ACF. In addition, most IFM systems based on frequency-power mapping methods currently cannot achieve multi-frequency measurements. The frequency-space mapping method, also called as channelizing method, is essentially to spatially separate and remap signals in different frequency bands to low frequencies to obtain frequency information thereof. 2022, yuxin Liu et al proposed a multi-frequency measurement system ("Frequency measurement of microwave signals in a wide frequency range based on an optical frequency comb and channelization method,"Applied Optics,vol.61, no.13,pp.3663–3670,2022.). based on an Optical Frequency Comb (OFC) in which a modulated signal is mixed with an optical frequency comb and then passed through a wavelength division multiplexer, and then divided into sub-channels for beat processing. The system can realize high-precision measurement of ultra-high frequency bands, but a large number of filters and detectors are needed after channelizing, so that the system has larger complexity.
Disclosure of Invention
The invention provides an instantaneous multi-frequency measurement system based on frequency power mapping and channelization. In the scheme, a multi-frequency signal is input into a single-drive Mach-Zehnder modulator for carrier suppression modulation, an optical band-pass filter filters out an upper sideband of the carrier suppression modulation, and then the upper sideband signal and a non-flat OFC generated by a phase modulator perform beat frequency at a photoelectric detector with a response bandwidth of an OFC input space. The comb teeth of OFC are determined by the frequency of local oscillation signal, under the condition of large signal modulation, the phase modulator can produce four required channels, and the frequency measuring range of said system is several times of comb teeth of channel. The system maps the high frequency to the low frequency to obtain two beat signals with different powers, and the power ratio of the beat signals determines which channel is in. The measured frequency of the final signal is the starting frequency of the channel in which it is located plus one of the beat frequencies at which the power is greater. However, at certain frequency points, single-phase modulator systems suffer from frequency ambiguity, and thus can be addressed by using another phase modulator with a different modulation bandwidth. The invention comprises the following steps: 1 is different from the traditional frequency-power mapping method, is not limited by the frequency measurement range and the frequency measurement precision, and can adjust the frequency measurement range of the system by adjusting the frequency of the local oscillator, and the precision is not reduced along with the improvement of the frequency measurement range; the division of the sub-channels of the system is judged through the power ratio of the final beat frequency signals, and the channel is divided by using devices such as a wavelength division multiplexer instead of the traditional physical division, so that the complexity of the system is reduced, and the flexibility of the system is improved; 3, the system can solve the problem of simultaneous multi-frequency measurement and is more close to practical application; 4, the system has good robustness and is not influenced by bias voltage drift of the single-drive Mach-Zehnder modulator. The invention can be applied to the field of microwave detection and has important reference value for realizing the simplification of high-bandwidth high-precision instantaneous frequency measurement.
The technical scheme of the invention is as follows:
an instantaneous multi-frequency measurement system based on frequency power mapping and channelization, characterized in that: the measuring system comprises a continuous wave laser, a first optical coupler, a single-drive Mach-Zehnder modulator, a first phase modulator, a second phase modulator, a first radio frequency signal source, a second radio frequency signal source, a third radio frequency signal source, an optical band-pass filter, a first polarization controller, a second polarization controller, a third polarization controller, a second optical coupler, a third optical coupler, a first photoelectric detector, a second photoelectric detector, a first electric signal processing module and a second electric signal processing module; the concrete connection mode is as follows:
The optical output end of the continuous wave laser is connected with the optical input end of the first optical coupler, the optical output end of the first optical coupler is respectively connected with the optical input ends of the single-drive Mach-Zehnder modulator, the first phase modulator and the second phase modulator, the output end of the first radio frequency signal source is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator, the output end of the second radio frequency signal source is connected with the radio frequency input end of the first phase modulator, the optical output end of the single-drive Mach-Zehnder modulator is connected with the optical input end of the optical band pass filter, the optical output end of the optical band pass filter is connected with the optical input end of the first polarization controller, the optical output end of the first phase modulator is connected with the optical input end of the third polarization controller, the optical output end of the first polarization controller and the second polarization controller is connected with the optical input end of the second optical coupler, the optical output end of the second phase modulator is connected with the optical input end of the first photoelectric detector, the optical output end of the first photoelectric detector is connected with the second photoelectric detector, and the optical output end of the second photoelectric detector is connected with the optical input end of the second photoelectric detector.
