CN112816179A - Device and method for positioning fault point of optical cable - Google Patents
Device and method for positioning fault point of optical cable Download PDFInfo
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- CN112816179A CN112816179A CN201911126568.7A CN201911126568A CN112816179A CN 112816179 A CN112816179 A CN 112816179A CN 201911126568 A CN201911126568 A CN 201911126568A CN 112816179 A CN112816179 A CN 112816179A
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Abstract
The disclosure provides a device and a method for positioning a fault point of an optical cable, and belongs to the technical field of optical cables. The first light source capable of emitting the first optical signal and the second light source capable of emitting the second optical signal are arranged, the second optical signal has a smaller line width, and when the optical cable transmits the optical signal, the weak signal generated by artificial interference can enable the optical signal reflected by the second optical signal at the position to decay. When the optical cable fault point locating device is used, the first light source is turned on firstly, the attenuation curve corresponding to the first optical signal is obtained, the attenuation curve is stored, the fault point on the attenuation curve is marked, the first light source is turned off, the second light source is turned on, the attenuation curve corresponding to the second optical signal is obtained, the attenuation curve corresponding to the second optical signal is changed by changing the position of the artificial interference, the abscissa of the peak value of the attenuation curve corresponding to the second optical signal and the abscissa of the peak value of the attenuation curve corresponding to the first optical signal are finally enabled to be the same, the position of the artificial interference is the position of the optical cable fault point, the locating is accurate, and the fault point can be.
Description
Technical Field
The disclosure relates to the technical field of optical cables, in particular to a device and a method for positioning a fault point of an optical cable.
Background
In recent years, optical fiber communication technology has become the mainstream communication technology due to its characteristics of high speed, high safety, high reliability, low cost, and the like. The optical fiber communication network is greatly popularized and constructed in China, and the optical cable routing mileage is sharply increased. While fiber optic communications have grown rapidly, the maintenance of the growing fiber optic cabling has become increasingly burdensome and difficult. When a fault occurs at a certain position in the optical cable, problems such as instability of signal data transmitted through the optical cable section and even communication interruption are caused. Therefore, it is necessary to obtain the location of the fault point of the optical cable in time and repair the fault point to ensure the quality of optical fiber communication.
The currently commonly used device for positioning the optical cable fault point is mainly an OTDR (optical time-domain reflectometer), and the device can acquire attenuated information by utilizing backscattered light generated when light propagates in an optical fiber based on the principle of backward scattering and fresnel reverse, so as to acquire the position of the optical cable fault point.
However, the data measured by using the OTDR only reflects the cable distance between the fault point and the measurement device OTDR, and the cable distance is not the same as the actual distance between the fault point and the measurement device OTDR due to the cable having a coil left during the laying process, and it is difficult to accurately find the fault point on the ground based on the cable distance, so the positioning is inaccurate.
Disclosure of Invention
The embodiment of the disclosure provides a device and a method for positioning an optical cable fault point, which can solve the problem that the conventional device and method for positioning the optical cable fault point are inaccurate in positioning. The technical scheme is as follows:
in one aspect, an apparatus for locating a fault point of an optical cable is provided, the apparatus comprising: the device comprises a light source module, a switch module, a pulse light generation module, a circulator, a photoelectric conversion module, a signal acquisition module and a signal processing module which are sequentially connected through optical fibers;
the circulator is also used for connecting an optical cable to be tested;
the photoelectric conversion module, the signal acquisition module and the signal processing module are electrically coupled in sequence;
the light source module comprises a first light source for emitting a first optical signal and a second light source for emitting a second optical signal, wherein the first optical signal has a first line width, the second optical signal has a second line width, and the first line width is larger than the second line width;
the switch module is used for sequentially: turning on the first light source, turning off the first light source, turning on the second light source, and turning off the second light source;
the switch module is further configured to: sequentially transmitting the first optical signal and the second optical signal to the pulse light generation module;
the pulse light generation module is used for: emitting a first pulsed light signal based on the first light signal and a second pulsed light signal based on the second light signal;
the circulator is used for: transmitting the first pulse optical signal to the optical cable to be tested, transmitting a first reflected optical signal reflected from the optical cable to be tested to the photoelectric conversion module, transmitting the second pulse optical signal to the optical cable to be tested, and transmitting a second reflected optical signal reflected from the optical cable to be tested to the photoelectric conversion module;
the photoelectric conversion module is used for: converting the first reflected light signal into a first electric signal, transmitting the first electric signal to the signal acquisition module, converting the second reflected light signal into a second electric signal, and transmitting the second electric signal to the signal acquisition module;
the signal acquisition module is used for: collecting a preset number of third electric signals from the first electric signals, transmitting the third electric signals to the signal processing module, collecting a preset number of fourth electric signals from the second electric signals, and transmitting the fourth electric signals to the signal processing module;
the signal processing module is used for displaying an attenuation curve corresponding to the third electric signal and an attenuation curve corresponding to the fourth electric signal;
and acquiring the position of the optical cable fault point based on the attenuation curve corresponding to the third electric signal and the attenuation curve corresponding to the fourth electric signal.
