CN110275292B - Drive voltage optimization method for tunable Fabry-Perot filter - Google Patents
Drive voltage optimization method for tunable Fabry-Perot filter Download PDFInfo
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- CN110275292B CN110275292B CN201910541847.3A CN201910541847A CN110275292B CN 110275292 B CN110275292 B CN 110275292B CN 201910541847 A CN201910541847 A CN 201910541847A CN 110275292 B CN110275292 B CN 110275292B
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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Abstract
The invention relates to a tunable Fabry-Perot filter driving voltage optimization method, which comprises the steps of converting the rising part voltage of the traditional alternating current driving voltage into a plurality of gradually increased direct current voltage sections, searching the optimal segmented direct current voltage duration time through a particle swarm algorithm, and obtaining the optimized direct current voltage; the center position of a reflection peak obtained by scanning the traditional alternating voltage drive is converted into the center position of the response of the adjustable filter under the optimized direct voltage, and the final alternating current and direct current drive voltage is obtained. The voltage-wavelength nonlinearity of the tunable Fabry-Perot filter is effectively compensated, any hardware equipment is not required to be added, and only a digital compensation mode is adopted to correct the alternating current driving voltage, so that the nonlinearity of the filter is compensated. The method has the advantages of low cost, strong portability and high reliability.
Description
Technical Field
The invention relates to a fiber Bragg grating sensing demodulation technology, in particular to a tunable Fabry-Perot filter driving voltage optimization method based on a particle swarm optimization.
Background
The present method for compensating the nonlinearity of the tunable fabry-perot filter mainly uses a reference grating or a fabry-perot etalon to obtain a reference wavelength, so as to suppress the wavelength-voltage nonlinearity of the tunable fabry-perot filter. The reference grating occupies a limited bandwidth, resulting in bandwidth waste. Fabry-perot etalons are expensive and add significantly to the cost of the measurement system.
Disclosure of Invention
The invention provides a method for optimizing drive voltage of a tunable Fabry-Perot filter, which aims at solving the problems of a common method for nonlinear compensation of the tunable Fabry-Perot filter.
The technical scheme of the invention is as follows: a tunable Fabry-Perot filter driving voltage optimization method comprises the steps of converting a rising part of voltage in a traditional alternating current driving voltage into a plurality of gradually increasing direct current voltage sections, and searching for optimal segmented direct current voltage duration time through a particle swarm algorithm to obtain optimized direct current voltage; the center position of a reflection peak obtained by scanning the traditional alternating voltage drive is converted into the center position of the response of the adjustable filter under the optimized direct voltage, and the final alternating current and direct current drive voltage is obtained.
The method comprises the following specific steps of obtaining the optimized direct current voltage: and changing the duration time of each segmented direct-current voltage in the direct-current voltage, recording the deviation between the true value and the theoretical strain value under different conditions, and searching each corresponding segment of direct-current voltage duration time combination under the condition of minimum deviation through a particle swarm algorithm.
The true value is obtained by calculating through a strain measurement experiment of a suspended weight, and the specific measurement method is as follows: the fiber Bragg grating with the minimum characteristic wavelength is used as a reference grating, the fiber Bragg grating with the maximum characteristic wavelength is used as a sensing grating, the maximum wavelength drift difference is formed between the fiber Bragg grating with the minimum characteristic wavelength and the fiber Bragg grating with the maximum characteristic wavelength under the alternating current driving voltage, the fiber Bragg grating is vertically fixed in the experiment, and the axial stress is applied to the fiber Bragg grating with the maximum characteristic wavelength through a hanging weight; the wavelength drift of the grating with the minimum characteristic wavelength and the maximum characteristic wavelength generated under the axial stress is measured by an Agilent 8164B tunable laser; the theoretical strain value caused by the weight of the weight is calculated by the following three formulas
Wherein, Delta epsilon is a strain value, Delta F is the normal stress of the optical fiber, Delta A is the stress area of the optical fiber, and E represents the Young modulus of No. 45 alloy steel; d represents the diameter of the optical fiber; Δ m represents the total weight of the weight applied to the fiber, g represents the acceleration rate of gravity, and g is 9.8m/s2。
The tunable Fabry-Perot filter driving voltage optimization method obtains the relative nonlinearity degree of alternating current voltage by measuring the grating wavelength change under the optimized direct current voltage and the grating wavelength change under the traditional alternating current voltage; and converting the central position of the grating wavelength under the traditional alternating voltage into the central position under the optimized direct voltage through polynomial fitting, and calculating to obtain an alternating current-direct current voltage correction curve for driving the tunable optical filter.
