CN108362388A - A kind of measurement method of double passage differential laser phase noise - Google Patents
A kind of measurement method of double passage differential laser phase noise Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/04—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by beating two waves of a same source but of different frequency and measuring the phase shift of the lower frequency obtained
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Abstract
The present invention relates to a kind of measurement method of twin channel laser phase noise, mainly solve the problem of that existing laser phase noise measurement system stability is not high and system low-frequency noise is affected to measurement accuracy.The present invention uses a kind of measuring device of double passage differential laser phase noise, and hardware platform includes：Testing laser device, adjustable optical attenuator, DPSK electrooptic modulators, two photodetectors, two low noise, data acquisition circuit, computer, DPSK modulator control circuits, using mature and stable electrooptic modulator laser phase noise testing is realized instead of fibre optic interferometer, and signal is received using double passage differential, the stability of measuring system is not only increased, and eliminates some effects of the background noise to measurement result of system.
Description
Technical field
The invention belongs to fields of measurement, more particularly to a kind of measurement method of double passage differential laser phase noise.
Background technology
Photoelectric technology is the indispensable part in modern high technology field, penetrates into the every aspect of national life,
It also plays an important role in national defense construction, the phase noise of laser is the parameter and optical fiber for characterizing laser wavelength shake
Sensor-based system and light carry the key factor that system signal noise ratio is influenced in microwave transmission system, and the phase for measuring laser is made an uproar
It is very crucial that influence of the sound to the screening of laser device, technology controlling and process and its correspondence system, which carries out evaluation,.
The method of common measurement laser phase noise is that shift frequency heterodyne method is drawn using fibre optic interferometer in an arm
Enter long delay and acousto-optic frequency translation to realize the measurement of laser phase noise, the measurement accuracy of fibre optic interferometer depends primarily on sharp
The stability of light frequency, common method is to make the frequency stabilization of laser, more demanding to working environment.
The present invention proposes to replace fibre optic interferometer with mature and stable electrooptic modulator, and utilizes the side of double passage differential
Method realizes the measurement of laser phase noise, has both improved the stability of system, also eliminates the background noise of system to measuring
The influence of precision.
Invention content
The technical problem to be solved in the present invention overcomes existing defect, proposes a kind of new double passage differential laser phase
The measurement method of noise realizes laser phase noise testing, using double using electrooptic modulator instead of fibre optic interferometer
Channel differential received signal improves the stability of measuring system, eliminates some effects of the background noise to measurement accuracy of system,
The technical solution that the present invention uses to solve above-mentioned technical problem is as follows：The present invention is by using a kind of binary channels
The measurement method of differential laser phase noise, including testing laser device, adjustable optical attenuator, DPSK electrooptic modulators, photoelectricity
Detector, low noise, photodetector, low noise, data acquisition circuit, computer, DPSK modulator control circuits, it is described to wait for
It surveys the light that laser is sent out after an adjustable optical attenuator to enter in the DPSK electrooptic modulators of a pair of output, the DPSK tune
Device processed adjusts the optical path difference in DPSK modulators between two-way transmission optical signal, the DPSK modulator controls by control circuit
The two ways of optical signals of circuit output end output carries certain light delay inequality, and two paths of signals respectively enters two photodetectors
In, described two photodetectors are located at different transmission channels, and two electric signals of output pass through two low noise respectively
Be amplified into data acquisition circuit, described two low noise are located at different transmission channels, the data acquisition circuit with
Computer connects, and after the computer acquisition data carry out difference processing to two paths of signals again, eliminates system noise floor to surveying
The influence of result is measured, then sends DPSK modulator controls circuit (201) to, the background noise is mainly derived from photodetector
And low noise.
The technical solution that the present invention uses to solve above-mentioned technical problem, the work that the present invention is further explained uses are former
Reason, specific measuring principle are as follows：
The light field of the output of the DPSK modulators is represented by：
F is light source frequency, E in formulain(f) it is the optical field distribution on incident nearly detector, τ is the two of DPSK modulators output
Differential delay between the signal of road.Above formula can approximate representation be：
δ f shake for laser frequency in formula, which is converted into the phase noise of laser.In above formulaIn the wavelength bandwidth of laser, by the delay inequality or tune that adjust interferometer two-arm in DPSK
The wavelength for saving laser, may make to a determining light frequency f0, haveTherefore, formula (2) is：
DPSK electrooptic modulator output signals are changed into electric signal after photodetector, after low noise, due to
Laser phase noise and the electric signal of photodetector output that introduces is dithered as：
Vnoise=π τ IinRκGδf+Vsystem (4)
I in above formulainTo enter the light intensity on photodetector, R is detector output loading, and κ is photodetector
Responsiveness, G are the amplification factor of low noise, VsystemTo test the background noise of system.The direct current signal of photodetector output
Can be：
Two paths of signals carries out difference processing after data acquisition circuit acquires, to two paths of signals, so that it may to eliminate test
The background noise V of systemsystemInfluence to measurement result, the noise are mainly derived from photodetector and the noise of low noise.
