CN106053938A - Apparatus and method for realizing instantaneous microwave frequency measurement by dual polarization modulators - Google Patents

Apparatus and method for realizing instantaneous microwave frequency measurement by dual polarization modulators Download PDF

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CN106053938A
CN106053938A CN201610473365.5A CN201610473365A CN106053938A CN 106053938 A CN106053938 A CN 106053938A CN 201610473365 A CN201610473365 A CN 201610473365A CN 106053938 A CN106053938 A CN 106053938A
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signal
polarization
frequency
microwave
power
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CN106053938B (en
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李晓艳
文爱军
陈玮
高永胜
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Xidian Univ
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Xidian Univ
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage

Abstract

The invention discloses an apparatus and method for realizing instantaneous microwave frequency measurement by dual polarization modulators. The invention relates to the technical fields of microwave and optical communication, and is mainly used for the measurement of microwave signal frequency. The method, as shown in the drawing, includes a light source, a signal source, the dual polarization modulators, a single-mode fiber, a coupler, a polarization controller, a polarizer, and a photoelectric detector, and the microwave signals of the unknown frequency generated by the signal source are modulated by the dual polarization modulators to obtain polarization multiplexing signals. Through the fiber dispersion, the polarization multiplexing signals are divided into two paths, one is maintained at the same polarization state, the other one is converted into a linear polarization signal through the polarization controller and the polarizer. The photoelectric detector detects the two signals, measures the power values and establishes the power comparison functions. According to the correspondence relation, the measured frequency can be estimated. By changing the polarization state of one signal, the measurement scope can be adjusted, the realization is simple, the resolution is high, and the measurement error is less.

