CN103558011A - Experimental device for measuring numerical apertures and attenuation coefficients of light-guide fibers - Google Patents
Experimental device for measuring numerical apertures and attenuation coefficients of light-guide fibers Download PDFInfo
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- CN103558011A CN103558011A CN201310503849.6A CN201310503849A CN103558011A CN 103558011 A CN103558011 A CN 103558011A CN 201310503849 A CN201310503849 A CN 201310503849A CN 103558011 A CN103558011 A CN 103558011A
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Abstract
The invention provides an experimental device for measuring the numerical apertures and the attenuation coefficients of light-guide fibers. The experimental device comprises a light source, a focusing device (2), a plurality of light intensity sensors, a collimator (5), a shading box (8), a semi-reflexivity semi-transparent lens (9), a processor (11), an angle sensor (12), a first actuating device (16) and a second actuating device (17). The experimental device measures a first optical fiber (6) to be measured and a second optical fiber (14) to be measured which are the same in structure and different in length. The experimental device has two working modes, namely the numerical aperture mode and the attenuation coefficient mode, is capable of being conveniently switched between the two modes, and then measures the numerical apertures and the attenuation coefficients of the optical fibers to be measured.
Description
Technical field
The present invention relates to parametric measurement field, be specifically related to a kind of experimental facilities for fibre-optic parametric measurement.
Background technology
Along with the develop rapidly of optical communication technique, light transmitting fiber is that the application of optical fiber is very universal.Numerical aperture characterizes the light collecting light ability of optical fiber, the loss of attenuation coefficient reaction optical fiber.The Accurate Determining of these two parameters plays very important effect to the transmission range of the evaluation of optical fiber quality and optical fiber telecommunications system definite.In Experiment of College Physics, due to the measuring method of numerical aperture and attenuation coefficient and the difference of instrument, conventionally use respectively two cover apparatus measures.Measurement mechanism is various, and step is complicated, and the test duration is long, and instrument and equipment is efficient utilization not.
Summary of the invention
The object of the invention is to: a kind of experimental facilities is provided, and it can complete the numerical aperture of optical fiber and the measurement of attenuation coefficient simultaneously, thereby simplify test process, improve plant factor, save time.
the measurement of numerical aperture
Numerical aperture (NA) has two kinds of definition modes: the one, and maximum theoretical numerical aperture, the 2nd, far field intensity effective numerical aperture NA
eff.NA
effbe defined as the sine value that light intensity on optical fiber far-field radiation pattern drops to the half angle at maximal value 5% place.That conventionally measure is far field intensity effective numerical aperture NA
eff, thereby the present invention is also intended to this effective numerical aperture to measure, can by measure light by optical fiber after the variation of light intensity effectively measure numerical aperture.
the measurement of attenuation coefficient β
In order to measure attenuation coefficient β, be generally that the laser beam that same angle is distributed is L by length respectively
1and L
2the identical optical fiber of two root timber material, measure respectively the transmitted light intensity I after two optical fiber
1and I
2thereby, obtain:
I
1=I
0(1-R)
2(1-A)
ne
-βL1 （1）
I
2=I
0(1-R)
2(1-A)
n’e
-βL2 （2）
Wherein, incident intensity is I
0, for two optical fiber, adopt identical incident intensity, the light intensity reflectivity that R is end face, the loss percentage that A is total reflection, n, n ' are respectively the total reflection number of times of light in two optical fiber, if L
1and L
2be more or less the same, n ≈ n '.Can select different length for example 80mm and 60mm, 40mm and 30mm, both length can not differ by more than 20mm.When differing over 20mm, because the loss percentage A inconvenience of total reflection is measured, will introduce larger error.
Formula (1)/(2), obtain I1/I2=e-β (L1-L2)=e-β △ L, and △ L=L1-L2 is the length difference of two optical fiber, and natural logarithm is got on both sides, obtains the attenuation coefficient β=(lnI of optical fiber
2-lnI
1)/△ L.
