CN106092520A - The measurement apparatus of Distributed Feedback Laser frequency noise and method - Google Patents
The measurement apparatus of Distributed Feedback Laser frequency noise and method Download PDFInfo
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Abstract
A kind of measurement apparatus of Distributed Feedback Laser frequency noise, including Distributed Feedback Laser to be measured, electrooptic modulator, dispersive optical fiber, photodetector, vector network analyzer, the monochromatic polarized light that described Distributed Feedback Laser to be measured sends enters to inject electrooptic modulator, the port 1 of vector network analyzer exports the radiofrequency signal of a frequency sweep and enters electrooptic modulator, light carrier with radiofrequency signal incides in dispersive optical fiber after electrooptic modulator exports, photodetector receives this light carrier and exports radiofrequency signal, radiofrequency signal enters the port 2 of vector network analyzer, it is acquired by vector network analyzer and analyzes, Distributed Feedback Laser to be measured, electrooptic modulator, high speed detector constitutes a microwave photon link.The invention also discloses the measuring method of a kind of Distributed Feedback Laser frequency noise.The invention have the advantages that measuring speed is fast, certainty of measurement is high, and is not affected by environmental factors.
Description
Technical field
Present document relates to the measuring method of laser frequency noise, belong to laser parameter fields of measurement.
Background technology
The survey of Distributed Feedback Laser (Distributed Feedback Laser, i.e. distributed feedback laser) frequency noise
Amount is the important research direction of laser parameter measurement technology, and conventional measuring methods is all by long delay interferometric method and phase shift method
Realize etc. method, but the environment resistant jamming performance of these measuring methods is poor, and need complicated time frequency analysis algorithm
Calculating and analyze measurement result, therefore, measuring speed is slow, and certainty of measurement is low.
Summary of the invention
The technical problem to be solved there are provided one and has measuring speed soon, and certainty of measurement is high, and
Not by the measurement apparatus of Distributed Feedback Laser frequency noise and the method for the advantages such as such environmental effects.
The present invention is to solve above-mentioned technical problem by the following technical programs: the survey of a kind of Distributed Feedback Laser frequency noise
Amount device, including Distributed Feedback Laser 101 to be measured, electrooptic modulator 102, dispersive optical fiber 103, photodetector 104, vector network
Analyser 105, the monochromatic polarized light that described Distributed Feedback Laser to be measured 101 sends enters to inject electrooptic modulator 102, vector network
The port 1 of analyser 105 export a frequency sweep radiofrequency signal enter electrooptic modulator 102, with radiofrequency signal light carrier from
Inciding in dispersive optical fiber 103 after electrooptic modulator 102 output, photodetector 104 receives this light carrier and exports radio frequency letter
Number, radiofrequency signal enters the port 2 of vector network analyzer 105, vector network analyzer 105 be acquired and analyze, treating
Surveying Distributed Feedback Laser 101, electrooptic modulator 102, photodetector 104 constitutes a microwave photon link.
Optimizing, the measurement apparatus of this Distributed Feedback Laser frequency noise also includes the unidirectional current being connected to electrooptic modulator 102
Source 106, the operating point of described electrooptic modulator 102 is regulated by DC source 106.
Optimizing, the operation wavelength of each optical device matches with the fiber work wavelength of Distributed Feedback Laser 101 to be measured.
The measuring process of the measurement apparatus of described Distributed Feedback Laser frequency noise is as follows:
First, in the case of not connecing dispersive optical fiber 103, the wavelength that Distributed Feedback Laser 101 to be measured exports is adjusted to λ0, use
Vector network analyzer 105 measures this microwave photon link in frequency f1The position at place is worth mutually, and carries out return-to-zero；
By an a length of L, abbe number be dispersive optical fiber 103 two ends of D be connected respectively to electrooptic modulator 102 output and
The input of photodetector 104；
This microwave photon link is measured in microwave signal frequency f with vector network analyzer 1051The maximum ripple of the position phase at place
Dynamic value φ；
By formula Δ f=φ/360DLf1λ0 2Calculate Distributed Feedback Laser 101 frequency noise Δ f to be measured.
Optimizing, the operating point of electrooptic modulator 102 is regulated by DC source 106, changes the defeated of DC source 106
Go out voltage and can change the offset operation point of electrooptic modulator 102, and then change the output intensity of electrooptic modulator 102.
Optimizing, dispersive optical fiber 103 abbe number is more than 200ps/km/nm, and dispersive optical fiber length is more than 15km.
