CN210536634U - Optical cable identification device - Google Patents
Optical cable identification device Download PDFInfo
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- CN210536634U CN210536634U CN201922498010.3U CN201922498010U CN210536634U CN 210536634 U CN210536634 U CN 210536634U CN 201922498010 U CN201922498010 U CN 201922498010U CN 210536634 U CN210536634 U CN 210536634U
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Abstract
The utility model discloses an optical cable identification device, which comprises a single polarization light source, an optical circulator, an optical polarization detector and an optical receiver; the optical circulator is respectively connected with the single-polarization light source and the optical polarization detector, the optical circulator is used for transmitting single-polarization light emitted by the single-polarization light source to an optical fiber of an optical cable to be detected, the optical circulator also transmits received light scattered back by the optical fiber to the optical polarization detector, the output end of the optical polarization detector is connected with the optical receiver, and the optical receiver is used for performing digital processing on the light output by the optical polarization detector to obtain an optical wave curve returned by the optical fiber; the optical cable identification device adopting the structure has the advantages of simple structure, low cost and high identification speed, does not need to interrupt the normal transmission of the current identified optical cable, and is applicable to common optical cables and bending-resistant optical cables.
Description
Technical Field
The utility model relates to an optical cable detects technical field, especially relates to an optical cable recognition device.
Background
Currently, fiber optic communications have become the primary means of communication networks, however, they are prone to error in identifying and managing the fiber optic cables (especially in emergency situations), and over time, those identifications can become degraded and even fall off of the fiber optic cables, making identification of the cables very difficult. Typically, many data resources, sand wells, and even pipelines of a network facilitator are common. In addition, due to the development and change of urban construction, the situations of machine room relocation, line transformation, optical cable rush-repair and the like are emerging continuously. How to rapidly and effectively carry out the relocation and the first-aid repair becomes a problem to be solved by line maintenance personnel, and it is important to accurately identify the optical cable needing to be repaired before operation.
Currently, there are 4 kinds of commonly used optical cable identification instruments: fiber identification devices, Optical Time Domain Reflectometers (OTDRs), optical cable research instruments, and optical multimeters. The optical fiber identification instrument adopts an optical fiber macrobending principle, injects an optical signal with a specific modulation frequency into one end of an optical fiber, bends the identified optical cable at the position where the optical cable needs to be identified, and detects whether the optical signal radiated by the bent optical fiber contains the specific modulation frequency signal, so as to judge whether the bent optical cable is a target optical cable which needs to be searched. When the OTDR is adopted to identify a target optical cable, one optical fiber is connected with the OTDR at one end of the optical cable, and the OTDR is in a real-time test mode. And (2) bending the identified optical cable (usually realized by rapidly freezing the optical cable) at the position where the optical cable needs to be identified, and observing whether the OTDR curve changes before and after the optical cable is bent, so as to judge whether the bent optical cable is the target optical cable needing to be searched. The optical cable survey instrument adopts the optical fiber interference principle to identify a target optical cable. The optical cable general survey instrument can convert knocking vibration information into an audio signal, lightly knock the identified optical cable at the position where the optical cable needs to be identified, and judge whether the knocked optical cable is the target optical cable to be searched or not by monitoring sound. When the optical multimeter is used for identifying a target optical cable, an optical signal with a specific modulation frequency is injected into one optical fiber at one end of the optical cable, and at the position where the optical cable needs to be identified, all the optical fibers contained in the optical cable are directly connected to an optical power detection end of the optical multimeter to detect whether the optical cable contains the specific modulation frequency signal or not, so that whether the optical cable connected to the optical multimeter is the target optical cable needing to be searched or not is judged. In the above 4 instruments, when an optical multimeter is used, it is necessary to interrupt the connection state of the identified optical cable, which means that the transmission service is interrupted if the identified optical cable is transmitting a service signal, which is not allowed in many cases. With fibre-optic identification and OTDR, it is necessary to bend the cable to a certain curvature (the bend diameter is less than 10mm), which is not problematic for ordinary cable jumpers, but for bend-resistant cables (cables conforming to standard g.657a or standard g.657b) this method requires bending the cable to a very small curvature (e.g. a bend diameter of less than 3mm), which can easily damage the cable. When the cable general survey method is adopted, the requirement that the reflection of the tail end of the optical cable is larger (for example, the reflection coefficient is larger than-20 dB) or the requirement that the distance between the knocking point and the tail end of the optical cable is larger than 500-1000 m is very strict for identifying the optical cable in a room environment or under an optical access network.
SUMMERY OF THE UTILITY MODEL
The present invention is to provide an optical cable identification device that is not enough for solving the above technical problems, and is suitable for both the ordinary optical cable and the bending-resistant optical cable, and can detect and identify the optical cable without interrupting the service signal normally transmitted by the optical cable.