As a result of difference detecting, and enable π τ I in formula (4)inR κ G=K, then formula (4) be expressed as：
Vnoise=K δ f+Vsystem (6)
Voltage fluctuation by the photodetector converted due to the phase noise of laser obtained to formula (4)
Value carries out Fourier transformation, obtains the power spectral density S of detector output voltagev(f) it is expressed as：
B is signal bandwidth in above formula.Then the phase noise L (f) of testing laser device is expressed as：
Above formula just characterizes phase noise of the laser when frequency deviation is f.Therefore, the voltage exported according to photodetector
Fluctuation can be obtained by the phase noise of testing laser device.
The beneficial effects of the present invention are：It is realized instead of fibre optic interferometer using mature and stable electrooptic modulator sharp
Light device phase noise measurement receives signal, relatively traditional measurement scheme using double passage differential, and measurement had both can be improved in this method
The stability and measurement accuracy of system, and some effects of the background noise to measurement result of system can be eliminated.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the measuring system block schematic illustration of double passage differential laser phase noise of the present invention；
In attached drawing：
101, testing laser device 102, adjustable optical attenuator 103, DPSK electrooptic modulators
104, photodetector 105, low noise 106, photodetector
107, low noise 108, data acquisition circuit 109, computer
201, DPSK modulator controls circuit
Specific implementation mode
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following specific implementation modes are only
For illustrating the present invention rather than limiting the scope of the invention.
A kind of measurement method of double passage differential laser phase noise, it is dry instead of optical fiber using stable electrooptic modulator
Interferometer receives signal to realize laser phase noise testing using double passage differential.
As shown in Figure 1, a kind of measurement method of double passage differential laser phase noise, hardware platform include,
Testing laser device (101), adjustable optical attenuator (102), DPSK electrooptic modulators (103), photodetector (104), low noise
(105), photodetector (106), low noise (107), data acquisition circuit (108), computer (109), DPSK modulator controls
Circuit (201) processed, the testing laser device (101) are opened, and the light sent out enters after an adjustable optical attenuator (102)
In the DPSK electrooptic modulators (103) of one dual output.
The DPSK electrooptic modulators (103) are adjusted by receiving the signal that DPSK modulator controls circuit (201) transmits
Save the optical path difference between two-way transmission light in DPSK electrooptic modulators (103), the DPSK modulator controls circuit (201) with
Computer (109) connects, and the computer (109) connect with data acquisition circuit (108), passes through data acquisition circuit (108)
Difference processing is carried out to two paths of signals again after obtaining two paths of signals data, to eliminate shadow of the background noise to measurement result of system
It rings, the background noise is mainly derived from photodetector and low noise, and the computer (109) transmits the signal handled well
To DPSK modulator controls circuit (201), the two ways of optical signals of DPSK electrooptic modulators (103) the output end output carries one
Fixed light delay inequality, the two ways of optical signals that the DPSK electrooptic modulators (103) generate respectively enter in photodetector (104)
In photodetector (106).
The double passage differential receives photodetector (104) and photodetector (106) in signal device and is located at difference
Transmission channel, DPSK electrooptic modulators (103) output light is changed into telecommunications after photodetector (104,106)
Number, the electric signal of described two photodetector outputs is amplified into number by low noise (105) and low noise (107) respectively
According in Acquisition Circuit (108), the low noise (105) and low noise (107) are located at different transmission channels.
The operation principle that the measurement method of the twin channel laser phase noise of the present invention uses includes as follows：
First, the light field of the output of DPSK modulators is represented by：
In formula, f is light source frequency, Ein(f) it is the optical field distribution on incident nearly detector, τ is the output of DPSK modulators
Differential delay between two paths of signals.Above formula can approximate representation be：
δ f shake for laser frequency in formula, which is converted into the phase noise of laser.In above formulaIn the wavelength bandwidth of laser, by the delay inequality or tune that adjust interferometer two-arm in DPSK
Save the wavelength of laser so as to a determining light frequency f0, haveTherefore, formula (2) is expressed as：
DPSK electrooptic modulator output signals are changed into electric signal after photodetector, after low noise, due to
Laser phase noise and the electric signal of photodetector output that introduces is dithered as：
Vnoise=π τ IinRκGδf+Vsystem (4)
I in above formulainTo enter the light intensity on photodetector, R is detector output loading, and κ is photodetector
Responsiveness, G are the amplification factor of low noise, VsystemTo test the background noise of system.The direct current signal of photodetector output
It is represented by：
Twin-channel two paths of signals carries out difference processing after data acquisition circuit acquires, to two paths of signals, so that it may with
Eliminate the background noise V of test systemsystemInfluence to measurement result, the noise are mainly derived from photodetector and low noise
The noise put.
As a result of difference detecting, and enable π τ I in formula (4)inR κ G=K, then formula (4) be expressed as：
Vnoise=K δ f+Vsystem (6)
Voltage fluctuation by the photodetector converted due to the phase noise of laser obtained to formula (4)
Value carries out Fourier transformation, obtains the power spectral density S of detector output voltagev(f) it is expressed as：
In formula, B is signal bandwidth.Then the phase noise L (f) of testing laser device is expressed as：
Above formula characterizes phase noise of the laser when frequency deviation is f.Therefore, the voltage wave exported according to photodetector
The dynamic phase noise that testing laser device can be obtained.
