CN109668516A - A kind of optical fiber far-field scanning instrument based on worm and gear - Google Patents
A kind of optical fiber far-field scanning instrument based on worm and gear Download PDFInfo
- Publication number
- CN109668516A CN109668516A CN201811633892.3A CN201811633892A CN109668516A CN 109668516 A CN109668516 A CN 109668516A CN 201811633892 A CN201811633892 A CN 201811633892A CN 109668516 A CN109668516 A CN 109668516A
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- optical fiber
- photodetector
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- field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of optical fiber far-field scanning instrument based on worm and gear, belongs to test optical fiber instrument field, including optical fiber far-field scanning turntable and low current signal acquisition system；Wherein, optical fiber far-field scanning turntable includes mechanical transmission mechanism, optical fiber regulating system, angle measurement unit and focusing microscope system；Low current signal acquisition system, including photodetector and photodetector bracket, photodetector are mounted on photodetector bracket, and photodetector bracket is mounted on the surface of angle measurement unit.Scanning angle range of the present invention is big, Scanning step angle is small, far-field angle positioning accuracy is high, the problem that measurement accuracy is low, measurement reproducibility is poor existing for variable orifice shot measurement mode field diameter can be effectively eliminated, and far-field scanning method can be by along axial-rotation fiber angle, the mode field diameter of the non-circular symmetry optical fiber such as polarization maintaining optical fibre is tested, there is stronger scalability.
Description
Technical field
The invention belongs to optical fiber parameter field of test instrument, and in particular to a kind of optical fiber far-field scanning based on worm and gear
Instrument.
Background technique
In optical fiber transmission process, the energy of light not fully concentrates in fibre core light, some light is to pass through covering
Transmission.So people use mode field diameter rather than core diameter as description single mode optical fiber in luminous energy intensity physical quantity.Mould field
Diameter characterizes distribution of the basic mode light in single mode optical fiber fibre core, the size and its tolerance of mode field diameter and the company of optical fiber
Connecing loss, transverse property etc. has close relationship.Furthermore according to mode field diameter with the change curve of wavelength, may be used to determine
The cutoff wavelength of single mode optical fiber, and the abbe number of optical fiber can be estimated.Therefore in the development of optical fiber, the stretching of optical fiber, optical fiber
In the practical applications such as stranding, laying optical cable and construction connecting, require to carry out precise measurement to mode field diameter.
Measuring instrument currently used for mode field diameter parameter is mainly optical fiber comprehensive parameter tester, and principle is based on can
Variable orifice shot, by the test to optical power under different pore size under turntable with holes, numerical integration obtains the mode field diameter number of optical fiber
Value.Specific measuring principle is as shown in Figure 2:
The optical system of device is made of micropositioning stage, lens system and photodetector, is mainly characterized by micropositioning stage
Between lens system, it is mounted with a turntable vertical with optical axis, i=0,1 ..., n holes of different sizes are provided on turntable
Diameter diaphragm, radius xi, tested optical fiber end face is D with a distance from disk, and the far field half-angle corresponding to each hole is θi, numerical aperture
Diameter is sin θi.The rotation of turntable can be such that the center of these circular holes falls on optical axis.When measurement, turntable is rotated in order, is measured
By the optical power P (x) of respective aperture x, mode field diameter is then calculated according to formula (1).
In formula:X=Dtan θ；
The distance (mm) of D --- fiber exit end face to aperture center；
X --- aperture radius (mm)；
θ --- angle (o) of the fiber exit end face to bore edges line and optical axis；
P (x) --- through the optical power (mW) in the hole that radius is x；
Pmax--- the optical power (mW) when through maximum diameter of hole.
Variable orifice shot requires own optical system to have sufficiently large numerical aperture, is able to satisfy " the full note of tested optical fiber
Enter " condition.Circular hole quantitative requirement on turntable at least 12, and diameter is different, and these circle hole radius are to tested light
The numerical aperture of fibre outgoing end face subtended angle wants that 0.02~0.4 can be covered.
The advantages of variable orifice shot is that device composition is relatively easy, and measuring speed is fast.But the program there are two aspect
Disadvantage: 1) Instrument measuring precision and the aperture number on turntable are closely related, the aperture number of turntable with holes 19~23 it
Between, sampled point is very few, causes sampling precision inadequate；2) turntable positioning accuracy in rotary course is relatively low, according to variable orifice shot
Measuring principle, rotation turntable require the center of circle in aperture parallel with optical axis in the process.But there can be aperture during actual rotation
The phenomenon that center of circle and optical axis deviation, causes instrument test repeatability not high, and the franchise of instrument is even as high as 0.5 μm.