Description

Dual-polarization manipulator is utilized to realize the device and method that transient microwave frequency is measured
Technical field
The present invention relates to technical field of photo communication and microwave technical field, relate generally in optical communication technique based on dual-polarization Manipulator (DPol-MZM) realizes the method that transient microwave frequency is measured
Background technology
In electronic warfare and radar system, from the microwave signal that receiver is intercepted and captured, extract frequency, amplitude etc. in time various Characteristic parameter is most important.But, along with coming into operation of millimere-wave band (0.4-40GHz) signal, traditional electronic receiver Limited in bandwidth, and its structure is complicated, and bulky, easily by bottleneck problems such as electromagnetic interference, urgent need to provide a kind of new Solution.
Microwave photon technology has the advantage of photon technology and microwave technology concurrently, can make up the deficiency of electronic device, for wink Time frequency measurement provide a big bandwidth, low-loss, jamproof solution.
Microwave photon technology carries out the method for frequency measurement and mainly includes three kinds: map based on frequency-amplitude;Based on frequency Rate-time map;Map based on frequency-space.Wherein frequency-amplitude i.e. frequency-power maps, owing to system structure is simple, Frequency measurement scope is big, certainty of measurement is high and becomes research emphasis.The principle of the method is microwave signal to be measured to be modulated light carry On ripple, through certain light channel structure, obtain only relevant with microwave frequency to be measured power ratio function (amplitude comparison function, ACF).By microwave frequency and the one-to-one relationship of power ratio function, microwave frequency to be measured can be calculated.
At present, the frequency measurement technology of the method mapped based on frequency-power mainly utilizes intensity modulator, phase-modulation Device or light polarization modulator, modulated signal obtains different power response curves through different dispersive mediums, thus sets up merit Rate compares value function.
Summary of the invention
In order to solve the problem in the presence of background technology, the present invention proposes one and utilizes DPol-MZM to realize Microwave Frequency The method that rate is measured.The method has that simple in construction, measurement scope be big and scalable, frequency-measurement accuracy advantages of higher.
The technical solution adopted for the present invention to solve the technical problems is: described device includes light source, signal source, dual-polarization Manipulator, bonder, the polarizer, Polarization Controller, single-mode fiber and photodetector, wherein DPol-MZM is parallel by two Mach to increase the polarization beam apparatus of Dare manipulator MZM1 and MZM2 and afterbody integrated;The outfan of light source is modulated with dual-polarization Device light input end is connected;The outfan of signal source is connected with MZM1 rf inputs, and other prevention at radio-frequency port is unloaded;Double partially The outfan of manipulator of shaking is connected with single-mode fiber one end;The other end of single-mode fiber is connected with coupler input;Bonder An outfan be connected with photodetector 1 input port;Another outfan of bonder and one end phase of Polarization Controller Even;The other end of Polarization Controller is connected with the input port of the polarizer;The outfan of the polarizer and the input of photodetector 2 Port is connected;Photodetector 1 and photodetector 2 export two path signal.
The present invention operationally comprises the following steps:
(1) light wave that wavelength is λ is sent as carrier signal injection to DPol-MZM from laser instrument;
(2) in DPol-MZM, light carrier is divided into two-way, is separately input in MZM1 and MZM2, and signal source produces unknown frequency The microwave signal of rate is input to a rf inputs mouth of MZM1, other prevention at radio-frequency port no signal.It is V by amplitudeDC1Direct current Voltage is linked into the direct-flow input end of MZM1, is V by amplitudeDC2DC voltage be linked into the direct-flow input end of MZM2.
(3) V is setDC1、VDC2Size, make MZM1 and MZM2 be operated in maximum transmitted point.Outfan at MZM1 obtains being treated Surveying optical signal and the light carrier of microwave signal phase modulation, light carrier had to by the outfan at MZM2;
(4) two paths of signals of MZM1 and MZM2 output is input to polarization beam apparatus and realizes polarization state orthogonalization, DPol-MZM's Outfan obtains polarisation-multiplexed signal;
(5) output signal of DPol-MZM is linked into bonder after a section single-mould fiber, and signal is divided into two-way by bonder;
(6) signal is directly accessed photodetector 1 by upper road, and the polarisation-multiplexed signal of input is detected by photodetector 1;
(7) under, signal is linked into photodetector 2 after Polarization Controller and the polarizer by road.Polarization Controller and the polarizer Realizing the conversion to line polarized light signal of the palarization multiplexing optical signal, the outfan at the polarizer obtains line polarized light signal.Photoelectricity The line polarized light signal of input is detected by detector 2;
(8) measurement photodetector 1 and photodetector 2 export the power of the signal of telecommunication.By upper and lower rood to performance number carry out Ratio calculation, according to power comparison function and the one-to-one relationship treating Microwave Frequency Measurement rate, can calculate microwave frequency to be measured;
(9) change the power of the unknown microwave signal that signal source produces, repeat step 8;
(10) regulation lower road Polarization Controller changes the angle between the main shaft of the polarizer and dual-polarization manipulator, repeats step 8, it is achieved the tuning of frequency measurement scope;
The present invention proposes a kind of novel microwave frequency measuring method, and the program utilizes DPol-MZM and one section of single-mode optics Fine, it is achieved the mapping of microwave frequency to power, obtain ACF.In order to avoid the ambiguity of frequency measurement, choose from zero-frequency to The monotony interval of first trap wave point position of ACF curve is as frequency measurement scope.According to microwave frequency to be measured and power ratio The one-to-one relationship of value, it is achieved the measurement of microwave frequency.Present device is simple, has the strongest actual operability.
Owing to Shang Lu and lower rood are to having the power fading curve of near-complementary, the slope of ACF is precipitous, Measurement Resolution High.
The maximum magnitude of frequency measurement depends on the position of first trap wave point in Shang Lu and lower road power fading curve. Owing to upper road is fixed non-adjustable, regulation lower road Polarization Controller, the position of first trap wave point of lower road power fading curve with Change, it is achieved measure scope change.
Fig. 1 is that the present invention utilizes DPol-MZM to realize the schematic diagram that microwave frequency is measured, and Fig. 2 is to use a length of 5km Single-mode fiber experimental result picture, wherein:
A one group of ACF curve chart that () obtains for different θ;
B () is that to measure scope be that 2-28GHz, Shang Lu, lower road power curve and actual ACF, theoretical ACF scheme to selecting frequency;
(c) be selecting frequency measure scope be 2-28GHz, microwave signal power for-3dBm time, measurement error figure;
(d) be selecting frequency measure scope be 2-28GHz, microwave signal power for-20dBm time, measurement error figure;
Detailed description of the invention:
Below in conjunction with the accompanying drawings embodiments of the invention are elaborated: the present embodiment is being front with technical solution of the present invention Put and implement, give detailed embodiment and concrete operating process, but under protection scope of the present invention is not limited to The embodiment belonged to:
