CN220798281U - Automatic measuring device for optical fiber link - Google Patents
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- CN220798281U CN220798281U CN202322626614.8U CN202322626614U CN220798281U CN 220798281 U CN220798281 U CN 220798281U CN 202322626614 U CN202322626614 U CN 202322626614U CN 220798281 U CN220798281 U CN 220798281U
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Abstract
The utility model provides an automatic measuring device of an optical fiber link, which comprises: the optical path coupler is respectively connected with the first wavelength laser, the second wavelength laser, the first coupler and the filter, a first port of the first coupler is connected with the optical path coupler, a second port of the first coupler is connected with the first optical power detector, and a third port of the first coupler is connected with the first port of the optical switch; the signal path of the third port of the optical switch is switched between the first port and the second port; the second port of the second coupler is connected with the output port of the third wavelength laser, the third port is connected with the second optical power detector, and the fourth port is connected with the output port of the device; and the controller is used for controlling all devices in the device. The automatic measuring device for the optical fiber link can automatically switch the wavelength according to the test result to perform corresponding test, and reduces the manual participation in the operation process.
Description
Technical Field
The utility model relates to the technical field of optical fiber testing, in particular to an automatic measuring device for an optical fiber link.
Background
With the continuous development of FTTH/FTTR (fiber to the home), the amount of fiber deployment and maintenance engineering is increasing, and OTDR (optical time domain reflectometer) has been widely used as an essential tool for fiber deployment and maintenance. The use of OTDR needs to carry out specialized training to operating personnel, and requires operating personnel to possess certain light measurement basis to restricted operating personnel's threshold, increased the difficulty of optic fibre deployment and maintenance.
How to provide a device capable of automatically measuring an optical fiber link, reducing human intervention and lowering the threshold of OTDR (optical time domain reflectometer) is a problem to be solved at present.
Disclosure of utility model
The utility model provides an automatic measuring device for an optical fiber link, which solves the problem of high manual intervention degree in the OTDR operation process in the prior art.
The technical scheme of the utility model is realized as follows:
An automatic measurement device for an optical fiber link, comprising:
The first wavelength laser 11, the second wavelength laser 12 and the third wavelength laser 13 are respectively used for outputting three optical signals with different wavelengths;
The optical path coupler 100 is connected to the first wavelength laser 11, the second wavelength laser 12, the first coupler 41, and the filter 71, respectively, and the coupling relationship of the optical path coupler 100 is: the first wavelength laser 11 optical signal is coupled to the first coupler 41, the second wavelength laser 12 optical signal is coupled to the first coupler 41, and the first coupler 41 optical signal is coupled to the filter 71 through the optical path coupler 100;
the first port of the first coupler 41 is connected with the optical path coupler 100, the second port is connected with the first optical power detector 51, and the third port is connected with the first port of the optical switch 81; the coupling relationship of the first coupler 41 is: the first port optical signal is coupled to the third port, the third port optical signal is coupled to the first port and the second port;
the first port of the filter 71 is connected to the optical coupler 100, the second port is connected to the second port of the optical switch 81, the third port is connected to the photodetector 61, and the filter 71 is configured to transmit the optical signal of the third wavelength and reflect the first wavelength optical signal and the second wavelength optical signal;
The third port of the optical switch 81 is connected with the first port of the second coupler 42, and the signal path of the third port of the optical switch 81 is switched between the first port and the second port;
The second port of the second coupler 42 is connected with the output port of the third wavelength laser 13, the third port is connected with the second optical power detector 52, the fourth port is connected with the output port of the device, and the output port of the device is used for connecting the tested optical fiber link; the coupling relationship of the second coupler 42 is: a fourth port optical signal is coupled to the first port, and a second port optical signal is coupled to the third port and the fourth port;
and the controller is used for controlling all devices in the device.
Alternatively, the split ratio of the first coupler 41 is: the first port accounts for 95%, the second port accounts for 5%, and the third port accounts for 95%.
