CN211791516U - On-line optical cable monitoring system - Google Patents
On-line optical cable monitoring system Download PDFInfo
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- CN211791516U CN211791516U CN202021980494.1U CN202021980494U CN211791516U CN 211791516 U CN211791516 U CN 211791516U CN 202021980494 U CN202021980494 U CN 202021980494U CN 211791516 U CN211791516 U CN 211791516U
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Abstract
The utility model discloses an on-line optical cable monitoring system, which comprises an optical time domain reflectometer unit, an optical switch unit and a plurality of monitoring modules; one end of the optical time domain reflectometer unit is used for accessing or outputting monitoring light, and the other end of the optical time domain reflectometer unit is connected with the optical switch unit; each monitoring module comprises a wavelength division multiplexing unit, a transmission optical fiber and a light reflection unit; the transmission end of the wavelength division multiplexing unit is used for inputting or outputting signal light, the reflection end is connected with one port of the optical switch unit, the public end is connected with one end of the transmission optical fiber, the transmission end of the wavelength division multiplexing unit prevents the monitoring light from emitting, and the reflection end prevents the signal light from emitting; the other end of the transmission optical fiber is connected with one end of the light reflection unit, the other end of the light reflection unit is used for inputting or outputting signal light, and the light reflection unit reflects monitoring light. The utility model discloses can solve on-line monitoring time measuring, monitoring light influences the error code problem that sends out light source and receive end light receiver and lead to, realizes the on-line monitoring to many optic fibre in use.
Description
Technical Field
The utility model belongs to the technical field of the optical communication, concretely relates to online optical cable monitoring system.
Background
With the rapid development of optical fiber communication technology and the internet, the number of optical cables laid on the global scale is increasing. When the optical cable breaks down, the traditional manual optical cable operation and maintenance mode is low in efficiency, the fault processing duration is long, and the economic loss is serious. Meanwhile, the traditional optical cable operation and maintenance mode also faces huge pressure due to the huge number of optical cables and the complex optical cable network structure. Accordingly, fiber optic cable monitoring systems are becoming increasingly important.
At present, the optical cable monitoring system usually adopts an off-line monitoring mode, namely, a vacant fiber core in the optical cable is monitored, so that the condition of using the fiber core cannot be known. For the existing on-line optical cable monitoring technology, the isolation between the ports of the wavelength division multiplexing unit for the combined wave of the signal light and the monitoring light is usually low, and a unit for filtering the monitoring light is not arranged at the tail end of the forward transmission direction of the monitoring light.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides an online optical cable monitoring system can solve online monitoring time measuring, and monitoring light influences the error code problem that sends out light source and receive end optical receiver and lead to realize the on-line monitoring to many optic fibre in use.
In order to realize the technical purpose, reach above-mentioned technological effect, the utility model discloses a following technical scheme realizes:
an on-line optical cable monitoring system comprises an optical time domain reflectometer unit, an optical switch unit and a plurality of monitoring modules;
one end of the optical time domain reflectometer unit is used for accessing or outputting monitoring light, and the other end of the optical time domain reflectometer unit is connected with the input end of the optical switch unit;
each monitoring module comprises a wavelength division multiplexing unit, a transmission optical fiber and a light reflection unit; the transmission end of the wavelength division multiplexing unit is used for inputting or outputting signal light, the reflection end is connected with one port of the optical switch unit, the public end is connected with one end of the transmission optical fiber, the transmission end of the wavelength division multiplexing unit prevents the monitoring light from emitting, and the reflection end prevents the signal light from emitting; the other end of the transmission optical fiber is connected with one end of the light reflection unit; the other end of the light reflection unit is used for inputting or outputting signal light, and the light reflection unit reflects monitoring light.
