CN110132545A - A kind of method of substitution fibre loss characteristic test test macro and method - Google Patents
A kind of method of substitution fibre loss characteristic test test macro and method Download PDFInfo
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- CN110132545A CN110132545A CN201910369063.7A CN201910369063A CN110132545A CN 110132545 A CN110132545 A CN 110132545A CN 201910369063 A CN201910369063 A CN 201910369063A CN 110132545 A CN110132545 A CN 110132545A
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- 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
- G01M11/02—Testing optical properties
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- 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
- G01M11/333—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 using modulated input signals
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- 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
- G01M11/335—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 using two or more input wavelengths
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Abstract
The invention belongs to method of substitution fibre loss characteristic test system and the teaching and experiment equipment technical fields of method, disclose a kind of measuring system and method with method of substitution measurement fibre loss characteristic.It is provided with light source module, fiber channel, XOR logic optical fiber length measuring module, optical power indicator and double track digital oscilloscopes.Light source module: there are four types of the light-emitting windows of wavelength (630,860,1310 and 1550nm)；Optical fiber length measuring module: there are modulating signal source, modulated signal electric light/photoelectric conversion and regenerative circuit, XOR logic and double-bevel analog to digital conversion circuit；Optical power indicating module: for 630,860nm wavelength, with SPD photoelectric probe, for 1310 and 1550nm wavelength, with PIN photoelectric probe.Compared with the existing technology, the present invention has many advantages, such as that equipment is simple and convenient to operate, and is very suitable to the teaching demand more than participation experiment number of student.
Description
Technical field
Formula system and method technical field is surveyed the invention belongs to fibre loss characteristic test more particularly to a kind of uses method of substitution
Measure the experiment test system and method for fibre loss characteristic.
Background technique
Light wave is lossy during optical fiber transmits, and the size of loss is related with optical wavelength.The institute of fiber optic communication
Can become a reality, it is primarily due to the raising of fiber making processes, so that optical fiber has the light wave of several special wavelengths
Very low transmission is lost.These wavelength are known as the window wavelength of optical fiber, they are: 860nm, 1310nm and 1550nm......
Wavelength is in the light wave in visible light wave spectral limit, and the transmission loss of optical fiber is all very big, is not suitable for making optical signal in fiber optic communication
Carrier wave.
Traditional fibre loss characteristic test system obtains different wave length after light splitting with the light source with continuous spectrum
Excitation light, and using cutback technique measurement optical fiber loss.Although traditional cutback technique fibre loss characteristic test system measures
As a result accurate, but structure is complicated, at high cost for related light source and matched light-dividing device.Moreover, cutback technique measurement fibre loss is special
Property be a kind of destructive measurement method, needed in each measurement process to fiber end face processing, will to light source device photoelectric device with
Light coupling issues between fiber channel carry out a large amount of process.This testing department in research unit or fibre-optical drawing factory
It is suitble to, needs as instruments used for education in face of a large amount of students, and the place of above-mentioned complexity can not be completed in class hour limited situation
Reason process.The present invention makees light source device instead of the light of continuous spectrum in cutback technique using the semiconductor laser of different emission wavelengths
After source device and its light-dividing device, keep fibre loss characteristic measuring system small in size, at low cost.The present invention can be made using method of substitution
Student completes the experiment content in relation to fibre loss characteristic within limited class hour.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of method of substitution fibre loss characteristic test test macros
And method.
The invention is realized in this way a kind of fibre loss characteristic test test macro, the fibre loss characteristic test
Test macro includes:
Light source module, the semi-conductor electricity optical device equipped with tetra- kinds of wavelength of 630nm, 860nm, 1310nm and 1550nm have each
From light-emitting window；630nm red-light source is provided by feux rouges pen；The driving circuit of 1550nm long wavelength semiconductor laser is patrolled with exclusive or
Optical fiber length measuring module is collected to share；
Fiber channel module, length are two disk of multimode fibre of 200m and 1200m, secondary fixed, band FC plug and connection
Device；
Optical fiber length measuring module has modulating signal source, modulated signal electric light/photoelectric conversion and regenerative circuit, exclusive or
Logic fiber lengths sensor and double-bevel analog to digital conversion circuit；
Optical power indicating module makees photoelectric probe with SPD photodiode, indicates model for 630nm and 860nm wavelength
Enclose 0-200 microwatt；For 1310nm and 1550nm wavelength, make photoelectric probe with PIN photodiode, indicating range 0-2000 is micro-
Watt.
