CN106656322B - The method for realizing Instantaneous Frequency Measurement using phase-modulator - Google Patents
The method for realizing Instantaneous Frequency Measurement using phase-modulator Download PDFInfo
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- CN106656322B CN106656322B CN201610846182.3A CN201610846182A CN106656322B CN 106656322 B CN106656322 B CN 106656322B CN 201610846182 A CN201610846182 A CN 201610846182A CN 106656322 B CN106656322 B CN 106656322B
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- 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
Abstract
The invention discloses a kind of method for realizing Instantaneous Frequency Measurement using lithium niobate phase modulator, which is related to microwave technical field and technical field of photo communication, is mainly used in electronic reconnaissance field.Described this method is as shown in the picture, including laser, Polarization Controller, phase-modulator, standard single-mode fiber, optical splitter, the polarizer and photoreceiver.Utilize the Polarization-Sensitive characteristic of lithium niobate phase modulator, by rationally adjusting Polarization Controller, it can be realized simultaneously phase-modulation and intensity modulated, in conjunction with the dispersion characteristics of optical fiber, two opposite frequency response functions of variation tendency can be constructed, therefore resulting amplitude comparison function has faster variation in big frequency band.By calculating the power ratio of two branches up and down, may be implemented to treat the Frequency Estimation for surveying microwave signal.The measurement error that the device obtains in 1.6-24.6 GHz range is less than ± 0.3 GHz.
Description
Technical field
The present invention relates to technical field of photo communication and microwave technical fields more particularly to a kind of based on the micro- of phase-modulator
Wave signal transient frequency measurement method.
Background technique
In electronic warfare field, intercept and capture and identify to realize from the radar of enemy or the radiation information of communication system,
Firstly the need of the working frequency for estimating its electronic system.It can rapidly be realized by instantaneous frequency measurement technology and radiation source frequency is estimated
Meter, in order to realize electronic reconnaissance, attack and defense.
Traditional electrical domain instantaneous frequency measurement system is generally realized by microwave interference to Frequency Estimation.Using microwave interference technology
Instantaneous Frequency Measurement system need using RF Power Splitter and radio-frequency transmission line, and which has limited the expansions of system operating frequency
Exhibition.As modern radar system gradually extends to higher frequency section, electrical domain Frequency Measurement System will be no longer applicable in.
Microwave photon technology can solve conventional electronics method and be difficult even insurmountable problem.Using microwave photon
The Instantaneous Frequency Measurement system of technology auxiliary can work in higher frequency section, have more low-loss, smaller szie and anti-electromagnetism dry
The advantages that disturbing.Therefore, the Technology of Measuring Instant Frequency based on microwave photon technology is expected to play in future electronic war field important
Effect.
The invention proposes a kind of simple microwave photons of structure to assist Instantaneous Frequency Measurement system.Utilize lithium niobate phase
Modulated optical signal is divided into two branches up and down, utilizes list by the modulator characteristic inconsistent to TE and TM optical mode modulation efficiency
The dispersion characteristics of mode fiber can construct two opposite power fading functions of variation tendency in upper and lower two branch respectively.It is logical
The power ratio for comparing two paths of signals is crossed, the frequency values of incident microwave signals can be quickly estimated.The apparatus structure is simple,
Only need a light source and a phase-modulator, it is easy to accomplish.
Summary of the invention
The technical solution of the invention is as follows: the method for realizing Instantaneous Frequency Measurement using phase-modulator, feature exist
In: the method using distributed feedback laser, Polarization Controller, phase-modulator, standard single-mode fiber, optical splitter,
Inclined device and photodetector, vector network analyzer.The output end of laser passes through the first Polarization Controller and phase-modulation
Device is connected, and the output end of phase-modulation is connected with standard single-mode fiber, and optical fiber output port is connected with optical splitter, optical splitter
The first output port be connected with photoreceiver 1, the second output terminal mouth of optical splitter be sequentially connected respectively Polarization Controller and
The polarizer finally injects photoreceiver 2.
Above-mentioned phase-modulator is Z axis cutting phase modulator, is apparently higher than TE optical mode to the modulation efficiency of TM optical mode
Formula.
Above-mentioned photoreceiver integrates PIN diode by a waveguide and a trans-impedance amplifier is constituted.
Using phase-modulator realize transient microwave frequency measurement method the following steps are included:
(1) it is by the wavelength that laser exportsλLinearly polarized light be injected into phase-modulator by Polarization Controller, adjust
Section Polarization Controller makes the main shaft of incident ray polarized light and phase-modulator in 45 °；
(2) prevention at radio-frequency port of the phase modulated device of microwave signal to be measured of unknown frequency is loaded on phase-modulator, is adjusted
The polarisation-multiplexed signal of system output TM and TE；
(3) polarisation-multiplexed signal is transmitted by 5km standard single-mode fiber；
(4) the palarization multiplexing optical signal transmitted through optical fiber is divided into two branches up and down using optical splitter；
(5) optical signal of branch is directly injected into photoreceiver on；
(6) optical signal of branch first passes through Polarization Controller under, and TE and TM polarization signal are then realized at the polarizer
Interference, the light wave after interference is linearly polarized light, into photoreceiver.
