CN104792502B - A kind of method for measuring reflectivity of weak fiber bragg grating - Google Patents
A kind of method for measuring reflectivity of weak fiber bragg grating Download PDFInfo
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- CN104792502B CN104792502B CN201510213700.3A CN201510213700A CN104792502B CN 104792502 B CN104792502 B CN 104792502B CN 201510213700 A CN201510213700 A CN 201510213700A CN 104792502 B CN104792502 B CN 104792502B
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Abstract
The present invention relates to a kind of method for measuring reflectivity of weak fiber bragg grating, belong to spectral measurement methodses field.This method specifically includes following steps：Tested optical fiber grating is placed in antiradar reflectivity fiber grating reflectance test system；The UPC type fibre-optical splices end of tested optical fiber grating is cleaned totally again, and placed it into medium 1, obtains the reflectance spectrum of tested optical fiber grating；Then keep system to fix, will be placed in again after the cleaning totally of UPC types fibre-optical splice in medium 2 rapidly, obtain the reflectance spectrum of tested optical fiber grating again；Finally the reflectivity of weak optical fiber Bragg grating is tested using the peak computational of two reflectance spectrums.A kind of method for measuring reflectivity of weak fiber bragg grating provided by the invention, measurement reflectivity of weak fiber bragg grating is calculated by obtaining bireflectance spectrum, eliminate the influence of fiber end face and fibre-optical splice connection to measurement, and the problem of greatly reducing light source power shake, it disclosure satisfy that the requirement of accurate measurement reflectivity of weak fiber bragg grating.
Description
Technical field
The invention belongs to spectral measurement methodses field of measuring technique, is related to a kind of side for measuring reflectivity of weak fiber bragg grating
Method.
Background technology
Fiber grating is a kind of optical fibre device for being widely used in the fields such as fiber optic communication, optical fiber laser, Fibre Optical Sensor,
It has the function that can reflect specific wavelength.In application fiber grating, reflectivity is a sign fiber grating performance
Index, according to the size of reflectivity, fiber grating has point of power.The weak fiber light in fiber optic communication, optical fiber laser application
Grid often play an important role in terms of filtering and wavelength locking；It is applied in Fibre Optical Sensor, it is advantageous to avoid multiplexing from holding
The limitation of amount, realize the quasi-distributed sensing of high density.When being designed or being applied using weak optical fiber Bragg grating, it is able to know that
The size of its reflectivity is highly important, but it is a problem that its reflectivity, which is measured, exactly.
Measurement for fiber grating reflectivity, it can be counted by the transmission spectrum or reflectance spectrum for obtaining fiber grating
Calculate.
By fiber grating transmission spectrum come to measure its reflectivity be the method that generally uses.Obtaining fiber grating transmission spectrum
When, it can be obtained by the use of wideband light source or tunable laser as input light source using spectrometer or light power meter saturating
Penetrate spectrum.Finally utilize formula R=1-10-△T(dBm)/10Fiber grating reflectivity is calculated, wherein △ T (dBm) are paddy in transmission spectrum
Depth, as shown in Figure 1.But △ T (dBm) size reduces with the reduction of fiber grating reflectivity, when reflectivity is less than
When 20%, △ T (dBm) value will be less than 1dB.Input the uneven degree and power output shake, spectrometer and light work(of light source
The inaccuracy of rate meter power measurement all will greatly influence the determination of actual △ T (dBm), so as to cause reflectivity great
Measurement error.Therefore for weak optical fiber Bragg grating (R<20%), its reflectivity should not be measured by obtaining transmission spectrum.
The content of the invention
In view of this, it is an object of the invention to provide a kind of method for measuring reflectivity of weak fiber bragg grating, this method pole
The earth reduces the problem of light source power shake, and eliminates influence of the uneven degree of light source to test.
