CN107328559B - Optical fiber connection loss measuring device and measuring method - Google Patents
Optical fiber connection loss measuring device and measuring method Download PDFInfo
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- CN107328559B CN107328559B CN201710690281.1A CN201710690281A CN107328559B CN 107328559 B CN107328559 B CN 107328559B CN 201710690281 A CN201710690281 A CN 201710690281A CN 107328559 B CN107328559 B CN 107328559B
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Abstract
The invention discloses an optical fiber connection loss measuring device and a measuring method, wherein the method comprises the optical fiber connection loss measuring device and comprises the following specific steps: (1) clamping a measured optical fiber by using a fiber holder; (2) Controlling the 2x2 optical switch to be in a connection state 1, and recording the power P of the detection optical signal 0 (ii) a (3) Controlling the 2x2 optical switch to be in a connection state 1, and recording the power P of the detection optical signal 2 (ii) a (4) Controlling the 2x2 optical switch to be in a connection state 1, and recording the power P of the detection optical signal 3 (ii) a (5) Controlling the 2x2 optical switch to be in a connection state 2, and recording the power P of the detection optical signal 1 (ii) a (6) Controlling the 2x2 optical switch to be in a connection state 2, and recording the power P of the detection optical signal 4 (ii) a (7) The control unit controls the 2x2 optical switch to be in a connection state 2 and records the power P of the detection optical signal 5 (ii) a And (8) calculating the value of the connection loss of the optical fiber under a 1550nm window. The measuring method is simple to operate, high in practicability, capable of saving construction cost and improving production efficiency.
Description
Technical Field
The invention relates to the field of optical fiber measurement, in particular to an optical fiber connection loss measurement technology, and specifically relates to an optical fiber connection loss measurement device and a measurement method.
Background
In the construction of laying optical cables, optical fiber fusion is an essential link, and in the link, the loss control of an optical fiber fusion point directly influences the total loss index of the whole optical fiber link. In the current optical cable construction, the loss of an optical fiber fusion point is controlled by adopting a fusion loss management function in the automatic fusion of an optical fiber fusion splicer; secondly, testing at a far end through an OTDR to control the loss of the optical fiber fusion point; and finally, performing bidirectional test on two ends of the optical fiber link through OTDR to control the loss of the optical fiber fusion point.
The above optical cable construction measurement method has the following disadvantages:
1. when an optical fiber fusion splicer is used for automatic fusion splicing, most of the existing optical fiber fusion splicers have the function of performing loss evaluation on optical fiber fusion splicing, but the loss evaluation function is generally that factors such as the quality of fiber core butt joint, the quality of fiber core end face and the like are observed to perform empirical calculation, and then the loss of an optical fiber fusion splicing point is obtained, so that the loss value of the optical fiber fusion splicing point obtained by the loss evaluation of the optical fiber fusion splicer on the optical fiber fusion splicing point is only an estimated value and not a measured value, and in actual work, the loss evaluation of the optical fiber fusion splicing point by the optical fiber fusion splicer is not accurate enough, and in many cases, when the loss value of the optical fiber fusion splicing point given by the optical fiber fusion splicer is 0.00dB, the actual measured value is probably 0.1dB or even larger, so that the loss value of the optical fiber fusion splicing point obtained by observing the quality of the fiber core butt joint and the quality of the fiber core end face can only be used as an approximate evaluation value and cannot be used as a real measured value;
2. in the construction of optical cables, OTDR is used to measure the loss value of the fusion point of optical fibers, and the most common methods at present are: the method for testing the fusion point loss value of the optical fiber by using the OTDR has the advantages of being accurate, particularly being capable of measuring the total loss of an optical fiber link and the loss of each optical fiber fusion point and the loss of each section of optical fiber when a bidirectional test is adopted, and is inconvenient in that an OTDR instrument needs to be placed at one end or two ends of an optical cable line instead of a working site of the fusion point of the optical fiber when the measurement is carried out. This means that in addition to the need of configuring the operator at the optical fiber fusion point working site, the operator needs to be configured at one end or both ends of the optical cable line to look after and operate the OTDR instrument, especially when the optical cable link is an ultra-long line, the situation is worse, the line needs to be measured in segments, otherwise, the measurement may not be performed by any method due to insufficient measurement dynamics of the OTDR instrument, in addition, when the optical fiber link measurement is performed by using the OTDR, if only a unidirectional test is performed, the measurement data is inaccurate due to the existence of a false gain phenomenon, so when the optical fiber link measurement is performed by using the OTDR, a bidirectional test is required to be performed to ensure the accuracy of the loss parameter of the optical fiber link;
3. according to investigation statistics, about 20% -30% of joint loss bidirectional values meet requirements and unidirectional values exceed the standards in optical cable engineering connection, which means that an engineer may perform wrong repeated connection in 20% -30% of cases when unidirectional monitoring is adopted, and certainly, another case may exist, if unidirectional monitoring is adopted, an optical fiber link is not communicated before optical cable construction is not completed, loss testing on some optical fiber fusion points is not accurate due to the existence of a false gain phenomenon, for example, loss of the optical fiber fusion points obtained by using an OTDR to perform unidirectional testing is less than 0.05dB, but when bidirectional testing is performed after optical cable construction is completed in the future, loss of the optical fiber fusion points at the position may be found to be more than 0.2dB, and once the situation occurs, in order to ensure loss indexes of the whole optical fiber link, rework is needed, optical fibers at the fusion point loss exceeding the standards are disconnected again and are re-fusion-spliced.