(7) by adjusting the Polarization Controller of lower branch, the main shaft and TE and TM polarization state of the polarizer can be changed simultaneously
It is opposite to realize that the frequency response function of two branches up and down has for relative phase shift between two polarization states of angle and TE and TM
Variation tendency.
(8) by calculating the electric signal power ratio of two branches up and down, the frequency of microwave signal to be measured can be uniquely determined
Rate value.
The invention proposes a kind of simple microwave photons of structure to assist instantaneous frequency measurement method.This method utilizes niobic acid
Modulated optical signal is divided into two branches up and down by the lithium phase-modulator characteristic different to the modulation efficiency of TE with TM optical mode,
Using the dispersion characteristics of single mode optical fiber, two opposite frequency response letters of variation tendency can be constructed in upper and lower two branch respectively
Number can construct the amplitude comparison function with larger slope by comparing the power of upper and lower branch, and then realize bigger
High-precision Instantaneous Frequency Measurement in bandwidth range.
This method only needs a phase-modulator, therefore does not need bias control circuit.The configuration of single laser source so that
System does not need optical wavelength division multiplexing device, and frequency-measurement accuracy is not influenced by light source power floating.
This method does not need the device of the frequency limiteds such as RF Power Splitter or electric frequency mixer, the frequency measurement range of system only light
The limitation of the bandwidth of transmitter and photoreceiver.
Detailed description of the invention
Fig. 1 is that the present invention is based on the Instantaneous Frequency Measurement schematic diagrams of phase-modulator；
Fig. 2 is the frequency response function figure of upper and lower two branch in experiment test；
Fig. 3 is to test in test, obtained two branch power ratio curve figure up and down；
Fig. 4 is frequency measurement in experiment test；
Fig. 5 is frequency error measurement result figure in experiment test.
Specific embodiment
Elaborate with reference to the accompanying drawing to the embodiment of the present invention: the present embodiment before being with technical solution of the present invention
It puts and is implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to down
The embodiment stated:
As shown in Figure 1, device includes: distributed feedback laser, Polarization Controller 1, vector network analysis in the present embodiment
Instrument, phase-modulator, optical splitter, Polarization Controller 2, the polarizer, photoreceiver 1 and photoreceiver 2.The output end of laser
Mouth is connected with the input port of Polarization Controller 1, and the output of Polarization Controller is connected with the input port of phase-modulator, radio frequency
The output of signal source is connected with the prevention at radio-frequency port of phase-modulator.The input port phase of the output port of phase-modulator and optical fiber
Even, the output port of optical fiber is connected with the input port of optical splitter, the upper branch of optical splitter export directly with photoreceiver 1
It is connected, the lower branch output of optical splitter is sequentially connected Polarization Controller 2 and the polarizer, the output port and light of the polarizer respectively
The input port of receiver is connected.By adjusting two Polarization Controllers, the frequency response function of upper and lower two branch has on the contrary
Variation tendency, can estimate the input power of radiofrequency signal by calculating power ratio.
In this example, the specific implementation step of method is:
Step 1: laser generates operation wavelengthHalf-wave is input to after Polarization Controller 1 for the light carrier of 1552 nm
Voltage is the Z axis cutting phase modulator of 7 V.Adjustment Polarization Controller 1 makes the linearly polarized light and phase-modulator of input
Main shaft is in 45 °.The radio frequency output of vector network analyzer is connected with the prevention at radio-frequency port of phase-modulator, output radio-frequency power setting
For -3 dBm.
Step 2: modulated polarisation-multiplexed signal is input in 5 km standard single-mode fibers, the abbe number of optical fiber is
17 ps/nm/km。
Step 3: the optical signal of optical fiber output is divided into two branches up and down.Upper branch is directly connected with photoreceiver 1, under
Branch output is successively connected with Polarization Controller 2, the polarizer and photoreceiver 2.Polarization Controller 2 is adjusted to polarize at two
The relative phase shift introduced between state is 0.8 π, and polarization direction and polarizer angle are 0.14 π.
Step 4: the output end of photoreceiver is connected with the rf inputs of vector network analyzer.Utilize vector network
The frequency response curve of available two branches up and down of analyzer, as shown in Figure 2.
Step 5: amplitude can be constructed using the power ratio of upper and lower two branch according to resulting frequency response curve
Comparison function, as shown in Figure 3.Frequency is established with radio-frequency power than corresponding look-up table using measured data.
Step 6: the RF signal power of input is changed to -20 dBm for the feasibility of validated measurement systems, change
The frequency of input signal, and record the power of two branches up and down.Using established look-up table, by tabling look-up, frequency is realized in search
Estimation.Measurement result as shown in figure 4, corresponding measurement error as shown in figure 5, error be less than ± 0.3GHz.