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of method for measuring reflectivity of weak fiber bragg grating, this method comprise the following steps：
S1：Tested optical fiber grating is placed in antiradar reflectivity fiber grating reflectance test system；
S2：The UPC type fibre-optical splices end cleaning of tested optical fiber grating is clean, and place it into medium 1, it is tested
The reflectance spectrum of fiber grating；The refractive index of the medium 1 is known parameters；
S3：Holding system is fixed, and will be placed in again after the cleaning totally of UPC types fibre-optical splice in medium 2 rapidly, is obtained quilt again
Survey the reflectance spectrum of fiber grating；The refractive index of the medium 2 is known parameters；
S4：The reflectivity of weak optical fiber Bragg grating is tested using the peak computational of two reflectance spectrums.
Further, the reflectivity of tested weak optical fiber Bragg grating is calculated in S4 by below equation,
Wherein, Rs1The interface reflectivity being placed in for the fiber end face of UPC type fibre-optical splices in medium 1, Rs2For UPC type light
The interface reflectivity that the fiber end face of fine joint is placed in medium 2；RFFor tested optical fiber optical grating reflection rate；△ P (dBm) are two
The peak difference of reflectance spectrum；The boundary that reflectivity, the UPC type fibre-optical splices of the tested optical fiber grating are placed in medium 1 and medium 2
Face reflectivity is all higher than 10-4。
Further, the Rs1And Rs2Calculated by below equation,
Wherein, n1For fiber core refractive index, n2For the refractive index of medium 1 or medium 2.
Further, the antiradar reflectivity fiber grating reflectance test system in the S1 includes APC types fibre-optical splice, UPC
Type fibre-optical splice, 1X2 shunts, wideband light source and spectrometer and tested optical fiber grating；
One end welding APC type fibre-optical splices of the tested optical fiber grating, other end welding UPC type fibre-optical splices；It is described
One end of APC types fibre-optical splice and 1X2 shunts；The other both ends of the 1X2 shunts respectively with wideband light source and spectrometer
It is connected.
The beneficial effects of the present invention are：A kind of method for measuring reflectivity of weak fiber bragg grating provided by the invention, passes through
Bireflectance spectrum is obtained to calculate measurement reflectivity of weak fiber bragg grating, when measuring reflectance spectrum twice, using high return loss
Fibre-optical splice, and two reflecting interfaces of reasonable selection, eliminate the influence of fiber end face and fibre-optical splice connection to measurement；In addition
When measuring, light path connection keeps fixing, and the interval time of spectral measurement is short twice, can greatly reduce and eliminate light source work(
The problem of rate is shaken；It was found from the principle that double spectroscopic methodologies calculate, what it was utilized is the power ratio at Same Wavelength, without determining
The valley depth or peak height of the foregoing description, so as to eliminate influence of the uneven degree of light source to test from principle.Should
Method disclosure satisfy that the requirement of accurate measurement reflectivity of weak fiber bragg grating.
Brief description of the drawings
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
The detailed description of one step, wherein：
Fig. 1 is transmission spectrometry fiber grating reflectivity principle；
Fig. 2 is the flow chart of the method for the invention；
Fig. 3 is antiradar reflectivity fiber grating reflectance test system；
Fig. 4, which is that bireflectance spectrum is accurate, calculates reflectivity of weak fiber bragg grating schematic diagram；
Fig. 5 is double spectroscopic methodology antiradar reflectivity fiber grating measured results.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
It is provided by the invention it is a kind of measure reflectivity of weak fiber bragg grating method, this method by obtain bireflectance spectrum come
Measurement reflectivity of weak fiber bragg grating is calculated, the uneven degree for eliminating input light source and power output shake, optical fiber end can be reduced
The influence to reflectivity of weak fiber bragg grating measurement such as face and fibre-optical splice connection.This method flow chart is as shown in Fig. 2 specifically include
Following steps；
S1：Tested optical fiber grating is placed in antiradar reflectivity fiber grating reflectance test system；
Antiradar reflectivity fiber grating reflectance test system is as shown in figure 3, the system includes APC types fibre-optical splice, UPC types
Fibre-optical splice, 1X2 shunts, wideband light source and spectrometer and tested optical fiber grating；
The oblique spherical of tested optical fiber grating one end welding (APC) fibre-optical splice, other end welding ultra physical face type
(UPC) fibre-optical splice, APC ends are connected with one end (APC types fibre-optical splice) of 1X2 shunts, then by 1X2 shunts in addition
Both ends are connected with wideband light source with spectrometer respectively；
S2：The UPC type fibre-optical splices end cleaning of tested optical fiber grating is clean, and place it into medium 1, it is tested
The reflectance spectrum of fiber grating；The refractive index of the medium 1 is known parameters；Medium 1 can be known to air or refractive index
Liquid.