Although the illustrative specific implementation mode of the present invention is described above, in order to the technology of the art
Personnel are it will be appreciated that the present invention, but the present invention is not limited only to the range of specific implementation mode, to the common skill of the art
For art personnel, as long as long as various change the attached claims limit and determine spirit and scope of the invention in, one
The innovation and creation using present inventive concept are cut in the row of protection.
Claims (1)
1. a kind of measurement method based on double passage differential laser phase noise-measuring system, which is characterized in that specific to measure
Principle is as follows：
The light field of the output of the DPSK modulators (103) is represented by：
In formula, f is light source frequency, Ein(f) it is the optical field distribution on incident nearly detector, τ is DPSK modulators output
Differential delay between two paths of signals, above formula can approximate representation be：
In formula, δ f shake for laser frequency, which is converted into the phase noise of laser,
It, can be with by adjusting the delay inequality of interferometer two-arm in DPSK or adjusting the wavelength of laser in the wavelength bandwidth of laser
So that a determining light frequency f0, haveTherefore, formula (2) is expressed as：
The photoelectricity DPSK modulator output lights are changed into electric signal after photodetector, after low noise, due to swashing
Light device phase noise and the shake of electric signal of photodetector output that introduces is represented by：
Vnoise=π τ IinRκGδf+Vsystem (4)
In formula, IinTo enter the light intensity on photodetector, R is detector output loading, and κ is the response of photodetector
Degree, G are the amplification factor of low noise, VsystemTo test the background noise of system, the direct current signal of photodetector output indicates
For：
Two paths of signals carries out difference processing after data acquisition circuit acquires, to two paths of signals, so that it may to eliminate test system
Background noise VsystemInfluence to measurement result, the noise are mainly derived from photodetector and the noise of low noise, due to
Difference detecting is used, and enables π τ I in formula (4)inR κ G=K, then formula (4) be represented by：
Vnoise=K δ f+Vsystem (6)
By the magnitude of a voltage fluctuation of the photodetector converted due to the phase noise of laser that formula (4) is obtained into
Row Fourier transformation obtains the power spectral density S of detector output voltagev(f) it is represented by：
B is signal bandwidth in formula, then the phase noise L (f) of testing laser device is represented by：
Above formula just characterizes phase noise of the laser when frequency deviation is f, therefore the voltage fluctuation exported according to photodetector
It can be obtained by the phase noise of testing laser device.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110445007A (en) * | 2019-07-10 | 2019-11-12 | 深圳市迅特通信技术有限公司 | The method and device of laser dense wave division multipurpose wavelength stabilization control |
| CN110749420A (en) * | 2019-09-12 | 2020-02-04 | 芯华创(武汉)光电科技有限公司 | OFDR detection device |
| CN113804283A (en) * | 2021-09-15 | 2021-12-17 | 中国人民解放军国防科技大学 | System and method for testing phase noise of interference type optical fiber hydrophone |
| CN114199276A (en) * | 2021-11-11 | 2022-03-18 | 北京自动化控制设备研究所 | Magnetic resonance phase detection method and system under atomic spin ensemble state |
| CN115396018A (en) * | 2022-07-26 | 2022-11-25 | 西安空间无线电技术研究所 | System and method for testing gain and noise coefficient of optical fiber amplifier |
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| CN110445007A (en) * | 2019-07-10 | 2019-11-12 | 深圳市迅特通信技术有限公司 | The method and device of laser dense wave division multipurpose wavelength stabilization control |
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| CN113804283A (en) * | 2021-09-15 | 2021-12-17 | 中国人民解放军国防科技大学 | System and method for testing phase noise of interference type optical fiber hydrophone |
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| CN114199276A (en) * | 2021-11-11 | 2022-03-18 | 北京自动化控制设备研究所 | Magnetic resonance phase detection method and system under atomic spin ensemble state |
| CN114199276B (en) * | 2021-11-11 | 2023-09-12 | 北京自动化控制设备研究所 | Magnetic resonance phase detection method and system in atomic spin ensemble state |
| CN115396018A (en) * | 2022-07-26 | 2022-11-25 | 西安空间无线电技术研究所 | System and method for testing gain and noise coefficient of optical fiber amplifier |
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Address after: 701, 801, building C3, Nanshan wisdom garden, 1001 Xueyuan Avenue, Changyuan community, Taoyuan Street, Nanshan District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Xunte Communication Technology Co.,Ltd. Patentee after: JIANGXI SONT COMMUNICATION TECHNOLOGY Co.,Ltd. Address before: 701, 801, building C3, Nanshan wisdom garden, 1001 Xueyuan Avenue, Changyuan community, Taoyuan Street, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: SHENZHEN SONT TECHNOLOGY Co.,Ltd. Patentee before: JIANGXI SONT COMMUNICATION TECHNOLOGY Co.,Ltd. |