CN107328559A - A kind of loss of fibre-optical connection measurement apparatus and measuring method - Google Patents
A kind of loss of fibre-optical connection measurement apparatus and measuring method Download PDFInfo
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- CN107328559A CN107328559A CN201710690281.1A CN201710690281A CN107328559A CN 107328559 A CN107328559 A CN 107328559A CN 201710690281 A CN201710690281 A CN 201710690281A CN 107328559 A CN107328559 A CN 107328559A
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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
- G01M11/39—Testing of optical devices, constituted by fibre optics or optical waveguides in which light is projected from both sides of the fiber or waveguide end-face
Abstract
The invention discloses a kind of loss of fibre-optical connection measurement apparatus and measuring method, methods described includes loss of fibre-optical connection measurement apparatus, concretely comprised the following steps：（1）Tested optical fiber is clamped using fibre holder；（2）2x2 photoswitches are controlled to be in connection status 1, record detection optical signal power P0；（3）2x2 photoswitches are controlled to be in connection status 1, record detection optical signal power P2；（4）2x2 photoswitches are controlled to be in connection status 1, record detection optical signal power P3；（5）2x2 photoswitches are controlled to be in connection status 2, record detection optical signal power P1；（6）2x2 photoswitches are controlled to be in connection status 2, record detection optical signal power P4；（7）Control unit control 2x2 photoswitches are in connection status 2, record detection optical signal power P5；（8）Calculate under 1550nm windows, loss of fibre-optical connection value.This measuring method is simple to operate, practical, can save construction cost, improve production efficiency.
Description
Technical field
The present invention relates to optical fiber measurement field, more particularly to loss of fibre-optical connection e measurement technology, specifically a kind of optical fiber
Junction loss measurement apparatus and measuring method.
Background technology
In fiber cable laying construction, fused fiber splice is an essential link, in this link, to fused fiber splice
The loss control of point, directly influences the total losses index of whole section of optical fiber link.It is typically first to use light in current optical cable construction
The loss of optical fiber fusion welding point is controlled to splice loss, splice attenuation management function in the fine automatic welding of heat sealing machine；Next to that by OTDR remote
End is tested to control the loss of optical fiber fusion welding point；It is finally by OTDR to carry out two-way test to control at optical fiber link two ends
The loss of optical fiber fusion welding point processed.
There are some following drawbacks in optical cable construction measuring method above：
1. when carrying out automatic welding using optical fiber splicer, current most of optical fiber splicer all possesses to being entered
Capable fused fiber splice implements the function that loss is assessed, still, and this loss evaluation function is typically all to be docked by observing fibre core
The factor such as quality, the quality of core end surface carry out experience calculating, then draw the loss of optical fiber fusion welding point, therefore, pass through
Loss of the optical fiber splicer to optical fiber fusion welding point is assessed, obtained optical fiber fusion welding point loss value, simply a kind of estimated value, rather than
Measured value, in real work, optical fiber fusion welding point is lost optical fiber splicer assessment is simultaneously not accurate enough, under many circumstances, when
When optical fiber splicer provides optical fiber fusion welding point loss value for 0.00dB, measured value probably reaches 0.1dB, even more greatly, institute
By observing quality, the quality of core end surface that fibre core is docked, to show that the loss value of optical fiber fusion welding point can only conduct therefrom
A kind of approximate evaluation value, it is impossible to used as true measurement；
2. measuring optical fiber fusion welding point loss value using OTDR in optical cable construction, current most common method has：Backward
One way, forward direction one way, three kinds of method of testings of forward direction round trip, optical fiber fusion welding point loss value are measured using OTDR, benefit is to compare