In summary, it can be seen that the measurement of the loss of the fusion point of the optical fiber in the current optical cable construction process is not satisfactory in terms of working efficiency.
Disclosure of Invention
The present invention is directed to provide an optical fiber connection loss measuring device and a measuring method thereof. The device can accurately measure the loss of the optical fiber fusion splice, and has the advantages of convenient use, good operability, strong practicability and low cost. The measuring method is simple to operate, high in practicability, capable of saving construction cost and improving production efficiency.
The technical scheme for realizing the purpose of the invention is as follows:
an optical fiber connection loss measuring device comprises an optical fiber holder a, an optical fiber holder b, a pumping light signal source, a detection light signal source, a 2x2 optical switch, an optical directional coupler, an optical filter and an optical signal detector, wherein one end of the optical fiber holder a is connected with a first optical fiber to be detected, and the other end of the optical fiber holder a is connected with the 2x2 optical switch; one end of the optical fiber holder b is connected with a second tested optical fiber, and the other end of the optical fiber holder b is connected with a 2x2 optical switch; the other two ports of the 2x2 optical switch are respectively connected with a detection optical signal source and a public port of the optical directional coupler; one of the rest two ports of the optical directional coupler is connected with a pump optical signal source, and the other port of the optical directional coupler is connected with an optical signal detector through an optical filter.
The pump light signal source is used for generating an optical pulse signal with a 1550nm window, the width range of the optical pulse signal is 1n-100ns, and the range of peak optical power is +30dBm- +60dBm.
The detection light signal source is used for generating a light pulse signal with a window of 1625nm, the width range of the light pulse signal is 1ns-100ns, and the range of peak light power is-10 dBm- +20dBm.
The measuring method using the optical fiber connection loss measuring device comprises the following steps:
(1) Respectively clamping a first tested optical fiber and a second tested optical fiber at two sides of an optical fiber connection point by using an optical fiber holder a and an optical fiber holder b, wherein the lengths of the optical fibers from the optical fiber connection point to the optical fiber holding point a and the optical fiber holding point b are both in the range of 0.5m-10 m;
(2) Controlling the 2x2 optical switch to be in a first connection state, controlling the pump light signal source and the detection light signal source, emitting a detection light pulse signal, not emitting the pump light pulse signal, measuring the power of the received detection light signal by the optical receiver, and recording the power as P 0 ；
(3) Controlling a 2x2 optical switch to be in a first connection state, outputting a pump light pulse signal by a pump light signal source, outputting a detection light pulse signal by a detection light signal source, enabling the two signals to meet in a first detected optical fiber between an optical fiber connection point and an optical fiber clamping point of an optical fiber clamp holder a, and when the two signals meet, the pump light pulse signal passes through the optical fiber connection point, the detection light pulse signal does not pass through the optical fiber connection point yet, and recording the optical power of the received detection light signal into P by an optical detector through measuring the optical power of the received detection light signal 2 ；
(4) Controlling a 2x2 optical switch to be in a first connection state, outputting a pump light pulse signal by a pump light signal source, outputting a detection light pulse signal by a detection light signal source, enabling the two signals to meet in a second detected optical fiber between an optical fiber connection point and an optical fiber clamping point of an optical fiber clamp b, and when the two signals meet, enabling the detection light pulse signal to pass through the optical fiber connection point, and enabling the pump light pulse signal not to pass through the optical fiber connection point yet, wherein the optical detector is used for detecting the pump light pulse signalMeasuring the optical power of the received probe optical signal and recording as P 3 ；
(5) Controlling the 2x2 optical switch to be in a second connection state, controlling the pump light signal source and the detection light signal source, emitting a detection light pulse signal, not emitting the pump light pulse signal, measuring the power of the received detection light signal by the optical receiver, and recording the power as P 1 ；