In one possible design, the apparatus further includes: a signal generation module;
the signal generation module is electrically coupled with the pulse light generation module and used for controlling the pulse width of the pulse light signal emitted by the pulse light generation module.
In one possible design, the apparatus further includes: an amplifying module;
the pulse light generation module is connected with the circulator through the amplification module;
the amplifying module is used for amplifying the pulse light signals emitted by the pulse light generating module.
In one possible design, the apparatus further includes: coiling and reserving an optical cable with a preset length;
the circulator is connected with the optical cable to be tested through the optical cable reserved on the disc.
In one possible design, the first line width is greater than 100 kHz.
In one possible design, the second line width is less than 100 kHz.
In one possible design, the signal acquisition module is further electrically coupled to the light source module and the pulse light generation module, respectively.
In one possible design, the apparatus further includes a master clock;
the signal acquisition module, the light source module and the pulse light generation module are electrically coupled with the master clock respectively.
In one possible design, the signal acquisition module is an acquisition card.
In one possible design, the apparatus further includes: the light source module, the switch module, the pulse light generation module, the circulator, the photoelectric conversion module, the signal acquisition module and the signal processing module are all arranged in the shell;
the shell is also provided with an opening, and a display panel of the signal processing module is arranged in the opening.
In one aspect, a method for locating a fault point of an optical cable is provided, the method comprising:
turning on a first light source by a switch module, the first light source emitting a first optical signal;
based on the first optical signal, the pulse optical generating module emits a first pulse optical signal;
the circulator transmits the first pulse light signal to an optical cable to be tested, and transmits a first reflected light signal reflected from the optical cable to be tested to the photoelectric conversion module;
the photoelectric conversion module converts the first reflected light signal into a first electric signal and transmits the first electric signal to the signal acquisition module;
the signal acquisition module acquires a preset number of third electric signals from the first electric signals and transmits the third electric signals to the signal processing module;
the signal processing module displays an attenuation curve corresponding to the third electric signal;
turning on a second light source by a switch module, the second light source emitting a second light signal;
based on the second optical signal, the pulse optical generating module emits a second pulse optical signal;
the circulator transmits the second pulse light signal to an optical cable to be tested, and transmits a second reflected light signal reflected from the optical cable to be tested to the photoelectric conversion module;
the photoelectric conversion module converts the second reflected light signal into a second electric signal and transmits the second electric signal to the signal acquisition module;
the signal acquisition module acquires a preset number of fourth electric signals from the second electric signals and transmits the fourth electric signals to the signal processing module;
the signal processing module displays an attenuation curve corresponding to the fourth electric signal;
and manufacturing artificial interference along the optical cable, and acquiring the position of the artificial interference as the position of a fault point of the optical cable when the abscissa of the peak value of the attenuation curve corresponding to the third electric signal is the same as that of the peak value of the attenuation curve corresponding to the fourth electric signal.