S3：Holding system is fixed, and will be placed in again after the cleaning totally of UPC types fibre-optical splice in medium 2 rapidly, is obtained quilt again
Survey the reflectance spectrum of fiber grating；The refractive index of the medium 2 is known parameters；Medium 2 can be liquid known to a kind of refractive index
Body.
S4：The reflectivity of weak optical fiber Bragg grating is tested using the peak computational of two reflectance spectrums.
When choosing the reflecting medium in S2 and S3, the reflectivity difference for the selection two media that should try one's best is larger, to ensure
Two reflectance spectrums have obvious peak difference, are easy to calculate.
The principle for calculating reflectivity of weak fiber bragg grating is composed using bireflectance：
If two reflectance spectrums obtained with above method of testing are as shown in figure 4, because the echo of APC type fibre-optical splices damages
Consumption is 10 equivalent to its end face reflection rate up to 60dB-6As long as work as fiber grating reflectivity and UPC ends reflectivity up to 10-4With
On, the reflections affect of optical fiber junction can be ignored substantially.Therefore, light is only in weak optical fiber Bragg grating and UPC type fibre-optical splices interface
Between multiple reflections be present, its equivalent reflectivity ReffIt is represented by
Wherein RFFor fiber grating reflectivity, RsFor UPC ends interface reflectivity.
The reflectivity of tested optical fiber grating is calculated, finds the peak power of two reflectance spectrum central wavelengths respectively, its
The ratio between peak power is the ratio between equivalent reflectivity being equal under two kinds of reflecting interfaces, is therefore deduced that
Wherein, Rs1The interface reflectivity being placed in for the fiber end face of UPC type fibre-optical splices in medium 1, Rs2For UPC type light
The interface reflectivity that the fiber end face of fine joint is placed in medium 2；RFFor tested optical fiber optical grating reflection rate；△ P (dBm) are two
The peak difference of reflectance spectrum；The boundary that reflectivity, the UPC type fibre-optical splices of the tested optical fiber grating are placed in medium 1 and medium 2
Face reflectivity is all higher than 10-4。
Following quadratic equation with one unknown can be drawn by (2) formula
, can be to calculate the reflectivity of tested optical fiber grating by solving this equation.
Because the fiber end face of UPC type fibre-optical splices is plane, its interface reflectivity being placed in medium can be according to (4)
Formula calculates
In formula, n1For fiber core refractive index, n2For the refractive index of medium 1 or medium 2.
To meet Rs>10-4, liquid typically can be using deionized water or alcohol etc..
It was found from analysis more than, as long as calculating Rs1And Rs2, and according to the peak power ratio measured twice, so that it may
In the hope of going out optical fiber optical grating reflection rate RF。
Using following test condition, the test result such as Fig. 5 can be obtained.
Test condition：Wideband light source (the desk-top ASE light sources of the vast space in Shanghai), spectrometer (Ando-AQ6317B), 1X2 optical fiber point
Road device, tested optical fiber grating (optical fiber be SMF-28e single-mode fibers, reflectivity 3.39%), two kinds of reflecting mediums (air, go from
Sub- water).