When accurately, especially with two-way test, optical fiber link total losses can be not only measured, each fused fiber splice can also be tested out
The loss of point loss size and each section of optical fiber, it has not been convenient to which part is when measuring, it is necessary to which OTDR instruments are placed on into light
One or both ends on cable road, rather than in optical fiber fusion welding point working site.This means except being worked in optical fiber fusion welding point
Scene is needed beyond configuration work personnel, in addition it is also necessary to which configuration work personnel look after and operated at the one or both ends of lightguide cable link
OTDR instruments, particularly when cable link is overlength circuit, situation is even worse, it is necessary to circuit is carried out into areal survey, otherwise may be used
Because the measurement of OTDR instruments dynamic is not enough measurement can be caused to have no idea to carry out, in addition, carrying out optical fiber link using OTDR
During measurement, if only unidirectionally tested, due to the presence of false enhancement, measurement data is caused to be forbidden, so using
When OTDR carries out optical fiber link measurement, it is desirable to carry out two-way test, to ensure that the accuracy of parameter is lost in optical fiber link；
3. according to another investigation statisticses, the two-way value of splicing loss that about 20%-30% is had in optical cable project continues is conformed to
Ask and the exceeded situation generation of one-way value, it means that engineering staff might have 20%-30%'s when using unidirectional monitoring
The repetition that situation carries out mistake continues, it is of course also possible in the presence of another situation, if use unidirectional monitoring, in optical cable
Construction is without before completing, and optical fiber link has no through, due to the presence of false enhancement, causes to damage some optical fiber fusion welding points
Consumption test is inaccurate, such as obtained optical fiber fusion welding point loss is unidirectionally tested using OTDR progress and is less than 0.05dB, but light in future
When carrying out two-way test after the completion of cable construction, it may find that optical fiber fusion welding point loss is more than 0.2dB at this, once occur this
Situation, to ensure the loss objective of whole piece optical fiber link, have to do over again, the optical fiber that fusion point is lost into exceeded place disconnects again, weight
New welding.
In view of the foregoing it is apparent that, the current ongoing optical fiber fusion welding point loss measurement of optical cable construction, in operating efficiency side
Face, it is impossible to make us pleasing oneself.
The content of the invention
The purpose of the present invention is in view of the shortcomings of the prior art, and to provide a kind of loss of fibre-optical connection measurement apparatus and measurement
Method.This device can accurately measure the loss of optical fiber welding joint, and easy to use, operability is good, practical, cost
It is low.This measuring method is simple to operate, practical, can save construction cost, improve production efficiency.
Realizing the technical scheme of the object of the invention is：
A kind of loss of fibre-optical connection measurement apparatus, including fibre holder a, fibre holder b, pump light signals source, spy
Light signal source, 2x2 photoswitches, optical directional coupler, optical filter and optical signal detector, the one of the fibre holder a
End connection tested optical fiber 1, other end connection 2x2 photoswitches；One end connection tested optical fiber 2 of the fibre holder b, the other end
Connect 2x2 photoswitches；Two other ports of the 2x2 photoswitches connects detection optical signal source and optical directional coupler respectively
Public port；One in remaining two ports of the optical directional coupler is connected with pump light signals source, and another passes through light
Wave filter connects optical signal detector.
The pump light signals source is used for the light pulse signal for producing 1550nm windows, and light pulse signal width range is
1n-100ns, peak optical powers scope is+30dBm-+60dBm.
The detection optical signal source is used for the light pulse signal for producing 1625nm windows, and light pulse signal width range is
1ns-100ns, peak optical powers scope is -10dBm-+20dBm.