Optionally, the optical path coupler 100 includes a first circulator 21, a second circulator 22, a first wavelength division multiplexer 31, and a second wavelength division multiplexer 32;
the first wavelength laser 11 is connected to a first port of the first circulator 21, a second port of the first circulator 21 is connected to a first port of the first wavelength division multiplexer 31, and a third port of the first circulator 21 is connected to a first port of the second wavelength division multiplexer 32;
The second wavelength laser 12 is connected to the first port of the second circulator 22, the second port of the second circulator 22 is connected to the second port of the first wavelength division multiplexer 31, and the third port thereof is connected to the second port of the second wavelength division multiplexer 32;
The third port of the first wavelength division multiplexer 31 is connected to the first port of the first coupler 41 and the third port of the second wavelength division multiplexer 32 is connected to the first port of the filter 71.
Optionally, the optical path coupler 100 includes a third wavelength division multiplexer 33 and a third coupler 43;
The first port and the second port of the third wavelength division multiplexer 33 are respectively connected with the first wavelength laser 11 and the second wavelength laser 12, the third port of the third wavelength division multiplexer 33 is connected with the first port of the third coupler 43, the second port of the third coupler 43 is connected with the first port of the filter 71, and the third port of the third coupler 43 is connected with the first port of the first coupler 41;
The third coupler coupling relationship is: the first port optical signal is coupled to the third port and the third port optical signal is coupled to the second port.
Optionally, the first optical power detector 51 is a demultiplexer, and divides the injected optical signal to be measured into an uplink optical signal and a downlink optical signal.
Optionally, the second optical power detector 52 is a demultiplexer, and divides the injected optical signal to be measured into an uplink optical signal and a downlink optical signal.
Optionally, the photodetector 61 is an avalanche photodetector.
Optionally, the first wavelength laser 11 is a 1310nm laser.
Optionally, the second wavelength laser 12 is a 1550nm laser.
Optionally, the third wavelength laser 13 is a 1650nm laser.
The beneficial effects of the utility model are as follows:
(1) The device can automatically switch the wavelength to perform corresponding test according to the test result without setting any parameter;
(2) The manual participation degree in the operation process is reduced, the operation can be performed without professional training, the deployment time is shortened, and the test efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment 1 of an automatic optical fiber link measurement device according to the present utility model;
FIG. 2 is a schematic diagram of an embodiment 2 of an automatic optical fiber link measurement device according to the present utility model;
fig. 3 is a schematic diagram of an embodiment 3 of an optical fiber link automatic measurement device according to the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, this embodiment discloses an automatic measurement device for an optical fiber link, including: the first wavelength laser 11, the second wavelength laser 12 and the third wavelength laser 13 are respectively used for outputting three optical signals with different wavelengths, the first wavelength optical signal output by the first wavelength laser 11 and the second wavelength optical signal output by the second wavelength laser 12 are used for measuring parameters such as loss, length, macrobend and the like of a non-service optical fiber link, generally the first wavelength is consistent with the wavelength of a service uplink optical signal, the second wavelength is consistent with the wavelength of a service downlink optical signal, and because the first wavelength and the second wavelength collide with service light, only the non-service optical fiber link can be measured, and the real loss of the uplink optical signal and the downlink optical signal can be reflected through the test results of the first wavelength and the second wavelength; and because the first wavelength and the second wavelength have different sensitivity to the bending of the optical fiber, whether a macrobending event exists can be judged by testing the first wavelength and the second wavelength simultaneously; the third wavelength optical signal output by the third wavelength laser 13 is typically selected to be in a different wavelength band than the wavelength of the service optical fiber for testing the service optical fiber link. One skilled in the art can select the lasers of the corresponding wavelengths according to design requirements.
The optical path coupler 100 is connected to the first wavelength laser 11, the second wavelength laser 12, the first coupler 41, and the filter 71, respectively, and the coupling relationship of the optical path coupler 100 is: the first wavelength laser 11 optical signal is coupled to the first coupler 41, the second wavelength laser 12 optical signal is coupled to the first coupler 41, and the first coupler 41 optical signal is coupled to the filter 71 through the optical path coupler.