In the measurement of numerical aperture, need constantly to adjust incident beam and obtain optical fiber far-field radiation pattern in the incident angle of fiber end face.In general prior art, adopt and rotate optical fiber or adopt the mode of rotating light source to adjust incident beam in the incident angle of fiber end face.It generally requires incident beam to be generally defined as parallel beam, and to guarantee in rotation process, the incident angle of all light of incident beam is identical and the light quantity that incides fiber end face remains unchanged.Otherwise, in rotation process, cannot guarantee incident light quantity and angle, this can cause the benchmark of light intensity curve figure inconsistent.Whole measuring process needs an optical fiber, carries out one-shot measurement and can obtain a result.
In the prior art, while measuring attenuation coefficient, do not need to change the incident angle of light in incident beam, do not need to rotate optical fiber or light source, but need respectively two optical fiber successively to be measured.Therefore, incident ray need to be converged to together, be irradiated on the end face of optical fiber, identical to guarantee each transmitted light intensity.Whole measuring process needs two optical fiber, carries out twice measurement, can be calculated result.
In order to adopt two kinds of parameters of same set of device measuring numerical aperture and attenuation coefficient, need find both communicating a little.Present inventor's discovery, numerical aperture is last all relevant by the light intensity magnitude after optical fiber to light with attenuation coefficient.Based on this, present inventor has designed experimental facilities of the present invention.
Particularly, the present invention proposes a kind of experimental facilities of measuring fibre-optic numerical aperture and attenuation coefficient, described experimental facilities comprises: light source, focalizer, a plurality of light intensity sensor, collimator, shading box, half-reflecting half mirror, processor, angular transducer, the first actuating device, the second actuating device, wherein, described experimental facilities is measured the first testing fiber of same configuration, different length and the second testing fiber
Described light source is for Emission Lasers bundle;
Described focalizer is assembled described laser beam, and near the focus of described focalizer, the first light intensity sensor is set;
The first end face of described the first testing fiber receives described laser beam and exports described laser beam in the second end of described the first testing fiber, in the second end of described the first testing fiber, the second light intensity sensor is set;
Described shading box is arranged on the second end of described the first testing fiber, and receives the laser beam from described the first testing fiber at the light inlet place of described shading box;
Described half-reflecting half mirror is placed in described shading box, make the part of the laser beam that receives from the light inlet of described shading box be reflected and leave described shading box towards the first surface feeding sputtering of described the second testing fiber from the first light-emitting window of described shading box, another part transmission of the light beam receiving from the light inlet of described shading box is also left described shading box from the second light-emitting window of described shading box;
At the second light exit place of described shading box and the second end of described the second testing fiber, the 3rd light intensity sensor and the 4th light intensity sensor are set respectively;
Described the first actuating device is connected with described collimator, can drive described collimator to enter or leave in the light path between described focalizer and described the first testing fiber;
Described the second actuating device is connected with described the first testing fiber, for driving the optical axis rotation of the laser that described the first testing fiber sends with respect to described light source;
Described angular transducer is measured the optical axis of the laser that described the first testing fiber sends with respect to described light source and the angle of rotating;
Described processor receives each light intensity sensor and the measured signal of described angular transducer, and received signal is processed.
Preferably, the reflection of described half-reflecting half mirror and transmittivity are 50%:50%.
Preferably, described experimental facilities can be operated under two kinds of patterns: numerical aperture pattern and attenuation coefficient pattern.
Preferably, under numerical aperture pattern, described the first actuating device drives described collimator to enter in the light path between described focalizer and described the first testing fiber, and the laser beam that described focalizer sends described light source focuses on the first end of described collimator, described laser beam from the second end face outgoing of described collimator, and incides the first end face of described the first testing fiber after described collimator collimation.Described the 3rd light intensity sensor measure by the largest light intensity of the light beam of described half-reflecting half mirror institute transmission and along with the light intensity of the light beam of the rotation institute transmission of described the first testing fiber drop to largest light intensity 5% time, the angle that described the first testing fiber rotates, described processor is determined the numerical aperture of described the first testing fiber based on described angle.