Using the measuring method of above-mentioned loss of fibre-optical connection measurement apparatus, comprise the following steps：
(1) using fibre holder a and fibre holder b respectively in the He of sandwich tested optical fiber 1 of fiber connection points
Tested optical fiber 2, fiber connection points to optical fiber bite a and to optical fiber bite b fiber lengths in the range of 0.5m-10m；
(2) control 2x2 photoswitches are in connection status 1, control pumping optical signal source and detection optical signal source, send detection
Light pulse signal, pumping light pulse signal is not sent out, and the detection optical signal power that optical receiver measurement is received is recorded as P0；
(3) control 2x2 photoswitches are in connection status 1, pump light signals source output pumping light pulse signal, detection light letter
Number source output detecting optical pulses signal, allows the two signals between the optical fiber bite of fiber connection points to fibre holder a
Tested optical fiber 1 in meet, and the two signals, when meeting, pumping light pulse signal have passed through fiber connection points, and detect
Light pulse signal not yet passes through fiber connection points, and the detection optical signal luminous power that photo-detector measurement is received is recorded as P2；
(4) control 2x2 photoswitches are in connection status 1, pump light signals source output pumping light pulse signal, detection light letter
Number source output detecting optical pulses signal, allows the two signals between the optical fiber bite of fiber connection points to fibre holder b
Tested optical fiber 2 in meet, and the two signals are when meeting, and detecting optical pulses signal have passed through fiber connection points, and pumping
Light pulse signal not yet passes through fiber connection points, and the detection optical signal luminous power that photo-detector measurement is received is recorded as P3；
(5) control 2x2 photoswitches are in connection status 2, control pumping optical signal source and detection optical signal source, send detection
Light pulse signal, pumping light pulse signal is not sent out, and the detection optical signal power that optical receiver measurement is received is recorded as P1；
(6) control 2x2 photoswitches are in connection status 2, pump light signals source output pumping light pulse signal, detection light letter
Number source output detecting optical pulses signal, allows the two signals between the optical fiber bite of fiber connection points to fibre holder b
Tested optical fiber 2 in meet, and the two signals, when meeting, pumping light pulse signal have passed through fiber connection points, and detect
Light pulse signal not yet passes through fiber connection points, and the detection optical signal luminous power that photo-detector measurement is received is recorded as P4；
(7) control unit control 2x2 photoswitches are in connection status 2, and pump light signals source exports pumping light pulse signal,
Optical signal source output detecting optical pulses signal is detected, the two signals are allowed in the fibre clip of fiber connection points to fibre holder a
Met in tested optical fiber 1 between holding a little, detecting optical pulses signal have passed through fiber connection points, and pumping light pulse signal is not yet
By fiber connection points, the detection optical signal luminous power that photo-detector measurement is received is recorded as P5；
(8) calculate under 1550nm windows, loss of fibre-optical connection value A is：
A=5*log (((P3-P0)*(P5-P1))/((P2-P0)*(P4-P1))。
By two fibre holders, in the left and right sides of fiber connection points, respectively by pumping light pulse signal and detection
Light pulse signal is coupled in tested optical fiber or detecting optical pulses signal is taken out from tested optical fiber, and fibre holder is to pass through
The mode of bending tested optical fiber is optically coupled, that is, tested optical fiber is bent to several millimeters of curvature so that pump light arteries and veins
Rushing signal or detecting optical pulses signal can be coupled in tested optical fiber, or the taking-up detecting optical pulses letter from tested optical fiber
Number.
By the state for changing 2x2 photoswitches, thus it is possible to vary pumping light pulse signal and detecting optical pulses signal enter quilt
The fine direction of light-metering, i.e.,：Pumping light pulse signal enters tested optical fiber from the left side of fiber connection points, detecting optical pulses signal from
The right side of fiber connection points enters tested optical fiber；Either pumping light pulse signal enters by light-metering from the right side of fiber connection points
Fibre, detecting optical pulses signal enters tested optical fiber from the left side of fiber connection points.
Optical directional coupler is used to separate pumping light pulse signal and detecting optical pulses signal, and pumping light pulse signal passes through
Optical directional coupler enters 2x2 photoswitches, subsequently into light clamper, then is coupled into tested optical fiber；Detect light arteries and veins
Signal is rushed through light clamper, couples and takes out from tested optical fiber, into optical directional coupler, be then passed to optical filter, then
Into photo-detector.
Pumping optical signal source and detection optical signal source are controlled, pumping light pulse signal and detecting optical pulses signal is allowed in the time
Order has certain correlation, by changing the position of the two light pulse signals in time so that pumping light pulse signal
It can be arranged in tested optical fiber and meet with detecting optical pulses signal, can also be arranged not meeting in tested optical fiber；When
When pumping light pulse signal and detecting optical pulses signal meet in tested optical fiber, can select arrange two signals meet part
It is the fibre holder a sides in tested optical fiber tie point, i.e.,：Pumping light pulse signal and detecting optical pulses signal are by light-metering
When being met in fibre, pumping light pulse signal have passed through fiber connection points, and detecting optical pulses signal not yet passes through fiber connection points,
Either the fibre holder b sides in tested optical fiber tie point are：Pumping light pulse signal and detecting optical pulses signal are in quilt
When being met during light-metering is fine, detecting optical pulses signal have passed through fiber connection points, and pumping light pulse signal not yet connects by optical fiber
Contact.