The invention has the beneficial effects that: the tunable Fabry-Perot filter driving voltage optimization method does not need to add any hardware equipment, and only adopts a digital compensation mode to correct the alternating current driving voltage so as to compensate the nonlinearity of the filter. The invention has low cost, strong portability and high reliability.
Drawings
FIG. 1 is a schematic diagram of a fiber Bragg grating wavelength demodulation system based on a tunable Fabry-Perot filter;
FIG. 2 is a diagram of the original AC driving voltage;
FIG. 3 is a diagram of the AC/DC driving voltage composed of the multi-step DC voltage according to the present invention.
Detailed Description
As shown in fig. 1, the schematic diagram of a fiber bragg grating wavelength demodulation system based on a tunable fabry-perot filter is that an amplified spontaneous emission light source is used as a light source of a fiber bragg grating sensing system, light output by the light source enters a fiber bragg grating array after passing through a coupler, reflected light enters a tuning optical filter after passing through the coupler again, then enters a data acquisition element, and finally data processing is performed by a computer. The voltage output by the analog output port of the data acquisition element is amplified and then used for driving the tunable optical filter. When the tunable optical filter continuously changes the transmission position under the drive of voltage, the reflection spectrums of all the gratings can be dynamically collected, and the simultaneous detection of a plurality of strain parameters is realized.
Converting the rising partial voltage in the traditional alternating current driving voltage (as shown in fig. 2) into a plurality of gradually-increased direct current voltage segments, combining the alternating current and direct current driving voltage combined with the alternating current and direct current as shown in fig. 3, and searching the optimal segmented direct current voltage duration time through a particle swarm algorithm to obtain the optimized direct current voltage; the center position of a reflection peak obtained by scanning the traditional alternating voltage drive is converted into the center position of the response of the adjustable filter under the optimized direct voltage, and the final drive voltage is obtained. The method comprises the following specific steps:
1. the traditional alternating voltage continuously drives the filter to work, and the center position of each grating reflection peak value is recorded.
2. A slow multi-step-up of the dc voltage is applied to the filter. The range of the plurality of dc voltage segments completely includes the ac voltage range. This multi-step increase in dc voltage corresponds to a slowly stepped-up rising edge of the ac voltage. The center position of the grating reflection peak in the process driven by the direct current voltage is recorded.
3. The duration time of each segmented direct-current voltage in the direct-current voltage is changed randomly, the deviation between the measured real value obtained by the Agilent 8164B tunable laser and the theoretical strain value obtained by theoretical derivation in a weight suspension experiment under different conditions is recorded, and each segment of direct-current voltage duration time combination corresponding to the minimum deviation is searched through a particle swarm algorithm.
The actual measurement value is obtained by calculating through a strain measurement experiment of a suspended weight, and the specific measurement method is as follows: the fiber Bragg grating with the minimum characteristic wavelength is used as a reference grating, the fiber Bragg grating with the maximum characteristic wavelength is used as a sensing grating, the maximum wavelength drift difference is formed between the fiber Bragg grating with the minimum characteristic wavelength and the fiber Bragg grating with the maximum characteristic wavelength under the alternating current driving voltage, the fiber Bragg grating is vertically fixed in the experiment, the axial stress is applied to the fiber Bragg grating with the maximum characteristic wavelength through a hanging weight, and the wavelength drift generated by the fiber Bragg grating with the minimum characteristic wavelength and the maximum characteristic wavelength under the axial stress is measured by an Agilent 8164B tunable laser; the theoretical strain value refers to the theoretical strain caused by the weight of the weight and can be calculated by the following three formulas:
wherein, Delta epsilon is a strain value, Delta F is the normal stress of the optical fiber, Delta A is the stress area of the optical fiber, and E represents the Young modulus of No. 45 alloy steel; d represents the diameter of the optical fiber; Δ m represents the total weight of the weight applied to the fiber, g represents the gravitational acceleration rate, and g is 9.8 m/s.