Preferably, under attenuation coefficient pattern, described the first actuating device drives described collimator to leave the light path between described focalizer and described the first testing fiber, and described focalizer laser beam that described light source is sent focuses on the first end of described the first testing fiber.The two length difference of the incident intensity of first end of described processor based on described the first testing fiber, the output intensity of the second end, the output intensity of the second end of described the second testing fiber, described the first testing fiber and described the second testing fiber is determined the attenuation coefficient of described the first testing fiber and described the second testing fiber.
The present invention combines by LASER Light Source, lens, collimator the optional two kinds of incident beam patterns that form, and solves the different problem of incident beam of numerical aperture and attenuation coefficient; By adopting half-reflecting half mirror, solve the problem that needs two optical fiber in attenuation coefficient, simplify test process, two kinds of parameter measuring apparatus are more easily merged.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of experimental facilities according to an embodiment of the invention under pattern one state;
Fig. 2 is the schematic diagram of experimental facilities according to an embodiment of the invention under pattern two-state;
Fig. 3 is the partial enlarged view of two testing fibers shown in Fig. 2 while measuring attenuation coefficient.
Embodiment
Fig. 1 and Fig. 2 show respectively the work schematic diagram of one embodiment of the present of invention under numerical aperture pattern and attenuation coefficient pattern.
As shown in Figure 1, the experimental facilities of the present embodiment comprises: light source (only showing the light beam 1 that light source sends in Fig. 1), focalizer 2, a plurality of light intensity sensor 4,7,10 and 14, collimator 5, shading box 8, half-reflecting half mirror 9, processor 11, angular transducer 12, the first actuating device 17, the second actuating device 16.In Fig. 1, also show diaphragm 3, wire 15.It should be appreciated by those skilled in the art that diaphragm 3 is omissible in the situation that the focusing effect of focalizer 2 is enough good.
Because the experimental facilities in the present invention will be taken into account the two mensuration of fiber numerical aperture and attenuation coefficient, therefore, during measurement, adopt two testing fibers (the first testing fiber 6 and the second testing fiber 14), the structure of two testing fibers is identical, that is, belong to optical fiber of the same race, just there is some difference for the length of the two.
Light source preferably adopts laser instrument, for Emission Lasers bundle.
Focalizer 2 is convex lens, is preferably variable focus convex lens or the movable lens for moving along laser beam axis.Focalizer 2, for described laser beam is assembled/focused on, arranges a light intensity sensor near the focus of described focalizer 2.Here said " near " refer in the focusing range of laser beam but can not affect the position of experiment measuring effect.The impact on light intensity of the light intensity sensor adopting in the present invention is enough little, to such an extent as in the computation process of attenuation coefficient and numerical aperture, can think that the impact of light intensity sensor is negligible.Preferably, the present invention adopts transmission-type light intensity sensor.
Preferably, after line focus device focuses on, the focal spot of laser beam equals the internal diameter of fiber end face, thereby makes the measured value based on light intensity sensor, can easily obtain entering the light quantity of optical fiber.
The first end face of the first testing fiber 6 receives the laser beam from focalizer or collimator, in the second end of described the first testing fiber 6, the second light intensity sensor 7 is set, and the laser intensity at this place is measured.
Shading box 8 is arranged on the second end of the first testing fiber 6, and the light inlet of shading box 8 aims at the second end face of the first testing fiber 6, for receiving the laser beam from the first testing fiber 6.
Half-reflecting half mirror 9 is placed in shading box 8, and the light beam that the light inlet from shading box 8 is received carries out part reflection, part transmission.Particularly, the part that enters the light beam of shading box 8 is reflected and leaves described shading box from the first light-emitting window of shading box 8, and then towards the first surface feeding sputtering of the second testing fiber 14; Another part transmission of the light beam receiving from the light inlet of shading box 8 is left shading box 8 by half-reflecting half mirror 9 and from the second light-emitting window of shading box 8.
In the second end of the second testing fiber 14 and the second light exit place of shading box 8, a light intensity sensor being respectively set, in the present embodiment, is the 3rd light intensity sensor 10 and the 4th light intensity sensor 13.The first actuating device 17 is connected with collimator 5 by support bar, can drive collimator 5 to enter or leave in the light path between focalizer 2 and the first testing fiber 6.