If pumping light pulse signal and detecting optical pulses signal meet in tested optical fiber, interaction-drawing can be produced
Graceful effect, detecting optical pulses signal is amplified by pumping light pulse signal；If pumping light pulse signal and detecting optical pulses signal
Do not met in tested optical fiber, then detecting optical pulses signal is not amplified by pumping light pulse signal, and the two light pulses
Signal is the fibre holder a sides in tested optical fiber tie point in place of meeting, and is in the optical fiber of tested optical fiber tie point
Clamper b sides, it will so that the amount that detecting optical pulses signal is amplified by pumping light pulse signal is different, contain here
The loss information of tested optical fiber tie point, by arranging the pumping light pulse signal and detecting optical pulses of different time position to believe
Number, and detecting optical pulses signal is taken out on the right side of tested optical fiber tie point, it is measured, tested optical fiber company is thus obtained
The loss of fibre-optical connection value of contact.
This device can accurately measure the loss of optical fiber welding joint, and easy to use, operability is good, practical, into
This is low.This measuring method is simple to operate, practical, can save construction cost, improve production efficiency.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment；
Fig. 2 is during 2x2 optical switch status 1, pumping light pulse signal and detecting optical pulses signal are by light-metering in embodiment
Meet schematic diagram on the left of fine tie point；
Fig. 3 is during 2x2 optical switch status 1, pumping light pulse signal and detecting optical pulses signal are by light-metering in embodiment
Meet schematic diagram on the right side of fine tie point；
Fig. 4 is during 2x2 optical switch status 2, pumping light pulse signal and detecting optical pulses signal are by light-metering in embodiment
Meet schematic diagram on the side right side of fine tie point；
Fig. 5 is during 2x2 optical switch status 2, pumping light pulse signal and detecting optical pulses signal are by light-metering in embodiment
Meet schematic diagram on the left of fine tie point.
Embodiment
Present invention is further elaborated with reference to the accompanying drawings and examples, but is not limitation of the invention.
Embodiment：
Reference picture 1, a kind of loss of fibre-optical connection measurement apparatus, including fibre holder a, fibre holder b, pump light letter
Number source, detection optical signal source, 2x2 photoswitches, optical directional coupler, optical filter and optical signal detector, the optical fiber clamping
Device a one end connection tested optical fiber 1, other end connection 2x2 photoswitches；One end connection tested optical fiber of the fibre holder b
2, other end connection 2x2 photoswitches；Two other port of the 2x2 photoswitches connects detection optical signal source and light direction respectively
The public port of coupler；One in remaining two ports of the optical directional coupler is connected with pump light signals source, another
It is individual that optical signal detector is connected by optical filter.
The pump light signals source is used for the light pulse signal for producing 1550nm windows, and light pulse signal width range is
1n-100ns, peak optical powers scope is+30dBm-+60dBm.
The detection optical signal source is used for the light pulse signal for producing 1625nm windows, and light pulse signal width range is
1ns-100ns, peak optical powers scope is -10dBm-+20dBm.
