CN102636694B - Single-response microwave photonic filter-based frequency measurement device and measurement method - Google Patents
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Abstract
The invention discloses a single-response microwave photonic filter-based frequency measurement device and a measurement method, and relates to a frequency measurement device and method. The frequency measurement device is provided with a broadband light source, a Mach-Zehnder fiber optic interferometer, an electro-optical modulator, an optical fiber amplifier, a microwave antenna, a dispersion optical fiber, a photo detector and an electrodynamic meter. A tunable single-response microwave photonic filter can be realized by using a structure based on combined Mach-Zehnder fiber optic interferometer spectral division and dispersion optical fiber; the transmission peak frequency position of the single-response microwave photonic filter is adjusted by scanning an adjustable delay line of the optical fiber; and the detection of the frequency of a measured microwave signal is realized by restoring measurement of electric signal power through the photo detector. The microwave electronic filter has an incoherent filter structure; and meanwhile, the detection of a multi-frequency microwave signal is realized through quick length scanning of the adjustable delay line. Remote high-frequency microwave signal frequency measurement of electromagnetic interference can be realized.
Description
Technical field
The present invention relates to a kind of frequency measuring equipment and method, especially relate to a kind of frequency measuring equipment and measuring method based on single response microwave photon filter.
Background technology
Microwave frequency measurement is one of gordian technique of microwave detection, in following radar communications system electronic interferences and counter-jamming, has very important application, and the method tool that development high-frequency microwave signal and multi-frequency microwave signal frequency are measured is of great significance.
Adopt the restriction that microwave frequency that electrical method is realized is measured due to its " electronic bottleneck " to be difficult to realize high-frequency signal frequency measurement, and there is complex structure, volume is large, weight is large, easily by shortcomings such as enemy's electromagnetic interference (EMI).Adopt optical means to carry out microwave signal frequency detection, have the large bandwidth of optical device, low-loss, volume is little, lightweight and the advantage such as anti-electromagnetic interference (EMI).
Chinese patent CN101567723 discloses a kind of microwave frequency measuring method and device thereof detecting based on luminous power, adopts the system being comprised of electrooptical modulation module and frequency demodulation module to measure in real time microwave frequency.Continuous microwave signal is loaded on the continuous light source in modulation module in carrier wave inhibition type small signal modulation mode, only generates two, ± 1 rank optical sideband; Modulated light signal is divided into two-way ，Yi road and is injected into the comb filter with sine function shape transmission spectrum; Another road is injected into variable optical attenuator; After testing and contrast the Output optical power of described two branch roads, from power ratio, demodulation obtains microwave frequency.This invention has reduced complexity and the cost of system, and has eliminated the impact of the fluctuation of light source output power on frequency measurement, has expanded the measurement frequency range of frequency linearity demodulation.
Chinese patent CN101893657A discloses a kind of frequency measuring equipment of short gating time counting method of absolute frequency that can high-acruracy survey measured signal.Comprise measure measured signal export the high-order high-order calculating part of the frequency values that should detect, measure measured signal and export the frequency values that should detect low level low level calculating part and be added the output of high-order output and low level and export the adder of the frequency measurement of measured signal; The frequency counter portion that high-order calculating part comprises the frequency approximate number of measuring the measured signal unit interval, from the count value of this frequency counter, remove and be equivalent to the count value part of low level and as the compensation calculating part of high-order output, low level calculating part is included in the short gating time counter portion of the frequency of the time interval inside counting measured signal shorter than the unit interval, using the count value string of this short gating time counter as the low-pass filter portion of input with using the output valve of this low-pass filter portion, be scaled the value of unit interval and the calibration portion that exports as low level.
Summary of the invention
The object of the invention is to the deficiency of carrying out microwave frequency measurement for existing electrical method and optical means, a kind of frequency measuring equipment and measuring method based on single response microwave photon filter that realizes multi-frequency micro-wave signal is provided.