The first light source capable of emitting the first optical signal and the second light source capable of emitting the second optical signal are arranged, the second optical signal has a smaller line width, and when the optical cable transmits the optical signal, the weak signal generated by artificial interference can enable the optical signal reflected by the second optical signal at the position to decay. When the optical cable fault point locating device is used, the first light source is turned on firstly, the attenuation curve corresponding to the first optical signal is obtained, the attenuation curve is stored, the fault point on the attenuation curve is marked, the first light source is turned off, the second light source is turned on, the attenuation curve corresponding to the second optical signal is obtained, the attenuation curve corresponding to the second optical signal is changed by changing the position of the artificial interference, finally, the abscissa of the peak value of the attenuation curve corresponding to the second optical signal is the same as that of the attenuation curve corresponding to the first optical signal, the position of the artificial interference is the position of the optical cable fault point, the locating is accurate, and the fault point can be repaired quickly.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an apparatus for locating a fault point of an optical cable according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a method for locating a fault point of an optical fiber cable according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of an attenuation curve for locating a fault point in an optical fiber cable according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a method for locating a fault point of a fiber optic cable according to an embodiment of the present disclosure;
fig. 5 is a flowchart of a method for locating a fault point of an optical cable according to an embodiment of the present disclosure.
The reference numerals for the various parts in the drawings are illustrated below:
1-a light source module;
11-a first light source, 12-a second light source;
2-a switch module;
3-a pulsed light generating module;
4-a circulator;
5-a photoelectric conversion module;
6-a signal acquisition module;
7-a signal processing module;
8-a signal generation module;
9-an amplification module;
10-coiling and reserving the optical cable;
11-shell.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
The following details the structure and the working principle of each part of the device:
fig. 1 is a schematic structural diagram of an apparatus for locating a fault point of an optical cable according to an embodiment of the present disclosure, please refer to fig. 1, the apparatus includes: the device comprises a light source module 1, a switch module 2, a pulse light generation module 3, a circulator 4, a photoelectric conversion module 5, a signal acquisition module 6 and a signal processing module 7 which are sequentially connected through optical fibers; the circulator 4 is also used for connecting an optical cable to be tested; the photoelectric conversion module 5, the signal acquisition module 6 and the signal processing module 7 are electrically coupled in sequence; the light source module 1 includes a first light source 11 for emitting a first optical signal having a first line width and a second light source 12 for emitting a second optical signal having a second line width, the first line width being greater than the second line width; the switch module 2 is configured to, in sequence: turning on the first light source 11, turning off the first light source 11, turning on the second light source 12, and turning off the second light source 12; the switch module 2 is also configured to: sequentially transmitting the first optical signal and the second optical signal to the pulse light generation module 3; the pulse light generation module 3 is configured to: emitting a first pulsed light signal based on the first light signal and a second pulsed light signal based on the second light signal; the circulator 4 is used for: transmitting the first pulse optical signal to the optical cable to be tested, transmitting a first reflected optical signal reflected from the optical cable to be tested to the photoelectric conversion module 5, transmitting the second pulse optical signal to the optical cable to be tested, and transmitting a second reflected optical signal reflected from the optical cable to be tested to the photoelectric conversion module 5; the photoelectric conversion module 5 is configured to: converting the first reflected light signal into a first electrical signal, transmitting the first electrical signal to the signal acquisition module 6, and converting the second reflected light signal into a second electrical signal, transmitting the second electrical signal to the signal acquisition module 6; the signal acquisition module 6 is configured to: collecting a preset number of third electrical signals from the first electrical signals and transmitting the third electrical signals to the signal processing module 7, and collecting a preset number of fourth electrical signals from the second electrical signals and transmitting the fourth electrical signals to the signal processing module 7; the signal processing module 7 is configured to display an attenuation curve corresponding to the third electrical signal and an attenuation curve corresponding to the fourth electrical signal; and acquiring the position of the optical cable fault point based on the attenuation curve corresponding to the third electric signal and the attenuation curve corresponding to the fourth electric signal.
The working principle of the device is described in detail below:
in the optical fiber communication process, the optical cable can be used for transmitting signals, and is also a distributed optical fiber sensing system, when any position of the optical cable is subjected to vibration, stress or temperature change due to third party intrusion or geological disaster external factors, signals reflected by the optical cable at the position can be changed, for example, attenuation or disconnection and the like. The device is used for acquiring the position information of the fault point of the optical cable based on the change of the signal.
Specifically, when an optical pulse is transmitted through the optical fiber, scattering and reflection of light occur due to the properties of the optical fiber itself, connectors, joints, bends, or the like, wherein a portion of the scattered and reflected light returns to the circulator 4, and the returned light signal carries a corresponding position signal and a corresponding time signal. The distance can be calculated by determining the speed of light in the glass material from the time it takes to transmit a signal to return a signal.