Reference picture 2, Fig. 3, Fig. 4, Fig. 5, using the measuring method of above-mentioned loss of fibre-optical connection measurement apparatus, including following step
Suddenly：
(1) using fibre holder a and fibre holder b respectively in the He of sandwich tested optical fiber 1 of fiber connection points
Tested optical fiber 2, fiber connection points to optical fiber bite a and to optical fiber bite b fiber lengths in the range of 0.5m-10m；
(2) control 2x2 photoswitches are in connection status 1, control pumping optical signal source and detection optical signal source, send detection
Light pulse signal, pumping light pulse signal is not sent out, and the detection optical signal power that optical receiver measurement is received is recorded as P0；
(3) control 2x2 photoswitches are in connection status 1, pump light signals source output pumping light pulse signal, detection light letter
Number source output detecting optical pulses signal, allows the two signals between the optical fiber bite of fiber connection points to fibre holder a
Tested optical fiber 1 in meet, and the two signals, when meeting, pumping light pulse signal have passed through fiber connection points, and detect
Light pulse signal not yet passes through fiber connection points, and the detection optical signal luminous power that photo-detector measurement is received is recorded as P2；
(4) control 2x2 photoswitches are in connection status 1, pump light signals source output pumping light pulse signal, detection light letter
Number source output detecting optical pulses signal, allow the two signals fiber connection points to arrive fibre holder b optical fiber bite it
Between tested optical fiber 2 in meet, and the two signals are when meeting, and detecting optical pulses signal have passed through fiber connection points, and pump
Pu light pulse signal not yet passes through fiber connection points, and the detection optical signal luminous power that photo-detector measurement is received is recorded as P3；
(5) control 2x2 photoswitches are in connection status 2, control pumping optical signal source and detection optical signal source, send detection
Light pulse signal, pumping light pulse signal is not sent out, and the detection optical signal power that optical receiver measurement is received is recorded as P1；
(6) control 2x2 photoswitches are in connection status 2, pump light signals source output pumping light pulse signal, detection light letter
Number source output detecting optical pulses signal, allows the two signals between the optical fiber bite of fiber connection points to fibre holder b
Tested optical fiber 2 in meet, and the two signals, when meeting, pumping light pulse signal have passed through fiber connection points, and detect
Light pulse signal not yet passes through fiber connection points, and the detection optical signal luminous power that photo-detector measurement is received is recorded as P4；
(7) control unit control 2x2 photoswitches are in connection status 2, and pump light signals source exports pumping light pulse signal,
Optical signal source output detecting optical pulses signal is detected, allows the two signals in fiber connection points to the optical fiber to fibre holder a
Met in tested optical fiber 1 between bite, detecting optical pulses signal have passed through fiber connection points, and pumping light pulse signal is still
Without fiber connection points, the detection optical signal luminous power that photo-detector measurement is received is recorded as P5；
(8) calculate under 1550nm windows, loss of fibre-optical connection value A is：
A=5*log (((P3-P0)*(P5-P1))/((P2-P0)*(P4-P1))。
Detect optical signal and pass through 2x2 photoswitches, the bare fibre 1 of tested optical fiber is then coupled to by fibre holder a
In, after tested optical fiber tie point, the bare fibre 2 of tested optical fiber, taking-up is coupled by fibre holder b, then by 2x2
Photoswitch, optical directional coupler, optical filter, are sent to optical signal detector and carry out measuring light power.According to selected by 2x2 photoswitches
The state selected, detection optical signal can also walk another route, and detection optical signal passes through 2x2 photoswitches, then passes through optical fiber
Clamper b is coupled in the bare fibre 2 of tested optical fiber, after tested optical fiber tie point, the bare fibre 1 of tested optical fiber, is led to
Cross fibre holder a and be coupled taking-up, then by 2x2 photoswitches, optical directional coupler, optical filter, be sent to optical signal detection
Device carries out measuring light power.
Pump light signals by optical directional coupler enter 2x2 photoswitches, then by fibre holder b be coupled to by
In the fine bare fibre 2 of light-metering, in the bare fibre 1 that tested optical fiber is entered after tested optical fiber tie point.According to 2x2 photoswitches
Selected state, pump light signals can also walk another route, and pump light signals enter 2x2 by optical directional coupler
Photoswitch, is then coupled in the bare fibre 1 of tested optical fiber by fibre holder a, laggard by tested optical fiber tie point
Enter into the bare fibre 2 of tested optical fiber.
By two fibre holders, pumping light pulse signal and detecting optical pulses signal are connected from tested optical fiber respectively
The left and right sides of point is coupled in tested optical fiber, or the taking-up detecting optical pulses signal from tested optical fiber.Fibre holder
It is to be optically coupled by way of bending tested optical fiber, that is, tested optical fiber is bent to several millimeters of curvature so that pump
Pu light pulse signal or detecting optical pulses signal can be coupled in tested optical fiber, or the taking-up detection light from tested optical fiber
Pulse signal.The coupling loss scope of fibre holder is in 10dB-25dB.