The second actuating device 16 is connected with described the first testing fiber by support bar, for driving the optical axis rotation of the laser that described the first testing fiber 6 sends with respect to light source.Here saidly with respect to laser beam axis rotation, refer to the rotation along with the first testing fiber, the central shaft of the first testing fiber and the variable angle of this optical axis.Angular transducer 12 is attached to described the second actuating device 16 or the support bar being connected with this actuating device or the first testing fiber, for measuring the angle of the optical axis rotation of the laser that described the first testing fiber sends with respect to described light source.Described processor receives a plurality of light intensity sensors and the measured signal of angular transducer 12, and obtains corresponding numerical aperture and/or attenuation coefficient.
The experimental facilities of the present embodiment can be operated under two kinds of patterns: numerical aperture pattern and attenuation coefficient pattern, will describe with regard to these two kinds of patterns respectively below.
pattern one: numerical aperture pattern
Below in conjunction with Fig. 1, the working method of the experimental facilities of the present embodiment under numerical aperture pattern is described in detail.
Under numerical aperture pattern, in the light path of collimator 5 between focalizer 2 and the first testing fiber 6, preferably, three's central axis conllinear.This pattern can be the originate mode of this experimental facilities.Or in order to enter this pattern, the first actuating device 17 drives collimator 5 to enter in the light path between focalizer 2 and the first testing fiber 6.The effect of collimator 5 is exactly to make the light of focalizer outgoing become parallel beam, guarantees that incident angle all or that at least major part enters into the incident ray of the first testing fiber is consistent.
As shown in Figure 1, under this pattern, the laser beam 1 that laser instrument produces converges to diaphragm 3 by focalizer 2, and the first light intensity sensor 4 is equipped with in the exit of diaphragm 3, and Ear Mucosa Treated by He Ne Laser Irradiation enters the first end face of collimator 5, then from the second end face outgoing of collimator 5.As mentioned above, in the situation that the focusing effect of focalizer 2 is enough good, diaphragm 3 is omissible.In this case, laser directly focuses on the light inlet place of collimator 5.
Laser beam from the second end face outgoing of collimator 5, and incides the first end face of the first testing fiber 6 after collimator 5 collimation.Between collimator 5 and the first testing fiber 6, can carry out nothing and leak coupling, thereby guarantee that the light quantity that enters into testing fiber 6 equates with the light quantity that enters collimator.
Alternatively, the first light intensity sensor 4 can be arranged on the first end of the first testing fiber 6, i.e. light inlet place.Those skilled in the art can adjust as required voluntarily.The first light intensity sensor 4 is for measuring being about to enter the light intensity of the first testing fiber 6.
The second actuating device 16 is equipped with in the support bar bottom of the first testing fiber 6.On the first testing fiber 6 or its support bar, be attached with angular transducer 12.
Laser beam is by after the first testing fiber 6, enter into shading box 8, in shading box 8, there is half-reflecting half mirror 9, light beam is reflected through a half-reflecting half mirror part 9, and from the first light-emitting window of shading box 8 (side outlet) outgoing, enter into first end face (light inlet) of the second optical fiber 14, another part transmission is by half-reflecting half mirror 9, from the second light-emitting window outgoing of shading box 8.The second light-emitting window (right side outlet) at shading box 8 locates to be provided with the 3rd light intensity sensor 10.Second end face (light-emitting window) of the second optical fiber 14 is provided with the 4th light intensity sensor 13.All the sensors is connected with processor 11 by wire, can carry out signal communication.
In pattern once, light intensity sensor 13 is not worked under the control of processor 11.Processor 11 is controlled actuating device 16 rotates the first testing fiber 6 occurred levels, angular transducer 12 sends to processor 11 in real time by the angle value horizontally rotating, the light intensity value of light intensity sensor 10 light beam after by half-reflecting half mirror 9 by transmission sends to processor 11 in real time, processor 11 obtains corresponding relation or the curve map of angle and light intensity, and determines that based on this light intensity drops to the sine value of the half angle at maximal value 5% place.By the definition of numerical aperture, light intensity drops to the sine value of the half angle at maximal value 5% place, can obtain numerical aperture size.