Due to when measuring reflectance spectrum twice, reflecting boundaries using the fibre-optical splice of high return loss, and reasonable selection two
Face, eliminate the influence of fiber end face and fibre-optical splice connection to measurement；In addition when measuring, light path connection keeps fixing,
The interval time of spectral measurement is short twice, can greatly reduce the problem of eliminating light source power shake；Calculated from double spectroscopic methodologies
Principle understands that what it was utilized is the power ratio at Same Wavelength, without determining the valley depth or peak height of the foregoing description,
So as to eliminate influence of the uneven degree of light source to test from principle.Therefore, the method for the invention disclosure satisfy that accurately
Measure the requirement of reflectivity of weak fiber bragg grating.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (2)
- A kind of 1. method for measuring reflectivity of weak fiber bragg grating, it is characterised in that：This method comprises the following steps：S1：Tested optical fiber grating is placed in antiradar reflectivity fiber grating reflectance test system；S2：The UPC type fibre-optical splices end cleaning of tested optical fiber grating is clean, and place it into medium 1, obtain tested optical fiber The reflectance spectrum of grating；The refractive index of the medium 1 is known parameters；S3：Holding system is fixed, and will be placed in medium 2 rapidly, is obtained again by light-metering after the cleaning totally of UPC types fibre-optical splice again The reflectance spectrum of fine grating；The refractive index of the medium 2 is known parameters；S4：The reflectivity of weak optical fiber Bragg grating is tested using the peak computational of two reflectance spectrums；Calculated in S4 by below equation The reflectivity of tested weak optical fiber Bragg grating,Wherein, Rs1The interface reflectivity being placed in for the fiber end face of UPC type fibre-optical splices in medium 1, Rs2For UPC type fibre-optical splices The interface reflectivity that is placed in medium 2 of fiber end face；RFFor tested optical fiber optical grating reflection rate；Δ P (dBm) is two reflected lights The peak difference of spectrum；Reflectivity, the UPC type fibre-optical splices of the tested optical fiber grating are placed in the reflection of the interface in medium 1 and medium 2 Rate is all higher than 10-4；Antiradar reflectivity fiber grating reflectance test system in the S1 includes APC types fibre-optical splice, UPC type light Fine joint, 1X2 shunts, wideband light source and spectrometer and tested optical fiber grating；One end welding APC type fibre-optical splices of the tested optical fiber grating, other end welding UPC type fibre-optical splices；The APC types One end of fibre-optical splice and 1X2 shunts；The other both ends of the 1X2 shunts are connected with wideband light source with spectrometer respectively.
- A kind of 2. method for measuring reflectivity of weak fiber bragg grating according to claim 1, it is characterised in that：The Rs1And Rs2 Calculated by below equation,Wherein, n1For fiber core refractive index, n2For the refractive index of medium 1 or medium 2.
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| CN107764514A (en) * | 2016-08-22 | 2018-03-06 | 南京理工大学 | A kind of low reflective grid reflectivity device for accurately measuring of high-capacity optical fiber laser |
| CN107588927B (en) * | 2017-07-20 | 2020-04-24 | 湖北工业大学 | Method for measuring reflectivity of weak fiber grating based on frequency shift interference technology |
| CN117268708B (en) * | 2023-11-21 | 2024-02-09 | 苏州英谷激光有限公司 | Parameter testing method and device for reflection spectrum flat-top type polarization-preserving chirped fiber grating |
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| JP2000258190A (en) * | 1999-03-09 | 2000-09-22 | Mitsubishi Cable Ind Ltd | Sensor employing fiber grating and physical quantity measuring method |
| CN101479577A (en) * | 2006-05-23 | 2009-07-08 | Itf实验室 | Method for monitoring and measuring optical properties of device in polarization maintaining fibers by using reference fiber Bragg grating and fiber components manufactured thereby |
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| US6914681B2 (en) * | 2001-08-22 | 2005-07-05 | Agilent Technologies, Inc. | Interferometric optical component analyzer based on orthogonal filters |
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| JP2000258190A (en) * | 1999-03-09 | 2000-09-22 | Mitsubishi Cable Ind Ltd | Sensor employing fiber grating and physical quantity measuring method |
| CN101479577A (en) * | 2006-05-23 | 2009-07-08 | Itf实验室 | Method for monitoring and measuring optical properties of device in polarization maintaining fibers by using reference fiber Bragg grating and fiber components manufactured thereby |
| CN102323042A (en) * | 2011-09-08 | 2012-01-18 | 中国科学院半导体研究所 | Method for accurately measuring reflectivity of weak fiber bragg grating |
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