In order to achieve the above object, the utility model discloses an optical cable identification device, which comprises a single polarization light source, an optical circulator, an optical polarization detector and an optical receiver; the optical circulator is respectively connected with the single-polarization light source and the optical polarization detector, the optical circulator is used for transmitting single-polarization light emitted by the single-polarization light source to optical fibers of an optical cable to be detected, the optical circulator also transmits received light scattered back by the optical fibers to the optical polarization detector, the output end of the optical polarization detector is connected with the optical receiver, and the optical receiver is used for carrying out digital processing on the light output by the optical polarization detector so as to obtain an optical wave curve returned by the optical fibers.
Preferably, the optical receiver includes an amplifier, an a/D converter, and a processor.
Preferably, the optical cable identification device further includes a display electrically connected to the optical receiver, and the display is configured to display the optical wave curve formed after processing by the optical receiver.
Preferably, the optical cable identification device further comprises a prompter electrically connected to the optical receiver, and when the change of the light wave curve in the optical receiver exceeds a preset value, the prompter sends a prompt signal.
Preferably, the single polarized light source is an optical pulse generator.
Preferably, the optical pulse generator is an F-P laser or a DFB laser.
Preferably, an optical pulse amplifier is further disposed between the optical pulse generator and the optical circulator.
Preferably, the optical receiver adopts an APD detector or a PIN detector
Compared with the prior art, the utility model discloses optical cable recognition device includes single polarized light source, the optical circulator, optical detection polarizer and optical receiver, during the use, the backscattering signal of optic fibre gets into optical receiver through optical circulator and optical detection polarizer in the optical cable of waiting to detect, after the processing of optical detection polarizer, the polarization state change information of optic fibre in optical fiber transmission can directly be demodulated to the backscattering signal from the optic fibre that receives, when the optical cable was crooked, optic fibre wherein also can produce corresponding bending, in optic fibre, the stress that the bending produced arouses optic fibre birefringence effect, thereby polarization state changes when making the optic signal pass through this flexure, thereby the light wave curve that makes optical receiver obtain changes, like this, alright reflect whether the operation of crooked optical cable exists, if along with the operation action of current crooked optical cable, corresponding change appears in the light wave curve of optical receiver output, the bent optical cable is not the optical cable which is sought by us; therefore, the optical cable identification device adopting the structure has the advantages of simple structure, low cost and high identification speed, does not need to interrupt the normal transmission of the current identified optical cable, and is applicable to common optical cables and bending-resistant optical cables.
Drawings
Fig. 1 is the schematic structural diagram of the optical cable identification device according to the embodiment of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.
As shown in fig. 1, the present invention discloses a variety of optical cable identification devices, including a single polarized light source 10, an optical circulator 12, an optical polarization detector 13 and an optical receiver 14; the optical circulator 12 is respectively connected with the single-polarization light source 10 and the optical polarization detector 13, the optical circulator 12 is used for transmitting the single-polarization light emitted by the single-polarization light source 10 to the optical fiber of the optical cable 100 to be detected, the optical circulator 12 also transmits the received light scattered back by the optical fiber to the optical polarization detector 13, the output end of the optical polarization detector 13 is connected with the optical receiver 14, and the optical receiver 14 is used for performing digital processing on the light output by the optical polarization detector 13 to obtain the light wave curve returned by the optical fiber.
The working principle of the optical cable identification device is as follows: the single polarization light output from the single polarization light source 10 is injected into the optical fiber of the tested optical cable 100 as the test optical signal after passing through the optical circulator 12, the test optical signal is continuously scattered back in the forward transmission process, and is sent to the optical polarization detector 13 for polarization test after passing through the optical circulator 12, and then is transmitted to the optical receiver 14, the optical receiver 14 can directly demodulate the polarization state change information of the optical signal in the optical fiber transmission from the received back scattering signal of the optical fiber, when the optical cable 100 is bent (the bending curvature is large, ten centimeters to one meter, and the optical fiber in the optical cable 100 does not generate obvious bending loss or damage to the optical cable 100), the optical fiber therein can also generate corresponding bending, in the optical fiber, the stress generated by the bending causes the optical fiber birefringence effect, so that the polarization state changes when the optical signal passes through the bending, and the optical wave curve obtained by the optical receiver 14 changes, thus, whether the operation of bending the optical cable 100 exists can be reflected, if the optical wave curve output by the optical receiver 14 changes correspondingly with the operation action of the current bent optical cable 100, it indicates that the bent optical cable 100 is the optical cable 100 that we want to find, otherwise; therefore, the optical cable identification device adopting the structure has the advantages of simple structure, low cost and high identification speed, does not need to interrupt the normal transmission of the current identified optical cable 100, and is suitable for common optical cables and bending-resistant optical cables. In practical application, the operation method is simple and practical, the optical cable 100 is not damaged, the time and cost for optical fiber network management and maintenance can be greatly reduced, and particularly, when the optical fiber patch cord is used for identifying the optical fiber patch cord in a machine room, the working efficiency can be greatly improved.