After the laser emitted from the laser is vibrated, one or more longitudinal modes are generated, and the frequency range of each longitudinal mode is the line width of the laser. During the use of the device, the attenuation curve of the fault point of the optical cable is obtained based on the first optical signal, and the attenuation curve of the jamming point is obtained based on the second optical signal, and the jamming action is used for artificially manufacturing a vibration, stress or temperature change signal which can be detected by the optical cable, for example, the vibration can be generated by hammering the ground, the stress can be generated by adding a heavy object on the ground, or the temperature change can be generated by splashing hot water on the ground, which is not limited in the embodiment. By applying the second optical signal with the second line width, the optical cable can sensitively identify the jamming signal and transmit the information of the jamming back under the condition that the strength of the jamming signal is weak.
The use process of the device comprises the following steps:
in the first step, a first attenuation curve including a fault point of the optical cable is obtained by using a first light source 11, the position of an attenuation point or a break point on the first attenuation curve is marked as a static point, and the static point is stored as a reference.
The first light source 11 and the second light source 12 are not switched into the light path at the same time.
And secondly, manufacturing the change of the physical quantity which can be sensed by using a second light source 12 in an artificial interference mode, and acquiring a second attenuation curve comprising an artificial interference point, wherein different algorithms are matched for sensing different physical quantities, and an industry standard sensing process is used as a standard.
And thirdly, enabling the second attenuation curve to correspond to the first attenuation curve by changing the position of the artificial interference point, wherein the position of the artificial interference point at the moment is the fault point of the optical cable.
The first light source 11 is a light emitting part which is used for distributed measurement of the optical fiber attenuation condition by the equipment, and when the first light source 11 is connected, the equipment can perform distributed measurement on the optical attenuation condition on the optical cable and locate the optical cable mileage at the fault point of the optical cable.
FIG. 2 is a schematic diagram of a method for locating a fault point of an optical fiber cable according to an embodiment of the present disclosure; referring to fig. 2, when a person walks along the axial direction of the optical cable, the person moves the same distance each time, and an artificial interference signal is generated.
Please refer to fig. 3 for a first attenuation curve corresponding to the optical cable signal and a second attenuation curve corresponding to the jamming signal, fig. 3 is a schematic diagram of an attenuation curve for locating a fault point of an optical cable according to an embodiment of the present disclosure; the horizontal axis of the diagram represents cable distance in m; the vertical axis represents the relative magnitude of the physical quantity without dimension; the solid line represents a first attenuation curve measured in the operating condition of the cable; the dashed line represents a second attenuation curve measured by human experimentation.
The top point of the first attenuation curve is a static point and corresponds to the position of a fault point of the optical cable; the second attenuation curve can change along with the walking of a person and the change of the intensity of the man-made interference, and the vertex of the second attenuation curve is an active point and corresponds to the position of the man-made interference point; through the combination of dynamic and static states, when the abscissa corresponding to the peak value of the first attenuation curve and the peak value of the second attenuation curve is the same, the local geographic position where the optical cable fault point is located can be determined.
Based on the attenuation curve, the axial direction of the optical cable is used as a walking path, and the position of the artificial interference signal is adjusted until the optical cable distances corresponding to the peak positions of the two attenuation curves are relatively close, and the artificial interference signal is located at the first central point. On the basis of the first central point, a cross positioning method is adopted, the optical cable continues to walk perpendicular to the axial direction of the optical cable, and the optical cable moves for the same distance each time, please refer to fig. 4, where fig. 4 is a schematic diagram of a method for positioning an optical cable fault point provided by the embodiment of the present disclosure, until the abscissa corresponding to the peak values of the two attenuation curves is the same, and the position of the artificial interference point at this time is the optical cable fault point, that is, the measured routing position of the optical cable fault point.
The cross positioning method is adopted in the steps, namely the position of the closest point is determined from the direction parallel to the optical cable, and then the position of the closest point is further determined from the direction vertical to the optical cable, so that the positioning can be rapidly and accurately performed.