As a further improvement of the present invention, when the signal light and the monitoring light are transmitted in the same direction in the transmission fiber, the signal light is output from the common end of the wavelength division multiplexing unit after being input from the transmission end of the wavelength division multiplexing unit, enters one end of the light reflection unit through the transmission fiber, and is then output from the other end of the light reflection unit; the monitoring light is output by the optical time domain reflectometer unit and then enters the optical switch unit, and then is output to the reflection end of the corresponding wavelength division multiplexing unit from the optical switch unit, then the monitoring light is output from the public end of the wavelength division multiplexing unit and enters the transmission optical fiber, one part of the monitoring light is continuously transmitted along the transmission optical fiber in the forward direction, the other part of the monitoring light is transmitted in the backward direction after being scattered by the transmission optical fiber, the monitoring light transmitted in the forward direction along the transmission optical fiber reaches the optical reflection unit and then is reflected and can not pass through, the monitoring light transmitted in the backward direction along the transmission optical fiber is output from the reflection end of the wavelength division multiplexing unit after being input from the public end of the wavelength division multiplexing unit, and the monitoring light output by the reflection end of the wavelength.
As a further improvement of the present invention, when the signal light and the monitoring light are reversely transmitted in the transmission fiber, the signal light is input from the light reflection unit, transmitted to the common end of the wavelength division multiplexing unit through the transmission fiber, and then transmitted to the transmission end from the common end of the wavelength division multiplexing unit for output; the monitoring light is output by the optical time domain reflectometer unit and then enters the optical switch unit, and then is output to the reflection end of the corresponding wavelength division multiplexing unit from the optical switch unit, then the monitoring light is output from the public end of the wavelength division multiplexing unit and enters the transmission optical fiber, one part of the monitoring light is continuously transmitted along the transmission optical fiber in the forward direction, the other part of the monitoring light is transmitted in the backward direction after being scattered by the transmission optical fiber, the monitoring light transmitted in the forward direction along the transmission optical fiber reaches the optical reflection unit and then is reflected and can not pass through, the monitoring light transmitted in the backward direction along the transmission optical fiber is output from the reflection end of the wavelength division multiplexing unit after being input from the public end of the wavelength division multiplexing unit, and the monitoring light output by the reflection end of the wavelength.
As the further improvement of the utility model, the isolation of transmission end pair monitoring light of wavelength division multiplexing unit is greater than 30dB, and the isolation of reflection end pair signal light is greater than 30 dB.
As a further improvement, the on-line optical cable monitoring system further comprises a monitoring light emission unit, the monitoring light wavelength range of the monitoring light emission unit is 1625~1650nm, and the dynamic range is less than or equal to 40 dB.
As a further improvement of the utility model, on-line optical cable monitoring system still includes signal light emission unit, the signal light wavelength range of signal light emission unit transmission is 1525~1565nm, and optical power is less than 4 dB.
As a further improvement of the present invention, the optical switch unit includes an input port and 48 output ports, the input port is connected to the optical time domain reflectometer unit, and each output port is connected to the wavelength division multiplexing unit in the corresponding monitoring module.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a pair of optical cable on-line monitoring system, through wavelength division multiplexing unit and the light reflection unit that the isolation is high between using the port respectively at transmission optical fiber both ends, solve on-line monitoring time measuring, monitoring light influences the error code problem that sends out light source and receive end light receiver and lead to realize the on-line monitoring to many optical fibers in use. Meanwhile, the system is relatively simple in structure and easy to realize.
Drawings
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings, in which:
fig. 1 is a schematic overall structure diagram of an on-line optical cable monitoring system according to an embodiment of the present invention;
wherein: the optical fiber system comprises a 1-optical time domain reflectometer unit, a 2-optical switch unit, a 3-wavelength division multiplexing unit, a 4-transmission optical fiber and a 5-optical reflection unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description of the present invention, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The following description is made in detail for the application of the principles of the present invention with reference to the accompanying drawings.