Further, the optical fiber length measuring module modulated signal is to believe for 32 delicate, duty ratio 50% square waves in the period
Number, light source device luminous intensity is modulated, optical signal is coupled to optical fiber with optical patchcord and fiber active linker and is believed
Road one end；Optical signal experience certain time is transferred to the fiber channel other end, carries out photoelectricity to optical signal with photodiode and turns
After changing and regenerating adjusting, obtaining a duty ratio is 50% regeneration electric signal；The reference telecommunications synchronous with transmitting terminal optical signal
Number and the regeneration electric signal of receiving end be connected to two input terminals of XOR logic fiber lengths sensor；XOR circuit it is defeated
7107 double-bevel analog to digital conversion circuit V in+ feet are terminated out；It is living that 7107 analog to digital conversion circuit V in- feet connect zero point adjusting potentiometer
Moved end, 7107 analog to digital conversion circuit V ref+ feet connect calibration and adjust potentiometer movable end.
The optical fiber damage based on the fibre loss characteristic test test macro that another object of the present invention is to provide a kind of
Characteristic test test method is consumed, the fibre loss characteristic test test method includes:
The first step connects measuring system, measures the two coiled optical fiber channels provided with XOR logic optical fiber length measuring instrument
Length；
Second step, the long optical fibers channel access measuring system for being L length；LD electric current is adjusted to 20mA, reads optical power
Display number, and it is denoted as pL；It is L with length in the case where keeping the constant situation of LD electric currentOShort fiber channel instead of long optical fibers believe
Road access；Optical power display number is read, and is denoted as pLo；
Third step accesses measuring system with the light source device of different wave length, repeats above operation；
4th step can calculate the optical fiber loss factor of four kinds of wavelength according to the above measurement data.
Further, the principle of the fibre loss characteristic test test method is:
By definition, optical fiber loss factor；
α=10log (pin/pout)/L(dB/km)；
Wherein pinInput optical power, p for optical fiberoutOutput optical power, L for optical fiber are the length of optical fiber.
So-called method of substitution measures fibre loss, and exactly such as attached drawing 8 (a) shows, the long optical fibers channel access for being first L length
Measuring system, it is that the tested optical fiber that length is L enters fine light function that wherein P0, which is fiber optical power, the P1 out of light source device LD tie jumper,
Rate, P2 are to be for fiber optical power, the P (L) out that the optical power at L0, P3 are tested optical fiber terminals apart from tested optical fiber starting point
The incident optical power of PIN photodetector part；
Po/P (L)=(Po/P1) * (P1/P2) * (P2/P3) * { P3/P (L) }；
Log { Po/P (L) }=Log (Po/P1)+Log (P1/P2)+Log (P2/P3)+Log { P3/P (L) }；So；
αL=α1+αab+αbc+α2；
Wherein: αLFor the total losses of the measuring system；α1The junction loss of ring flange 1；αabFor AB sections of damage of L long optical fibers
Consumption；αbcFor BC sections of the loss of L long optical fibers；α2For the junction loss of ring flange；Wherein transmission of AB sections of the loss in addition to guided modes
Loss is outer, and there are also the radiation mode loss of starting point；Then such as attached drawing 8 (b) shows, is L with length0Short fiber channel replace long light
Fine channel access measuring system is coupled to photoelectricity testing part to by ring flange and optical patchcord in same test device
Optical power measured again, measurement result is denoted as P (L0)；When second of measurement, the total losses of measuring system are write as:
αL0=α1’+αab+α2'；
Wherein αL0The total losses of system when being measured for second；α1, it is the junction loss of ring flange 1；αabFor L0 long optical fibers
Loss；α2' be ring flange 2 junction loss；If front and back measure twice in junction loss α1With α1’、α2With α2' difference and BC
The loss α of section optical fiberbcIt is set up compared to very little, following relationship approximation:
αbc=αL-αL0；
The loss factor of tested optical fiber:
α=(αL-αL0)/(L-L0)
=10log [p (L)/p (Lo)]/(L-L0)(dB/km)。
Further, the XOR logic method optical fibre length measurement method in the fibre loss characteristic test test method are as follows:
With the period 32 is delicate, square wave electrical signal signal of duty ratio 50% makees modulated signal, the hair of noise spectra of semiconductor lasers
Luminous intensity is modulated, and generates that a cycle 32 is delicate, square wave optical signal of duty ratio 50%；With optical patchcord and optical fibre
Optical signal is coupled to tested optical fiber one end from LD light-emitting window by connector；It is another that optical signal experience certain time is transferred to tested optical fiber
Behind one end, photoelectric conversion carried out to optical signal with PIN photodiode and after regeneration adjusts, obtaining a duty ratio is 50% again
Raw electric signal；Select an electric signal synchronous with optical signal as reference signal in modulated signal electro-optical conversion circuit；?
