CN109932163A - A kind of device and method of noise testing fibre optic interferometer self-assessment - Google Patents
A kind of device and method of noise testing fibre optic interferometer self-assessment Download PDFInfo
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- CN109932163A CN109932163A CN201910287856.4A CN201910287856A CN109932163A CN 109932163 A CN109932163 A CN 109932163A CN 201910287856 A CN201910287856 A CN 201910287856A CN 109932163 A CN109932163 A CN 109932163A
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Abstract
The present invention discloses a kind of device of noise testing fibre optic interferometer self-assessment, including internal modulation semiconductor DFB, laser driving temperature control circuit board, modulated signal generate template, 120 degree of difference fibre optic interferometers and data acquisition and procession module；The internal modulation semiconductor DFB includes driving current input terminal, temperature control voltage input end, modulated signal input terminal and light output end；The laser drives temperature control circuit board output driving current and temperature control voltage to the driving current input terminal and temperature control voltage input end of internal modulation semiconductor DFB；The modulated signal generation module generates the identical modulation intelligence of two-way, and first via modulation intelligence inputs the modulated signal input terminal of internal modulation semiconductor DFB, the acquisition of the second road modulation intelligence input data and processing module；The present invention carries out the assessment that noise testing demodulates correctness with optical fiber interferometer phase, convenient for forming a correct judgement to test result.
Description
Technical field
The invention belongs to the technical fields of optical fiber, and in particular to a kind of dress of noise testing fibre optic interferometer self-assessment
It sets and method.
Background technique
It wants the fields such as coherent laser detection, coherent laser communication are all with higher to the phase noise characteristic of laser
It asks, to guarantee the realization of coherence.The phase noise characteristic of laser mainly uses phase noise, frequency noise, phase noise function
The physical quantitys such as rate spectrum density, frequency noise power spectral density, line width characterize, and the accurate test to these physical quantitys is always one
A very crucial problem in the research and development of low noise narrow linewidth laser, production and the design of subsequent applications system and integrates
It all has very important significance in the process.
In order to solve this problem, the researcher of Shanghai Optics and Precision Mechanics institute, Chinese Academy of Sciences proposes based on 3
The measuring technology of difference interference and the power spectral density estimation of × 3 couplers, for example " laser noise is special for Chinese invention patent
The measuring device (ZL201110172609.3) of property " (prior art one).The core of this method is to propose to utilize 3 × 3 couplings
120 degree of the three tunnel difference fibre optic interferometer that device is formed avoids 2 × 2 conventional couplings in this way by increasing interference fringe all the way
The interference fading problem that device interferometer occurs, so that all at least two groups of interference fringes carry phase noise information to any time,
So as to realize steady phase frequency noise and line width test at any time.The first technology only provides the calibration of instrumental constant
Method, but the appraisal procedure of measurement result correctness is not provided clearly.
The prior art two: Dan Xu, Fei Yang, Dijun Chen, Fang Wei, Haiwen Cai, Zujie
Fang, Ronghui Qu. Laser phase and frequency noise measurement by Michelson
interferometer composed of a 3×3 optical fiber coupler [J]. Optics Express,
2015,23 (17): 22386-22393. is proposed to be modulated to form known phase using an electrooptic modulator to certain laser
The laser of position modulation voltage, then the amount of phase modulation on the laser is demodulated with the noise testing mode of first technology one, if demodulation
Modulation size out is consistent with known dimensions, then illustrates that noise testing process is correct.The first technology utilizes electrooptic effect,
Whole process accurate and effective, but since electrooptic modulator will receive the influence of the external environments such as temperature, so consistency is poor,
Be not suitable for using when temperature environment changes greatly ground, while electrooptic modulator price is more expensive, entire method higher cost,
Also it is not easy to integrate.
Summary of the invention
Goal of the invention: present invention aims in view of the deficiencies of the prior art, provide a kind of noise testing fiber optic interferometric
The device of instrument self-assessment, the present invention pass through the current-modulation effect of internal modulation semiconductor DFB, form known phase tune
The laser of amount processed is assessed for the demodulation correctness to fibre optic interferometer.