Particularly, the first testing fiber 6 rotates under processor 11 is controlled, and the incident angle that the parallel beam sending from collimator 5 impinges upon fiber end face constantly changes.Like this after half-reflecting half mirror 9, from the size of the first testing fiber light intensity, also can change in real time, light intensity sensor 10 and angular transducer 12 are sent to processor 11 in real time by the light intensity recording and angle value respectively, and processor obtains the curve of a light intensity and incident angle.In the present embodiment, need to determine: when (1) first testing fiber 6 is placed along the optical axis of light beam, the light intensity that light intensity sensor 10 places record, this light intensity is largest light intensity; (2), when the light intensity of the laser that light intensity sensor 10 places record equals largest light intensity 5%, the first testing fiber is with respect to the angle of laser beam axis.
Initial time, light beam vertically enters testing fiber by collimator, and incident angle is zero degree, and the light intensity that light intensity sensor 10 places record is maximum.Then testing fiber turns clockwise, and incident angle constantly increases, and the light intensity that light intensity sensor 10 places record constantly reduces until while equaling largest light intensity 5%, the corresponding anglec of rotation is for determining the angle of numerical aperture.
Then, processor is determined the numerical aperture NA of the first testing fiber based on this angle
eff.
pattern two: attenuation coefficient pattern
The pattern two of the experimental facilities in the present embodiment is used for measuring attenuation coefficient.
As shown in Figure 2, when being in the state of pattern two, processor 11 is controlled actuating device 17, drives collimator 5 to move down, and leaves the light path of laser beam, that is, make itself and focalizer 2 and the first testing fiber 6 not on same axis.When collimator 5 leaves after the light path between focalizer and the first testing fiber, actuating device 17 and angular transducer 12 are not worked under processor 11 is controlled.
The laser line focus device 2 that laser instrument sends focuses on rear direct irradiation in the first end of the first testing fiber 6, or after 3 pairs of apertures of diaphragm are adjusted, is radiated at the first end of the first testing fiber 6.Laser beam in the first testing fiber 6, propagate after from its second end face outgoing.From the first testing fiber 6 emitting laser bundles, still enter shading box 8.In shading box 8, the light beam that enters shading box 8 by 9 pairs of half-reflecting half mirrors carries out light splitting.Part laser is reflected the first end face (light inlet) towards the second testing fiber 14, and another part laser, by half-reflecting half mirror 9 transmissions, leaves from a light-emitting window of shading box 8, and is radiated on light intensity sensor 10.Enter the light beam of the second testing fiber 14 from its second end face outgoing, and be radiated on the 4th light intensity sensor 13.Each light intensity sensor is transferred to measured separately light intensity in processor.
Fig. 3 is the partial enlarged view of the first testing fiber 6, shading box 8, half-reflecting half mirror 9 and the second testing fiber 14 in Fig. 2, while measuring attenuation coefficient for illustrating, and the variation of light intensity.Because the ratio of 9 permeable light intensity of half-reflecting half mirror is known, for example, selected in the present embodiment is that transmission and reflection are respectively 50% half-reflecting half mirror.So in the present embodiment, the light intensity recording based on light intensity sensor 7 places, can know the light intensity of the light beam that enters into the second testing fiber 14.
As shown in Figure 3, L
1and L
2represent respectively the length of two optical fiber that root timber material is identical, length is different, i.e. the length of the first testing fiber 6 and the second testing fiber 14.Suppose, incident intensity is I
0light beam after the first testing fiber 6, light intensity becomes I
1, then after the half-reflecting half mirror 9 of 50%:50%, the light intensity that enters into the second testing fiber 14 becomes 0.5I
1, then light beam from the other end of the second testing fiber 14 out light intensity become I
2.With reference to above-mentioned formula (1) and (2),
I
1=I
0(1-R)
2(1-A)
ne
-βL1
I
2=0.5I
1(1-R)
2(1-A)
n’e
-βL2
By by formula (1)/(2), obtain: I
1/ I
2=2I
0/ I
1e
-β (L1-L2)=2I
0/ I
1e
-β △ L,
△ L=L
1-L
2be the length difference of two optical fiber,
Formula distortion obtains: I
1 2/ 2I
0i
2=e
-β △ L
Natural logarithm is got on both sides, tries to achieve the attenuation coefficient β=(ln(I of optical fiber
1 2/ 2I
0i
2))/△ L.