Regeneration electrical signal in reference signal output end and modulated signal electro-optical conversion circuit is connected to XOR logic fiber lengths
Two input terminals of sensor；XOR circuit output end is connected to 7107 double-bevel analog-to-digital conversions and digital display electricity through bleeder circuit
The end Vin+ on road；The Vin- of 7107 double-bevel analog-to-digital conversions and Digital Display Circuit termination zero point adjusting potentiometer movable end, 7107 pairs
The Vref+ of inclined analog-to-digital conversion and Digital Display Circuit termination calibration adjusts potentiometer movable end；Measure the fiber lengths of fiber channel
Operating procedure be: when fiber channel length is zero, regenerated signal duty ratio be 50% state under, adjust zero point adjust current potential
Device makes the number of 7107 double-bevel analog-to-digital conversions and Digital Display Circuit be shown as 0000；Then zero point is kept to adjust the adjusting of potentiometer
State is constant, and 200m long standard fiber incoming fiber optic length measuring system, regenerated signal duty ratio is to adjust under 50% state
Calibration, which adjusts potentiometer, makes the number of 7107 double-bevel analog-to-digital conversions and Digital Display Circuit be shown as 0200；Complete zero point adjust and
After calibration is adjusted, after the fiber channel incoming fiber optic length measuring system of unknown lengths, regenerated signal duty ratio is 50% shape
The number of the number display of 7107 double-bevel analog-to-digital conversions and Digital Display Circuit is exactly the length of tested optical fiber under state.
In conclusion advantages of the present invention and good effect are as follows:
It is different that traditional fibre loss characteristic test system uses light source equipment and light splitting technology with continuous spectrum to obtain
The excitation light of wavelength, and utilize the loss of cutback technique measurement optical fiber.The device structure of test macro is complicated, bulky, cost
It is high.Moreover, cutback technique test optical fiber loss characteristic is a kind of destructive measurement method, need in each measurement process to fiber end face
Processing will carry out a large amount of process to the light coupling issues between light source device and photoelectric device and fiber channel and adjust meticulously
It is whole.This is suitble in the testing department of research unit or fibre-optical drawing factory, needs as instruments used for education in face of a large amount of students, and
The processing and adjustment process of above-mentioned complexity can not be completed in class hour limited situation.The present invention is using the half of different emission wavelengths
After conductor laser makees light source and light-dividing device of the light source device instead of continuous spectrum in cutback technique, make fibre loss feature measurement
System bulk is small, at low cost.The present invention uses method of substitution, easy to operate during the experiment, without to fiber end face processing, nothing
The problems such as optical coupling between light source device and photoelectric device and fiber channel need to be adjusted meticulously, it can make student within limited class hour
Complete the experiment content in relation to fibre loss characteristic.