Optimizing, the frequency response of electrooptic modulator 102, photodetector 104 and vector network analyzer is more than
40GHz。
The measurement apparatus that the invention also discloses a kind of Distributed Feedback Laser frequency noise used described in any of the above-described scheme is entered
The method that row is measured, comprises the steps:
First, in the case of not connecing dispersive optical fiber 103, the wavelength that Distributed Feedback Laser 101 to be measured exports is adjusted to λ0, use
Vector network analyzer 105 measures this microwave photon link in frequency f1The position at place is worth mutually, and carries out return-to-zero；
By an a length of L, abbe number be dispersive optical fiber 103 two ends of D be connected respectively to electrooptic modulator 102 output and
The input of photodetector 104；
This microwave photon link is measured in microwave signal frequency f with vector network analyzer 1051The maximum ripple of the position phase at place
Dynamic value φ；
By formula Δ f=φ/360DLf1λ0 2Calculate Distributed Feedback Laser 101 frequency noise Δ f to be measured.
Optimizing, the operating point of electrooptic modulator 102 is regulated by DC source 106, changes the defeated of DC source 106
Go out voltage and can change the offset operation point of electrooptic modulator 102, and then change the output intensity of electrooptic modulator 102.
Optimizing, dispersive optical fiber 103 abbe number is more than 200ps/km/nm, and dispersive optical fiber length is more than 15km, and electric light is adjusted
The frequency response of device 102 processed, photodetector 104 and vector network analyzer is more than 40GHz.The length of dispersive optical fiber and dispersion
Coefficient is the biggest, and certainty of measurement is the highest.Measuring frequency the highest, certainty of measurement is the highest.
The present invention has the advantage that the present invention utilizes microwave photon technology, passes through electrooptic modulator compared to existing technology
Radiofrequency signal is loaded on light wave, utilizes vector network analyzer to analyze the phase change of radiofrequency signal to realize DFB laser
The measurement of device frequency noise, compares existing measuring method, and it is fast that the method possesses measuring speed, and certainty of measurement is high, and
Do not affected by environmental factors.The manipulator, detector and the vector network analyzer that use altofrequency response can improve measurement
Accuracy.
Accompanying drawing explanation
The measurement apparatus schematic diagram of a kind of Distributed Feedback Laser frequency noise that Fig. 1 provides for the present invention.
In Fig. 1: 101 is Distributed Feedback Laser to be measured, 102 is electrooptic modulator, and 103 is dispersive optical fiber, and 104 is high speed optoelectronic
Detector, 105 is vector network analyzer, and 106 is DC source.
Detailed description of the invention
Elaborating embodiments of the invention below, the present embodiment is carried out under premised on technical solution of the present invention
Implement, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following enforcement
Example.
Embodiment 1
The measurement apparatus of Distributed Feedback Laser frequency noise as it is shown in figure 1, the measurement apparatus of a kind of Distributed Feedback Laser frequency noise,
By Distributed Feedback Laser 101 to be measured, electrooptic modulator 102, dispersive optical fiber 103, photodetector 104, vector network analyzer 105
Constitute with DC source 106.
The monochromatic polarized light that described Distributed Feedback Laser to be measured 101 sends enters to inject intensity type electrooptic modulator 102.Network
The port 1 of vector analysis instrument 105 exports the radiofrequency signal of a frequency sweep and enters electrooptic modulator 102.Light with radiofrequency signal carries
Ripple incides in dispersive optical fiber 103 after manipulator exports, and photodetector 104 receives this light carrier and exports radiofrequency signal,
Radiofrequency signal is finally acquired with vector network analyzer 105 and analyzes.
Wherein, Wavelength tunable DFB narrow linewidth laser 101, electrooptic modulator 102, photodetector 104 constitute one micro-
Glistening light of waves sublink.The radiofrequency signal phase place that laser frequency noise can cause microwave photon link to export is shaken, by surveying
The phase changing capacity of the radiofrequency signal measuring the output of this link can be obtained by the frequency noise of testing laser device.
The operating point of described electrooptic modulator 102 is regulated by DC source 106, changes the defeated of DC source 106
Go out voltage and can change the offset operation point of electrooptic modulator 102, and then change the output intensity of electrooptic modulator 102.
Main photoelectric device parameter selects as follows:
The output of Distributed Feedback Laser 101 should be greater than 5mW, and extinction ratio is more than 20dB.
The operation wavelength of optical device should match with testing fiber operation wavelength.