Summary of the invention
For the above-mentioned technical problems in the prior art, the invention proposes a kind of optical fiber based on worm and gear is remote
Field scan instrument, design rationally, overcome the deficiencies in the prior art, have good effect.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of optical fiber far-field scanning instrument based on worm and gear, including optical fiber far-field scanning turntable and low current signal are adopted
Collecting system；Wherein, optical fiber far-field scanning turntable includes mechanical transmission mechanism, optical fiber regulating system, angle measurement unit and focuses micro-
Mirror system；Low current signal acquisition system, including photodetector and photodetector bracket, photodetector are mounted on light
On electric explorer bracket, photodetector bracket is mounted on the surface of angle measurement unit；
Mechanical transmission mechanism is configurable for realizing -60 °~+60 ° of angular range, with 0.06 ° of scanning stepping into
Row rotation；It includes the rotating electric machine based on worm and gear；
Optical fiber regulating system is configured for the axially and radially position of adjustment testing fiber, it is ensured that testing fiber end face
It is placed exactly in the center location of the running track of rotating electric machine；It includes fiber clamp, fiber clamp base and stepping actuator,
Fiber clamp is mounted in fiber clamp base, and stepping actuator is mounted on the side of fiber clamp base；
Angle measurement unit is configurable for the rotation angle of real-time detection photodetector；It includes circle synchronous inductor,
Circle synchronous inductor is mounted on the surface of rotating electric machine；
Focusing microscope system is configurable for carrying out the programmable automation positioning of testing fiber radial position；It is wrapped
LED backlight and digital camera are included, LED backlight is mounted on the front section of fiber clamp base, and digital camera is located at
The surface of LED backlight and LED backlight are on the same optical axis direction；
Low current signal acquisition system is configurable for doing circular scanning stepping around testing fiber end face, in real time
Detect the far field construction light distribution P (θ) of testing fiber end face under different scanning angle, θ.
Advantageous effects brought by the present invention:
It is compared to existing frequently-used variable orifice shot, the present invention adds the optical fiber of round synchronous inductor remote using worm and gear
Field scan turntable, scanning angle range is big, and Scanning step angle is small, and far-field angle positioning accuracy is high, can effectively eliminate variable orifice
Shot measures the problem that measurement accuracy is low, measurement reproducibility is poor existing for mode field diameter；And far-field scanning method can pass through
The angle of spin fiber tests the mode field diameter of non-circular symmetry optical fiber；In addition, can be according to reality in test process
Measuring accuracy requires that corresponding far-field scanning angle and Scanning step angle is arranged, and has stronger scalability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the optical fiber far-field scanning instrument based on worm and gear.
Fig. 2 is variable orifice shot measuring system schematic diagram.
Fig. 3 is far-field scanning method the system composition block diagram.
Wherein, rotating electric machine of the 1- based on worm and gear；2- fiber clamp；3- fiber clamp base；4- stepping actuator；
5-LED backlight；6- digital camera；7- justifies synchronous inductor；8- photodetector；9- photodetector bracket.
Specific embodiment
With reference to the accompanying drawing and specific embodiment invention is further described in detail:
From the definition of mode field diameter in the present invention, devises a kind of far-field scanning turntable based on worm and gear and adopt
With the Larger Dynamic range that small area InGaAs detector is front end, lock-in amplifier is rear end, highly sensitive faint optical fiber far field
The optical fiber far-field scanning instrument of light signal collection processing system.Concrete scheme design is as shown in Figure 3:
A kind of optical fiber far-field scanning instrument based on worm and gear, structure is as shown in Figure 1, include optical fiber far-field scanning turntable
With low current signal acquisition system；Wherein, optical fiber far-field scanning turntable includes mechanical transmission mechanism, optical fiber regulating system, surveys
Angle unit and focusing microscope system；Low current signal acquisition system, including photodetector 8 and photodetector bracket 9,
Photodetector 8 is mounted on photodetector bracket 9, and photodetector bracket 9 is mounted on the surface of angle measurement unit；
Mechanical transmission mechanism is configurable for realizing -60 °~+60 ° of angular range, with 0.06 ° of scanning stepping into
Row rotation；It includes the rotating electric machine 1 based on worm and gear；
Optical fiber regulating system is configured for the axially and radially position of adjustment testing fiber, it is ensured that testing fiber end face
It is placed exactly in the center location of the running track of rotating electric machine；It includes that fiber clamp 2, fiber clamp base 3 and stepping actuate
Device 4, fiber clamp 2 are mounted in fiber clamp base 3, and stepping actuator 4 is mounted on the side of fiber clamp base 3；
Angle measurement unit is configurable for the rotation angle of real-time detection photodetector；It includes circle synchronous inductor
7, circle synchronous inductor 7 is mounted on the surface of rotating electric machine 1；
Focusing microscope system is configurable for carrying out the programmable automation positioning of testing fiber radial position；It is wrapped
LED backlight 5 and digital camera 6 are included, LED backlight 5 is mounted on the front section of fiber clamp base 3, digital camera 6
Positioned at the surface of LED backlight 5 and LED backlight 5 on the same optical axis direction；
Low current signal acquisition system is configurable for doing circular scanning stepping around testing fiber end face, in real time
Detect the far field construction light distribution P (θ) of testing fiber end face under different scanning angle, θ.