Detailed description of the invention
Fig. 1 is method of substitution fibre loss characteristic test test system structure schematic diagram provided in an embodiment of the present invention；
Fig. 2 is provided in an embodiment of the present invention 860,1310nm light source device driving circuit；
Fig. 3 is 1550nm light source device driving circuit provided in an embodiment of the present invention；
Fig. 4 is XOR logic optical fiber length measuring modular structure schematic diagram provided in an embodiment of the present invention；
Fig. 5 is modulated signal electro-optical conversion circuit schematic diagram provided in an embodiment of the present invention；
Fig. 6 is modulated signal photoelectricity conversion provided in an embodiment of the present invention and regenerative circuit schematic diagram；
Fig. 7 is XOR logic fiber lengths sensor and double-bevel analog to digital conversion circuit provided in an embodiment of the present invention；
Fig. 8 is the schematic illustration of method of substitution measurement optical fiber loss factor provided in an embodiment of the present invention；
In Fig. 1: 1, light source module；2, fiber channel module；3 optical fiber length measuring modules；4, optical power indicating module；5,
Digital oscilloscope.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Fig. 1, method of substitution fibre loss characteristic test experimental system provided in an embodiment of the present invention includes: light source
Module 1, fiber channel module 2, XOR logic optical fiber length measuring module 3, optical power indicator 4 and digital oscilloscope 5.
Light source module 1: with there are four types of the semi-conductor electricity optical device of wavelength (630nm, 860nm, 1310nm and 1550nm), have
Respective light-emitting window.Wavelength is that the light source device of 860nm, 1310nm use same one drive circuit, as attached drawing 2 shows；630nm feux rouges
Light source is provided by feux rouges pen；The driving circuit and XOR logic optical fiber length measuring module 3 of 1550nm long wavelength semiconductor laser
It shares, sees attached drawing 3.
Fiber channel module 2: length is two disk of multimode fibre of 200m or so and 1200m or so, and secondary fixed, band FC is inserted
Head and connector.
Optical fiber length measuring module 3: the structural schematic diagram of the module such as attached drawing 4 shows there is modulating signal source, modulated signal
Electric light/photoelectric conversion and regenerative circuit, XOR logic fiber lengths sensor and double-bevel analog to digital conversion circuit.Modulated signal is
Period is 32 delicate, duty ratio 50% square-wave signals, is modulated to light source device luminous intensity, with optical patchcord and optical fiber
Optical signal is coupled to fiber channel one end by flexible jumper；Optical signal experience certain time is transferred to the fiber channel other end,
After carrying out photoelectric conversion and regeneration adjusting to optical signal with photodiode, obtaining a duty ratio is 50% regeneration electric signal；
The regeneration electric signal of the reference electrical signal synchronous with transmitting terminal optical signal and receiving end is connected to XOR logic fiber lengths sensing
Two input terminals of device；The output of XOR circuit terminates 7107 double-bevel analog to digital conversion circuit V in+ feet；7107 moduluses turn
It changes circuit V in- foot and connects zero point adjusting potentiometer movable end, 7107 analog to digital conversion circuit V ref+ feet connect calibration and adjust potentiometer
Movable end.Modulated signal electro-optical conversion circuit schematic diagram such as attached drawing 5 shows, the conversion of modulated signal photoelectricity and regeneration adjust circuit theory
Figure attached drawing 6 shows, XOR logic fiber lengths sensor and double-bevel analog to digital conversion circuit such as attached drawing 7 show.
Optical power indicating module 4: for 630nm and 860nm wavelength, make photoelectric probe with SPD photodiode, indicate model
Enclose 0-200 microwatt；For 1310nm and 1550nm wavelength, make photoelectric probe with PIN photodiode, indicating range 0-2000 is micro-
Watt.
XOR logic method optical fiber provided in an embodiment of the present invention based on fibre loss characteristic test test macro and method
Length measurement method are as follows:
With the period 32 is delicate, square wave electrical signal signal of duty ratio 50% makees modulated signal, the hair of noise spectra of semiconductor lasers
Luminous intensity is modulated, and generates that a cycle 32 is delicate, square wave optical signal of duty ratio 50%.With optical patchcord and optical fibre
Optical signal is coupled to tested optical fiber one end from LD light-emitting window by connector.It is another that optical signal experience certain time is transferred to tested optical fiber
Behind one end, photoelectric conversion carried out to optical signal with PIN photodiode and after regeneration adjusts, obtaining a duty ratio is 50% again
Raw electric signal.Select an electric signal synchronous with optical signal as reference signal in modulated signal electro-optical conversion circuit.?