The work process of measurement apparatus is as follows:
The polarized light of Distributed Feedback Laser 101 to be measured output is through intensity type electrooptic modulator 102.Network vector analyser 105
Port 1 export one frequency sweep radiofrequency signal enter electrooptic modulator 102 rf inputs.The operating point of electrooptic modulator 102
Being regulated by DC source 106, the output voltage changing DC source 106 can change the biasing work of electrooptic modulator 102
Make a little, and then change the output intensity of electrooptic modulator 102.Electrooptic modulator 102 by incident rf-signal modulation to light wave
Above exporting a light and carry radiofrequency signal, this light carries radiofrequency signal and incides after dispersive optical fiber 103 on photodetector 104,
High-speed photodetector 104 converts optical signals into radiofrequency signal and is linked into the port 2 of vector network analyzer 105 and adopts
Collection and analysis.
Distributed Feedback Laser frequency noise measurement specifically comprises the following steps that
First, in the case of not connecing dispersive optical fiber 103, the wavelength that Distributed Feedback Laser 101 to be measured exports is adjusted to λ0, use
Vector network analyzer is measured this microwave photon link position at frequency f1 and is worth mutually, and carries out return-to-zero.By an a length of L,
Abbe number is that dispersive optical fiber 103 two ends of D are connected respectively to the output of electrooptic modulator 102 and the defeated of photodetector 104
Enter end.The maximum fluctuation value of this microwave photon link position phase at microwave signal frequency f1 is measured with vector network analyzer
φ.By formula Δ f=φ/360DLf1λ0 2Just can calculate Distributed Feedback Laser frequency noise Δ f to be measured.
Dispersive optical fiber 103 abbe number is greater than 200ps/km/nm, and dispersive optical fiber length is greater than 15km.Measurement apparatus
In electrooptic modulator 102, the frequency response of photodetector 104 and vector network analyzer should be greater than 40GHz.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (10)
1. the measurement apparatus of a Distributed Feedback Laser frequency noise, it is characterised in that include Distributed Feedback Laser to be measured (101), electric light
Manipulator (102), dispersive optical fiber (103), photodetector (104), vector network analyzer (105), described DFB to be measured swashs
The monochromatic polarized light that light device (101) sends enters to inject electrooptic modulator (102), and the port 1 of vector network analyzer (105) exports
The radiofrequency signal of one frequency sweep enters electrooptic modulator (102), and the light carrier with radiofrequency signal exports from electrooptic modulator (102)
After incide dispersive optical fiber (103) in, photodetector (104) receives this light carrier and exports radiofrequency signal, and radiofrequency signal is entered
Enter the port 2 of vector network analyzer (105), be acquired by vector network analyzer (105) and analyzed, DFB laser to be measured
Device (101), electrooptic modulator (102), photodetector (104) constitutes a microwave photon link.
The measurement apparatus of Distributed Feedback Laser frequency noise the most according to claim 1, it is characterised in that also include being connected to
The DC source (106) of electrooptic modulator (102), DC source (106) is passed through in the operating point of described electrooptic modulator (102)
Regulate.
The measurement apparatus of Distributed Feedback Laser frequency noise the most according to claim 1, it is characterised in that the work of each optical device
Make wavelength to match with the fiber work wavelength of Distributed Feedback Laser to be measured (101).
The measurement apparatus of Distributed Feedback Laser frequency noise the most according to claim 1, it is characterised in that described Distributed Feedback Laser
The measuring process of the measurement apparatus of frequency noise is as follows:
First, in the case of not connecing dispersive optical fiber (103), the wavelength that Distributed Feedback Laser to be measured (101) exports is adjusted to λ0, use
Vector network analyzer (105) measures this microwave photon link in frequency f1The position at place is worth mutually, and carries out return-to-zero；
By an a length of L, abbe number be dispersive optical fiber (103) two ends of D be connected respectively to electrooptic modulator (102) output and
The input of photodetector (104)；
This microwave photon link is measured in microwave signal frequency f with vector network analyzer (105)1The maximum fluctuation of the position phase at place
Value φ；
Pass through formulaCalculate Distributed Feedback Laser to be measured (101) frequency noise Δ f.
The measurement apparatus of Distributed Feedback Laser frequency noise the most according to claim 4, it is characterised in that electrooptic modulator
(102) operating point is regulated by DC source (106), and the output voltage changing DC source (106) can change electric light
The offset operation point of manipulator (102), and then change the output intensity of electrooptic modulator (102).