The described frequency measuring equipment based on single response microwave photon filter is provided with wideband light source, Mach-Zehnder optical fiber interferometer, electrooptic modulator, fiber amplifier, microwave antenna, dispersive optical fiber, photodetector and electrodymamometer, described wideband light source is connected with the input port of Mach-Zehnder optical fiber interferometer, the output port of Mach-Zehnder optical fiber interferometer is connected with the input port of electrooptic modulator, the output port of electrooptic modulator is connected with the input port of fiber amplifier, the electric drive port of electrooptic modulator is electrically connected to microwave antenna, the output port of fiber amplifier is connected with one end of dispersive optical fiber, the other end of dispersive optical fiber is connected with the input end light of photodetector, and the output port of photodetector is electrically connected to the input port of electrodymamometer, described Mach-Zehnder optical fiber interferometer is provided with two 3dB, tetra-fiber port coupling mechanism and fiber adjustable delay lines, an output port of the 1st 3dB tetra-fiber port coupling mechanisms is connected with an input port of the 2nd 3dB tetra-fiber port coupling mechanisms, another output port of the 1st 3dB tetra-fiber port coupling mechanisms is connected with another input port of the 2nd 3dB tetra-fiber port coupling mechanisms by fiber adjustable delay line, an input port of the 1st 3dB tetra-fiber port coupling mechanisms is as the input port of Mach-Zehnder optical fiber interferometer, an output port of the 2nd 3dB tetra-fiber port coupling mechanisms is as the output port of Mach-Zehnder optical fiber interferometer.
The described frequency measurement method based on single response microwave photon filter, adopts the described frequency measuring equipment based on single response microwave photon filter, said method comprising the steps of:
1) open wideband light source, the light of wideband light source transmitting carries out spectrum through Mach-Zehnder optical fiber interferometer to be cut apart, formation comb filtering spectrum, an input port of the 1st 3dB tetra-fiber port coupling mechanisms is connected with wideband light source as the input end of Mach-Zehnder optical fiber interferometer, and an output port of the 2nd 3dB tetra-fiber port coupling mechanisms is as the output port of Mach-Zehnder optical fiber interferometer;
2) the measured microwave signal that the multi-wavelength pectination spectrum of the output port outgoing of Mach-Zehnder optical fiber interferometer is received by microwave antenna through electrooptic modulator (EOM) is modulated, and in the fiber amplifier of going forward side by side, amplifies;
3) modulation signal after amplifying enters that a bundle dispersive optical fiber is sampled, time delays, and enters photodetector and recovers to obtain electric signal;
4) length of scanning fiber adjustable delay line, by electrodymamometer, measure the power that recovers electric signal, the length of fiber adjustable delay line while obtaining power maximal value, according to corresponding relation, obtain the frequency of microwave signal, change the wavelength interval of Mach-Zehnder optical fiber interferometer interference spectrum, can regulate the centre frequency of single response microwave photon filter; When centre frequency equates with surveyed microwave signal frequency, on photodetector, obtain the output of maximum electric power, Mach-Zehnder optical fiber interferometer two arm lengths pass poor and that surveyed between microwave signal frequency is,
f
c＝nΔL/Dλ
2
Wherein n is optical fibre refractivity, Δ L is that Mach-Zehnder optical fiber interferometer two arm lengths are poor, D is the time delay between unit wavelength, wavelength centered by λ, when the output power that obtains on electrodymamometer is maximum, record the now length of fiber adjustable delay line, can try to achieve according to above-mentioned formula the frequency of surveyed microwave signal.
The present invention adopts cuts apart based on Mach-Zehnder optical fiber interferometer spectrum the structure combining with dispersive optical fiber, realizes tunable single response microwave photon filter; Scanning fiber adjustable delay line regulates the transmission peaks frequency location of this list response microwave photon filter, and the measurement that recovers electric signal power by photodetector realizes the detection to the frequency of tested microwave signal.This microwave photon filter adopts incoherent filter construction design, and environmental interference is insensitive to external world; By adjustable delay line length fast, scan to realize the detection for multi-frequency micro-wave signal simultaneously.The method can realize the remote high-frequency microwave signal frequency measurement of anti-electromagnetic interference (EMI), than other traditional measurement schemes, be with roomy, anti-electromagnetic interference (EMI), be suitable for the outstanding advantages such as telemeasurement and low-loss, greatly reduce cost and the complexity of measurement.