Regeneration electrical signal in reference signal output end and modulated signal electro-optical conversion circuit is connected to XOR logic fiber lengths
Two input terminals of sensor.XOR circuit output end is connected to 7107 double-bevel analog-to-digital conversions and digital display electricity through bleeder circuit
The end Vin+ on road.The Vin- of 7107 double-bevel analog-to-digital conversions and Digital Display Circuit termination zero point adjusting potentiometer movable end, 7107 pairs
The Vref+ of inclined analog-to-digital conversion and Digital Display Circuit termination calibration adjusts potentiometer movable end.Measure fiber channel fiber lengths
Operating procedure is: when fiber channel length is zero, regenerated signal duty ratio is under 50% state, and adjusting zero point adjusting potentiometer makes
7107 double-bevel analog-to-digital conversions and the number of Digital Display Circuit are shown as 0000；Then zero point is kept to adjust the adjusting shape of potentiometer
State is constant, and 200m long Standard Fibre Channel incoming fiber optic length measuring system, regenerated signal duty ratio is to adjust under 50% state
Section calibration, which adjusts potentiometer, makes the number of 7107 double-bevel analog-to-digital conversions and Digital Display Circuit be shown as 0200.Zero point is completed to adjust
After adjusting with calibration, after the fiber channel incoming fiber optic length measuring system of unknown lengths, regenerated signal duty ratio is 50%
The number of the number display of 7107 double-bevel analog-to-digital conversions and Digital Display Circuit is exactly the length of tested optical fiber under state.
Method of substitution optical fiber damage provided in an embodiment of the present invention based in fibre loss characteristic test test macro and method
Consume the measurement method of characteristic are as follows:
By definition, optical fiber loss factor:
α=10log (pin/pout)/L (1)
Wherein pinIndicate input optical power, the p of optical fiberoutIndicate that the Output optical power of optical fiber, L indicate the length of optical fiber.On
The unit dB/km (decibel/kilometer) for the loss factor α that formula defines.
The principle signal of measurement optical fiber loss factor is such as schemed attached 8 (a) and is shown.Wherein P0 is light source device LD through tie jumper
Out fiber optical power, P1 be length be L tested optical fiber incident optical power, P2 is apart from tested optical fiber starting point is light function at L0
Rate, P3 are that fiber optical power, the P (L) out of tested optical fiber terminal are the incident optical powers of PIN photodetector part.Cause are as follows:
Po/PL=(Po/P1)*(P1/P2)*(P2/P3)*(P3/PL)；
That is,
Log(Po/PL)=Log (Po/P1)+Log(P1/P2)+Log(P2/P3)+Log(P3/PL)；So；
Wherein there are also the radiation mode loss of starting point other than the transmission loss of guided modes for AB sections of loss.Light wave is in optical fiber
After middle transmission long enough distance, optical power can be just set up by the Stable distritation state of mode.In attached drawing 8 (a), if light
Wave has reached optical power after Lo distance by the Stable distritation state of mode in optical fiber, and the loss in BC sections of optical fiber is
It is our transmission loss to be measured.So measuring αbcWith the loss factor that can calculate tested optical fiber after the length of BC sections of optical fiber
α。
The practical operation step that method of substitution measures fibre loss is exactly the system for using attached drawing 8 (a) to show, is L measuring length
Optical fiber be coupled to the optical power P of photoelectric detector by ring flange 2 and optical patchcordLAfterwards, the fiber light of light source device is kept
Power P0It is constant, it is L with length if attached drawing 8 (b) shows0Short fiber (but length wants long enough) replace long optical fibers, in same survey
Trial assembly is set measures the optical power for being coupled to photoelectricity testing part by ring flange 2 and optical patchcord again, measurement knot
Fruit is denoted as PL0。
When second of measurement, the total losses of measuring system can be write as:
Assuming that: ring flange 1 and the junction loss having the same of ring flange 2 when measuring twice；Two disk tested optical fibers are identical
Length on have same transmission loss.
