CN105890779A - Real-time wavelength calibration device and method for wavelength scanning system - Google Patents
Real-time wavelength calibration device and method for wavelength scanning system Download PDFInfo
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- CN105890779A CN105890779A CN201610415819.3A CN201610415819A CN105890779A CN 105890779 A CN105890779 A CN 105890779A CN 201610415819 A CN201610415819 A CN 201610415819A CN 105890779 A CN105890779 A CN 105890779A
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- 230000033228 biological regulation Effects 0.000 claims description 3
- 230000005622 photoelectricity Effects 0.000 claims description 2
- 238000004088 simulation Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
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Classifications
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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
Abstract
The invention provides a real-time wavelength calibration device and method for a wavelength scanning system. A scanning light source is connected with a 50/50 optical coupler through a single mode fiber to form a path; the 50/50 optical coupler is connected with an HCN air chamber through a single mode fiber to form a path; the HCN air chamber is connected with a photoelectric converter A through a single mode fiber to form a path; the 50/50 optical coupler is connected with a polarization controller through a single mode fiber to form a path; the polarization controller is connected with an F-P filter through a single mode fiber to form a path; the F-P filter is connected with a photoelectric converter B through a single mode fiber to form a path; the photoelectric converter A is connected with an I/V switching amplifier A through a leading wire to form a path; the I/V switching amplifier A is connected with a main amplifier A through a leading wire to form a path; the main amplifier A is connected with a data acquisition card through a leading wire to form a path; the photoelectric converter B is connected with an I/V switching amplifier B through a leading wire to form a path; a photoelectric conversion amplifier B is connected with a main amplifier B through a leading wire to form a path; the main amplifier B is connected with an analog-digital converter through a leading wire to form a path; the analog-digital converter is connected with the data acquisition card through a leading wire to form a path; a host computer is communicated with the card acquisition card through a cable.
Description
Technical field
The invention belongs to precision instrument technical field, be specifically related to a kind of real-time wavelength for length scanning system and demarcate dress
Put and scaling method.
Background technology
Along with the development of wavelength-division multiplex technique (WDM) in Fiber Optical Communication System, increasing the same of transmission signal bandwidth
Time, the interval also making transmission channel is more and more narrow, in order to avoid the signal generation crosstalk between each channel, thus shadow
Ring the quality of transmission signal, need the signal of band transmissions is effectively monitored, in order to improve the accurate of monitoring
Degree, needs to calibrate the wavelength of the instrument and equipment being monitored.Wavelength based on Fiber Bragg Grating FBG reflection peak moves
Dynamic Fibre Optical Sensor, the requirement to wavelength accuracy is the highest, in order to improve the certainty of measurement of Fibre Optical Sensor, needs
The wavelength of sensor is calibrated.The output wavelength of tunable laser due to by self and environmental disturbances, output
Wavelength there may be gap with the wavelength of theory setting, needs to carry out wavelength calibration and improves the standard of tunable laser output wavelength
Exactness.
Summary of the invention
The present invention is directed to the output wavelength of tunable laser owing to by self and environmental disturbances, the wavelength of output is with theoretical
The wavelength set there may be gap, needs to carry out wavelength calibration and improves the accuracy of tunable laser output wavelength, and then
A kind of real-time wavelength caliberating device for length scanning system and scaling method are provided.
It is an object of the invention to be achieved through the following technical solutions:
A kind of real-time wavelength caliberating device for length scanning system, including scanning light source, 50/50 photo-coupler,
HCN air chamber, optical-electrical converter A, I/V switching amplifier A, main amplifier A, Data Acquisition Card, host computer, simulation
Digital converter, main amplifier B, I/V switching amplifier B, optical-electrical converter B, F-P wave filter and Polarization Controller；
Between described scanning light source and 50/50 photo-coupler, between 50/50 photo-coupler and HCN air chamber, HCN air chamber with
Between optical-electrical converter A, between 50/50 photo-coupler and Polarization Controller, between Polarization Controller and F-P wave filter,
Between F-P wave filter and optical-electrical converter B, all connect into path by single-mode fiber；
Between described optical-electrical converter A and I/V switching amplifier A, between I/V switching amplifier A and main amplifier A, lead
Between amplifier A and Data Acquisition Card, between optical-electrical converter B and I/V switching amplifier B, photoelectric conversion amplifier B with
Between main amplifier B, between main amplifier B and analog-digital converter, analog-digital converter and Data Acquisition Card it
Between, all connect into path by wire；Host computer is connected with Data Acquisition Card by cable.