Pass through 2x2 photoswitches, thus it is possible to vary pumping light pulse signal and detecting optical pulses signal enter the side of tested optical fiber
To that is,：Pumping light pulse signal enters from the left side bare fibre 1 of tested optical fiber tie point, and detecting optical pulses signal is from by light-metering
The right side bare fibre 2 of fine tie point enters；The right bare fibre 2 in side of either pumping light pulse signal from tested optical fiber tie point enters
Enter, detecting optical pulses signal enters from the left side bare fibre 1 of tested optical fiber tie point.
Optical directional coupler is used to separate or coupling pumping light pulse signal and detecting optical pulses signal, pumping light pulse letter
Number by after optical directional coupler enter 2x2 photoswitches.Detecting optical pulses signal takes through fibre holder from tested optical fiber
Go out, into 2x2 photoswitches, optical directional coupler, be then passed to optical filter, enter back into photo-detector.
Optical filter is used for filtering pump light signal, retains detection optical signal.
Measure start when, first by fibre holder respectively in the sandwich tested optical fiber of fiber connection points, such as
Shown in Fig. 1.The length of the bare fibre 1 of tested optical fiber and the bare fibre 2 of tested optical fiber is in 0.5m~10m, if length longer one
A bit, although be conducive to measurement, but require that optical fiber reserved during optical fiber connection is longer, it can be made troubles to disk fibre work.
Control unit controls pumping optical signal source and detection optical signal source, allows pumping light pulse signal and detecting optical pulses to believe
Number there is certain correlation in chronological order, by the time location for changing the two light pulse signals so that pumping light pulse
Signal and detecting optical pulses signal, which can be arranged in tested optical fiber, to meet, and can also be arranged not meeting in tested optical fiber
(in this case, the output in pump light signals source can also be closed).
As shown in Fig. 2 the connection status 1 of correspondence 2x2 photoswitches, pumping light pulse signal is on the right side of tested optical fiber tie point
(i.e.：Fibre holder b) enters the bare fibre 2 of tested optical fiber, detecting optical pulses signal on the left of the tested optical fiber tie point (i.e.：
Fibre holder a) enters the bare fibre 1 of tested optical fiber, when pumping light pulse signal and detecting optical pulses signal are in tested optical fiber
In when meeting, it is the left side bare fibre 1 in tested optical fiber tie point to arrange the two signals part of meeting, i.e.,：Pump light arteries and veins
When rushing signal and detecting optical pulses signal and being met at the bare fibre 1 in tested optical fiber, pumping light pulse signal have passed through optical fiber
Tie point, and detecting optical pulses signal not yet passes through fiber connection points.
As shown in figure 3, the connection status 1 of correspondence 2x2 photoswitches, pumping light pulse signal is on the right side of tested optical fiber tie point
(i.e.：Clamper b) enters the bare fibre 2 of tested optical fiber, detecting optical pulses signal on the left of the tested optical fiber tie point (i.e.：Clamping
Device a) enters the bare fibre 1 of tested optical fiber, and it is the naked light in right side in tested optical fiber tie point in place of meeting to arrange two signals
Fibre 2, i.e.,：When the bare fibre 2 of pumping light pulse signal and detecting optical pulses signal in tested optical fiber meets, detecting optical pulses letter
Fiber connection points number are have passed through, and pumping light pulse signal not yet passes through fiber connection points.
As shown in figure 4, the connection status 2 of correspondence 2x2 photoswitches, pumping light pulse signal is on the left of tested optical fiber tie point
(i.e.：Clamper a) enters the bare fibre 1 of tested optical fiber, detecting optical pulses signal on the right side of the tested optical fiber tie point (i.e.：Clamping
Device b) enters the bare fibre 2 of tested optical fiber, and it is the naked light in right side in tested optical fiber tie point in place of meeting to arrange two signals
Fibre 2, i.e.,：When the bare fibre 2 of pumping light pulse signal and detecting optical pulses signal in tested optical fiber meets, pumping light pulse letter
Fiber connection points number are have passed through, and detecting optical pulses signal not yet passes through fiber connection points.