Fig. 1 is that the present invention utilizes DPol-MZM to realize the schematic diagram that microwave frequency is measured.Wherein DPol-MZM is for letter The microwave signal that the frequency that number source produces is unknown is modulated, and produces polarisation-multiplexed signal, and the single-mode fiber through 5km introduces color After Saning, a road is directly accessed photodetector detection, leads up to Polarization Controller and after the polarizer is converted into linear polarization signal, Access photodetector to detect.Upper and lower two-way is obtained performance number compare, obtain ACF function, according to corresponding relation Calculate and treat measured frequency.
As it is shown in figure 1, in the present embodiment, device includes: light source, DPol-MZM, signal source, single-mode fiber, bonder, rise Device, Polarization Controller, photodetector partially, wherein dual-polarization manipulator is made up of the polarization beam apparatus of MZM1, MZM2 and afterbody. The outfan of light source is connected with the input of dual-polarization manipulator;The outfan of signal source and MZM1 rf inputs phase Even;The single-mode fiber of the outfan of dual-polarization manipulator and one section of 5km is connected, the other end of optical fiber and the input phase of bonder Even;One output port of bonder is connected with photodetector 1, and another delivery outlet is followed by through Polarization Controller and the polarizer Enter photodetector 2;Measurement photodetector 1 and photodetector 2 export the power of the signal of telecommunication.The power that upper and lower rood is arrived Value carries out ratio calculation, according to power comparison function and the one-to-one relationship treating Microwave Frequency Measurement rate, can estimate microwave to be measured Frequency.
In this example, concrete microwave frequency measuring method and principle comprise the following steps:
Step one: it is 1552nm that light source produces operation wavelength, and power is the continuous light wave of 11dBm, wherein by the operating angle of light wave Frequency is designated as ωc, amplitude is designated as E0, continuous light wave is input to DPol-MZM.
Step 2: the microwave signal of frequency the unknown signal source produced is input to a rf inputs of MZM1, and other is penetrated Frequently port is not loaded with signal, MZM1 and MZM2 is all biased in maximum transmitted point.The signal packet of MZM1 output is containing by measured signal phase The optical signal of position modulation and part light carrier.When measured signal is less, higher order term can be ignored, only retain single order composition.Permissible It is expressed as following formula:
1 2 E 0 exp ( jω c t ) [ J 0 ( m ) + J 1 ( m ) exp ( j Ω t ) - J 1 ( m ) exp ( - j Ω t ) + exp ( j 0 ) ]
Wherein Ω=2 π fs, fsFor treating measured frequency, m is modulation index, Jn() is first kind n rank Bessel functions.MZM2's is defeated Go out signal and only comprise light carrier, can be expressed as following formula:
1 2 E 0 exp ( jω c t )
The output signal of MZM1 and MZM2 enters polarization beam apparatus and realizes polarization state orthogonalization, and the output optical signal of DPol-MZM can It is expressed as:
E X E Y = 1 2 E 0 exp ( jω c t ) J 0 ( m ) + J 1 ( m ) exp ( j Ω t ) - J 1 ( m ) exp ( - j Ω t ) + 1 1
Step 3: be 5km by length L by the output signal of DPol-MZM, abbe number D is 17 × 10-6s/m2Single-mode optics Fine introducing dispersion measureThe signal of output is represented by:
Whereinβ2=-λ2D/2πc;
Step 4: be divided into two-way, upper road signal to be directly accessed photodetector 1 and examine through bonder the signal that optical fiber exports Surveying, 1 output signal of photoelectric detector is represented by:
Wherein ξ is the responsiveness of photodetector.Lower road signal is after Polarization Controller and the polarizer, and polarisation-multiplexed signal turns Turning to linear polarization signal, polarizer output signal is expressed as:
E p o l ( t ) = 1 2 [ E X c o s α + E Y s i n α exp ( j θ ) ]
Wherein α is polarization beam apparatus main shaft and the angle of polarizer main shaft, and arranging it in example is 75 °, and θ is that Polarization Controller draws The additional phase shift entered.The output signal of the polarizer accesses photodetector 2, and the output signal of photoelectric detector 2 is represented by:
Step 5: the signal of telecommunication that photodetector 1 and photodetector 2 obtain is carried out power measurement and carries out ratio calculation, Obtain the ACF curve with frequency dependence, can be expressed as following formula:
A C F = i 2 2 ( t ) i 1 2 ( t ) = cos 4 α [ 1 + t a n α s i n ( β 2 Ω 2 L 2 - θ ) ( J 0 ( m ) + 1 ) sin β 2 Ω 2 L 2 ] 2
In order to avoid the ambiguity of frequency measurement, on ACF curve, choose from zero-frequency to the position conduct of first trap wave point Frequency measurement scope.
Step 6: in example, wide-measuring range depend on upper and lower rood to power curve in first trap occurs at first The position of point.Upper rood to power curve be fixing, lower road by regulation Polarization Controller change angle, θ, it is achieved under The movement of first trap wave point position of road power curve, thus realize the tunable of frequency measurement scope.When-180 °≤θ≤0 °, First trap wave point f of lower road power curvemaxPosition be represented by:
f m a x = cot - 1 [ cot θ + J 0 ( m ) + 1 sin θ t a n α ] 2 β 2 π 2 L
Step 7: the power changing the microwave signal that signal source produces is-20dB, repeats step 5.
Fig. 2 (a) is that the one group of power obtained under different angles θ compares curve chart.As can be seen from Figure, it is-0.27 as θ π ,-0.4 π ,-0.57 π, during-0.72 π, measurement scope is respectively 0-16GHz, 0-20GHz, 0-24GHz, 0-28GHz.By partially When the controller that shakes changes angle, θ, it is possible to achieve frequency measurement scope tunable.Fig. 2 (b) be selecting frequency measure scope be 2- During 28GHz, Shang Lu, lower road power curve and actual ACF and theoretical ACF figure.It can be seen that the power curve that rood arrives up and down Near-complementary, so it is big to obtain the ACF slope of curve, certainty of measurement is the highest.Simultaneously it can be seen that the ACF curve actually obtained and reason The ACF curve approximation of opinion coincide.Fig. 2 (c) be selecting frequency measure scope be 2-28GHz, microwave signal power for-3dBm time, Frequency measurement Error Graph.It can be seen that measurement error is at ± 0.3GHz.Fig. 2 (d) be selecting frequency measure scope be 2- 28GHz, microwave signal power are-20dBm, measurement error figure.Compared with being measurement error during-3dB with microwave signal power, can To see that error change is inconspicuous, the power of frequency measurement and microwave signal is unrelated.
To sum up, the present invention utilizes dual-polarization manipulator to achieve the frequency measurement scope of 2-28GHz.Due to upper and lower two roods The power curve near-complementary arrived, the ACF slope of curve obtained is big, and certainty of measurement is high.By controlling the angle of Polarization Controller, Change the polarization state of lower road signal, it is possible to achieve measure the regulation of scope.In practical engineering application, preferably divide to obtain Resolution, can reduce frequency measurement scope.Regulation is simple, it is easy to accomplish.
In a word, embodiments described above is only embodiments of the invention, is not only used for limiting the guarantor of the present invention Protect scope, it is noted that for those skilled in the art, in present disclosure, it is also possible to Making deformation and the replacement of some equivalents, the length of single-mode fiber does not limit 5km, if using the single-mode fiber of 25km, this system Frequency measurement scope be 0-16GHz.Additionally, the angle α of polarization beam apparatus main shaft and the polarizer is not limited to 75 °.These etc. With deformation and the scope replacing the protection that should be regarded as the present invention mutually.