The measurement apparatus of Distributed Feedback Laser frequency noise the most according to claim 4, it is characterised in that dispersive optical fiber (103)
Abbe number is more than 200ps/km/nm, and dispersive optical fiber length is more than 15km.
The measurement apparatus of Distributed Feedback Laser frequency noise the most according to claim 4, it is characterised in that electrooptic modulator
(102), the frequency response of photodetector (104) and vector network analyzer is more than 40GHz.
8. the side that the measurement apparatus of the Distributed Feedback Laser frequency noise that a kind uses described in any one of claim 1 to 7 measures
Method, it is characterised in that comprise the steps:
First, in the case of not connecing dispersive optical fiber (103), the wavelength that Distributed Feedback Laser to be measured (101) exports is adjusted to λ0, use
Vector network analyzer (105) measures this microwave photon link in frequency f1The position at place is worth mutually, and carries out return-to-zero；
By an a length of L, abbe number be dispersive optical fiber (103) two ends of D be connected respectively to electrooptic modulator (102) output and
The input of photodetector (104)；
This microwave photon link is measured in microwave signal frequency f with vector network analyzer (105)1The maximum fluctuation of the position phase at place
Value φ；
Pass through formulaCalculate Distributed Feedback Laser to be measured (101) frequency noise Δ f.
The measurement apparatus of Distributed Feedback Laser frequency noise the most according to claim 8, it is characterised in that electrooptic modulator
(102) operating point is regulated by DC source (106), and the output voltage changing DC source (106) can change electric light
The offset operation point of manipulator (102), and then change the output intensity of electrooptic modulator (102).
The measurement apparatus of Distributed Feedback Laser frequency noise the most according to claim 8, it is characterised in that dispersive optical fiber
(103) abbe number is more than 200ps/km/nm, and dispersive optical fiber length is more than 15km, electrooptic modulator (102), photodetector
And the frequency response of vector network analyzer (105) is more than 40GHz (104).
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| CN106940440A (en) * | 2017-03-22 | 2017-07-11 | 中国电子科技集团公司第三十八研究所 | A kind of complete transceiving integrated radar system of optical link gain and application method |
| CN107389317A (en) * | 2017-07-25 | 2017-11-24 | 苏州润桐专利运营有限公司 | A kind of measuring system of dispersive optical fiber abbe number |
| CN107727367A (en) * | 2017-10-12 | 2018-02-23 | 北京大学 | A kind of laser frequency noise measuring method and system |
| CN108344560A (en) * | 2018-02-07 | 2018-07-31 | 肖世涛 | A kind of measuring system of waveform frequency generator noise |
| CN108344559A (en) * | 2018-02-07 | 2018-07-31 | 肖世涛 | A kind of measurement method of waveform frequency generator noise |
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| CN106940440A (en) * | 2017-03-22 | 2017-07-11 | 中国电子科技集团公司第三十八研究所 | A kind of complete transceiving integrated radar system of optical link gain and application method |
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| CN107389317A (en) * | 2017-07-25 | 2017-11-24 | 苏州润桐专利运营有限公司 | A kind of measuring system of dispersive optical fiber abbe number |
| CN107727367A (en) * | 2017-10-12 | 2018-02-23 | 北京大学 | A kind of laser frequency noise measuring method and system |
| CN108344559A (en) * | 2018-02-07 | 2018-07-31 | 肖世涛 | A kind of measurement method of waveform frequency generator noise |
| CN108344560A (en) * | 2018-02-07 | 2018-07-31 | 肖世涛 | A kind of measuring system of waveform frequency generator noise |
| CN108344559B (en) * | 2018-02-07 | 2019-11-05 | 江苏源清环保科技有限公司 | A kind of measurement method of waveform frequency generator noise |
| CN108344560B (en) * | 2018-02-07 | 2019-12-13 | 抚州市东乡区东红光学科技有限公司 | measuring system for frequency noise of optical waveform generator |
| CN108955888A (en) * | 2018-08-28 | 2018-12-07 | 金陵科技学院 | A kind of full optical fiber interferometer Free Spectral Range measuring system and method |
| CN108955888B (en) * | 2018-08-28 | 2023-11-17 | 金陵科技学院 | System and method for measuring free spectral range of all-fiber interferometer |
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| CN114184356B (en) * | 2021-11-25 | 2024-01-09 | 苏州六幺四信息科技有限责任公司 | Nonlinear analysis method and nonlinear analysis device for photoelectric detector |
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