The single drive mach-zehnder modulator operates at a minimum transmission point to achieve carrier-reject modulation.
The radio frequency signal outputs of the second radio frequency signal source and the third radio frequency signal source should have equal power and be under large signal modulation, so that the modulation coefficients of the first phase modulator and the second phase modulator should meet m=1.4.
The output rf frequency of the second rf signal source and the third rf signal source should satisfy the following conditions: f L'＝9GHz,fL =10 GHz.
The optical band-pass filter reserves the upper sideband of the output spectrum of the single-drive Mach-Zehnder modulator, and the bandwidth of the optical band-pass filter meets the following conditions: b=40 GHz.
The response bandwidths of the first photodetector (15) and the second photodetector (16) should satisfy the following condition: b 1＝9GHz,B2 = 10GHz.
The specific working principle of the invention is as follows:
Under the condition of small signal modulation, a first radio frequency signal source sends out a signal to be detected to enter a single-drive Mach-Zehnder modulator for carrier suppression double-sideband modulation, and then a single sideband is reserved by an optical band pass filter to obtain an expression of
Where E 0 and f c represent the amplitude and frequency of the optical carrier, respectively, β 1＝πVn/Vπ is the modulation factor (where V π represents the half-wave voltage of the single drive mach-zehnder modulator), V n and f n represent the amplitude and frequency of the unknown microwave signal, and a n is the first-order sideband amplitude of the multi-frequency signal to be measured. The second and third radio frequency signal sources then enter the first and second phase modulators with modulation bandwidths of f L' =9 GHz and f L =10 GHz, respectively, under large signal modulation. The two radio frequency signals should be of equal power so that the modulation factor m=1.7 of the two phase modulators. The comb power generated is monotonically decreasing from the carrier frequency as the frequency increases. To this end, the non-flat OFC power fading produced by the first phase modulator and the second phase modulator are consistent, differing only in the channel spacing, the former being 9GHz and the latter being 10GHz. Taking the second phase modulator as an example, the output expression of the OFC of the output is:
Beta 2 is the modulation factor of the second phase modulator, J i (·) is the ith order of the first class of Bessel functions. It should be noted that we only use their carrier with the first fourth order sidebands and form four channels therefrom. The power ratio of the two sidebands to each other is the basis for distinguishing the sub-channels. The OFC and the output end of the optical band-pass filter are combined through a third optical coupler, and the obtained output is that:
The signal is fed to a second photodetector, also having a bandwidth of 10GHz, where the different frequency components are beaten. The photocurrent output of the second photodetector is:
Where the beat frequency component f n-(fc+ifL) is defined as f n-L,fc+(i+1)fL-fn, the sum of the frequencies of f n-R.fn-L and f n-R is f L, and the power ratio between them can be expressed as:
It is apparent that f n-L is more powerful. By utilizing the mathematical relationship, the unknown radio frequency can be judged to be positioned in which channel, and then the microwave signal frequency is obtained according to the initial channel frequency plus f n-L, so that the instantaneous measurement of the microwave signal frequency to be measured is realized.
The beneficial effects of the invention are as follows:
The invention combines the frequency power mapping method and the channelizing method, realizes the instantaneous measurement of multiple microwave frequencies by the microwave photonics method, does not need to establish an ACF function, is not constrained by the relation between the frequency range and the precision, can further enlarge the frequency of the frequency measurement by increasing the frequency of the local oscillator, and the measurement error only comes from the system noise. The beat signal power ratio is used for distinguishing the sub-channels, so that a large-scale filter, a wavelength division multiplexer and a photoelectric detector are avoided, and the complexity of the system is reduced.
Drawings
Fig. 1 is a schematic diagram of an instantaneous multi-frequency measurement system based on frequency power mapping and channelization.
Fig. 2 is a schematic diagram of four channels generated by a non-flat OFC.
Fig. 3 is a frequency measurement result corresponding to a single frequency signal according to an embodiment.
Fig. 4 shows the frequency measurement results corresponding to the two frequency signals in the second embodiment.
Fig. 5 shows the frequency measurement results corresponding to the three frequency signals in the embodiment.