Claims (4)

1. one kind utilizes dual-polarization manipulator to realize the device that transient microwave frequency is measured: include that light source, signal source, dual-polarization are adjusted Device processed (DPol-MZM), single-mode fiber, bonder, Polarization Controller, the polarizer and photodetector, it is characterised in that: double Light polarization modulator is arranged on the emitting light path of light source, and the outfan of manipulator is connected with bonder through one section of optical fiber, bonder An outfan be connected with photodetector 1, another outfan is sequentially connected with a Polarization Controller and the polarizer, is polarized The outfan of device photodetector 2 in succession.
Described DPol-MZM is integrated by the polarization beam apparatus of MZM1, MZM2 and afterbody.In DPol-MZM, light source sends Optical signal is divided into two-way, is respectively inputted in MZM1 and MZM2, and the microwave signal that signal source produces is input to the one of MZM1 Individual rf inputs mouth, other three prevention at radio-frequency port zero loads, MZM1 and MZM2 is all biased in maximum transmitted point.MZM1 output is treated Surveying optical signal and the light carrier of radiofrequency signal phase-modulation, MZM2 only exports light carrier, through the polarization beam apparatus of afterbody, it is achieved The polarization state orthogonalization of two paths of signals.Polarisation-multiplexed signal is obtained at DPol-MZM outfan.
Described DPol-MZM is connected with bonder after a section single-mould fiber.Signal is divided into two-way by bonder, and a road is straight Access photodetector 1, lead up to Polarization Controller and after polarisation-multiplexed signal is converted into linear polarization signal by the polarizer Access photodetector 2, obtain the power response that two-way is different.Two-way power carries out comparing and obtains power comparison function (ACF), According to treating measured frequency and power ratio relation one to one, calculate the frequency of microwave signal to be measured.
Photonic propulsion transient microwave frequency measurement apparatus the most according to claim 1, it is characterised in that: the power that two-way obtains Response curve near-complementary, the slope of ACF is big, and certainty of measurement is high.
Photonic propulsion transient microwave frequency measurement apparatus the most according to claim 1, it is characterised in that: change signal source and produce The power of microwave signal to be measured, measurement result does not has significant change.
Photonic propulsion transient microwave frequency measurement apparatus the most according to claim 1, it is characterised in that: by regulation polarization control Device processed can change frequency measurement scope.
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