Can only off-line monitoring among the optical cable monitoring system to present, perhaps lead to signal light to produce the error code scheduling problem easily when monitoring on line, the utility model provides an on-line optical cable monitoring system through use wavelength division multiplexing unit and the light reflection unit that the port isolation is high respectively at transmission optic fibre both ends, solves on-line monitoring time measuring, and monitoring light influences the error code problem that sends out light source and receive end light receiver and lead to realize the on-line monitoring to many optic fibre in use. Meanwhile, the system is relatively simple in structure and easy to realize.
As shown in fig. 1, the on-line optical cable monitoring system specifically includes an optical time domain reflectometer unit 1, an optical switch unit 2, and a plurality of monitoring modules;
one end of the optical time domain reflectometer unit 1 is used for accessing or outputting monitoring light, and the other end of the optical time domain reflectometer unit 1 is connected with the input end of the optical switch unit 2;
each monitoring module comprises a wavelength division multiplexing unit 3, a transmission optical fiber 4 and a light reflection unit 5; the transmission end of the wavelength division multiplexing unit 3 is used for inputting or outputting signal light, the reflection end is connected with one port of the optical switch unit 2, the public end is connected with one end of the transmission optical fiber 4, the transmission end of the wavelength division multiplexing unit 3 prevents the monitoring light from emitting, and the reflection end prevents the signal light from emitting, preferably, the isolation degree of the transmission end of the wavelength division multiplexing unit 3 to the monitoring light is greater than 30dB, and the isolation degree of the reflection end to the signal light is greater than 30 dB; the other end of the transmission optical fiber 4 is connected with one end of the light reflection unit 5, the other end of the light reflection unit 5 is used for inputting or outputting signal light, and the light reflection unit 5 reflects monitoring light; the other end of the transmission optical fiber 4 is connected with one end of the light reflection unit 5, and the other end of the light reflection unit 5 is used for inputting or outputting signal light; the light reflection unit 5 transmits the signal light and reflects the monitor light.
In a specific embodiment of the present invention, the on-line optical cable monitoring system further includes a monitoring light emitting unit and a signal light emitting unit, the wavelength range of the monitoring light emitted by the monitoring light emitting unit is 1625-1650 nm, and the dynamic range is less than or equal to 40 dB; the signal light emitting unit emits signal light with wavelength ranging from 1525 nm to 1565nm and light power less than 4 dB.
In a specific embodiment of the present invention, the optical switch unit 2 includes an input port and 48 output ports, the input port is connected to the optical time domain reflectometer unit 1, and each output port is connected to the wavelength division multiplexing unit 3 in the corresponding monitoring module, so as to realize the switching connection between the input port and the 48 output ports.
To sum up, the utility model discloses an online optical cable monitoring system's function implementation process specifically as follows:
when the signal light and the monitoring light are transmitted in the same direction in the transmission fiber 4, the flow direction of the signal light is: after being input from the transmission end of the wavelength division multiplexing unit 3, the signal light is output from the common end of the wavelength division multiplexing unit 3, enters one end of the light reflection unit 5 through the transmission optical fiber 4, and is then output from the other end of the light reflection unit 5; the flow direction of the monitoring light is: the monitoring light is output by the optical time domain reflectometer unit 1 and then enters the optical switch unit 2, and then is output from the optical switch unit 2 to the reflection end of the corresponding wavelength division multiplexing unit 3, and then the monitoring light is output from the common end of the wavelength division multiplexing unit 3 and enters the transmission optical fiber 4, at this time, due to the scattering effect of the transmission optical fiber 4, a part of the monitoring light is continuously transmitted along the transmission optical fiber 4 in the forward direction, the other part of the monitoring light is transmitted in the backward direction after being scattered by the transmission optical fiber 4, the monitoring light transmitted along the forward direction of the transmission optical fiber 4 reaches the optical reflection unit 5 and then is reflected and can not pass through, thereby avoiding the monitoring light from influencing the optical receiver at the receiving end, after the monitoring light transmitted in the backward direction along the transmission optical fiber 4 is input through the common end of the wavelength division multiplexing unit 3, the monitoring light is output from the reflection end of the wavelength, therefore, the monitoring light output to the transmission end through the common end of the wavelength division multiplexing unit 3 can be ignored, so that the influence of the monitoring light on the light source of the transmitting end is avoided, the monitoring light output from the reflection end of the wavelength division multiplexing unit 3 returns to the optical time domain reflectometer unit 1 through the optical switch unit 2, and the on-line monitoring of the optical cable is realized.