A kind of real-time wavelength scaling method for length scanning system, step is as follows:
Step (one), the data acquisition of real-time wavelength scaling method for length scanning system, including: scanning
The wavelength of the light that light source sends is between 1525nm～1565nm, and the light that scanning light source sends is divided by 50/50 photo-coupler
Becoming the equal two-beam signal of light intensity, wherein light beam signal is through HCN air chamber, optical signal in HCN air chamber by gas
Body molecule absorption, is converted to electric current, optical-electrical converter A (14) by the optical signal after absorbing through optical-electrical converter A
The electric current of output is converted to voltage through I/V switching amplifier A, the voltage that I/V switching amplifier A is exported by main amplifier A
Signal is amplified, and is acquired the analogue signal of voltage amplification by the sample rate of regulation Data Acquisition Card；Other one
Bundle optical signal first will be through a Polarization Control before the F-P wave filter of freedom of entry spectral region 1pm is filtered
Device, the polarization state of the optical signal through F-P wave filter is adjusted by Polarization Controller, make by F-P filter filtering it
After the luminous power of output signal reach maximum, the optical signal after F-P filter filtering is through optical-electrical converter
B is converted to electric current, is converted to voltage by I/V switching amplifier B, changes I/V switching amplifier B with main amplifier B
Voltage be amplified, with analog-digital converter, the analog voltage signal of amplification is converted to digit pulse, simulation numeral
The analog voltage signal amplified through main amplifier B is converted to digit pulse by transducer, uses Data Acquisition Card logarithm afterwards
Word pulse counts；The processing procedure of above two paths of signals is carried out simultaneously, the number that Data Acquisition Card gathers the most at last
According to being transferred to host computer；
Step (two), the data handling procedure of real-time wavelength scaling method for length scanning system, including: to warp
The data gathered after crossing HCN air chamber process, and first are fitted processing to the data gathered, simulate HCN gas
Each attenuation peak of body absorption line, uses Voigt curve to intend each attenuation peak of HCN gas absorption spectrum line
Closing, process the data gathered after F-P wave filter, the Free Spectral Range of F-P wave filter is 1pm, passes through
After F-P filter filtering each peak value of signal be spaced apart 1pm, owing to the live width of each crest of F-P is narrow, logical
Cross analog-digital converter, convert analog signals into digit pulse, search corresponding to each peak value by the way of counting
Time；The data acquisition of known above-mentioned two paths of signals is carried out simultaneously, and the signal wave through above-mentioned two-way is described
Length is consistent in time, after inserting F-P filtering between adjacent two attenuation peaks of HCN gas absorption spectrum line
Peak value spectral line, find and the peak of the first of HCN gas absorption spectrum line F-P that attenuation peak center is adjoining filtering
Value, is assigned to the peak value of neighbouring F-P filtering, by the centre wavelength corresponding to this HCN gas absorption spectrum line attenuation peak
Knowing this absolute wavelength values corresponding to F-P filter peak, F-P filter peak afterwards is successively at the base of this F-P filter peak
Increase the relative wavelength of 1pm on plinth, the accuracy that real-time wavelength is demarcated can be brought up to ± 1pm by which.
Beneficial effects of the present invention:
1, HCN air chamber and F-P is used to filter the mode combined, at two adjacent absolute ripples that HCN air chamber is demarcated
Insert the relative wavelength being spaced apart 1pm between length, the accuracy of Wavelength calibration is brought up to ± 1pm.
2, before the signal after filtering F-P carries out digital collection, the mode of Analog-digital Converter is used, will simulation
Signal is converted to rapid pulse punching, by the way of employing counts, and the sampling that after determining F-P filtering, each peak curve is corresponding
Time, improve the accuracy of the real-time relative wavelength that F-P wave filter is demarcated.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of real-time wavelength caliberating device for length scanning system.
Fig. 2 is analog-digital converter fundamental diagram.
Fig. 3 is the data handling procedure figure of a kind of real-time wavelength scaling method for length scanning system.
Fig. 4 is the HCN gas absorption spectrum line standard spectrum line chart after normalization.
Fig. 5 is the process chart of a kind of real-time wavelength scaling method for length scanning system.