(6) Controlling the 2x2 optical switch to be in a second connection state, outputting a pump light pulse signal by a pump light signal source, outputting a detection light pulse signal by a detection light signal source, enabling the two signals to meet in a second detected optical fiber between an optical fiber connection point and an optical fiber clamping point of an optical fiber clamp holder b, and when the two signals meet, the pump light pulse signal passes through the optical fiber connection point, the detection light pulse signal does not pass through the optical fiber connection point yet, and recording the optical power of the received detection light signal into P by the optical detector through measuring the optical power of the received detection light signal 4 ；
(7) The control unit controls the 2x2 optical switch to be in a second connection state, the pump light signal source outputs a pump light pulse signal, the detection light signal source outputs a detection light pulse signal, the two signals meet in a first detected optical fiber between the optical fiber connection point and the optical fiber clamping point of the optical fiber clamp holder a, the detection light pulse signal passes through the optical fiber connection point, the pump light pulse signal does not pass through the optical fiber connection point yet, the optical detector measures the optical power of the received detection light signal and records the optical power as P 5 ；
(8) The fiber connection loss value A is calculated as follows under a 1550nm window:
A＝5*lg(((P 3 -P 0 )*(P 5 -P 1 ))/((P 2 -P 0 )*(P 4 -P 1 ))。
the pump light pulse signal and the detection light pulse signal are coupled into the tested optical fiber or the detection light pulse signal is taken out from the tested optical fiber respectively at the left side and the right side of the optical fiber connection point by two optical fiber holders, and the optical fiber holders are used for carrying out optical coupling in a mode of bending the tested optical fiber, namely bending the tested optical fiber to the curvature of several millimeters, so that the pump light pulse signal or the detection light pulse signal can be coupled into the tested optical fiber or the detection light pulse signal is taken out from the tested optical fiber.
By changing the state of the 2 × 2 optical switch, the direction in which the pump optical pulse signal and the probe optical pulse signal enter the optical fiber to be tested can be changed, that is: the pump light pulse signal enters the tested optical fiber from the left side of the optical fiber connection point, and the probe light pulse signal enters the tested optical fiber from the right side of the optical fiber connection point; or the pump light pulse signal enters the tested optical fiber from the right side of the optical fiber connection point, and the probe light pulse signal enters the tested optical fiber from the left side of the optical fiber connection point.
The optical directional coupler is used for separating a pump optical pulse signal and a detection optical pulse signal, the pump optical pulse signal enters the 2x2 optical switch through the optical directional coupler, then enters the optical holder and is coupled into the optical fiber to be detected; the detection light pulse signal is coupled out from the detected optical fiber through the optical holder, enters the optical directional coupler, is sent to the optical filter and then enters the optical detector.
Controlling a pumping light signal source and a detecting light signal source to enable the pumping light pulse signals and the detecting light pulse signals to have certain correlation in time sequence, and enabling the pumping light pulse signals and the detecting light pulse signals to be arranged in a tested optical fiber to meet or not to meet by changing the positions of the two light pulse signals in time; when the pump optical pulse signal and the probe optical pulse signal meet in the optical fiber under test, it can be selected to arrange that the two signals meet at the fiber holder a side of the connection point of the optical fiber under test, that is: when the pump light pulse signal and the detection light pulse signal meet in the tested optical fiber, the pump light pulse signal passes through the optical fiber connection point, and the detection light pulse signal does not pass through the optical fiber connection point yet, or is located at the side of the optical fiber holder b of the tested optical fiber connection point, namely: when the pump light pulse signal and the detection light pulse signal meet in the detected optical fiber, the detection light pulse signal passes through the optical fiber connection point, and the pump light pulse signal does not pass through the optical fiber connection point yet.