When the signal light and the monitoring light are transmitted in reverse in the transmission fiber 4, the flow direction of the signal light is: the signal light is input from the light reflection unit 5, transmitted to the common end of the wavelength division multiplexing unit 3 through the transmission optical fiber 4, and then transmitted from the common end of the wavelength division multiplexing unit 3 to the transmission end for output; the flow direction of the monitoring light is: the monitoring light is output by the optical time domain reflectometer unit 1 and then enters the optical switch unit 2, and then is output from the optical switch unit 2 to the reflection end of the corresponding wavelength division multiplexing unit 3, and then the monitoring light is output from the common end of the wavelength division multiplexing unit 3 and enters the transmission optical fiber 4, at this time, due to the scattering effect of the transmission optical fiber 4, a part of the monitoring light is continuously transmitted along the transmission optical fiber 4 in the forward direction, the other part of the monitoring light is transmitted in the backward direction after being scattered by the transmission optical fiber 4, the monitoring light transmitted along the forward direction of the transmission optical fiber 4 reaches the optical reflection unit 5 and then is reflected and can not pass through, thereby avoiding the monitoring light from influencing the light source of the transmitting end, after the monitoring light transmitted in the backward direction along the transmission optical fiber 4 is input from the common end of the wavelength division multiplexing unit 3, the monitoring light is output from the reflection end of, therefore, the monitoring light output to the transmission end through the common end of the wavelength division multiplexing unit 3 can be ignored, thereby avoiding the monitoring light from influencing the optical receiver at the receiving end; the monitoring light output from the reflection end of the wavelength division multiplexing unit 3 returns to the optical time domain reflectometer unit 1 through the optical switch unit 2.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. An on-line optical cable monitoring system is characterized by comprising an optical time domain reflectometer unit (1), an optical switch unit (2) and a plurality of monitoring modules;
one end of the optical time domain reflectometer unit (1) is used for accessing or outputting monitoring light, and the other end of the optical time domain reflectometer unit is connected with the optical switch unit (2);
each monitoring module comprises a wavelength division multiplexing unit (3), a transmission optical fiber (4) and a light reflection unit (5); the transmission end of the wavelength division multiplexing unit (3) is used for inputting or outputting signal light, the reflection end is connected with one port of the optical switch unit (2), the public end is connected with one end of the transmission optical fiber (4), the transmission end of the wavelength division multiplexing unit (3) prevents the monitoring light from emitting, and the reflection end prevents the signal light from emitting; the other end of the transmission optical fiber (4) is connected with one end of the light reflection unit (5); the other end of the light reflection unit (5) is used for inputting or outputting signal light, and the light reflection unit (5) reflects monitoring light;
when the signal light and the monitoring light are transmitted in the same direction in the transmission optical fiber (4), the signal light is output from the common end of the wavelength division multiplexing unit (3) after being input from the transmission end of the wavelength division multiplexing unit (3), enters one end of the light reflection unit (5) through the transmission optical fiber (4), and is then output from the other end of the light reflection unit (5); the monitoring light enters the optical switch unit (2) after being output by the optical time domain reflectometer unit (1), and is output to the reflection end of the corresponding wavelength division multiplexing unit (3) from the optical switch unit (2), then the monitoring light is output from the public end of the wavelength division multiplexing unit (3) and enters the transmission optical fiber (4), one part of the monitoring light is continuously transmitted along the transmission optical fiber (4) in the forward direction, the other part of the monitoring light is transmitted in the backward direction after being scattered by the transmission optical fiber (4), the monitoring light transmitted along the forward direction of the transmission optical fiber (4) reaches the light reflection unit (5) and is reflected and can not pass through, the monitoring light transmitted in the backward direction along the transmission optical fiber (4) is input through the public end of the wavelength division multiplexing unit (3), monitoring light output from the reflection end of the wavelength division multiplexing unit (3) and output from the reflection end of the wavelength division multiplexing unit (3) returns to the optical time domain reflectometer unit (1) through the optical switch unit (2).