So (2) formula obtains after subtracting (3) formula:
αL-αL0=αbc；
The then transmission loss of tested optical fiber:
So measuring L with all XOR logic optical fiber length measuring modules of this instrument0After L, according to the P measuredL0
And PL, (4) formula of utilization can calculate the loss factor of tested optical fiber.
In practical situations, first assumed condition is invalid, and the junction loss of ring flange is always variant, when tested light
When fine very long can the influence this species diversity to fiber transmission attenuation measurement result reduce to not half.Certainly, with cutback technique
The accuracy for comparing measurement result will almost, but fibre loss is apparent with this physical phenomenon of wavelength change.
Measurement data:
With (4) formula to the calculated result of the loss of optical fiber under different wave length:
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. a kind of fibre loss characteristic test test macro, which is characterized in that the fibre loss characteristic test test macro packet
It includes:
Light source module, the semi-conductor electricity optical device equipped with tetra- kinds of wavelength of 630nm, 860nm, 1310nm and 1550nm, has respective
Light-emitting window；630nm red-light source is provided by feux rouges pen；The driving circuit and XOR logic light of 1550nm long wavelength semiconductor laser
Fine linear measure longimetry module shares；
Fiber channel module, length are two disk of multimode fibre of 200m and 1200m, secondary fixed, band FC plug and connector；
Optical fiber length measuring module has modulating signal source, modulated signal electric light/photoelectric conversion and regenerative circuit, XOR logic
Fiber lengths sensor and double-bevel analog to digital conversion circuit；
Optical power indicating module makees photoelectric probe, indicating range 0- with SPD photodiode for 630nm and 860nm wavelength
200 microwatts；For 1310nm and 1550nm wavelength, make photoelectric probe, indicating range 0-2000 microwatt with PIN photodiode.
2. fibre loss characteristic test test macro as described in claim 1, which is characterized in that the optical fiber length measuring mould
It is 32 delicate, duty ratio 50% square-wave signals that block modulated signal, which is the period, is modulated, uses up to light source device luminous intensity
Optical signal is coupled to fiber channel one end by fine wire jumper and fiber active linker；Optical signal experience certain time is transferred to optical fiber
The channel other end, after carrying out photoelectric conversion and regeneration adjusting to optical signal with photodiode, obtaining a duty ratio is 50%
Regenerate electric signal；The regeneration electric signal of the reference electrical signal synchronous with transmitting terminal optical signal and receiving end is connected to XOR logic light
Two input terminals of fine linear transducer；The output of XOR circuit terminates 7107 double-bevel analog to digital conversion circuit V in+ feet；
7107 analog to digital conversion circuit V in- feet connect zero point and adjust potentiometer movable end, and 7107 analog to digital conversion circuit V ref+ feet connect calibration
Adjust potentiometer movable end.
3. a kind of fibre loss characteristic test test side based on fibre loss characteristic test test macro described in claim 1
Method, which is characterized in that the fibre loss characteristic test test method includes:
The first step connects measuring system, with the length for the two coiled optical fiber channels that the measurement of XOR logic optical fiber length measuring instrument provides；
Second step, the long optical fibers channel access measuring system for being L length；LD electric current is adjusted to 20mA, optical power is read and shows
Device number, and it is denoted as pL；It is L with length in the case where keeping the constant situation of LD electric currentOShort fiber channel replace long optical fibers channel connect
Enter；Optical power display number is read, and is denoted as pLo；
Third step accesses measuring system with the light source device of different wave length, repeats above operation；
4th step can calculate the optical fiber loss factor of four kinds of wavelength according to the above measurement data.
4. fibre loss characteristic test test method as claimed in claim 3, which is characterized in that the fibre loss characteristic is real
The principle of test method for testing is:
By definition, optical fiber loss factor；
α=10log (pin/pout)/L(dB/km)；
Wherein pinInput optical power, p for optical fiberoutOutput optical power, L for optical fiber are the length of optical fiber.