To sum up, the present invention realizes the Instantaneous Frequency Measurement to microwave signal, the device using lithium niobate phase modulator
Structure is simply easily achieved, cheap, is not influenced by electronic bottleneck.Further, since using only single laser source, system is not
WDM device is needed, and measurement accuracy is not influenced by light source power fluctuation.The program only needs a phase-modulator,
There is no the bias drift problems for being influenced by environment and being generated, therefore do not need complicated bias control circuit.Pass through construction two
The opposite frequency response function of variation tendency, the program can realize the microwave frequency measurement of large scale and high accuracy.
In short, embodiments described above is only the embodiment of the present invention, not it is only used for limiting protection model of the invention
It encloses, it is noted that for those skilled in the art, in present disclosure, can also make
Several equivalent variations and replacement, phase-modulator are not limited to Z axis cutting, optical carrier wavelength, the length of optical fiber, dispersion values, polarization
The adjustment of state etc. also should be regarded as the scope of protection of the invention.
Claims (3)
1. a kind of method for realizing Instantaneous Frequency Measurement using phase-modulator, which is characterized in that the method uses distribution
Feedback laser, Polarization Controller, phase-modulator, standard single-mode fiber, optical splitter, the polarizer and photoreceiver swash
The output of light device is connected by the first Polarization Controller with phase-modulator, the microwave signal input phase tune to be measured of unknown frequency
The output of the prevention at radio-frequency port of device processed, phase-modulator is connected with optical fiber, and optical fiber output port is connected with optical splitter, optical splitter
The first output port be connected with the first photoreceiver, the second output terminal mouth of optical splitter is sequentially connected the second polarization control respectively
Device and the polarizer processed, finally inject the second photoreceiver, and the radio-frequency power by measuring and comparing output can estimate letter to be measured
Number frequency information, the phase-modulator is different for the modulation efficiency of TE with TM optical mode, passes through and adjusts the first polarization control
Device processed makes incident ray polarized light and phase-modulator main shaft at an angle, after optical fiber transmits, the upper branch of optical splitter
Road output is phase modulated signal, adjusts the second Polarization Controller of lower branch, electro-optic intensity may be implemented after the polarizer
Modulation, it is contemplated that the frequency response function of effect of dispersion, upper branch and lower branch has opposite variation tendency, utilizes vector net
Network analyzer can measure the frequency response function of upper and lower two branch, using the data obtained, function of the branch with lower branch in calculating
Rate ratio can establish frequency-radio-frequency power ratio look-up table, for the microwave signal to be measured of unknown frequency, calculate branch up and down
The power ratio on road can quickly estimate the frequency information of measured signal by the method for searching for look-up table.
2. the method according to claim 1 for realizing Instantaneous Frequency Measurement using phase-modulator, which is characterized in that phase
Modulator is different for the modulation efficiency of TE with TM optical mode, can be realized simultaneously phase tune in conjunction with Polarization Controller and the polarizer
System and intensity modulated.
3. the method according to claim 1 for realizing Instantaneous Frequency Measurement using phase-modulator, which is characterized in that up and down
The frequency response function of branch has opposite variation tendency, by calculating the power ratio of two branches up and down, resulting Amplitude Ratio
There is biggish slope in the larger frequency range compared with function.
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| CN107835053B (en) * | 2017-11-08 | 2020-10-20 | 西安电子科技大学 | High-precision instantaneous microwave frequency measuring device |
| CN108226297A (en) * | 2018-01-15 | 2018-06-29 | 国网江苏省电力公司检修分公司特高压交直流运检中心 | A kind of vacuum tube bellows surface crack detecting method based on fiber grating |
| CN108449131B (en) * | 2018-04-16 | 2019-11-08 | 苏州六幺四信息科技有限责任公司 | A kind of coherent optical heterodyne communicatio measurement method of parameters, device based on mixing |
| CN110059326B (en) * | 2018-04-20 | 2023-05-05 | 南方科技大学 | Simulation method and simulation system for debugging microwave device |
| CN108833006A (en) * | 2018-06-29 | 2018-11-16 | 中国科学院半导体研究所 | Instantaneous Frequency Measurement device and method based on microwave photon filter |
| CN109951227A (en) * | 2019-02-12 | 2019-06-28 | 中国科学院半导体研究所 | Microwave instantaneous frequency measurement device, circuit and method |
| CN110632388B (en) * | 2019-09-27 | 2020-10-02 | 南京航空航天大学 | Frequency mixing-based photoelectric detector frequency response measuring method and device |
| CN110988474B (en) * | 2019-12-26 | 2021-09-28 | 中国科学院国家天文台 | Spectrum measuring system |
| CN111277325B (en) * | 2020-01-20 | 2021-05-04 | 北京邮电大学 | Instantaneous frequency measurement method and system with adjustable measurement range based on polarization modulator |
| CN112751610A (en) * | 2020-12-29 | 2021-05-04 | 武汉光迅科技股份有限公司 | Method and system for measuring SMZM modulation arm phase shift function |
| CN115225159B (en) * | 2022-07-15 | 2023-10-13 | 中国电子科技集团公司第三十四研究所 | Device and method for enhancing demodulation signal-to-noise ratio of high-light phase modulation signal |
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| CN105812053A (en) * | 2016-03-07 | 2016-07-27 | 北京邮电大学 | Instantaneous frequency measuring method and system |
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