Furthermore small area pixilated detectors is used to adopt in invention for the faint light intensity signal that front end, lock-in amplifier are rear end
The optical fiber far field light intensity signal collection of up to 90dB dynamic range may be implemented in collecting system, realizes the faint photoelectric current letter of pA magnitude
Number acquisition extract, to realize the test of Larger Dynamic range, highly sensitive faint light intensity signal.
In test process, the light source through ovennodulation is coupled to be injected into testing fiber, is adjusted by optical fiber regulating system to be measured
Optical fiber, it is ensured that testing fiber end face is placed exactly in the center location of rotating electric machine running track.Optical fiber far-field scanning turntable is by counting
The program-controlled generation circumference step-scan of calculation machine master control borad, the photodetector being mounted on rotating electric machine detect different scanning in real time
The far field construction light field P (θ) of fiber end face under angle, θ；It is corresponding micro- with the lock-in amplifier real-time detection of light source synchronous modulation
Weak current signal.The photo-current intensity value tested by lock-in amplifier under detection different rotary angle, just realizes remote in this way
Far-field distribution light intensity data in field scan instrument about optical fiber under different far-field scanning angles.Then mould is measured according to far-field scanning method
The mode field diameter of tested optical fiber is calculated in the formula (2) of field diameter, numerical value.
Mechanical transmission mechanism based on worm and gear can drive the photodetection being mounted on photodetector bracket
Device, around fiber end face from -60 °~+60 ° of far-field angle, with the Scanning step angle lower than 0.1 ° to the far field construction light of optical fiber
It is detected by force；The angle measurement unit of circle synchronous inductor and digital display meter composition can detect the rotation angle of mechanical transmission mechanism in real time
Degree, by control system feedback regulation, realizes high-precision far-field angle positioning accuracy, effectively improves the measurement reproducibility of instrument；Base
In the low current signal acquisition system of small area detector and lock-in amplifier, it is able to detect the faint light electricity of fA~μ A rank
Signal is flowed, the dynamic range of whole system is up to 90dB, it can satisfy the side lobe effect test in mode field diameter test process,
It is able to satisfy the testing requirement of special optical fiber mode field diameter in a period of time from now on.
It is compared to existing frequently-used variable orifice shot, the present invention adds the optical fiber of round synchronous inductor remote using worm and gear
Field scan turntable, scanning angle range is big, and Scanning step angle is small, and far-field angle positioning accuracy is high.Variable orifice can be effectively eliminated
Shot measures the problem that measurement accuracy is low, measurement reproducibility is poor existing for mode field diameter.And far-field scanning method can pass through
The angle of spin fiber tests the mode field diameter of the asymmetry optical fiber such as polarization maintaining optical fibre；In addition, can be in test process
Corresponding far-field scanning angle and Scanning step angle are set according to actual test required precision, there is stronger scalability.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (1)
1. a kind of optical fiber far-field scanning instrument based on worm and gear, it is characterised in that: including optical fiber far-field scanning turntable and faint
Current signal acquisition system；Wherein, optical fiber far-field scanning turntable includes mechanical transmission mechanism, optical fiber regulating system, angle measurement unit
With focusing microscope system；Low current signal acquisition system, including photodetector and photodetector bracket, photodetection
Device is mounted on photodetector bracket, and photodetector bracket is mounted on the surface of angle measurement unit；
Mechanical transmission mechanism is configurable for realizing -60 °~+60 ° of angular range, is revolved with 0.06 ° of scanning stepping
Turn；It includes the rotating electric machine based on worm and gear；
Optical fiber regulating system is configured for the axially and radially position of adjustment testing fiber, it is ensured that testing fiber end face is just
Positioned at the center location of the running track of rotating electric machine；It includes fiber clamp, fiber clamp base and stepping actuator, optical fiber
Fixture is mounted in fiber clamp base, and stepping actuator is mounted on the side of fiber clamp base；
Angle measurement unit is configurable for the rotation angle of real-time detection photodetector；It includes circle synchronous inductor, and circle is same
Step inductor is mounted on the surface of rotating electric machine；
Focusing microscope system is configurable for carrying out the programmable automation positioning of testing fiber radial position；It includes LED
Backlight and digital camera, LED backlight are mounted on the front section of fiber clamp base, and digital camera is located at LED back
The surface of light source and LED backlight are on the same optical axis direction；
Low current signal acquisition system is configurable for doing circular scanning stepping, real-time detection around testing fiber end face
The far field construction light distribution P (θ) of testing fiber end face under different scanning angle, θ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811633892.3A CN109668516A (en) | 2018-12-29 | 2018-12-29 | A kind of optical fiber far-field scanning instrument based on worm and gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811633892.3A CN109668516A (en) | 2018-12-29 | 2018-12-29 | A kind of optical fiber far-field scanning instrument based on worm and gear |
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| CN109668516A true CN109668516A (en) | 2019-04-23 |
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| CN201811633892.3A Pending CN109668516A (en) | 2018-12-29 | 2018-12-29 | A kind of optical fiber far-field scanning instrument based on worm and gear |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN110471146A (en) * | 2019-08-29 | 2019-11-19 | 广州奥鑫通讯设备有限公司 | A kind of fiber coupler test tool structure part |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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