By arranging the first light source 11 capable of emitting the first optical signal and the second light source 12 capable of emitting the second optical signal which has a smaller line width, when the optical cable transmits the optical signal, the weak signal generated by the artificial interference can decay the optical signal reflected by the second optical signal at the position. When the optical cable fault point locating device is used, the first light source 11 is firstly turned on, the attenuation curve corresponding to the first optical signal is obtained, the attenuation curve is stored, the fault point on the attenuation curve is marked, the first light source 11 is turned off, the second light source 12 is turned on, the attenuation curve corresponding to the second optical signal is obtained, the attenuation curve corresponding to the second optical signal is changed by changing the position of artificial interference, finally the abscissa of the peak value of the attenuation curve corresponding to the second optical signal is the same as that of the attenuation curve corresponding to the first optical signal, the position of the artificial interference is the position of the optical cable fault point, the locating is accurate, and the fault point can be conveniently and quickly repaired.
The following details the structure and the working principle of each part of the device:
in one possible design, the apparatus further includes: a signal generation module 8; the signal generating module 8 is electrically coupled to the pulse light generating module 3, and is configured to control a pulse width of the pulse light signal emitted by the pulse light generating module 3.
The pulsed light generation module 3 may be an acousto-optic modulator or an electro-optic modulator. Based on above-mentioned structure, can adjust signal generation module 8 according to the needs of accuracy, control pulse optical signal's pulse width to acquire different optical distance resolution, improve the positioning performance of system.
In one possible design, the apparatus further includes: an amplification module 9; the pulse light generating module 3 is connected with the circulator 4 through the amplifying module 9; the amplifying module 9 is used for amplifying the pulse light signal emitted by the pulse light generating module 3.
The amplification refers to increasing the energy of a pulsed optical signal, and specifically, the optical amplifier is based on the stimulated emission principle of light, and the amplification is realized by converting the energy of pump light into the energy of signal light. After the light is amplified, the farthest distance reached by the light energy can be longer, and the detection range of the device to the fault point of the optical cable is larger. Specifically, the amplifying module 9 may be a raman Amplifier or an EDFA (Erbium-doped Fiber Amplifier), which is not limited in this embodiment.
In one possible design, the apparatus further includes: coiling and reserving the optical cable 10 with a preset length; the circulator 4 is connected to the cable under test via the stub cable 10.
The spooled fiber optic cable 10 is used, among other things, to offset test blind spots created by optical coupling, where the blind spots may be a series of "blind spots" created by saturation of the receiving end due to reflections from characteristic points such as moving connectors, mechanical splices, and the like. So that the optical signals reflected by the optical cable to be tested can be transmitted to the photoelectric conversion module 5. Specifically, the length of the optical fiber cable 10 can be set according to the requirement, for example, 100 meters, and the embodiment is not limited thereto.
The rear end of the optical cable 10 may also be connected to an outlet pigtail, and the outlet pigtail may be connected to the optical cable to be tested in a fusion mode or in other modes, which is not limited in this embodiment.
In one possible design, the first line width is greater than 100 kHz. Meets the daily monitoring requirement of the optical cable.
In one possible design, the second line width is less than 100 kHz. The method is suitable for the jamming signals with weak strength.
In a possible design, the signal collection module 6 is further electrically coupled to the light source module 1 and the pulse light generation module 3, respectively. The clocks of the three are synchronized, thereby facilitating the subsequent signal processing work.
In one possible design, the apparatus further includes a master clock; the signal collection module 6, the light source module 1 and the pulse light generation module 3 are electrically coupled to the master clock respectively. The master clock is used for synchronizing the clocks of the three, thereby facilitating subsequent signal processing work.
In one possible design, the signal acquisition module 6 is an acquisition card. The acquisition card is mainly a capturing device which captures external analog signals such as photoelectricity, video and audio and guides the analog signals into a computer for digital processing in a digital mode, and mainly comprises an image acquisition card, a video acquisition card, an audio acquisition card data acquisition card and the like. Is a device that can acquire, quantize, and encode analog video signals. In this embodiment, a data acquisition card may be used to acquire data in the second electrical signal transmitted by the photoelectric conversion module 5 and transmit the data to the signal processing module 7.
Acquiring a preset number of second electrical signals from the first electrical signals through an acquisition card, wherein the number of the preset number depends on the number of points of the acquisition card, for example, a 5000-point acquisition card can be used, and the preset number can be 5000; or 10000 points of acquisition cards are adopted, and the preset number can be 10000.