The present invention adopts Mach-Zehnder interferometer to carry out spectrum to cut apart, in conjunction with dispersive optical fiber, realize single response microwave photon filter, by to the poor scanning that regulates to realize single response filtering transmission peaks of Mach-Zehnder interferometer two arm lengths, when filter transmission peak is scanned up to measured microwave signal frequency place, output power obtains maximal value, thereby records microwave signal frequency.The frequency measurement that realizes microwave signal with single response microwave photon filter of dispersive medium is cut apart in utilization of the present invention based on Mach-Zehnder optical fiber interferometer spectrum.The present invention is applicable to anti-electromagnetic interference (EMI) and the telemeasurement of microwave signal frequency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
Embodiment
As shown in Figure 1, the described frequency measuring equipment embodiment based on single response microwave photon filter is provided with wideband light source 1, Mach-Zehnder optical fiber interferometer, electrooptic modulator 5, fiber amplifier 7, microwave antenna 6, dispersive optical fiber 8, photodetector 9 and electrodymamometer 10.Described wideband light source 1 is connected with the input port of Mach-Zehnder optical fiber interferometer, the output port of Mach-Zehnder optical fiber interferometer is connected with the input port of electrooptic modulator 5, the output port of electrooptic modulator 5 is connected with the input port of fiber amplifier 7, the electric drive port of electrooptic modulator 5 is electrically connected to microwave antenna 6, the output port of fiber amplifier 7 is connected with one end of dispersive optical fiber 8, the other end of dispersive optical fiber 8 is connected with the input end light of photodetector 9, and the output port of photodetector 9 is electrically connected to the input port of electrodymamometer 10.Described Mach-Zehnder optical fiber interferometer is provided with the 1st 3dB tetra-fiber port coupling mechanisms 2, the 2nd 3dB tetra-fiber port coupling mechanism 4 and fiber adjustable delay line 3, an output port of the 1st 3dB tetra-fiber port coupling mechanisms 2 is connected with an input port of the 2nd 3dB tetra-fiber port coupling mechanisms 4, another output port of the 1st 3dB tetra-fiber port coupling mechanisms 2 is connected with another input port of the 2nd 3dB tetra-fiber port coupling mechanisms 4 by fiber adjustable delay line 3, an input port of the 1st 3dB tetra-fiber port coupling mechanisms 2 is as the input port of Mach-Zehnder optical fiber interferometer, an output port of the 2nd 3dB tetra-fiber port coupling mechanisms 4 is as the output port of Mach-Zehnder optical fiber interferometer.
Below provide the concrete steps of the frequency measurement method based on single response microwave photon filter:
Wideband light source carries out spectrum through Mach-Zehnder optical fiber interferometer to be cut apart.Mach-Zehnder optical fiber interferometer consists of two 3dB, tetra-fiber port coupling mechanisms, an output port of the 1st 3dB tetra-fiber port coupling mechanisms is connected with an input port of the 2nd 3dB tetra-fiber port coupling mechanisms, another output port of the 1st 3dB tetra-fiber port coupling mechanisms connects fiber adjustable delay line, then is connected to form Mach-Zehnder optical fiber interferometer with another input port of the 2nd 3dB tetra-fiber port coupling mechanisms.An input port of the 1st 3dB tetra-fiber port coupling mechanisms is connected with wideband light source as the input end of Mach-Zehnder optical fiber interferometer, and an output port of the 2nd 3dB tetra-fiber port coupling mechanisms is as the output port of Mach-Zehnder optical fiber interferometer.
The multi-wavelength of the output port of Mach-Zehnder optical fiber interferometer is cut apart spectrum and is modulated through the measured microwave signal that received by microwave antenna of electrooptic modulator (EOM), in the fiber amplifier of going forward side by side, amplifies.
Modulation signal after amplification enters that a bundle dispersive optical fiber is sampled, time delays, and enters photodetector and recovers to obtain electric signal.