Preferably, the optical receiver 14 includes an amplifier 140, an a/D converter 141 and a processor 142, wherein the amplifier 140 is used for amplifying the polarized light received from the optical polarization analyzer 13, then converting it into an electrical signal by the a/D converter 141, and finally forming the electrical signal data into an optical wave curve by the processor 142. For the user to view, preferably, the optical receiver 14 is further electrically connected to a display 15, and the display 15 is used for displaying the optical wave curve formed after being processed by the optical receiver 14. In addition, the optical receiver 14 may also be electrically connected to a prompter 16, when the variation of the light wave curve in the optical receiver 14 exceeds a preset value, the prompter 16 sends out a prompt signal, and the prompter 16 may be a buzzer or a light emitting diode, so that the user can quickly know the identification condition.
In addition, in order to improve the recognition effect and speed, the single-polarization light source 10 is an optical pulse generator 10', the processor 142 in the receiver can control the operating state of the optical pulse generator 10', and the optical pulse generator 10' in this embodiment can adopt an F-P laser or a DFB laser. When an F-P laser is adopted, the wavelength is 1550nm, the spectral width is about 5nm, the peak power of the light pulse is 50-100 mW, and the light pulse width can be selected from 40ns, 80ns or 160 ns. The optical receiver 14 may employ an APD detector and, for 1km short range applications, a PIN detector to save costs. Preferably, an optical pulse amplifier 11 may be further disposed between the optical pulse generator 10' and the optical circulator 12 to obtain a stable and efficient optical inspection signal and improve the anti-interference capability of the optical cable identification apparatus of the present invention.
The specific operation mode of the optical cable identification device is as follows: when the optical cable 100 needs to be identified, as shown in fig. 1, one optical fiber is taken from one end point a of the identified optical cable 100 and connected to one interface on the optical circulator 12, then a test is started, bending operation is performed on the optical cable 100 to be identified at a point b of the optical cable 100 to be identified, the curvature radius of the bent optical cable 100 is 30-50 cm (if the optical cable 100 is identified in a machine room, the optical cable 100 is a soft jumper, or the optical cable 100 can be flicked by hand), and the time period of the action of bending the optical cable 100 is 2-5 s. If the optical wave curve on the display 15 changes correspondingly or the prompter 16 gives a prompt corresponding to the bending operation of the optical cable 100 along with the operation of bending the optical cable 100, it indicates that the bent optical cable 100 is the optical cable 100 that we want to find, otherwise, it needs to replace another optical cable 100 to repeat the above operations until the target optical cable 100 is found.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the invention is not limited thereto.
Claims (8)
1. An optical cable identification device is characterized by comprising a single-polarization light source, an optical circulator, an optical polarization detector and an optical receiver; the optical circulator is respectively connected with the single-polarization light source and the optical polarization detector, the optical circulator is used for transmitting single-polarization light emitted by the single-polarization light source to optical fibers of an optical cable to be detected, the optical circulator also transmits received light scattered back by the optical fibers to the optical polarization detector, the output end of the optical polarization detector is connected with the optical receiver, and the optical receiver is used for carrying out digital processing on the light output by the optical polarization detector so as to obtain an optical wave curve returned by the optical fibers.
2. The fiber optic cable identification device of claim 1, wherein the optical receiver comprises an amplifier, an a/D converter, and a processor.
3. The fiber optic cable identification device of claim 1, further comprising a display electrically connected to the optical receiver, the display configured to display the optical wave profile formed after processing by the optical receiver.
4. The optical cable identification device of claim 1, further comprising a prompt electrically connected to the optical receiver, the prompt emitting a prompt signal when the optical wave profile in the optical receiver changes beyond a predetermined value.
5. The fiber optic cable identification device of claim 1 wherein the single polarized light source is a light pulse generator.
6. The optical cable identification device of claim 5, wherein the optical pulse generator is a F-P laser or a DFB laser.
7. The optical cable identification device of claim 5, wherein an optical pulse amplifier is further disposed between the optical pulse generator and the optical circulator.
8. The fiber optic cable identification device of claim 1, wherein the optical receiver employs an APD detector or a PIN detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922498010.3U CN210536634U (en) | 2019-12-31 | 2019-12-31 | Optical cable identification device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922498010.3U CN210536634U (en) | 2019-12-31 | 2019-12-31 | Optical cable identification device |
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| CN210536634U true CN210536634U (en) | 2020-05-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136430A (en) * | 2021-12-02 | 2022-03-04 | 无锡市德科立光电子技术股份有限公司 | Accurate cable searching system and method |
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2019
- 2019-12-31 CN CN201922498010.3U patent/CN210536634U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136430A (en) * | 2021-12-02 | 2022-03-04 | 无锡市德科立光电子技术股份有限公司 | Accurate cable searching system and method |
| CN114136430B (en) * | 2021-12-02 | 2024-07-19 | 无锡市德科立光电子技术股份有限公司 | Accurate cable searching system and method |
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