Furthermore, after the range of the fault point is determined, the acquisition range of the acquisition card is adjusted to be narrowed to be close to the fault point, so that the sampling resolution can be improved, and the resolution of the system for positioning the fault point of the optical cable is improved. Specifically, for example, an optical cable line with a total length of 50km is tested by using a 5000-point acquisition card, and when the acquisition card acquires signals of test points on the whole line, the resolution is 10 m; when the fault point is locked, signals of only a test point in a 2km range near the fault point can be collected, and the resolution is 0.4 m. The position of the fault point obtained by positioning is more accurate, and the workload is reduced for subsequent repair work.
In the comparison between the first step and the second step, and the comparison between the third step, although different light sources are connected, the photoelectric conversion module 5, the signal acquisition module 6 and the signal processing module 7 all adopt the same set of equipment and have the same parameters, so that the cross axes of two times of measurement are the same, a uniform basis is provided for subsequent comparison, the measurement result is more accurate, and the accuracy of the measurement result of the system is improved.
For example, when the moving point is within 1km from the stationary point, the resolution of the signal acquisition module 6 may be adjusted, and only the attenuation and fiber positioning conditions of 1km around the stationary point are observed, thereby improving the resolution of the positioning process.
In one possible design, the apparatus further includes: the light source module 1, the switch module 2, the pulse light generating module 3, the circulator 4, the photoelectric conversion module 5, the signal acquisition module 6 and the signal processing module 7 are all arranged in the shell 11; the housing 11 is also provided with an opening in which the display panel of the signal processing module 7 is disposed.
The housing 11 integrates the device into a single unit for ease of assembly and removal, and the modules are relatively independent from one another for ease of individual repair or replacement. The attenuation curve displayed by the signal processing module 7 may be signal intensity, wavelength or a ratio thereof, and the like, which is not limited in this embodiment.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
Fig. 5 is a flowchart of a method for locating a fault point of an optical cable according to an embodiment of the present disclosure, please refer to fig. 5, where the method includes:
501. the first light source 11 is switched on by the switching module 2, which first light source 11 emits a first light signal.
502. Based on the first light signal, the pulsed light generating module 3 emits a first pulsed light signal.
503. The circulator 4 transmits the first pulse light signal to an optical cable to be tested, and transmits a first reflected light signal reflected from the optical cable to be tested to the photoelectric conversion module 5.
504. The photoelectric conversion module 5 converts the first reflected light signal into a first electrical signal, and transmits the first electrical signal to the signal acquisition module 6.
505. The signal acquisition module 6 acquires a preset number of third electrical signals from the first electrical signals, and transmits the third electrical signals to the signal processing module 7.
506. The signal processing module 7 displays the attenuation curve corresponding to the third electrical signal.
507. The second light source 12 is switched on by the switch module 2, the second light source 12 emitting a second light signal.
508. Based on the second light signal, the pulsed light generating module 3 emits a second pulsed light signal.
509. The circulator 4 transmits the second pulse optical signal to the optical cable to be tested, and transmits a second reflected optical signal reflected from the optical cable to be tested to the photoelectric conversion module 5.
510. The photoelectric conversion module 5 converts the second reflected light signal into a second electrical signal, and transmits the second electrical signal to the signal acquisition module 6.
511. The signal acquisition module 6 acquires a preset number of fourth electrical signals from the second electrical signals, and transmits the fourth electrical signals to the signal processing module 7.
512. The signal processing module 7 displays an attenuation curve corresponding to the fourth electrical signal.
513. And manufacturing artificial interference along the optical cable, and acquiring the position of the artificial interference as the position of a fault point of the optical cable when the abscissa of the peak value of the attenuation curve corresponding to the third electric signal is the same as that of the peak value of the attenuation curve corresponding to the fourth electric signal.