The first coupler 41 has a first port connected to the optical path coupler 100, a second port connected to the first optical power detector (OPM) 51, and a third port connected to the first port of the optical switch 81. The coupling relationship of the first coupler 41 is: the first port optical signal is coupled to the third port, which is coupled to the first port and the second port, i.e. the first coupler 41 first port and the second port are on the same side and the third port is on the other side. As an alternative embodiment, the split ratio of the first coupler 41 is set as: the first port accounts for 95%, the second port accounts for 5%, and the third port accounts for 95%. Of course, the above-mentioned setting of the splitting ratio of the first coupler is merely illustrative, and the splitting ratio of the first coupler may be set to other ratio values.
The filter 71 has a first port connected to the optical coupler 100, a second port connected to the optical switch 81, and a third port connected to the photodetector (APD) 61. The filter 71 can transmit the optical signal of the third wavelength and reflect the optical signals of the first wavelength and the second wavelength, and the filter 71 filters the service light in the optical fiber link, so that only the measured light of the third wavelength is reserved, and the measurement or real-time monitoring of the service optical fiber link is realized under the condition of no service interruption. Optionally, the filter 71 is a bandpass fiber filter. The filter 71 is configured to filter out the traffic light signals, and for the present embodiment, the first wavelength light signal and the second wavelength light signal are filtered out, and the third wavelength light signal can pass through.
The third port of the optical switch 81 is connected to the first port of the second coupler 42, and the signal path of the third port of the optical switch 81 is switched between the first port and the second port.
The first port of the second coupler 42 is connected to the third port of the optical switch 81, the second port is connected to the output port of the third wavelength laser 13, the third port is connected to the second optical power detector (OPM) 52, and the fourth port is connected to the output port of the device, which is used to connect to the tested optical fiber link. The coupling relationship of the second coupler 42 is: the fourth port optical signal is coupled to the first port and the second port optical signal is coupled to the third port and the fourth port, i.e. the second coupler first port and second port are on the same side and the third port and fourth port are on the other side.
The first optical power detector 51 is used for measuring the optical signal power of the optical fiber link under test and the second optical power detector 52 is used for providing an optical output power reference. Since the optical fiber link automatic measuring device of the present utility model can provide a stable light source function, the second optical power detector 52 is added to monitor the output power of the first wavelength laser, the second wavelength laser, and the third wavelength laser in order to stabilize the output power of the light source through power feedback. Optionally, the first optical power detector (OPM) 51 and the second optical power detector (OPM) 52 are a split-wave detector, i.e. a built-in filter, to split the injected optical signal under test into an upstream optical signal and a downstream optical signal. Optionally, photodetector (APD) 61 is an APD avalanche photodetector.
The automatic measuring device of the optical fiber link also comprises a controller for controlling each device in the device. The controller of the utility model does not relate to improvement of a control program, and the control of each device is realized by adopting the existing program.
The test flow of the automatic measuring device for the optical fiber link is as follows:
After the test is started, the controller controls the optical switch 81 to connect the first port with the third port, so that an optical signal in the tested optical fiber link enters the first port from the fourth port of the second coupler 42 through the device output port, then enters the first port through the third port of the optical switch 81, then enters the second port through the third port of the first coupler 41, and then enters the first optical power detector 51 for detection.
When the first optical power detector 51 detects that the optical power value in the tested optical fiber link is smaller than the threshold value, the tested optical fiber link has no service optical signal, the controller controls the first wavelength laser 11 and the second wavelength laser 12 to output optical signals, and selects optical signals with different wavelengths to perform dual-wavelength test on the tested optical fiber link, such as link length, loss, macrobend, optical return loss and the like.
When the first optical power detector (OPM) 51 detects that the optical power value in the tested optical fiber link is greater than or equal to the threshold, the tested optical fiber link has a service optical signal, and at this time, to protect the optical device from being damaged by the service optical signal, the controller switches the third port of the optical switch 81 to the second port, the controller controls the third wavelength laser 13 to output a pulse optical signal to test the tested optical fiber link, the pulse optical signal emitted by the third wavelength laser 13 is injected into the tested optical link through the second port, the fourth port and the device output end of the second coupler, and a scattered or reflected signal in the tested optical link enters the first port through the fourth port of the second coupler 42, then enters the second port through the third port of the optical switch 81, and then enters the photoelectric detector (APD) 61 through the second port and the third port of the filter 71, so as to implement measurement of the length and loss distribution of the service optical fiber link.