Fig. 6 shows the frequency measurement results corresponding to the four frequency signals in the embodiment.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Embodiment one:
A transient multi-frequency measurement system based on frequency power mapping and channelization is shown in fig. 1, and comprises a continuous wave laser 1, a first optical coupler 2, a single-drive Mach-Zehnder modulator 3, a first phase modulator 4, a second phase modulator 5, a first radio frequency signal source 6, a second radio frequency signal source 7, a third radio frequency signal source 8, an optical band-pass filter 9, a first polarization controller 10, a second polarization controller 11, a third polarization controller 12, a second optical coupler 13, a third optical coupler 14, a first photoelectric detector 15, a second photoelectric detector 16, a first electric signal processing module 17 and a second electric signal processing module 18;
The concrete connection mode is as follows:
The optical output end of the continuous wave laser 1 is connected with the optical input end of the first optical coupler 2, the optical output end of the first optical coupler 2 is respectively connected with the optical input ends of the single-drive Mach-Zehnder modulator 3, the first phase modulator 4 and the second phase modulator 5, the output end of the first radio frequency signal source 6 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 3, the output end of the second radio frequency signal source 7 is connected with the radio frequency input end of the first phase modulator 4, the output end of the third radio frequency signal source 8 is connected with the radio frequency input end of the second phase modulator 5, the optical output end of the single-drive Mach-Zehnder modulator 3 is connected with the optical input end of the optical bandpass filter 9, the optical output end of the optical bandpass filter 9 is connected with the first polarization controller 10, the optical output end of the second phase modulator 5 is connected with the optical input end of the third polarization controller 12, the optical output end of the first polarization controller 10 and the second polarization controller 11 is connected with the optical output end of the second detector 13, the optical output end of the second detector 14 is connected with the optical output end of the second detector 14, and the optical detector 14 is connected with the optical output end of the second detector 14.
The single drive mach-zehnder modulator 3 operates at a minimum transmission point to achieve carrier-reject modulation.
The radio frequency signal outputs of the second radio frequency signal source 7 and the third radio frequency signal source 8 should have equal power and be under large signal modulation, so that the modulation coefficients of the first phase modulator 4 and the second phase modulator 5 should both satisfy m=1.4.
The output rf frequency of the second rf signal source 7 and the third rf signal source 8 should meet the following conditions: f L'＝9GHz,fL =10 GHz.
The optical bandpass filter 9 retains the upper sideband of the output spectrum of the single drive mach-zehnder modulator 3, the bandwidth of which should satisfy the following conditions: b=40 GHz.
The response bandwidths of the first photodetector 15 and the second photodetector 16 should satisfy the following condition: b 1＝9GHz,B2 = 10GHz.
After the above conditions are set, the first radio frequency signal source 6 outputs a single frequency microwave signal with the frequency f 1 =14.2 GHz, and a pair of beat signals with the frequency sum of 10GHz are obtained after the beat frequency of the second photoelectric detector, and f 1-L＝4.2GHz,f1-R =5.8 GHz is shown in fig. 3. The power ratio of a pair of beat signals was 8.37dB, and the channel profile of fig. 2 shows that the frequency belongs to the second channel, and the initial frequency is 10GHz. This gives a measurement value f 1＝10+f1-L =14.2 GHz.
Embodiment two:
A transient multi-frequency measurement system based on frequency power mapping and channelization is shown in fig. 1, and comprises a continuous wave laser 1, a first optical coupler 2, a single-drive Mach-Zehnder modulator 3, a first phase modulator 4, a second phase modulator 5, a first radio frequency signal source 6, a second radio frequency signal source 7, a third radio frequency signal source 8, an optical band-pass filter 9, a first polarization controller 10, a second polarization controller 11, a third polarization controller 12, a second optical coupler 13, a third optical coupler 14, a first photoelectric detector 15, a second photoelectric detector 16, a first electric signal processing module 17 and a second electric signal processing module 18;
The concrete connection mode is as follows:
The optical output end of the continuous wave laser 1 is connected with the optical input end of the first optical coupler 2, the optical output end of the first optical coupler 2 is respectively connected with the optical input ends of the single-drive Mach-Zehnder modulator 3, the first phase modulator 4 and the second phase modulator 5, the output end of the first radio frequency signal source 6 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 3, the output end of the second radio frequency signal source 7 is connected with the radio frequency input end of the first phase modulator 4, the output end of the third radio frequency signal source 8 is connected with the radio frequency input end of the second phase modulator 5, the optical output end of the single-drive Mach-Zehnder modulator 3 is connected with the optical input end of the optical bandpass filter 9, the optical output end of the optical bandpass filter 9 is connected with the first polarization controller 10, the optical output end of the second phase modulator 5 is connected with the optical input end of the third polarization controller 12, the optical output end of the first polarization controller 10 and the second polarization controller 11 is connected with the optical output end of the second detector 13, the optical output end of the second detector 14 is connected with the optical output end of the second detector 14, and the optical detector 14 is connected with the optical output end of the second detector 14.