Technical solution: a kind of device of noise testing fibre optic interferometer self-assessment of the present invention, including internal modulation
Semiconductor DFB, laser driving temperature control circuit board, modulated signal generate template, 120 degree of difference fibre optic interferometers and
Data acquisition and procession module；The internal modulation semiconductor DFB includes driving current input terminal, temperature control voltage input
End, modulated signal input terminal and light output end；The laser driving temperature control circuit board output driving current and temperature control
Driving current input terminal and temperature control voltage input end of the voltage to internal modulation semiconductor DFB；The modulated signal generates
Module generates the identical modulation intelligence of two-way, and first via modulation intelligence inputs the modulation of internal modulation semiconductor DFB
Signal input part, the acquisition of the second road modulation intelligence input data and processing module, obtain the after the processing of its data processing software
One group of phase-modulation waveform；The light output end of the internal modulation semiconductor DFB accesses 120 degree of difference fibre optic interferometers,
120 degree of difference fibre optic interferometers are passed through by the acquisition of voltage signal input data and processing module after photoelectric conversion
Demodulation obtains second group of phase-modulation waveform after the data processing software processing of data acquisition and procession module.
Preferably, the internal modulation semiconductor DFB is 1752 models of emcore company, and modulated signal is by modulating
Signal input part input, rather than be added inside driving current input terminal, primarily to it is non-to avoid driving current from modulating
The limitation of linear and bandwidth.
Preferably, the modulated signal generation module is commercial signal projector, and the signal projector generates two-way
Identical modulated signal, modulation function are triangular wave, and frequency is set as 1MHz, amplitude 1V.
A method of noise testing fibre optic interferometer self-assessment being carried out using devices discussed above, including as follows
Step:
1) it is powered on to laser driving temperature control circuit board, makes internal modulation semiconductor DFB the operation is stable, export normal function
Rate；
2) it generates template to modulated signal to power on, and it is triangular wave that its modulation function, which is arranged, frequency is set as 1MHz, and amplitude is
1V；
3) data processing software for opening data acquisition and procession module, records two groups of phase-modulation waveforms i.e. first group of phase tune
Waveform processed and second group of phase-modulation waveform；
4) to two groups of phase-modulation waveforms, judge whether the two is consistent, if the two is consistent, illustrates noise testing optical fiber
The phase demodulating of interferometer is correctly, to can be used for phase noise test, otherwise demodulation is incorrect, it is impossible to be used in phase is made an uproar
Sound test；
5) step 2-4 is repeated, changing modulation function is square wave or sine wave, or changes the frequency of sine wave, other can be obtained
Whether fibre optic interferometer phase demodulating is correctly assessed under modulation case.
The utility model has the advantages that (1) present invention, compared with the existing technology in one, the present invention can carry out noise testing fiber optic interferometric
The assessment of instrument phase demodulating correctness, convenient for forming a correct judgement to test result；
(2) for the present invention compared with the existing technology in two, the present invention directly utilizes the current-modulation of internal modulation semiconductor DFB
The laser of known phase modulation voltage is formed, is not influenced by environment such as ambient temperature variations, there is preferably robustness, do not need light
Electric modulator, cost are lower.
Detailed description of the invention
Fig. 1 is the structural block diagram of device of the present invention.
Wherein, 1- internal modulation semiconductor DFB；2- laser drives temperature control circuit board；3- modulated signal generates mould
Block；4-120 degree differs fibre optic interferometer；5- data acquisition and procession module；First group of phase-modulation waveform of 6-；Second group of phase of 7-
Position modulation waveform.
Specific embodiment
Technical solution of the present invention is described in detail below by attached drawing, but protection scope of the present invention is not limited to
The embodiment.