By arranging the first light source 11 capable of emitting the first optical signal and the second light source 12 capable of emitting the second optical signal which has a smaller line width, when the optical cable transmits the optical signal, the weak signal generated by the artificial interference can decay the optical signal reflected by the second optical signal at the position. When the optical cable fault point locating device is used, the first light source 11 is firstly turned on, the attenuation curve corresponding to the first optical signal is obtained, the attenuation curve is stored, the fault point on the attenuation curve is marked, the first light source 11 is turned off, the second light source 12 is turned on, the attenuation curve corresponding to the second optical signal is obtained, the attenuation curve corresponding to the second optical signal is changed by changing the position of artificial interference, finally the abscissa of the peak value of the attenuation curve corresponding to the second optical signal is the same as that of the attenuation curve corresponding to the first optical signal, the position of the artificial interference is the position of the optical cable fault point, the locating is accurate, and the fault point can be conveniently and quickly repaired.
The foregoing is considered as illustrative of the embodiments of the disclosure and is not to be construed as limiting thereof, and any modifications, equivalents, improvements and the like made within the spirit and principle of the disclosure are intended to be included within the scope of the disclosure.
Claims (11)
1. An apparatus for locating a point of failure in an optical fiber cable, the apparatus comprising: the device comprises a light source module (1), a switch module (2), a pulse light generation module (3), a circulator (4), a photoelectric conversion module (5), a signal acquisition module (6) and a signal processing module (7) which are sequentially connected through optical fibers;
the circulator (4) is also used for connecting an optical cable to be tested;
the photoelectric conversion module (5), the signal acquisition module (6) and the signal processing module (7) are electrically coupled in sequence;
the light source module (1) comprises a first light source (11) for emitting a first optical signal and a second light source (12) for emitting a second optical signal, the first optical signal having a first linewidth and the second optical signal having a second linewidth, the first linewidth being larger than the second linewidth;
the switch module (2) is used for sequentially: -turning on the first light source (11), -turning off the first light source (11), -turning on the second light source (12) and-turning off the second light source (12);
the switch module (2) is further configured to: sequentially transmitting the first optical signal and the second optical signal to the pulsed light generation module (3);
the pulsed light generation module (3) is used for: emitting a first pulsed light signal based on the first light signal and a second pulsed light signal based on the second light signal;
the circulator (4) is used for: transmitting the first pulse light signal into the optical cable to be tested, transmitting a first reflected light signal reflected from the optical cable to be tested to the photoelectric conversion module (5), transmitting the second pulse light signal into the optical cable to be tested, and transmitting a second reflected light signal reflected from the optical cable to be tested to the photoelectric conversion module (5);
the photoelectric conversion module (5) is configured to: -converting the first reflected light signal into a first electrical signal, transmitting the first electrical signal to the signal acquisition module (6), and converting the second reflected light signal into a second electrical signal, transmitting the second electrical signal to the signal acquisition module (6);
the signal acquisition module (6) is configured to: -acquiring a preset number of third electrical signals from said first electrical signals, transmitting said third electrical signals to said signal processing module (7), and-acquiring a preset number of fourth electrical signals from said second electrical signals, transmitting said fourth electrical signals to said signal processing module (7);
the signal processing module (7) is used for displaying an attenuation curve corresponding to the third electric signal and an attenuation curve corresponding to the fourth electric signal;
and acquiring the position of the optical cable fault point based on the attenuation curve corresponding to the third electric signal and the attenuation curve corresponding to the fourth electric signal.
2. The apparatus of claim 1, further comprising: a signal generation module (8);
the signal generation module (8) is electrically coupled with the pulse light generation module (3) and used for controlling the pulse width of the pulse light signal emitted by the pulse light generation module (3).
3. The apparatus of claim 1, further comprising: an amplification module (9);
the pulse light generation module (3) is connected with the circulator (4) through the amplification module (9);
the amplifying module (9) is used for amplifying the pulse light signals emitted by the pulse light generating module (3).
4. The apparatus of claim 1, further comprising: coiling and remaining the optical cable (10) with a preset length;
and the circulator (4) is connected with the optical cable to be tested through the coiled optical cable (10).
5. The apparatus of claim 1, wherein the first line width is greater than 100 kHz.
6. The apparatus of claim 1, wherein the second line width is less than 100 kHz.
7. The apparatus according to claim 1, wherein the signal acquisition module (6) is further electrically coupled to the light source module (1) and the pulsed light generation module (3), respectively.
8. The apparatus of claim 1, further comprising a master clock;
the signal acquisition module (6), the light source module (1) and the pulse light generation module (3) are electrically coupled with the master clock respectively.