Method of substitution measures fibre loss, and the long optical fibers channel access measuring system for being first L length, wherein P0 is light source device
It is apart from tested optical fiber starting point that fiber optical power, the P1 out of LD tie jumper, which are tested optical fiber incident optical power, P2 that length is L,
It is that PIN photodetector part enters fine light function for go out fiber optical power, P (L) that the optical power at L0, P3 are tested optical fiber terminals
Rate；
Po/P (L)=(Po/P1) * (P1/P2) * (P2/P3) * { P3/P (L) }；
Log { Po/P (L) }=Log (Po/P1)+Log (P1/P2)+Log (P2/P3)+Log { P3/P (L) }；So；
αL=α1+αab+αbc+α2；
Wherein: αLFor the total losses of the measuring system；α1The junction loss of ring flange 1；αabFor AB sections of the loss of L long optical fibers；αbc
For BC sections of the loss of L long optical fibers；α2For the junction loss of ring flange；Wherein AB sections of loss is other than the transmission loss of guided modes
There are also the radiation mode loss of starting point；It then is L with length0Short fiber channel replace long optical fibers channel access measuring system,
In same test device, the optical power for being coupled to photoelectricity testing part by ring flange and optical patchcord is surveyed again
Amount, measurement result are denoted as P (L0)；When second of measurement, the total losses of measuring system are write as:
αL0=α1’+αab+α2'；
Wherein αL0The total losses of system when being measured for second；α1' be ring flange 1 junction loss；αabFor the loss of L0 long optical fibers；
α2' be ring flange 2 junction loss；If front and back measure twice in junction loss α1With α1’、α2With α2' difference and BC sections of light
Fine loss αbcIt is set up compared to very little, following relationship approximation:
αbc=αL-αL0；
The loss factor of tested optical fiber:
α=(αL-αL0)/(L-L0)
=10log [p (L)/p (Lo)]/(L-L0)(dB/km)。
5. fibre loss characteristic test test method as claimed in claim 3, which is characterized in that the fibre loss characteristic is real
XOR logic method optical fibre length measurement method in test method for testing are as follows:
With the period 32 is delicate, square wave electrical signal signal of duty ratio 50% makees modulated signal, the strong light of noise spectra of semiconductor lasers
Degree is modulated, and generates that a cycle 32 is delicate, square wave optical signal of duty ratio 50%；It is connected with optical patchcord with optical fibre
Optical signal is coupled to tested optical fiber one end from LD light-emitting window by device；Optical signal experience certain time is transferred to the tested optical fiber other end
Afterwards, after carrying out photoelectric conversion and regeneration adjusting to optical signal with PIN photodiode, obtaining a duty ratio is 50% regeneration electricity
Signal；Select an electric signal synchronous with optical signal as reference signal in modulated signal electro-optical conversion circuit；Reference
Regeneration electrical signal in signal output end and modulated signal electro-optical conversion circuit is connected to XOR logic fiber lengths sensing
Two input terminals of device；XOR circuit output end is connected to 7107 double-bevel analog-to-digital conversions and Digital Display Circuit through bleeder circuit
The end Vin+；The Vin- of 7107 double-bevel analog-to-digital conversions and Digital Display Circuit terminates zero point and adjusts potentiometer movable end, 7107 double-bevels
The Vref+ of analog-to-digital conversion and Digital Display Circuit termination calibration adjusts potentiometer movable end；Measure the behaviour of the fiber lengths of fiber channel
Be as step: when fiber channel length is zero, regenerated signal duty ratio is under 50% state, and adjusting zero point adjusting potentiometer makes
7107 double-bevel analog-to-digital conversions and the number of Digital Display Circuit are shown as 0000；Then zero point is kept to adjust the adjustment state of potentiometer
Constant, 200m long standard fiber incoming fiber optic length measuring system, regenerated signal duty ratio is to adjust calibration under 50% state
Adjusting potentiometer makes the number of 7107 double-bevel analog-to-digital conversions and Digital Display Circuit be shown as 0200；It completes zero point and adjusts and calibrate tune
After section, after the fiber channel incoming fiber optic length measuring system of unknown lengths, regenerated signal duty ratio is under 50% state
The number of the number display of 7107 double-bevel analog-to-digital conversions and Digital Display Circuit is exactly the length of tested optical fiber.
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