Embodiment: a kind of device of noise testing fibre optic interferometer self-assessment, including internal modulation Semiconductor DFB Laser
Device 1, laser driving temperature control circuit board 2, modulated signal generates template, 120 degree difference fibre optic interferometers 4 and data acquire and
Processing module 5；The internal modulation semiconductor DFB 1 is 1752 models of emcore company, and modulated signal is by modulated signal
Input terminal input, rather than be added inside driving current input terminal, primarily to it is non-linear to avoid driving current from modulating
It is limited with bandwidth；The internal modulation semiconductor DFB 1 includes driving current input terminal, temperature control voltage input end, modulation letter
Number input terminal and light output end；Laser driving 2 output driving current of temperature control circuit board and temperature control voltage are to interior
Modulate the driving current input terminal and temperature control voltage input end of semiconductor DFB 1；The modulated signal generation module 3 is
Commercial signal projector, the signal projector generate the identical modulated signal of two-way, and modulation function is triangular wave,
Frequency is set as 1MHz, amplitude 1V, and the modulated signal generation module 3 generates the identical modulation intelligence of two-way, and first
Road modulation intelligence inputs the modulated signal input terminal of internal modulation semiconductor DFB 1, and the second road modulation intelligence input data is adopted
Collection and processing module 5 obtain first group of phase-modulation waveform 6 after the processing of its data processing software；The internal modulation semiconductor
The light output end of Distributed Feedback Laser 1 accesses 120 degree of difference fibre optic interferometers 4, and 120 degree of difference fibre optic interferometers 4 pass through photoelectricity
The acquisition of voltage signal input data and processing module 5 after conversion, and the data processing through data acquisition and procession module 5 is soft
Demodulation obtains second group of phase-modulation waveform 7 after part processing.
The first group of phase-modulation waveform 6 and second group of phase of its acquisition are compared inside data acquisition and procession module 5
Modulation waveform 7 illustrates that the phase demodulating of noise testing fibre optic interferometer is correctly, to can be used for if the two is consistent
Phase noise test, otherwise demodulates incorrect, it is impossible to be used in phase noise test.
Modulated signal generation module 3 in the present invention is also possible to homemade letter either commercial signal projector
Number generation circuit plate, the identical modulated signal of the two-way of generation, modulation function includes triangular wave, square wave, sine wave etc.
Typical modulation function form, frequency or period can be any given, if data acquisition and procession module 5 bandwidth it
Interior, amplitude is given by the modulation parameter of internal modulation semiconductor DFB 1, is given by specific selected laser device.
A method of noise testing fibre optic interferometer self-assessment being carried out using devices discussed above, including as follows
Step:
1) it is powered on to laser driving temperature control circuit board 2, makes 1 the operation is stable of internal modulation semiconductor DFB, output is normal
Power；
2) it generates template to modulated signal to power on, and it is triangular wave that its modulation function, which is arranged, frequency is set as 1MHz, and amplitude is
1V；
3) data processing software for opening data acquisition and procession module 5, records two groups of phase-modulation waveforms i.e. first group of phase
Modulation waveform 6 and second group of phase-modulation waveform 7；
4) to two groups of phase-modulation waveforms, judge whether the two is consistent, if the two is consistent, illustrates noise testing optical fiber
The phase demodulating of interferometer is correctly, to can be used for phase noise test, otherwise demodulation is incorrect, it is impossible to be used in phase is made an uproar
Sound test；
5) step 2-4 is repeated, changing modulation function is square wave or sine wave, or changes the frequency of sine wave, other can be obtained
Whether fibre optic interferometer phase demodulating is correctly assessed under modulation case.
As described above, must not be explained although the present invention has been indicated and described referring to specific preferred embodiment
For the limitation to invention itself.It without prejudice to the spirit and scope of the invention as defined in the appended claims, can be right
Various changes can be made in the form and details for it.