9. The device according to claim 1, characterized in that the signal acquisition module (6) is an acquisition card.
10. The apparatus of claim 1, further comprising: the light source module (1), the switch module (2), the pulse light generation module (3), the circulator (4), the photoelectric conversion module (5), the signal acquisition module (6) and the signal processing module (7) are all arranged in the shell (11);
an opening is further formed in the shell (11), and a display panel of the signal processing module (7) is arranged in the opening.
11. A method of locating a point of failure in an optical cable, the method comprising:
switching on a first light source (11) by means of a switching module (2), the first light source (11) emitting a first light signal;
based on the first light signal, the pulsed light generating module (3) emits a first pulsed light signal;
the circulator (4) transmits the first pulse light signal to an optical cable to be tested, and transmits a first reflected light signal reflected from the optical cable to be tested to a photoelectric conversion module (5);
the photoelectric conversion module (5) converts the first reflected light signal into a first electric signal and transmits the first electric signal to the signal acquisition module (6);
the signal acquisition module (6) acquires a preset number of third electrical signals from the first electrical signals and transmits the third electrical signals to the signal processing module (7);
the signal processing module (7) displays an attenuation curve corresponding to the third electric signal;
turning on a second light source (12) by a switch module (2), the second light source (12) emitting a second light signal;
based on the second light signal, the pulsed light generating module (3) emits a second pulsed light signal;
the circulator (4) transmits the second pulse light signal to an optical cable to be tested, and transmits a second reflected light signal reflected from the optical cable to be tested to a photoelectric conversion module (5);
the photoelectric conversion module (5) converts the second reflected light signal into a second electric signal, and transmits the second electric signal to the signal acquisition module (6);
the signal acquisition module (6) acquires a preset number of fourth electric signals from the second electric signals and transmits the fourth electric signals to the signal processing module (7);
the signal processing module (7) displays an attenuation curve corresponding to the fourth electric signal;
and manufacturing artificial interference along the optical cable, and when the abscissa of the peak value of the attenuation curve corresponding to the third electric signal is the same as that of the peak value of the attenuation curve corresponding to the fourth electric signal, acquiring the position of the artificial interference as the position of the fault point of the optical cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911126568.7A CN112816179A (en) | 2019-11-18 | 2019-11-18 | Device and method for positioning fault point of optical cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911126568.7A CN112816179A (en) | 2019-11-18 | 2019-11-18 | Device and method for positioning fault point of optical cable |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02226035A (en) * | 1989-02-27 | 1990-09-07 | Hamamatsu Photonics Kk | Method of locating fault point of optical fiber and apparatus therefor |
| CN103048117A (en) * | 2012-12-26 | 2013-04-17 | 桂林聚联科技有限公司 | Method for realizing accurate location of optical cable fault point through Raman scattering |
| US20160109327A1 (en) * | 2014-10-16 | 2016-04-21 | Texas Instruments Incorporated | Method and otdr apparatus for optical cable defect location with reduced memory requirement |
| CN106612146A (en) * | 2015-10-26 | 2017-05-03 | 深圳军信通科技有限公司 | System for rapidly finding and precisely positioning ground position of fault point of communication optical fiber |
| CN211452794U (en) * | 2019-11-18 | 2020-09-08 | 中国石油天然气集团有限公司 | Device for positioning fault point of optical cable |
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2019
- 2019-11-18 CN CN201911126568.7A patent/CN112816179A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02226035A (en) * | 1989-02-27 | 1990-09-07 | Hamamatsu Photonics Kk | Method of locating fault point of optical fiber and apparatus therefor |
| CN103048117A (en) * | 2012-12-26 | 2013-04-17 | 桂林聚联科技有限公司 | Method for realizing accurate location of optical cable fault point through Raman scattering |
| US20160109327A1 (en) * | 2014-10-16 | 2016-04-21 | Texas Instruments Incorporated | Method and otdr apparatus for optical cable defect location with reduced memory requirement |
| CN106612146A (en) * | 2015-10-26 | 2017-05-03 | 深圳军信通科技有限公司 | System for rapidly finding and precisely positioning ground position of fault point of communication optical fiber |
| CN211452794U (en) * | 2019-11-18 | 2020-09-08 | 中国石油天然气集团有限公司 | Device for positioning fault point of optical cable |
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