Experimental facilities of the present invention, by adopting half-reflecting half mirror to carry out light splitting, adopts collimator to carry out light beam regulation, can between two kinds of patterns, switch easily, thus numerical aperture and the attenuation coefficient of measurement testing fiber, equipment is exquisite, easy to use.
It should be noted that, the shape of all parts in accompanying drawing is all schematically, does not get rid of that there is some difference with its true shape, and accompanying drawing 1-3 only, for principle of the present invention is described, is not intended to limit the invention.
It will be appreciated by those skilled in the art that the present invention can carry out with those described particular forms in addition, that do not depart from spirit of the present invention and intrinsic propesties herein.Therefore, the above-mentioned embodiment of all aspects should be interpreted as illustrative rather than restrictive.Scope of the present invention should be determined by the legal equivalents of appended claims and they, rather than determined by foregoing description, and all implication and changes within equivalency range that falls into appended claims all will be included.
It will be evident to one skilled in the art that, in appended claims, do not have the claim of explicitly quoting mutually to combine, as illustrative embodiments of the present invention, or be included and by modification afterwards, become new claim after submitting the application to.
Mode of the present invention
For carrying out best mode of the present invention, various embodiments have been described.
Industrial applicability
As apparent according to foregoing description institute, it will be apparent to one skilled in the art that and can make various modifications and variations to the present invention, and do not depart from the spirit or scope of the present invention.Therefore, be intended to the present invention and cover modification and the modification within the scope that falls into appended claims and their equivalent.
Claims (7)
1. an experimental facilities of measuring fibre-optic numerical aperture and attenuation coefficient, it is characterized in that, described experimental facilities comprises: light source, focalizer (2), a plurality of light intensity sensor, collimator (5), shading box (8), half-reflecting half mirror (9), processor (11), angular transducer (12), the first actuating device (17), the second actuating device (16), wherein, described experimental facilities is measured first testing fiber (6) of same configuration, different length and the second testing fiber (14)
Described light source is for Emission Lasers bundle;
Described focalizer (2) is assembled described laser beam, and the first light intensity sensor (4) is set near the focus of described focalizer;
The first end face of described the first testing fiber (6) receives described laser beam and exports described laser beam in the second end of described the first testing fiber (6), in the second end of described the first testing fiber (6), the second light intensity sensor (7) is set;
Described shading box (8) is arranged on the second end of described the first testing fiber (6), and receives the laser beam from described the first testing fiber (6) at the light inlet place of described shading box (8);
Described half-reflecting half mirror (9) is placed in described shading box (8), make the part of the laser beam that receives from the light inlet of described shading box (8) be reflected and leave described shading box towards the first surface feeding sputtering of described the second testing fiber (14) from the first light-emitting window of described shading box (8), another part transmission of the light beam receiving from the light inlet of described shading box (8) is also left described shading box (8) from the second light-emitting window of described shading box (8);
At the second light exit place of described shading box (8) and the second end of described the second testing fiber (14), the 3rd light intensity sensor (10) and the 4th light intensity sensor (13) are set respectively;
Described the first actuating device (17) is connected with described collimator (5), can drive described collimator (5) to enter or leave in the light path between described focalizer (2) and described the first testing fiber (6);
Described the second actuating device (16) is connected with described the first testing fiber (6), for driving the optical axis rotation of the laser that described the first testing fiber (6) sends with respect to described light source;
Described angular transducer (12) is measured the optical axis of the laser that described the first testing fiber (6) sends with respect to described light source and the angle of rotating;
Described processor (11) receives each light intensity sensor and the measured signal of described angular transducer (12), and received signal is processed.
2. experimental facilities as claimed in claim 1, is characterized in that, the reflection of described half-reflecting half mirror (9) and transmittivity are 50%:50%.