By the length of scanning fiber adjustable delay line, the wavelength interval of Mach-Zehnder optical fiber interferometer interference spectrum, thus regulate single centre frequency that responds microwave photon filter; When its centre frequency equates with surveyed microwave signal frequency, on photodetector, obtain the output of maximum electric power.Mach-Zehnder optical fiber interferometer two arm lengths pass poor and that surveyed between microwave signal frequency is,
f
c＝nΔL/Dλ
2
Wherein n is optical fibre refractivity, and Δ L is that Mach-Zehnder optical fiber interferometer two arm lengths are poor, and D is the time delay between unit wavelength, wavelength centered by λ.When the output power that obtains is maximum, record the now length of fiber adjustable delay line on photodetector, can try to achieve according to above-mentioned formula the frequency of surveyed microwave signal.
Claims (2)
1. the frequency measuring equipment based on single response microwave photon filter, is characterized in that being provided with wideband light source, Mach-Zehnder optical fiber interferometer, electrooptic modulator, fiber amplifier, microwave antenna, dispersive optical fiber, photodetector and electrodymamometer, described wideband light source is connected with the input port of Mach-Zehnder optical fiber interferometer, the output port of Mach-Zehnder optical fiber interferometer is connected with the input port of electrooptic modulator, the output port of electrooptic modulator is connected with the input port of fiber amplifier, the electric drive port of electrooptic modulator is electrically connected to microwave antenna, the output port of fiber amplifier is connected with one end of dispersive optical fiber, the other end of dispersive optical fiber is connected with the input end light of photodetector, and the output port of photodetector is electrically connected to the input port of electrodymamometer, described Mach-Zehnder optical fiber interferometer is provided with two 3dB, tetra-fiber port coupling mechanism and fiber adjustable delay lines, an output port of the 1st 3dB tetra-fiber port coupling mechanisms is connected with an input port of the 2nd 3dB tetra-fiber port coupling mechanisms, another output port of the 1st 3dB tetra-fiber port coupling mechanisms is connected with another input port of the 2nd 3dB tetra-fiber port coupling mechanisms by fiber adjustable delay line, an input port of the 1st 3dB tetra-fiber port coupling mechanisms is as the input port of Mach-Zehnder optical fiber interferometer, an output port of the 2nd 3dB tetra-fiber port coupling mechanisms is as the output port of Mach-Zehnder optical fiber interferometer.
2. the frequency measurement method based on single response microwave photon filter, is characterized in that, adopts the frequency measuring equipment based on single response microwave photon filter as claimed in claim 1, said method comprising the steps of:
1) open wideband light source, the light of wideband light source transmitting carries out spectrum through Mach-Zehnder optical fiber interferometer to be cut apart, formation comb filtering spectrum, an input port of the 1st 3dB tetra-fiber port coupling mechanisms is connected with wideband light source as the input end of Mach-Zehnder optical fiber interferometer, and an output port of the 2nd 3dB tetra-fiber port coupling mechanisms is as the output port of Mach-Zehnder optical fiber interferometer;
2) the measured microwave signal that the multi-wavelength pectination spectrum of the output port outgoing of Mach-Zehnder optical fiber interferometer is received by microwave antenna through electrooptic modulator is modulated, and in the fiber amplifier of going forward side by side, amplifies;
3) modulation signal after amplifying enters that a bundle dispersive optical fiber is sampled, time delays, and enters photodetector and recovers to obtain electric signal;
4) length of scanning fiber adjustable delay line, by electrodymamometer, measure the power that recovers electric signal, the length of fiber adjustable delay line while obtaining power maximal value, according to corresponding relation, obtain the frequency of microwave signal, change the wavelength interval of Mach-Zehnder optical fiber interferometer interference spectrum, regulate the centre frequency of single response microwave photon filter; When centre frequency equates with surveyed microwave signal frequency, on photodetector, obtain the output of maximum electric power, Mach-Zehnder optical fiber interferometer two arm lengths pass poor and that surveyed between microwave signal frequency is:
f
c＝nΔL/(Dλ
2)
Wherein n is optical fibre refractivity, Δ L is that Mach-Zehnder optical fiber interferometer two arm lengths are poor, D is the time delay between unit wavelength, wavelength centered by λ, when the output power that obtains on electrodymamometer is maximum, record the now length of fiber adjustable delay line, can try to achieve according to above-mentioned formula the frequency of surveyed microwave signal.
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