The single drive mach-zehnder modulator 3 operates at a minimum transmission point to achieve carrier-reject modulation.
The radio frequency signal outputs of the second radio frequency signal source 7 and the third radio frequency signal source 8 should have equal power and be under large signal modulation, so that the modulation coefficients of the first phase modulator 4 and the second phase modulator 5 should both satisfy m=1.4.
The output rf frequency of the second rf signal source 7 and the third rf signal source 8 should meet the following conditions: f L'＝9GHz,fL =10 GHz.
The optical bandpass filter 9 retains the upper sideband of the output spectrum of the single drive mach-zehnder modulator 3, the bandwidth of which should satisfy the following conditions: b=40 GHz.
The response bandwidths of the first photodetector 15 and the second photodetector 16 should satisfy the following condition: b 1＝9GHz,B2 = 10GHz.
After the above conditions are set, the first radio frequency signal source 6 outputs a dual-frequency microwave signal, the frequencies f 1 =2.6 GHz and f 2 =16.7 GHz, and the beat frequency of the second photodetector obtains two pairs of beat frequency signals f 1-L＝2.6GHz,f1-R＝7.4GHz,f2-L＝6.7GHz,f2-R =3.3 GHz with the sum of 10GHz, as shown in fig. 4. The power ratio of the two pairs of beat signals is 0.43dB and 8.37dB, and the channel distribution diagram of FIG. 2 shows that the two frequencies respectively belong to a first channel and a second channel, and the initial frequencies are respectively 0GHz and 10GHz. This gives a measurement value f 1＝f1-L＝2.6GHz,f2＝10+f2-L =16.7 GHz.
Embodiment III:
A transient multi-frequency measurement system based on frequency power mapping and channelization is shown in fig. 1, and comprises a continuous wave laser 1, a first optical coupler 2, a single-drive Mach-Zehnder modulator 3, a first phase modulator 4, a second phase modulator 5, a first radio frequency signal source 6, a second radio frequency signal source 7, a third radio frequency signal source 8, an optical band-pass filter 9, a first polarization controller 10, a second polarization controller 11, a third polarization controller 12, a second optical coupler 13, a third optical coupler 14, a first photoelectric detector 15, a second photoelectric detector 16, a first electric signal processing module 17 and a second electric signal processing module 18;
The concrete connection mode is as follows:
The optical output end of the continuous wave laser 1 is connected with the optical input end of the first optical coupler 2, the optical output end of the first optical coupler 2 is respectively connected with the optical input ends of the single-drive Mach-Zehnder modulator 3, the first phase modulator 4 and the second phase modulator 5, the output end of the first radio frequency signal source 6 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 3, the output end of the second radio frequency signal source 7 is connected with the radio frequency input end of the first phase modulator 4, the output end of the third radio frequency signal source 8 is connected with the radio frequency input end of the second phase modulator 5, the optical output end of the single-drive Mach-Zehnder modulator 3 is connected with the optical input end of the optical bandpass filter 9, the optical output end of the optical bandpass filter 9 is connected with the first polarization controller 10, the optical output end of the second phase modulator 5 is connected with the optical input end of the third polarization controller 12, the optical output end of the first polarization controller 10 and the second polarization controller 11 is connected with the optical output end of the second detector 13, the optical output end of the second detector 14 is connected with the optical output end of the second detector 14, and the optical detector 14 is connected with the optical output end of the second detector 14.
The single drive mach-zehnder modulator 3 operates at a minimum transmission point to achieve carrier-reject modulation.
The radio frequency signal outputs of the second radio frequency signal source 7 and the third radio frequency signal source 8 should have equal power and be under large signal modulation, so that the modulation coefficients of the first phase modulator 4 and the second phase modulator 5 should both satisfy m=1.4.