If the pump light pulse signal and the detection light pulse signal meet in the tested optical fiber, an interaction-Raman effect is generated, and the detection light pulse signal is amplified by the pump light pulse signal; if the pump optical pulse signal and the detection optical pulse signal do not meet in the tested optical fiber, the detection optical pulse signal is not amplified by the pump optical pulse signal, and the meeting position of the two optical pulse signals is at the side of the optical fiber holder a of the connection point of the tested optical fiber or at the side of the optical fiber holder b of the connection point of the tested optical fiber, so that the amplification amount of the detection optical pulse signal by the pump optical pulse signal is different, the loss information of the connection point of the tested optical fiber is contained in the detection optical pulse signal and the detection optical pulse signal, the detection optical pulse signal is taken out from the right side of the connection point of the tested optical fiber, and the detection optical pulse signal is measured, and the optical fiber connection loss value of the connection point of the tested optical fiber is obtained.
The device can accurately measure the loss of the optical fiber fusion splice, and has the advantages of convenient use, good operability, strong practicability and low cost. The measuring method is simple to operate, high in practicability, capable of saving construction cost and improving production efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment;
fig. 2 is a schematic diagram illustrating that the pump light pulse signal and the probe light pulse signal meet at the left side of the connection point of the tested optical fiber when the 2 × 2 optical switch is in the first connection state in the embodiment;
fig. 3 is a schematic diagram illustrating that the pump light pulse signal and the probe light pulse signal meet at the right side of the connection point of the tested optical fiber when the 2 × 2 optical switch is in the first connection state in the embodiment;
fig. 4 is a schematic diagram illustrating that the pump light pulse signal and the probe light pulse signal meet at the right side of the connection point of the tested optical fiber when the 2 × 2 optical switch is in the second connection state in the embodiment;
fig. 5 is a schematic diagram illustrating that the pump light pulse signal and the probe light pulse signal meet at the left side of the connection point of the tested optical fiber when the 2 × 2 optical switch is in the second connection state in the embodiment.
Detailed Description
The invention will be further illustrated, but not limited, by the following description of the embodiments with reference to the accompanying drawings.
Example (b):
referring to fig. 1, an optical fiber connection loss measuring apparatus includes an optical fiber holder a, an optical fiber holder b, a pump light signal source, a probe light signal source, a 2x2 optical switch, a light directional coupler, an optical filter, and an optical signal detector, where one end of the optical fiber holder a is connected to a first measured optical fiber 1, and the other end is connected to the 2x2 optical switch; one end of the optical fiber holder b is connected with a second measured optical fiber 2, and the other end of the optical fiber holder b is connected with a 2x2 optical switch; the other two ports of the 2x2 optical switch are respectively connected with a detection optical signal source and a public port of the optical directional coupler; one of the rest two ports of the optical directional coupler is connected with a pump optical signal source, and the other port of the optical directional coupler is connected with an optical signal detector through an optical filter.
The pump light signal source is used for generating optical pulse signals with a 1550nm window, the width range of the optical pulse signals is 1n-100ns, and the range of peak optical power is +30dBm- +60dBm.
The detection light signal source is used for generating a light pulse signal with a window of 1625nm, the width range of the light pulse signal is 1ns-100ns, and the range of peak light power is-10 dBm- +20dBm.