Claims (4)
1. a kind of noise testing device of fibre optic interferometer self-assessment, it is characterised in that: swash including internal modulation Semiconductor DFB
Light device, laser driving temperature control circuit board, modulated signal generates template, 120 degree difference fibre optic interferometers and data acquire and
Processing module；The internal modulation semiconductor DFB includes driving current input terminal, temperature control voltage input end, modulated signal
Input terminal and light output end；The laser driving temperature control circuit board output driving current and temperature control voltage are to internal modulation
The driving current input terminal and temperature control voltage input end of semiconductor DFB；The modulated signal generation module generates two-way
Identical modulation intelligence, first via modulation intelligence input the modulated signal input terminal of internal modulation semiconductor DFB, the
The acquisition of two road modulation intelligence input datas and processing module obtain first group of phase-modulated wave after the processing of its data processing software
Shape；The light output end of the internal modulation semiconductor DFB accesses 120 degree of difference fibre optic interferometers, 120 degree of differences light
Fine interferometer passes through the acquisition of voltage signal input data and processing module after photoelectric conversion, and through data acquisition and procession mould
Demodulation obtains second group of phase-modulation waveform after the data processing software processing of block.
2. a kind of device of noise testing fibre optic interferometer self-assessment according to claim 1, it is characterised in that: institute
1752 models that internal modulation semiconductor DFB is emcore company are stated, modulated signal is inputted by modulated signal input terminal.
3. a kind of device of noise testing fibre optic interferometer self-assessment according to claim 1, it is characterised in that: institute
Stating modulated signal generation module is commercial signal projector, and the signal projector generates the identical modulation letter of two-way
Number, modulation function is triangular wave, and frequency is set as 1MHz, amplitude 1V.
4. a kind of method for carrying out noise testing fibre optic interferometer self-assessment using device described in claim 1, special
Sign is: including the following steps:
1) it is powered on to laser driving temperature control circuit board, makes internal modulation semiconductor DFB the operation is stable, export normal function
Rate；
2) it generates template to modulated signal to power on, and it is triangular wave that its modulation function, which is arranged, frequency is set as 1MHz, and amplitude is
1V；
3) data processing software for opening data acquisition and procession module, records two groups of phase-modulation waveforms i.e. first group of phase tune
Waveform processed and second group of phase-modulation waveform；
4) to two groups of phase-modulation waveforms, judge whether the two is consistent, if the two is consistent, illustrates noise testing optical fiber
The phase demodulating of interferometer is correctly, to can be used for phase noise test, otherwise demodulation is incorrect, it is impossible to be used in phase is made an uproar
Sound test；
5) step 2-4 is repeated, changing modulation function is square wave or sine wave, or changes the frequency of sine wave, other can be obtained
Whether fibre optic interferometer phase demodulating is correctly assessed under modulation case.
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Cited By (4)
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| CN111256955A (en) * | 2020-01-19 | 2020-06-09 | 北京理工大学 | Optical coherent system performance evaluation method based on laser frequency noise spectrum |
| CN113049227A (en) * | 2021-03-15 | 2021-06-29 | 深圳市杰普特光电股份有限公司 | Laser wavelength modulation measuring device and measuring method and measuring system thereof |
| CN114487478A (en) * | 2022-01-26 | 2022-05-13 | 西安交通大学 | MOEMS acceleration sensor system based on quadrature carrier modulation |
| CN117030207A (en) * | 2023-08-25 | 2023-11-10 | 茂莱（南京）仪器有限公司 | Automatic quality evaluation method, device, equipment and medium for laser interferometer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113049227B (en) * | 2021-03-15 | 2024-04-02 | 深圳市杰普特光电股份有限公司 | Laser wavelength modulation measuring device, measuring method and measuring system thereof |
| CN114487478A (en) * | 2022-01-26 | 2022-05-13 | 西安交通大学 | MOEMS acceleration sensor system based on quadrature carrier modulation |
| CN117030207A (en) * | 2023-08-25 | 2023-11-10 | 茂莱（南京）仪器有限公司 | Automatic quality evaluation method, device, equipment and medium for laser interferometer |
| CN117030207B (en) * | 2023-08-25 | 2024-03-08 | 茂莱（南京）仪器有限公司 | Automatic quality evaluation method, device, equipment and medium for laser interferometer |
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Application publication date: 20190625 |