The output rf frequency of the second rf signal source 7 and the third rf signal source 8 should meet the following conditions: f L'＝9GHz,fL =10 GHz.
The optical bandpass filter 9 retains the upper sideband of the output spectrum of the single drive mach-zehnder modulator 3, the bandwidth of which should satisfy the following conditions: b=40 GHz.
The response bandwidths of the first photodetector 15 and the second photodetector 16 should satisfy the following condition: b 1＝9GHz,B2 = 10GHz.
After the above conditions are set, the first radio frequency signal source 6 outputs a three-frequency microwave signal, the frequencies f 1＝5.4GHz, f2 =11.2 GHz and f 3 =27 GHz, and three pairs of beat signals f1-L＝5.4GHz,f1-R＝4.6GHz,f2-L＝1.2GHz,f2-R＝8.8GHz,f3-L＝7GHz, f3-R＝3GHz, with the frequency sum of 10GHz are obtained after the beat frequency of the second photodetector is shown in fig. 5. The power ratio of the three pairs of beat signals is 0.43dB,8.37dB and 12.30dB, and the channel distribution diagram of figure 2 shows that the two frequencies respectively belong to a first channel, a second channel and a third channel, and the initial frequencies are respectively 0GHz, 10GHz and 20GHz. This gives a measurement value f 1＝f1-L＝5.4GHz,f2＝10+f2-L＝11.2GHz,f3＝20+f3-L =27 GHz.
Embodiment four:
A transient multi-frequency measurement system based on frequency power mapping and channelization is shown in fig. 1, and comprises a continuous wave laser 1, a first optical coupler 2, a single-drive Mach-Zehnder modulator 3, a first phase modulator 4, a second phase modulator 5, a first radio frequency signal source 6, a second radio frequency signal source 7, a third radio frequency signal source 8, an optical band-pass filter 9, a first polarization controller 10, a second polarization controller 11, a third polarization controller 12, a second optical coupler 13, a third optical coupler 14, a first photoelectric detector 15, a second photoelectric detector 16, a first electric signal processing module 17 and a second electric signal processing module 18;
The concrete connection mode is as follows:
The optical output end of the continuous wave laser 1 is connected with the optical input end of the first optical coupler 2, the optical output end of the first optical coupler 2 is respectively connected with the optical input ends of the single-drive Mach-Zehnder modulator 3, the first phase modulator 4 and the second phase modulator 5, the output end of the first radio frequency signal source 6 is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator 3, the output end of the second radio frequency signal source 7 is connected with the radio frequency input end of the first phase modulator 4, the output end of the third radio frequency signal source 8 is connected with the radio frequency input end of the second phase modulator 5, the optical output end of the single-drive Mach-Zehnder modulator 3 is connected with the optical input end of the optical bandpass filter 9, the optical output end of the optical bandpass filter 9 is connected with the first polarization controller 10, the optical output end of the second phase modulator 5 is connected with the optical input end of the third polarization controller 12, the optical output end of the first polarization controller 10 and the second polarization controller 11 is connected with the optical output end of the second detector 13, the optical output end of the second detector 14 is connected with the optical output end of the second detector 14, and the optical detector 14 is connected with the optical output end of the second detector 14.
The single drive mach-zehnder modulator 3 operates at a minimum transmission point to achieve carrier-reject modulation.
The radio frequency signal outputs of the second radio frequency signal source 7 and the third radio frequency signal source 8 should have equal power and be under large signal modulation, so that the modulation coefficients of the first phase modulator 4 and the second phase modulator 5 should both satisfy m=1.4.
The output rf frequency of the second rf signal source 7 and the third rf signal source 8 should meet the following conditions: f L'＝9GHz,fL =10 GHz.
The optical bandpass filter 9 retains the upper sideband of the output spectrum of the single drive mach-zehnder modulator 3, the bandwidth of which should satisfy the following conditions: b=40 GHz.
The response bandwidths of the first photodetector 15 and the second photodetector 16 should satisfy the following condition: b 1＝9GHz,B2 = 10GHz.