Reference in figure: 11 is scanning light source, 12 is 50/50 photo-coupler, and 13 is HCN air chamber, and 14 is photoelectricity
Transducer A, 15 is I/V transducer A, and 16 is main amplifier A, and 17 is Data Acquisition Card, and 18 is host computer, and 19 is mould
Intending digital converter, 110 is main amplifier B, and 111 is I/V transducer B, and 112 is optical-electrical converter B, and 113 filter for F-P
Ripple device, 114 is Polarization Controller, and 21 is the analogue signal after F-P filters, and 22 is the simulation letter after F-P filtering
Number through the digital pulse signal of analog-digital converter output, 31 be neighbouring with first attenuation peak of HCN F-P filtering peak
Value, 32 is the F-P filter peak inserted between adjacent two attenuation peaks of HCN gas absorption spectrum line, and 33 is the HCN of matching
Adjacent two attenuation peaks of gas absorption spectrum.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail: the present embodiment is being front with technical solution of the present invention
Put and implement, give detailed embodiment, but protection scope of the present invention is not limited to following embodiment.
As it is shown in figure 1, a kind of real-time wavelength caliberating device for length scanning system involved by the present embodiment, including
Scanning light source (11), 50/50 photo-coupler (12), HCN air chamber (13), optical-electrical converter A (14), I/V
Switching amplifier A (15), main amplifier A (16), Data Acquisition Card (17), host computer (18), simulation number
Word transducer (19), main amplifier B (110), I/V switching amplifier B (111), optical-electrical converter B
(112), F-P wave filter (113) and Polarization Controller (114)；
Between described scanning light source (11) and 50/50 photo-coupler (12), 50/50 photo-coupler (12) and HCN gas
Between room (13), between HCN air chamber (13) and optical-electrical converter A (14), 50/50 photo-coupler (12) with
Between Polarization Controller (114), between Polarization Controller (114) and F-P wave filter (113), F-P wave filter
(113) and between optical-electrical converter B (112), all path is connected into by single-mode fiber；
Between described optical-electrical converter A (14) and I/V switching amplifier A (15), I/V switching amplifier A (15) with
Between main amplifier A (16), between main amplifier A (16) and Data Acquisition Card (17), optical-electrical converter B
(112) and between I/V switching amplifier B (111), photoelectric conversion amplifier B (111) and main amplifier B
(110) between, between main amplifier B (110) and analog-digital converter (19), analog-digital converter
(19) and between Data Acquisition Card (17), all path is connected into by wire；
Host computer (18) is connected with Data Acquisition Card (17) by cable.
As shown in Fig. 2～Fig. 5, a kind of real-time wavelength scaling method for length scanning system involved by the present embodiment,
Step is as follows:
Step (one), the data acquisition of real-time wavelength scaling method for length scanning system, including: scanning
The wavelength of the light that light source (11) sends is between 1525nm～1565nm, and scanning light source (11) is with certain scanning
The light of speed output continuous wavelength, the light that scanning light source (11) sends is divided into light intensity phase by 50/50 photo-coupler (12)
Deng two-beam signal, wherein light beam signal is through HCN air chamber (13), and optical signal is in HCN air chamber (13)
By gas molecules sorb, be converted to electric current, opto-electronic conversion by the optical signal after absorbing through optical-electrical converter A (14)
The electric current that device A (14) exports is converted to voltage through I/V switching amplifier A (15), and main amplifier A (16) is main
It is that the voltage signal exporting I/V switching amplifier A (15) is amplified, by adopting of regulation Data Acquisition Card (17)
The analogue signal of voltage amplification is acquired by sample rate.Due to F-P wave filter (113) be one to Polarization-Sensitive device
Part, additionally light beam signal first will be through before the F-P wave filter (113) of freedom of entry spectral region 1pm is filtered
Crossing a Polarization Controller (114), the major function of Polarization Controller (114) is to through F-P wave filter (113)
The polarization state of optical signal be adjusted, make the luminous power of the output signal after being filtered by F-P wave filter (113) reach
To maximum, the optical signal after F-P wave filter (113) filters is converted to through optical-electrical converter B (112)
Electric current, is converted to voltage by I/V switching amplifier B (111), with main amplifier B (110) to I/V switching amplifier
The voltage that B (111) changes is amplified, the analog voltage signal conversion will amplified with analog-digital converter (19)
For digit pulse, concrete transformation process is as in figure 2 it is shown, the major function of analog-digital converter (19) is to pass through
The analog voltage signal (21) that main amplifier B (110) amplifies is converted to digit pulse (22), adopts by numeral afterwards
Digit pulse (22) is counted by truck (17).The processing procedure of above two paths of signals is carried out simultaneously, numeral
The data that capture card gathers the most at last are transferred to host computer (18).