Referring to fig. 2, 3, 4 and 5, the measurement method using the optical fiber connection loss measurement device includes the following steps:
(1) Respectively clamping a first tested optical fiber 1 and a second tested optical fiber 2 at two sides of an optical fiber connection point by using an optical fiber holder a and an optical fiber holder b, wherein the lengths of the optical fibers from the optical fiber connection point to the optical fiber holding point a and from the optical fiber holding point b are within the range of 0.5-10 m;
(2) Controlling a 2x2 optical switch to be in a first connection state 1, controlling a pump light signal source and a detection light signal source, sending a detection light pulse signal, not sending the pump light pulse signal, measuring the power of the received detection light signal by an optical receiver, and recording the power as P 0 ；
(3) Controlling a 2x2 optical switch to be in a first connection state 1, outputting a pump light pulse signal by a pump light signal source, outputting a detection light pulse signal by a detection light signal source, enabling the two signals to meet in a first detected optical fiber 1 between an optical fiber connection point and an optical fiber clamping point of an optical fiber clamp holder a, and when the two signals meet, enabling the pump light pulse signal to be in a first connection stateThe signal passes through the optical fiber connection point, the detection light pulse signal does not pass through the optical fiber connection point, the optical detector measures the light power of the received detection light signal and records the light power as P 2 ；
(4) Controlling a 2x2 optical switch to be in a first connection state 1, outputting a pump light pulse signal by a pump light signal source, outputting a detection light pulse signal by a detection light signal source, enabling the two signals to meet in a second detected light fiber 2 between a fiber connection point and a fiber clamping point of a fiber clamp b, wherein when the two signals meet, the detection light pulse signal passes through the fiber connection point, the pump light pulse signal does not pass through the fiber connection point yet, measuring the light power of the received detection light signal by a light detector, and recording the light power as P 3 ；
(5) Controlling the 2x2 optical switch to be in a second connection state 2, controlling the pump light signal source and the detection light signal source, sending out a detection light pulse signal, not sending out the pump light pulse signal, measuring the power of the received detection light signal by the optical receiver, and recording the power as P 1 ；
(6) Controlling a 2x2 optical switch to be in a second connection state 2, outputting a pump light pulse signal by a pump light signal source, outputting a detection light pulse signal by a detection light signal source, enabling the two signals to meet in a second detected light fiber 2 between a fiber connection point and a fiber clamping point of a fiber clamp b, wherein when the two signals meet, the pump light pulse signal passes through the fiber connection point, the detection light pulse signal does not pass through the fiber connection point yet, measuring the light power of the received detection light signal by a light detector, and recording the light power as P 4 ；
(7) The control unit controls the 2x2 optical switch to be in a second connection state 2, the pump light signal source outputs a pump light pulse signal, the detection light signal source outputs a detection light pulse signal, the two signals meet in a first detected optical fiber 1 from an optical fiber connection point to an optical fiber clamping point of an optical fiber clamping device a, the detection light pulse signal passes through the optical fiber connection point, the pump light pulse signal does not pass through the optical fiber connection point yet, the optical detector measures the optical power of the received detection light signal and records the optical power as P 5 ；
(8) The fiber connection loss value A is calculated as follows under a 1550nm window:
A＝5*lg(((P 3 -P 0 )*(P 5 -P 1 ))/((P 2 -P 0 )*(P 4 -P 1 ))。
the detection optical signal passes through the 2x2 optical switch, is coupled into the bare optical fiber 1 of the measured optical fiber through the optical fiber holder a, passes through the connecting point of the measured optical fiber and the bare optical fiber 2 of the measured optical fiber, is coupled and taken out through the optical fiber holder b, passes through the 2x2 optical switch, the optical directional coupler and the optical filter, and is sent to the optical signal detector for optical power measurement. According to the selected state of the 2x2 optical switch, the detection optical signal can also go through another route, the detection optical signal passes through the 2x2 optical switch, then is coupled into the bare fiber 2 of the measured optical fiber through the optical fiber holder b, is coupled and taken out through the optical fiber holder a after passing through the measured optical fiber connection point and the bare fiber 1 of the measured optical fiber, and then is sent to the optical signal detector through the 2x2 optical switch, the optical directional coupler and the optical filter for optical power measurement.
The pump light signal enters the 2x2 optical switch through the optical directional coupler, is coupled to the bare fiber 2 of the measured optical fiber through the fiber holder b, passes through the measured optical fiber connection point, and enters the bare fiber 1 of the measured optical fiber. According to the selected state of the 2x2 optical switch, the pump optical signal can also go to another route, and the pump optical signal enters the 2x2 optical switch through the optical directional coupler, is coupled to the bare fiber 1 of the measured optical fiber through the optical fiber holder a, and enters the bare fiber 2 of the measured optical fiber after passing through the measured optical fiber connection point.
The pump light pulse signal and the detection light pulse signal are respectively coupled into the tested optical fiber from the left side and the right side of the connection point of the tested optical fiber through two optical fiber holders, or the detection light pulse signal is taken out from the tested optical fiber. The optical fiber holder is used for optical coupling by bending the measured optical fiber, that is, bending the measured optical fiber to a curvature of several millimeters, so that the pump optical pulse signal or the probe optical pulse signal can be coupled into the measured optical fiber or the probe optical pulse signal can be taken out from the measured optical fiber. The coupling loss of the fiber holder ranges from 10dB to 25dB.
