CN104536081A - Apparatus and method for manufacturing high-precision multi-wavelength weak-reflectivity fiber bragg grating array - Google Patents
Apparatus and method for manufacturing high-precision multi-wavelength weak-reflectivity fiber bragg grating array Download PDFInfo
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- CN104536081A CN104536081A CN201410725878.1A CN201410725878A CN104536081A CN 104536081 A CN104536081 A CN 104536081A CN 201410725878 A CN201410725878 A CN 201410725878A CN 104536081 A CN104536081 A CN 104536081A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
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Abstract
The invention relates to an apparatus and method for manufacturing a high-precision multi-wavelength weak-reflectivity fiber bragg grating array. The apparatus is characterized in that a broad-spectrum light source is connected with a port 1 of a circulator; a port 2 of the circulator is successively connected with a sensitized optical fiber and a spectrum analyzer; and a port 3 of the circulator is successively connected with an adjustable narrow-band filter and an optical power monitoring system. According to the manufacturing method, a resolution ration, a central wavelength, and a wavelength span of the spectrum analyzer are set; when a fiber bragg grating is etched and manufactured at the sensitized optical fiber, the offset of the central wavelength of the fiber bragg grating is controlled to be less than 0.1 nm, thereby obtaining a transmission spectrum of a weak-reflectivity fiber bragg grating; a central wavelength and a wavelength span of the adjustable narrow-band filter are set and a reflection power and position information of a reflection point of the weak-reflectivity fiber bragg grating are obtained; when the reflection power of the fiber bragg grating meets the design requirement, one qualified fiber bragg grating is finished; and then the steps are repeated until all fiber bragg gratings are finished, thereby completing a multi-wavelength weak-reflectivity fiber bragg grating array.
Description
Technical field
The present invention relates to the manufacture field of optical device, particularly accurately make multi-wavelength weak reflectivity optical fiber optical grating array device and method, the method that the method adopts reflectivity and transmitted spectrum to combine, by the monitoring center wavelength shift of transmission spectrum and the size variation of reflectivity, can realize accurately manufacturing the weak reflectivity fiber grating of multi-wavelength.
Background technology
In fields such as Fibre Optical Sensors, fiber grating is widely used as conventional optical passive component.According to different demands, there is dissimilar fiber grating, as bragg grating; Interfere type Fibre Optical Sensor based on fiber grating needs the fiber grating etc. with antiradar reflectivity.For bragg grating, it is all important key index that fiber grating reflectivity, three dB bandwidth, limit touch rejection ratio; And the reflectivity of fiber grating, for most important optical design.
When making ordinary optic fibre grating, utilize spectrometer to observe wideband light source by the transmission spectrum after grating, calculate the reflectivity of grating.This method is only applicable to the grating of middle and high reflectivity.Document " Reflectivity measurement of weak fiber Bragg grating " (Wuhan University of Technology's journal, J.Wuhan Univ.Mater) propose a kind of method of many gratings cumulative measurement, by measuring the integrated reflection of this group grating, calculate the average reflectance of single grating.This method error is large and can not identify the real reflectance of single grating.
Summary of the invention
Object of the present invention, in order to overcome above-mentioned prior art Problems existing and deficiency, is provided one accurately can make multi-wavelength weak reflectivity optical fiber optical grating array device and method, is jointly determined by the transmission spectrum of fiber grating and the size of reflective power.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of making High-precision multi-wavelength weak reflectivity optical fiber optical grating array device, be made up of the optical fiber of wide spectrum light source, circulator, sensitization, spectroanalysis instrument, adjustable narrow band filter, optical power monitoring system, it is characterized in that: wide spectrum light source is connected with the port one of circulator, the port 2 of circulator is connected with optical fiber one end of sensitization, and the other end of the optical fiber of sensitization is connected with spectroanalysis instrument; The port 3 of circulator is connected with the input end of adjustable narrow band filter; The output terminal of adjustable narrow band filter is connected to optical power monitoring system.
Above-mentioned making High-precision multi-wavelength weak reflectivity optical fiber optical grating array device is utilized to make the method for the weak reflectivity optical fiber optical grating array of High-precision multi-wavelength, it is characterized in that carrying out according to the following steps: step one, the resolution of spectroanalysis instrument, centre wavelength and span lengths are set, on the optical fiber of sensitization during inscribing fiber grating, and the deviation of the centre wavelength of fiber grating is controlled within 0.1nm, obtain the transmission spectrum of weak reflectivity fiber grating; Step 2, arranges centre wavelength and the span lengths of adjustable narrow band filter, obtains the weak reflective power of reflectivity fiber grating and the positional information of reflection spot in optical power monitoring system; A fiber grating at once when the reflective power of fiber grating reaches designing requirement; Step 3, repeats step one and step 2, until carved all fiber gratings to complete the weak reflectivity optical fiber optical grating array of multi-wavelength.