Step (two), the data handling procedure of real-time wavelength scaling method for length scanning system, comprising: right
The data gathered after HCN air chamber process, and according to the function of HCN air chamber, HCN gas molecule is the most right
The light signal energy of specific wavelength absorbs, and the degree of different wave length position optical power attenuation is different, and Fig. 4 is given
After HCN air chamber, the decline degree after the wavelength location of optical power down and normalization, by GAS ABSORPTION in figure
Each attenuation peak afterwards is numbered, and is divided into two parts of R and P, each ripple corresponding to attenuation peak center
Length can by 1 acquisition of tabling look-up,
Table 1
This function according to HCN air chamber, it is necessary first to be fitted processing to the data gathered, simulate HCN gas
Each attenuation peak of absorption line, uses Voigt curve to be fitted each attenuation peak of HCN gas absorption spectrum line,
Attenuation peak after matching is contrasted with the gas absorption spectrum line in Fig. 4, finds the volume corresponding to respective attenuation peak
Number, 1 i.e. may know that the wavelength corresponding to this attenuation peak center by tabling look-up, by searching adopting corresponding to attenuation peak center
Sampling point, understands the sampling time corresponding to this sampled point according to sample rate, it is known that the wavelength corresponding to attenuation peak center and adopting
The sample time, can realize scanning light source (11) is carried out real-time calibration.The data gathered after F-P wave filter are entered
Row processes, and the Free Spectral Range of F-P wave filter is 1pm, after F-P filter filtering between each peak value of signal
It is divided into 1pm, owing to the live width of each crest of F-P is narrow, analog-digital converter can be passed through, by analogue signal
Be converted to digit pulse, by the way of counting, search the time corresponding to each peak value.The number of known above-mentioned two paths of signals
Carry out according to gatherer process simultaneously, illustrate through the signal wavelength of above-mentioned two-way be consistent in time, by
Insert the peak value spectral line (32) after F-P filtering between adjacent two attenuation peaks (33) of HCN gas absorption spectrum line, look for
To the peak value with the first of HCN gas absorption spectrum line the F-P that attenuation peak center is adjoining filtering, by this HCN gas
Centre wavelength corresponding to body absorption line attenuation peak is assigned to the peak value of neighbouring F-P filtering, it is known that this F-P filter peak
Corresponding absolute wavelength values, F-P filter peak afterwards increases the phase of 1pm successively on the basis of this F-P filter peak
To wavelength, the accuracy that real-time wavelength is demarcated can be brought up to ± 1pm by which.For length scanning system
The work process of real-time wavelength caliberating device, can as it is shown in figure 5, by the way of HCN air chamber and F-P filter and combine
To obtain being spaced apart the real-time absolute wavelength values of 1pm, by each point-rendering corresponding with wavelength for the time that obtains is arrived
With the time as abscissa, absolute wavelength is in the plane coordinate system of vertical coordinate, is connected by each point in figure with broken line
Coming, detailed process is as it is shown in figure 5, real-time absolute wavelength values that as can be seen from the figure scanning light source (11) exports.
The above, the only present invention preferably detailed description of the invention, it is whole that these detailed description of the invention are all based on the present invention
Different implementations under body design, and protection scope of the present invention is not limited thereto, and any is familiar with the art
Technical staff in the technical scope that the invention discloses, the change that can readily occur in or replacement, all should contain in the present invention
Protection domain within.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (3)
1. for a real-time wavelength caliberating device for length scanning system, including scanning light source (11), 50/50 optocoupler
Clutch (12), HCN air chamber (13), optical-electrical converter A (14), I/V switching amplifier A (15), main amplification
Device A (16), Data Acquisition Card (17), host computer (18), analog-digital converter (19), main amplifier B
(110), I/V switching amplifier B (111), optical-electrical converter B (112), F-P wave filter (113) and polarization
Controller (114)；It is characterized in that,
Between described scanning light source (11) and 50/50 photo-coupler (12), 50/50 photo-coupler (12) and HCN gas
Between room (13), between HCN air chamber (13) and optical-electrical converter A (14), 50/50 photo-coupler (12) with
Between Polarization Controller (114), between Polarization Controller (114) and F-P wave filter (113), F-P wave filter
(113) and between optical-electrical converter B (112), all path is connected into by single-mode fiber；
Between described optical-electrical converter A (14) and I/V switching amplifier A (15), I/V switching amplifier A (15) with
Between main amplifier A (16), between main amplifier A (16) and Data Acquisition Card (17), optical-electrical converter B
(112) and between I/V switching amplifier B (111), photoelectric conversion amplifier B (111) and main amplifier B
(110) between, between main amplifier B (110) and analog-digital converter (19), analog-digital converter
(19) and between Data Acquisition Card (17), all path is connected into by wire；
Host computer (18) is connected with Data Acquisition Card (17) by cable.