After the above conditions are set, the first radio frequency signal source 6 outputs four-frequency microwave signals with frequencies f 1＝3.7GHz,f2＝14GHz,f3 =26.5 GHz and f 4 =32 GHz, and four pairs of beat signals f1-L＝3.7GHz,f1-R＝6.3GHz,f2-L＝4GHz,f2-R＝6GHz,f3-L＝6.5GHz,f3-R＝3.5GHz,f4-L＝2GHz,f4-R＝8GHz, with frequencies of 10GHz are obtained after the beat frequency of the second photodetector is shown in fig. 6. The power ratio of the four pairs of beat signals is 0.43dB,8.37dB,12.30dB and 14.93dB, and the channel distribution diagram of figure 2 shows that the two frequencies respectively belong to a first channel, a second channel, a third channel and a fourth channel, and the initial frequencies are respectively 0, 10GHz,20GHz and 30GHz. From which a measurement is obtained f1＝f1-L＝3.7GHz,f2＝10+f2-L＝14GHz, f3＝20+f3-L＝26.5GHz,f4＝30+f4-L＝32GHz.
Claims (6)
1. An instantaneous multi-frequency measurement system based on frequency power mapping and channelization, characterized in that: the measuring system comprises a continuous wave laser (1), a first optical coupler (2), a single-drive Mach-Zehnder modulator (3), a first phase modulator (4), a second phase modulator (5), a first radio frequency signal source (6), a second radio frequency signal source (7), a third radio frequency signal source (8), an optical band pass filter (9), a first polarization controller (10), a second polarization controller (11), a third polarization controller (12), a second optical coupler (13), a third optical coupler (14), a first photoelectric detector (15), a second photoelectric detector (16), a first electric signal processing module (17) and a second electric signal processing module (18); the concrete connection mode is as follows:
the optical output end of the continuous wave laser (1) is connected with the optical input end of the first optical coupler (2), the optical output end of the first optical coupler (2) is respectively connected with the optical input ends of the single-drive Mach-Zehnder modulator (3), the first phase modulator (4) and the second phase modulator (5), the output end of the first radio frequency signal source (6) is connected with the radio frequency input end of the single-drive Mach-Zehnder modulator (3), the output end of the second radio frequency signal source (7) is connected with the radio frequency input end of the first phase modulator (4), the output end of the third radio frequency signal source (8) is connected with the radio frequency input end of the second phase modulator (5), the optical output end of the single-drive Mach-Zehnder modulator (3) is connected with the optical input end of the optical band pass filter (9), the optical output end of the optical band pass filter (9) is connected with the first polarization controller (10), the optical output end of the first phase modulator (4) is connected with the optical input end of the second polarization controller (11), the optical output end of the third phase modulator (5) is connected with the optical input end of the second polarization controller (13), the electric output end of the first photoelectric detector (15) is connected with the electric input end of the first electric signal processing module (17), the optical output ends of the first polarization controller (10) and the third polarization controller (12) are connected with the optical input end of the third optical coupler (14), the optical output end of the third optical coupler (14) is connected with the optical input end of the second photoelectric detector (16), and the electric output end of the second photoelectric detector (16) is connected with the electric input end of the second electric signal processing module (18).
2. A frequency power mapping and channelization based instantaneous multi-frequency measurement system as claimed in claim 1, characterized in that: the single drive Mach-Zehnder modulator (3) operates at a minimum transmission point to achieve carrier-reject modulation.
3. A frequency power mapping and channelization based instantaneous multi-frequency measurement system as claimed in claim 1, characterized in that: the radio frequency signal outputs of the second radio frequency signal source (7) and the third radio frequency signal source (8) should have equal power and be under large signal modulation, so that the modulation coefficients of the first phase modulator (4) and the second phase modulator (5) should both satisfy m=1.4.
4. A frequency power mapping and channelization based instantaneous multi-frequency measurement system as claimed in claim 1, characterized in that: the output radio frequency of the second radio frequency signal source (7) and the third radio frequency signal source (8) should fulfil the following conditions: f L'＝9GHz,fL =10 GHz.
5. A frequency power mapping and channelization based instantaneous multi-frequency measurement system as claimed in claim 1, characterized in that: the optical band-pass filter (9) reserves the upper sideband of the output spectrum of the single-drive Mach-Zehnder modulator (3), and the bandwidth of the optical band-pass filter meets the following conditions: b=40 GHz.
6. A frequency power mapping and channelization based instantaneous multi-frequency measurement system as claimed in claim 1, characterized in that: the response bandwidths of the first photodetector (15) and the second photodetector (16) should satisfy the following condition: b 1＝9GHz,B2 = 10GHz.
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