4. And 3, comparing the grating wavelength change obtained by measurement under the optimal direct current voltage with the grating wavelength change obtained under the alternating current voltage to obtain the relative nonlinearity degree of the alternating current voltage. And (3) converting the center position of the grating wavelength under the alternating voltage obtained in the step (1) into the center position under the optimal direct voltage through polynomial fitting, and calculating to obtain an alternating current-direct current voltage correction curve for driving the tunable optical filter.
The voltage waveform formed by the multi-step direct current voltage is consistent with the period of the original alternating current driving voltage waveform, the maximum amplitude is consistent, and the time from zero to the maximum amplitude is consistent. The drive element of the tunable fabry-perot filter is piezoelectric ceramic, and the nonlinearity of the piezoelectric ceramic under direct-current voltage is smaller. During the process that the voltage rises from zero to the maximum voltage, the voltage-wavelength nonlinearity degree of the tunable Fabry-Perot filter is maximum at the beginning stage and then gradually reduced. And searching the duration of each segmented direct current voltage through a particle swarm algorithm, determining the form of the optimal direct current driving voltage, and converting the Bragg peak wavelength under the alternating current driving into the peak wavelength under the optimal direct current driving through polynomial fitting.
Claims (2)
1. A tunable Fabry-Perot filter driving voltage optimization method is characterized in that the rising part voltage of the traditional alternating current driving voltage is converted into a plurality of gradually increasing direct current voltage sections, the optimal segmented direct current voltage duration time is searched through a particle swarm optimization, and the optimized direct current voltage is obtained; converting the center position of a reflection peak obtained by scanning the traditional alternating voltage drive into the center position of the response of the adjustable filter under the optimized direct voltage to obtain the final alternating current/direct current drive voltage;
the method comprises the following specific steps of obtaining the optimized direct current voltage: and changing the duration time of each segmented direct-current voltage in the direct-current voltage, recording the deviation between the true value and the theoretical strain value under different conditions, and searching each corresponding segment of direct-current voltage duration time combination under the condition of minimum deviation through a particle swarm algorithm.
2. The method for optimizing the driving voltage of the tunable fabry-perot filter according to claim 1, wherein the relative non-linearity of the ac voltage is obtained by comparing the grating wavelength variation measured under the optimized dc voltage with the grating wavelength variation obtained under the conventional ac voltage; and converting the central position of the grating wavelength under the traditional alternating voltage into the central position under the optimized direct voltage through polynomial fitting, and calculating to obtain an alternating current-direct current voltage correction curve for driving the tunable optical filter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201637964U (en) * | 2009-12-31 | 2010-11-17 | 中国计量学院 | Tunable filter based on chirping phase-shift optical fiber grating |
| CN103928834A (en) * | 2014-04-25 | 2014-07-16 | 北京交通大学 | Ultra-narrow line-width FDML ring-shaped laser based on SOA |
| CN205665539U (en) * | 2016-05-16 | 2016-10-26 | 珠海艾文科技有限公司 | Electric drive device is pressed to self -adaptation |
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| CN101145847B (en) * | 2007-03-21 | 2010-12-29 | 中兴通讯股份有限公司 | Preferential choice method for wave length scheme of G.653 optical fiber WDM system |
| CN107065619B (en) * | 2017-05-15 | 2019-10-29 | 武汉光迅科技股份有限公司 | A kind of the wavelength control electrode parameter setting method and device of tunable laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201637964U (en) * | 2009-12-31 | 2010-11-17 | 中国计量学院 | Tunable filter based on chirping phase-shift optical fiber grating |
| CN103928834A (en) * | 2014-04-25 | 2014-07-16 | 北京交通大学 | Ultra-narrow line-width FDML ring-shaped laser based on SOA |
| CN205665539U (en) * | 2016-05-16 | 2016-10-26 | 珠海艾文科技有限公司 | Electric drive device is pressed to self -adaptation |
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