2. use a scaling method for the real-time wavelength caliberating device for length scanning system of claim 1, its
It is characterised by,
Step (one), the data acquisition of real-time wavelength scaling method for length scanning system, including: scanning
The wavelength of the light that light source (11) sends between 1525nm～1565nm, the light quilt that scanning light source (11) sends
50/50 photo-coupler (12) is divided into the two-beam signal that light intensity is equal, and wherein light beam signal is through HCN air chamber
(13), optical signal in HCN air chamber (13) by gas molecules sorb, by the optical signal after absorbing through photoelectricity
Transducer A (14) is converted to electric current, and the electric current that optical-electrical converter A (14) exports is through I/V switching amplifier A
(15) being converted to voltage, the voltage signal that I/V switching amplifier A (15) is exported by main amplifier A (16) is put
Greatly, by the sample rate of regulation Data Acquisition Card (17), the analogue signal of voltage amplification is acquired；Additionally light beam
Signal first will be through a Polarization Control before the F-P wave filter (113) of freedom of entry spectral region 1pm is filtered
Device (114), the polarization state of the optical signal through F-P wave filter (113) is adjusted by Polarization Controller (114),
The luminous power making the output signal after being filtered by F-P wave filter (113) reaches maximum, through F-P wave filter
(113) optical signal after filtering is converted to electric current through optical-electrical converter B (112), by I/V switching amplifier B
(111) being converted to voltage, the voltage changed I/V switching amplifier B (111) with main amplifier B (110) is carried out
Amplify, with analog-digital converter (19), the analog voltage signal of amplification is converted to digit pulse, Analog-digital Converter
The analog voltage signal (21) amplified through main amplifier B (110) is converted to digit pulse by device (19)
(22), with Data Acquisition Card (17), digit pulse (22) is counted afterwards；The process of above two paths of signals
Journey is carried out simultaneously, and the data that Data Acquisition Card gathers the most at last are transferred to host computer (18)；
Step (two), the data handling procedure of real-time wavelength scaling method for length scanning system, including: to warp
The data gathered after crossing HCN air chamber process, and first are fitted processing to the data gathered, simulate HCN gas
Each attenuation peak of body absorption line, uses Voigt curve to intend each attenuation peak of HCN gas absorption spectrum line
Closing, process the data gathered after F-P wave filter, the Free Spectral Range of F-P wave filter is 1pm, passes through
After F-P filter filtering each peak value of signal be spaced apart 1pm, owing to the live width of each crest of F-P is narrow, logical
Cross analog-digital converter, convert analog signals into digit pulse, search corresponding to each peak value by the way of counting
Time；The data acquisition of known above-mentioned two paths of signals is carried out simultaneously, and the signal wave through above-mentioned two-way is described
Length is consistent in time, filters by inserting F-P between adjacent two attenuation peaks (33) of HCN gas absorption spectrum line
Peak value spectral line (32) after ripple, finds adjoining with the first of HCN gas absorption spectrum line attenuation peak center
The peak value of F-P filtering, the centre wavelength corresponding to this HCN gas absorption spectrum line attenuation peak is assigned to neighbouring F-P filter
The peak value of ripple, it is known that this absolute wavelength values corresponding to F-P filter peak, F-P filter peak afterwards is successively at this F-P
Increase the relative wavelength of 1pm on the basis of filter peak, the accuracy that real-time wavelength is demarcated can be improved by which
To ± 1pm.
Real-time wavelength scaling method for length scanning system the most according to claim 2, it is characterised in that
With the analog-digital converter (19) in step (), analogue signal (21) is converted to digit pulse (22)；
Taking the voltage corresponding to F-P filter peak centre position is standard, when the voltage of digital collection is less than this voltage, and level
Being set to 0, during higher than this voltage, level is set to 1.
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| CN110702236A (en) * | 2019-11-08 | 2020-01-17 | 中国计量科学研究院 | High-precision spectrum calibration method for optical fiber wavelength standard device |
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