The weak reflectivity of described multi-wavelength weak reflectivity optical fiber optical grating array controls within the design error of 5%.
When the present invention makes High-precision multi-wavelength weak reflectivity optical fiber optical grating array, the centre wavelength of spectroanalysis instrument is set, when online inscribing fiber grating, guarantees that centre wavelength deviation controls within 0.1nm; Observed the reflectivity of fiber grating by optical power monitoring system, reflectivity is controlled within the design error of 5%.
Accompanying drawing explanation
Fig. 1 is device schematic diagram of the present invention;
Fig. 2 is the schematic diagram of the weak reflectivity optical fiber optical grating array of multi-wavelength of the present invention;
Embodiment
For further illustrating concrete technology contents of the present invention, below in conjunction with example and accompanying drawing, the present invention is explained in detail, wherein:
Please refer to Fig. 1, apparatus of the present invention are made up of the optical fiber of wide spectrum light source, circulator, sensitization, spectroanalysis instrument, adjustable narrow band filter, optical power monitoring system, it is characterized in that: wide spectrum light source is connected with the port one of circulator, the port 2 of circulator is connected with optical fiber one end of sensitization, and the other end of the optical fiber of sensitization is connected with spectroanalysis instrument; The port 3 of circulator is connected with the input end of adjustable narrow band filter; The output terminal of adjustable narrow band filter is connected to optical power monitoring system.
Above-mentioned making High-precision multi-wavelength weak reflectivity optical fiber optical grating array device is utilized to make the method for the weak reflectivity optical fiber optical grating array of High-precision multi-wavelength, it is characterized in that carrying out according to the following steps: step one, the resolution of spectroanalysis instrument, centre wavelength and span lengths are set, on the optical fiber of sensitization during inscribing fiber grating, and the deviation of the centre wavelength of fiber grating is controlled within 0.1nm, obtain the transmission spectrum of weak reflectivity fiber grating; Step 2, arranges centre wavelength and the span lengths of adjustable narrow band filter, obtains the weak reflective power of reflectivity fiber grating and the positional information of reflection spot in optical power monitoring system; A fiber grating at once when the reflective power of fiber grating reaches designing requirement; Step 3, repeats step one and step 2, until carved all fiber gratings to complete the weak reflectivity optical fiber optical grating array of multi-wavelength.The weak reflectivity of described multi-wavelength weak reflectivity optical fiber optical grating array controls within the design error of 5%.
Please refer to Fig. 2, Fig. 2 is according to the embodiment of the present invention, the detail view of the weak reflectivity fiber grating of the multi-wavelength drawn, embodiment specifically comprises the following steps:
Step 1: wide spectrum light source (desk-top ASE light source) is connected with the port one of general commercial circulator;
Step 2: optical fiber one end of the sensitization of weak to the port 2 of general commercial circulator and the multi-wavelength that will make reflectivity fiber grating is connected; The optical fiber other end of sensitization is connected with spectroanalysis instrument, the resolution of spectroanalysis instrument, centre wavelength and span lengths are set, on the optical fiber of sensitization during inscribing fiber grating, and the deviation of the centre wavelength of fiber grating is controlled within 0.1nm, obtain the transmission spectrum of weak reflectivity fiber grating;
Step 3: the port 3 of general commercial circulator is connected with adjustable narrow band filter;
Step 4: the centre wavelength of adjustment adjustable narrow band filter and bandwidth, observes the reflective power of specific wavelength grating by optical power monitoring system.Because the reflectivity of each grating is through strict calculating, all between 1% ~ 2%; Supervise monitoring system by luminous power, when the reflectivity observing grating reaches within 5% of design load deviation, stop scribing; Then, carry out scribing of next specific wavelength grating, until all gratings have all been scribed.The sharpest edges of the method are, accurately can scribe each fiber grating.
In this step, the setting of spectroanalysis instrument resolution is very important for accurately producing multi-wavelength weak reflectivity fiber grating, and the resolution of spectroanalysis instrument is less than the three dB bandwidth of fiber grating.