3. experimental facilities as claimed in claim 1, is characterized in that, described experimental facilities can be operated under two kinds of patterns: numerical aperture pattern and attenuation coefficient pattern.
4. experimental facilities as claimed in claim 3, it is characterized in that, under numerical aperture pattern, described the first actuating device (17) drives described collimator (5) to enter in the light path between described focalizer (2) and described the first testing fiber (6), and the laser beam that described focalizer (2) sends described light source focuses on the first end of described collimator (5), described laser beam from the second end face outgoing of described collimator (5), and incides the first end face of described the first testing fiber (6) after described collimator (5) collimation.
5. experimental facilities as claimed in claim 4, it is characterized in that, described the 3rd light intensity sensor (10) measure by the largest light intensity of the light beam of described half-reflecting half mirror (9) institute transmission and along with the light intensity of the light beam of the rotation institute transmission of described the first testing fiber (6) drop to largest light intensity 5% time, the angle that described the first testing fiber (6) rotates, described processor (11) is determined the numerical aperture of described the first testing fiber (6) based on described angle.
6. experimental facilities as claimed in claim 3, it is characterized in that, under attenuation coefficient pattern, described the first actuating device (17) drives described collimator (5) to leave the light path between described focalizer (2) and described the first testing fiber (6), and described focalizer (2) laser beam that described light source is sent focuses on the first end of described the first testing fiber (14).
7. experimental facilities as claimed in claim 6, it is characterized in that, the two length difference of the incident intensity of first end of described processor (11) based on described the first testing fiber, the output intensity of the second end, the output intensity of the second end of described the second testing fiber, described the first testing fiber and described the second testing fiber is determined the attenuation coefficient of described the first testing fiber and described the second testing fiber.
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| CN105180875A (en) * | 2015-10-21 | 2015-12-23 | 长飞光纤光缆股份有限公司 | Testing method for numerical aperture of bend-insensitive multimode fiber |
| CN106568581A (en) * | 2016-11-15 | 2017-04-19 | 中电科天之星激光技术（上海）有限公司 | Optical fiber numerical aperture measuring method |
| CN106802232A (en) * | 2017-03-16 | 2017-06-06 | 北京航空航天大学 | A kind of microcobjective numerical aperture measuring method and system based on total reflection |
| CN108827603A (en) * | 2018-09-03 | 2018-11-16 | 深圳市杰普特光电股份有限公司 | Semiconductor laser numerical aperture automatic test equipment and method |
| CN110082076A (en) * | 2019-05-29 | 2019-08-02 | 武汉楚星光纤应用技术有限公司 | Equipment and its detection method for detection fiber lens emerging beam off-axis angle |
| WO2024094230A1 (en) * | 2022-11-03 | 2024-05-10 | 长园视觉科技(珠海)有限公司 | Measurement device and measurement method for transmittance and numerical aperture of optical fiber |
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| CN105180875A (en) * | 2015-10-21 | 2015-12-23 | 长飞光纤光缆股份有限公司 | Testing method for numerical aperture of bend-insensitive multimode fiber |
| CN105180875B (en) * | 2015-10-21 | 2018-05-18 | 长飞光纤光缆股份有限公司 | A kind of test method of anti-bending multimode fiber numerical aperture |
| CN106568581A (en) * | 2016-11-15 | 2017-04-19 | 中电科天之星激光技术（上海）有限公司 | Optical fiber numerical aperture measuring method |
| CN106802232A (en) * | 2017-03-16 | 2017-06-06 | 北京航空航天大学 | A kind of microcobjective numerical aperture measuring method and system based on total reflection |
| CN108827603A (en) * | 2018-09-03 | 2018-11-16 | 深圳市杰普特光电股份有限公司 | Semiconductor laser numerical aperture automatic test equipment and method |
| CN110082076A (en) * | 2019-05-29 | 2019-08-02 | 武汉楚星光纤应用技术有限公司 | Equipment and its detection method for detection fiber lens emerging beam off-axis angle |
| WO2024094230A1 (en) * | 2022-11-03 | 2024-05-10 | 长园视觉科技(珠海)有限公司 | Measurement device and measurement method for transmittance and numerical aperture of optical fiber |
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