2. An on-line cable monitoring system according to claim 1, wherein: when the signal light and the monitoring light are reversely transmitted in the transmission optical fiber (4), the signal light is input from the light reflection unit (5), transmitted to the common end of the wavelength division multiplexing unit (3) through the transmission optical fiber (4), and then transmitted to the transmission end from the common end of the wavelength division multiplexing unit (3) for output; the monitoring light enters the optical switch unit (2) after being output by the optical time domain reflectometer unit (1), and is output to the reflection end of the corresponding wavelength division multiplexing unit (3) from the optical switch unit (2), then the monitoring light is output from the public end of the wavelength division multiplexing unit (3) and enters the transmission optical fiber (4), one part of the monitoring light is continuously transmitted along the transmission optical fiber (4) in the forward direction, the other part of the monitoring light is transmitted in the backward direction after being scattered by the transmission optical fiber (4), the monitoring light transmitted along the forward direction of the transmission optical fiber (4) reaches the light reflection unit (5) and is reflected and can not pass through, the monitoring light transmitted in the backward direction along the transmission optical fiber (4) is input through the public end of the wavelength division multiplexing unit (3), monitoring light output from the reflection end of the wavelength division multiplexing unit (3) and output from the reflection end of the wavelength division multiplexing unit (3) returns to the optical time domain reflectometer unit (1) through the optical switch unit (2).
3. An on-line cable monitoring system according to claim 1, wherein: the isolation of the transmission end of the wavelength division multiplexing unit (3) to the monitoring light is larger than 30dB, and the isolation of the reflection end to the signal light is larger than 30 dB.
4. An on-line cable monitoring system according to claim 1, wherein: the on-line optical cable monitoring system further comprises a monitoring light emitting unit, the wavelength range of monitoring light emitted by the monitoring light emitting unit is 1625-1650 nm, and the dynamic range is smaller than or equal to 40 dB.
5. An on-line cable monitoring system according to claim 1, wherein: the on-line optical cable monitoring system further comprises a signal light emitting unit, the wavelength range of the signal light emitted by the signal light emitting unit is 1525-1565 nm, and the optical power is less than 4 dB.
6. An on-line cable monitoring system according to claim 1, wherein: the optical switch unit (2) comprises an input port and 48 output ports, the input port is connected with the optical time domain reflectometer unit (1), and each output port is respectively connected with the wavelength division multiplexing unit (3) in the corresponding monitoring module.
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| CN202021980494.1U CN211791516U (en) | 2020-09-11 | 2020-09-11 | On-line optical cable monitoring system |
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| CN202021980494.1U CN211791516U (en) | 2020-09-11 | 2020-09-11 | On-line optical cable monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112713931A (en) * | 2021-01-27 | 2021-04-27 | 武汉光迅科技股份有限公司 | OTDR equipment, optical time domain reflection detection method and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112713931A (en) * | 2021-01-27 | 2021-04-27 | 武汉光迅科技股份有限公司 | OTDR equipment, optical time domain reflection detection method and storage medium |
| CN112713931B (en) * | 2021-01-27 | 2022-03-11 | 武汉光迅科技股份有限公司 | OTDR equipment, optical time domain reflection detection method and storage medium |
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