As shown in figure 5, the connection status 2 of correspondence 2x2 photoswitches, pumping light pulse signal is on the left of tested optical fiber tie point
(i.e.：Clamper a) enters the bare fibre 1 of tested optical fiber, detecting optical pulses signal on the right side of the tested optical fiber tie point (i.e.：Clamping
Device b) enters the bare fibre 2 of tested optical fiber, and it is the naked light in left side in tested optical fiber tie point in place of meeting to arrange two signals
Fibre 1, i.e.,：When pumping light pulse signal and detecting optical pulses signal meet in tested optical fiber, detecting optical pulses signal have passed through
Fiber connection points, and pumping light pulse signal not yet passes through fiber connection points.
Control unit controls the connection status of pumping optical signal source and detection optical signal source and 2x2 photoswitches, following
The luminous power received in the state of difference by photo-detector measurement.
When 2x2 photoswitches are in connection status 1, the output in pump light signals source, detection optical signal source output detection are closed
Light pulse signal, the luminous power P that photo-detector measurement is received0。
When 2x2 photoswitches are in connection status 1, output pumping light pulse signal in pump light signals source detects optical signal source
Detecting optical pulses signal is exported, the time location relation of two signals make it that pumping light pulse signal and detecting optical pulses signal are full
State shown in sufficient Fig. 2, i.e.,：When pumping light pulse signal and detecting optical pulses signal meet at the bare fibre 1 in tested optical fiber,
Pumping light pulse signal have passed through fiber connection points, and detecting optical pulses signal not yet passes through fiber connection points.Photo-detector is surveyed
Measure the luminous power P received2。
When 2x2 photoswitches are in connection status 1, output pumping light pulse signal in pump light signals source detects optical signal source
Detecting optical pulses signal is exported, the time location relation of two signals make it that pumping light pulse signal and detecting optical pulses signal are full
State shown in sufficient Fig. 3, i.e.,：When pumping light pulse signal and detecting optical pulses signal meet at the bare fibre 2 in tested optical fiber,
Detecting optical pulses signal have passed through fiber connection points, and pumping light pulse signal not yet passes through fiber connection points.Photo-detector is surveyed
Measure the luminous power P received3。
When 2x2 photoswitches are in connection status 2, the output in pump light signals source, detection optical signal source output detection are closed
Light pulse signal, the luminous power P that photo-detector measurement is received1。
When 2x2 photoswitches are in connection status 2, output pumping light pulse signal in pump light signals source detects optical signal source
Detecting optical pulses signal is exported, the time location relation of two signals make it that pumping light pulse signal and detecting optical pulses signal are full
State shown in sufficient Fig. 4, i.e.,：When pumping light pulse signal and detecting optical pulses signal meet at the bare fibre 2 in tested optical fiber,
Pumping light pulse signal have passed through fiber connection points, and detecting optical pulses signal not yet passes through fiber connection points.Photo-detector is surveyed
Measure the luminous power P received4。
When 2x2 photoswitches are in connection status 2, output pumping light pulse signal in pump light signals source detects optical signal source
Detecting optical pulses signal is exported, the time location relation of two signals make it that pumping light pulse signal and detecting optical pulses signal are full
State shown in sufficient Fig. 5, i.e.,：When pumping light pulse signal and detecting optical pulses signal meet at the bare fibre 1 in tested optical fiber,
Detecting optical pulses signal have passed through fiber connection points, and pumping light pulse signal not yet passes through fiber connection points.Photo-detector is surveyed
Measure the luminous power P received5。
2x2 photoswitches are under connection status 1, pump light signals direction from clamper b to clamper a, in 1550nm windows
Under mouthful, loss of fibre-optical connection value Ab-a=10*log ((P3-P0)/(P2-P0))。
2x2 photoswitches are under connection status 2, pump light signals direction from clamper a to clamper b, in 1550nm windows
Under mouthful, loss of fibre-optical connection value Aa-b=10*log ((P5-P1)/(P4-P1))。
Under 1550nm windows, loss of fibre-optical connection value A：
A=(Ab-a+Aa-b)/2=5*log (((P3-P0)*(P5-P1))/((P2-P0)*(P4-P1))。
Claims (4)
1. a kind of loss of fibre-optical connection measurement apparatus, it is characterized in that, including fibre holder a, fibre holder b, pump light letter
Number source, detection optical signal source, 2x2 photoswitches, optical directional coupler, optical filter and optical signal detector, the optical fiber clamping
Device a one end connection tested optical fiber 1, other end connection 2x2 photoswitches；One end connection tested optical fiber of the fibre holder b
2, other end connection 2x2 photoswitches；Two other port of the 2x2 photoswitches connects detection optical signal source and light direction respectively
The public port of coupler；One in remaining two ports of the optical directional coupler is connected with pump light signals source, another
It is individual that optical signal detector is connected by optical filter.