In order to the advantage of multi-wavelength provided by the invention weak reflectivity fiber grating reflectivity method for making is described, contrast adopts traditional wide spectrum light source and spectroanalysis instrument to combine, and makes the method for weak reflectivity fiber grating; According to formula
calculate the reflectivity of weak optical fiber Bragg grating, wherein T
dBfor the degree of depth of transmission spectrum two-story valley.Due to T
dBbe worth less, cannot accurately read, and then accurately cannot obtain the reflectivity of weak optical fiber Bragg grating, can only T be provided
dBthe large probable value of reflectivity corresponding during ≈ 0.1dB is 2.28%.By contrast, will find that multi-wavelength provided by the invention weak reflectivity fiber grating method for making will be far superior to classic method in degree of accuracy.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. one kind makes High-precision multi-wavelength weak reflectivity optical fiber optical grating array device, be made up of the optical fiber of wide spectrum light source, circulator, sensitization, spectroanalysis instrument, adjustable narrow band filter, optical power monitoring system, it is characterized in that: wide spectrum light source is connected with the port one of circulator, the port 2 of circulator is connected with optical fiber one end of sensitization, and the other end of the optical fiber of sensitization is connected with spectroanalysis instrument; The port 3 of circulator is connected with the input end of adjustable narrow band filter; The output terminal of adjustable narrow band filter is connected to optical power monitoring system.
2. utilize the making High-precision multi-wavelength weak reflectivity optical fiber optical grating array device described in claim 1 to make the method for the weak reflectivity optical fiber optical grating array of High-precision multi-wavelength, it is characterized in that carrying out according to the following steps: step one, the resolution of spectroanalysis instrument, centre wavelength and span lengths are set, on the optical fiber of sensitization during inscribing fiber grating, and the deviation of the centre wavelength of fiber grating is controlled within 0.1nm, obtain the transmission spectrum of weak reflectivity fiber grating; Step 2, arranges centre wavelength and the span lengths of adjustable narrow band filter, obtains the weak reflective power of reflectivity fiber grating and the positional information of reflection spot in optical power monitoring system; A fiber grating at once when the reflective power of fiber grating reaches designing requirement; Step 3, repeats step one and step 2, until carved all fiber gratings to complete the weak reflectivity optical fiber optical grating array of multi-wavelength.
3. the method for the weak reflectivity optical fiber optical grating array of making High-precision multi-wavelength according to claim 2, is characterized in that: the weak reflectivity of described multi-wavelength weak reflectivity optical fiber optical grating array controls within the design error of 5%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2022506029A (en) * | 2018-11-08 | 2022-01-17 | コーニンクレッカ フィリップス エヌ ヴェ | How to Optically Interrogate Fiber Optic Sensors, Optical Systems and Fiber Optic Sensors |
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| WO2007004339A1 (en) * | 2005-07-01 | 2007-01-11 | University Of Yamanashi | Method and device for identifying bragg grating structure and manufacturing method thereof |
| CN102621609A (en) * | 2012-04-11 | 2012-08-01 | 中国科学院上海光学精密机械研究所 | Etching device and etching method for any apodised fiber bragg grating |
| CN103033205A (en) * | 2012-12-14 | 2013-04-10 | 张丽 | Fiber bragg grating interrogator based on digitization tunable light sources and method thereof |
| CN103777270A (en) * | 2014-02-11 | 2014-05-07 | 武汉理工大学 | Device and method for automatic, static continuous preparation of fiber bragg grating array |
| CN204422808U (en) * | 2014-12-03 | 2015-06-24 | 北京神州普惠科技股份有限公司 | A kind of making High-precision multi-wavelength weak reflectivity optical fiber optical grating array device |
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| WO2007004339A1 (en) * | 2005-07-01 | 2007-01-11 | University Of Yamanashi | Method and device for identifying bragg grating structure and manufacturing method thereof |
| CN102621609A (en) * | 2012-04-11 | 2012-08-01 | 中国科学院上海光学精密机械研究所 | Etching device and etching method for any apodised fiber bragg grating |
| CN103033205A (en) * | 2012-12-14 | 2013-04-10 | 张丽 | Fiber bragg grating interrogator based on digitization tunable light sources and method thereof |
| CN103777270A (en) * | 2014-02-11 | 2014-05-07 | 武汉理工大学 | Device and method for automatic, static continuous preparation of fiber bragg grating array |
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Cited By (2)
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| JP2022506029A (en) * | 2018-11-08 | 2022-01-17 | コーニンクレッカ フィリップス エヌ ヴェ | How to Optically Interrogate Fiber Optic Sensors, Optical Systems and Fiber Optic Sensors |
| JP7428707B2 (en) | 2018-11-08 | 2024-02-06 | コーニンクレッカ フィリップス エヌ ヴェ | Fiber optic sensors, optical systems and methods for optically interrogating fiber optic sensors |
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