Through the 2 × 2 optical switch, the direction in which the pump optical pulse signal and the probe optical pulse signal enter the optical fiber to be measured can be changed, that is: a pump light pulse signal enters from a left bare fiber 1 of a connection point of a tested optical fiber, and a probe light pulse signal enters from a right bare fiber 2 of the connection point of the tested optical fiber; alternatively, the pump light pulse signal enters from the right bare fiber 2 on the side of the connection point of the measured optical fiber, and the probe light pulse signal enters from the left bare fiber 1 on the side of the connection point of the measured optical fiber.
The optical directional coupler is used for separating or coupling the pump optical pulse signal and the detection optical pulse signal, and the pump optical pulse signal enters the 2x2 optical switch after passing through the optical directional coupler. The detection light pulse signal is taken out from the detected optical fiber through the optical fiber holder, enters the 2x2 optical switch and the optical directional coupler, is sent to the optical filter and then enters the optical detector.
The optical filter is used for filtering the pumping optical signal and reserving the detection optical signal.
At the start of measurement, the optical fiber to be measured is first held on both sides of the optical fiber connection point using fiber holders, respectively, as shown in fig. 1. The lengths of the bare fiber 1 of the tested fiber and the bare fiber 2 of the tested fiber are 0.5m-10m, if the lengths are longer, although the measurement is facilitated, the optical fiber reserved during the optical fiber connection is required to be longer, which brings inconvenience to the fiber coiling work.
The control unit controls the pump light signal source and the detection light signal source to make the pump light pulse signals and the detection light pulse signals have a certain correlation in time sequence, and by changing the time positions of the two light pulse signals, the pump light pulse signals and the detection light pulse signals can be arranged to meet in the tested optical fiber or not arranged to meet in the tested optical fiber (in this case, the output of the pump light signal source can also be turned off).
As shown in fig. 2, corresponding to the first connection state 1 of the 2 × 2 optical switch, the pump light pulse signal enters the bare fiber 2 of the tested fiber from the right side of the connection point of the tested fiber (i.e., fiber holder b), the probe light pulse signal enters the bare fiber 1 of the tested fiber from the left side of the connection point of the tested fiber (i.e., fiber holder a), and when the pump light pulse signal and the probe light pulse signal meet in the tested fiber, it is arranged that the meeting place of the two signals is the left bare fiber 1 at the connection point of the tested fiber, that is: when the pump light pulse signal and the probe light pulse signal meet at the bare fiber 1 in the optical fiber to be tested, the pump light pulse signal passes through the optical fiber connection point, and the probe light pulse signal does not pass through the optical fiber connection point yet.
As shown in fig. 3, in response to the first connection state 1 of the 2 × 2 optical switch, the pump light pulse signal enters the bare fiber 2 of the tested optical fiber from the right side of the connection point of the tested optical fiber (i.e.: gripper b), the probe light pulse signal enters the bare fiber 1 of the tested optical fiber from the left side of the connection point of the tested optical fiber (i.e.: gripper a), and it is arranged that two signals meet at the right side bare fiber 2 of the connection point of the tested optical fiber, that is: when the pump light pulse signal and the detection light pulse signal meet with each other in the bare fiber 2 of the optical fiber to be tested, the detection light pulse signal passes through the fiber connection point, and the pump light pulse signal does not pass through the fiber connection point yet.
As shown in fig. 4, in response to the second connection state 2 of the 2 × 2 optical switch, the pump light pulse signal enters the bare fiber 1 of the measured optical fiber from the left side of the connection point of the measured optical fiber (i.e.: gripper a), the probe light pulse signal enters the bare fiber 2 of the measured optical fiber from the right side of the connection point of the measured optical fiber (i.e.: gripper b), and it is arranged that two signals meet at the right side bare fiber 2 of the connection point of the measured optical fiber, that is: when the pump light pulse signal and the probe light pulse signal meet with each other in the bare fiber 2 of the optical fiber to be tested, the pump light pulse signal passes through the optical fiber connection point, and the probe light pulse signal does not pass through the optical fiber connection point.
As shown in fig. 5, corresponding to the second connection state 2 of the 2 × 2 optical switch, the pump light pulse signal enters the bare fiber 1 of the tested optical fiber from the left side of the connection point of the tested optical fiber (i.e.: gripper a), the probe light pulse signal enters the bare fiber 2 of the tested optical fiber from the right side of the connection point of the tested optical fiber (i.e.: gripper b), and it is arranged that the two signals meet at the left side bare fiber 1 of the connection point of the tested optical fiber, that is: when the pump light pulse signal and the detection light pulse signal meet in the detected optical fiber, the detection light pulse signal passes through the optical fiber connection point, and the pump light pulse signal does not pass through the optical fiber connection point yet.