2. loss of fibre-optical connection measurement apparatus according to claim 1, it is characterized in that, the pump light signals source is used to produce
The light pulse signal of raw 1550nm windows, light pulse signal width range is 1n-100ns, and peak optical powers scope is+30dBm-
+60dBm。
3. loss of fibre-optical connection measurement apparatus according to claim 1, it is characterized in that, the detection optical signal source is used to produce
The light pulse signal of raw 1625nm windows, light pulse signal width range is 1ns-100ns, peak optical powers scope for-
10dBm-+20dBm。
4. a kind of measuring method of the loss of fibre-optical connection measurement apparatus described in use claim any one of 1-3, it is characterized in that,
Comprise the following steps：
(1) using fibre holder a and fibre holder b respectively in the sandwich tested optical fiber 1 of fiber connection points and tested
Optical fiber 2, fiber connection points to optical fiber bite a and to optical fiber bite b fiber lengths in the range of 0.5m-10m；
(2) control 2x2 photoswitches are in connection status 1, control pumping optical signal source and detection optical signal source, send detection light arteries and veins
Signal is rushed, pumping light pulse signal is not sent out, the detection optical signal power that optical receiver measurement is received is recorded as P0；
(3) control 2x2 photoswitches are in connection status 1, and output pumping light pulse signal in pump light signals source detects optical signal source
Detecting optical pulses signal is exported, quilt of the two signals between the optical fiber bite of fiber connection points to fibre holder a is allowed
Met in light-metering fibre 1, and the two signals, when meeting, pumping light pulse signal have passed through fiber connection points, and detect light arteries and veins
Rush signal and not yet pass through fiber connection points, the detection optical signal luminous power that photo-detector measurement is received is recorded as P2；
(4) control 2x2 photoswitches are in connection status 1, and output pumping light pulse signal in pump light signals source detects optical signal source
Detecting optical pulses signal is exported, quilt of the two signals between the optical fiber bite of fiber connection points to fibre holder b is allowed
Met in light-metering fibre 2, and the two signals are when meeting, detecting optical pulses signal have passed through fiber connection points, and pump light arteries and veins
Rush signal and not yet pass through fiber connection points, the detection optical signal luminous power that photo-detector measurement is received is recorded as P3；
(5) control 2x2 photoswitches are in connection status 2, control pumping optical signal source and detection optical signal source, send detection light arteries and veins
Signal is rushed, pumping light pulse signal is not sent out, the detection optical signal power that optical receiver measurement is received is recorded as P1；
(6) control 2x2 photoswitches are in connection status 2, and output pumping light pulse signal in pump light signals source detects optical signal source
Detecting optical pulses signal is exported, quilt of the two signals between the optical fiber bite of fiber connection points to fibre holder b is allowed
Met in light-metering fibre 2, and the two signals, when meeting, pumping light pulse signal have passed through fiber connection points, and detect light arteries and veins
Rush signal and not yet pass through fiber connection points, the detection optical signal luminous power that photo-detector measurement is received is recorded as P4；
(7) control unit control 2x2 photoswitches are in connection status 2, pump light signals source output pumping light pulse signal, detection
Optical signal source exports detecting optical pulses signal, allows the two signals in the optical fiber bite of fiber connection points to fibre holder a
Between tested optical fiber 1 in meet, detecting optical pulses signal have passed through fiber connection points, and pumping light pulse signal not yet passes through
Fiber connection points, the detection optical signal luminous power that photo-detector measurement is received is recorded as P5；
(8) calculate under 1550nm windows, loss of fibre-optical connection value A is：
A=5*log (((P3-P0)*(P5-P1))/((P2-P0)*(P4-P1))。
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