The control unit controls the connection state of the pump light signal source, the detection light signal source and the 2x2 optical switch, and the optical detector measures the received optical power in the following different states.
When the 2x2 optical switch is in the first connection state 1, the output of the pump optical signal source is closed, the detection optical signal source outputs a detection optical pulse signal, and the optical detector measures the received optical power P 0 。
When the 2x2 optical switch is in the first connection state 1, the pump optical signal source outputs a pump optical pulse signal, the detection optical signal source outputs a detection optical pulse signal, and the time-position relationship between the two signals enables the pump optical pulse signal and the detection optical pulse signal to satisfy the state shown in fig. 2, that is: when the pump light pulse signal and the probe light pulse signal meet at the bare fiber 1 in the optical fiber to be tested, the pump light pulse signal passes through the optical fiber connection point, and the probe light pulse signal does not pass through the optical fiber connection point yet. The light detector measures the received light power P 2 。
When the 2x2 optical switch is in the first connection state 1, the pump optical signal source outputs a pump optical pulse signal, the probe optical signal source outputs a probe optical pulse signal, and the time position relationship between the two signals enables the pump optical pulse signal and the probe optical pulse signal to satisfy the state shown in fig. 3, that is: when the pump light pulse signal and the probe light pulse signal meet at the bare fiber 2 in the optical fiber to be tested, the probe light pulse signal passes through the fiber connection point, and the pump light pulse signal does not pass through the fiber connection point yet. The light detector measures the received light power P 3 。
When the 2x2 optical switch is in the second connection state 2, the output of the pump optical signal source is closed, the detection optical signal source outputs a detection optical pulse signal, and the optical detector measures the received optical power P 1 。
When the 2x2 optical switch is in the second connection state 2, the pump optical signal source outputs a pump optical pulse signal, the probe optical signal source outputs a probe optical pulse signal, and the time-position relationship between the two signals enables the pump optical pulse signal and the probe optical pulse signal to satisfy the state shown in fig. 4, that is: the pump light pulse signal and the probe light pulse signal meet at the bare fiber 2 in the measured fiberIn the process, the pump light pulse signal passes through the optical fiber connection point, and the probe light pulse signal does not pass through the optical fiber connection point. The light detector measures the received light power P 4 。
When the 2x2 optical switch is in the second connection state 2, the pump optical signal source outputs a pump optical pulse signal, the probe optical signal source outputs a probe optical pulse signal, and the time-position relationship between the two signals enables the pump optical pulse signal and the probe optical pulse signal to satisfy the state shown in fig. 5, that is: when the pump light pulse signal and the detection light pulse signal meet at the bare fiber 1 in the optical fiber to be tested, the detection light pulse signal passes through the fiber connection point, and the pump light pulse signal does not pass through the fiber connection point yet. The light detector measures the received light power P 5 。
When the 2x2 optical switch is in the first connection state 1, the pump light signal is in the direction from the holder b to the holder a, and the optical fiber connection loss value A is in the 1550nm window b-a ＝10*lg((P 3 -P 0 )/(P 2 -P 0 ))。
When the 2x2 optical switch is in a connection state 2, the pump light signal is in the direction from the holder a to the holder b, and the optical fiber connection loss value A is in a 1550nm window a-b ＝10*lg((P 5 -P 1 )/(P 4 -P 1 ))。
Fiber connection loss value a at 1550nm window:
A＝(A b-a +A a-b )/2＝5*lg(((P 3 -P 0 )*(P 5 -P 1 ))/((P 2 -P 0 )*(P 4 -P 1 ))。
Claims (1)
1. a measuring method of an optical fiber connection loss measuring device comprises the optical fiber connection loss measuring device, wherein the optical fiber connection loss measuring device comprises an optical fiber holder a, an optical fiber holder b, a pumping light signal source, a detection light signal source, a 2x2 optical switch, an optical direction coupler, an optical filter and an optical signal detector, one end of the optical fiber holder a is connected with a first measured optical fiber, and the other end of the optical fiber holder a is connected with the 2x2 optical switch; one end of the optical fiber holder b is connected with a second tested optical fiber, and the other end of the optical fiber holder b is connected with a 2x2 optical switch; the other two ports of the 2x2 optical switch are respectively connected with a detection optical signal source and a public port of the optical directional coupler; one of the remaining two ports of the optical directional coupler is connected with a pump optical signal source, the other port of the optical directional coupler is connected with an optical signal detector through an optical filter, the pump optical signal source is used for generating optical pulse signals of a 1550nm window, the width range of the optical pulse signals is 1n-100ns, the peak optical power range is +30 dBm-60 dBm, the detection optical signal source is used for generating optical pulse signals of a 1625nm window, the width range of the optical pulse signals is 1ns-100ns, and the peak optical power range is-10 dBm-20 dBm, and the method is characterized by comprising the following steps of:
(1) Respectively clamping a first tested optical fiber and a second tested optical fiber at two sides of an optical fiber connection point by using an optical fiber holder a and an optical fiber holder b, wherein the lengths of the optical fibers from the optical fiber connection point to the optical fiber clamping point a and from the optical fiber clamping point b are within the range of 0.5-10 m;
(2) Controlling the 2x2 optical switch to be in a first connection state, controlling the pump light signal source and the detection light signal source, emitting a detection light pulse signal, not emitting the pump light pulse signal, measuring the power of the received detection light signal by the optical receiver, and recording the power as P 0 ；
(3) Controlling a 2x2 optical switch to be in a first connection state, outputting a pump light pulse signal by a pump light signal source, outputting a detection light pulse signal by a detection light signal source, enabling the two signals to meet in a first detected optical fiber between an optical fiber connection point and an optical fiber clamping point of an optical fiber clamp holder a, and when the two signals meet, the pump light pulse signal passes through the optical fiber connection point, the detection light pulse signal does not pass through the optical fiber connection point yet, and recording the optical power of the received detection light signal into P by an optical detector through measuring the optical power of the received detection light signal 2 ；
(4) Controlling a 2x2 optical switch to be in a first connection state, outputting a pump light pulse signal by a pump light signal source, outputting a detection light pulse signal by a detection light signal source, enabling the two signals to meet in a detected optical fiber 2 between an optical fiber connection point and an optical fiber clamping point of an optical fiber clamp b, and when the two signals meet, enabling the detection light pulse signal to pass through the optical fiber connection point, and the pump light pulse signalBefore passing through the optical fiber connection point, the optical detector measures the optical power of the received detection optical signal, and records the optical power as P 3 ；
(5) Controlling the 2x2 optical switch to be in a second connection state, controlling the pump light signal source and the detection light signal source, emitting a detection light pulse signal, not emitting the pump light pulse signal, measuring the power of the received detection light signal by the optical receiver, and recording the power as P 1 ；
(6) Controlling the 2x2 optical switch to be in a second connection state, outputting a pump light pulse signal by a pump light signal source, outputting a detection light pulse signal by a detection light signal source, enabling the two signals to meet in a second detected optical fiber between an optical fiber connection point and an optical fiber clamping point of an optical fiber clamp holder b, and when the two signals meet, the pump light pulse signal passes through the optical fiber connection point, the detection light pulse signal does not pass through the optical fiber connection point yet, and recording the optical power of the received detection light signal into P by the optical detector through measuring the optical power of the received detection light signal 4 ；
(7) The control unit controls the 2x2 optical switch to be in a second connection state, the pump light signal source outputs a pump light pulse signal, the detection light signal source outputs a detection light pulse signal, the two signals meet in a first detected optical fiber between an optical fiber connection point and an optical fiber clamping point of an optical fiber clamp holder a, the detection light pulse signal passes through the optical fiber connection point, the pump light pulse signal does not pass through the optical fiber connection point yet, the optical detector measures the optical power of the received detection light signal and records the optical power as P 5 ；
(8) The fiber connection loss value A is calculated as follows under a 1550nm window:
A = 5 * lg(((P 3 - P 0 ) * (P 5 - P 1 )) /((P 2 - P 0 ) * (P 4 - P 1 )))。
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| CN110849501B (en) * | 2019-10-30 | 2021-05-04 | 许昌许继软件技术有限公司 | Method for measuring and calibrating optical switch loss in distributed optical fiber temperature measuring device |
| CN113206702B (en) * | 2021-04-30 | 2023-07-28 | 国网新疆电力有限公司电力科学研究院 | Optical cable fault detection device and detection method thereof |
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