In the present utility model, the limitation of each port of the device, for example, the first port, the second port, the third port, the fourth port, etc. is only to distinguish each port, and is not limited to a specific pin.
Example 2
As shown in fig. 2, in the present embodiment, the optical path coupler 100 includes a first circulator 21, a second circulator 22, a first Wavelength Division Multiplexer (WDM) 31, and a second Wavelength Division Multiplexer (WDM) 32.
Wherein, the output port of the first wavelength laser 11 is connected to the first port of the first circulator 21, the second port of the first circulator 21 is connected to the first port of the first Wavelength Division Multiplexer (WDM) 31, and the third port of the first circulator 21 is connected to the first port of the second Wavelength Division Multiplexer (WDM) 32.
The output port of the second wavelength laser 12 is connected to a first port of the second circulator 22, a second port of the second circulator 22 is connected to a second port of the first Wavelength Division Multiplexer (WDM) 31, and a third port thereof is connected to a second port of the second Wavelength Division Multiplexer (WDM) 32.
The third port of the first Wavelength Division Multiplexer (WDM) 31 is connected to the first port of the first coupler 41 and the third port of the second Wavelength Division Multiplexer (WDM) 32 is connected to the first port of the filter 71.
The circulator is a wavelength dependent device, and thus the first circulator 21 is a circulator corresponding to the first wavelength laser 11, the optical signal injected at the first port of which can only come out of the second port, and the optical signal injected at the second port can only come out of the third port; similarly, the second circulator 22 is a circulator corresponding to the second wavelength, and the optical signal injected from the first port can only come out from the second port, and the optical signal injected from the second port can only come out from the third port.
The function of the wavelength division multiplexer is to couple the optical signals output by the first wavelength laser and the optical signals output by the second wavelength laser to one optical fiber, for example, the first wavelength division multiplexer 31 couples the first wavelength laser optical signal injected by the first port and the second wavelength laser optical signal injected by the second port to the third port output.
Optical signal coupling is achieved through cooperation between the first circulator, the second circulator, the first Wavelength Division Multiplexer (WDM) 31, the second Wavelength Division Multiplexer (WDM) 32 to accomplish different tests such as link length, loss, macrobend, optical return loss, etc. For example, when the first wavelength laser 11 is controlled to emit an optical pulse, the optical pulse enters the second port through the first port of the first circulator, then enters the third port through the first port of the first wavelength division multiplexer 31, and is output, and the output optical pulse is injected into the tested optical fiber link through the subsequent optical path; scattered or reflected signals in the optical fiber link under test enter the first port via the third port of the first wavelength division multiplexer, then enter the third port via the second port of the first circulator, enter the third port via the first port of the second wavelength division multiplexer, then enter the third port via the first port of the filter, and are received by the photodetector 61.
Example 3
As shown in fig. 3, in the present embodiment, the optical path coupler 100 includes a third wavelength division multiplexer 33 and a third coupler 43; the first port and the second port of the third wavelength division multiplexer 33 are respectively connected with the first wavelength laser 11 and the second wavelength laser 12, the third port of the third wavelength division multiplexer 33 is connected with the first port of the third coupler 43, the second port of the third coupler 43 is connected with the first port of the filter 71, and the third port of the third coupler 43 is connected with the first port of the first coupler 41. The third coupler 43 has the coupling relationship: the first port optical signal is coupled to the third port and the third port optical signal is coupled to the second port.
For example, when the first wavelength laser 11 is controlled to emit an optical pulse, the optical pulse enters the third port through the first port of the third wavelength division multiplexer 33, then enters the third port through the first port of the third coupler 43, and is output, and the output optical pulse is injected into the tested optical fiber link through a subsequent optical path; scattered or reflected signals in the fiber optic link under test are received by the photodetector 61 via subsequent optical paths from the third port of the third coupler 43 to the second port and then via the first port of the filter 71 to the third port.
Example 4
In this embodiment, the first wavelength laser 11 is a 1310nm laser for outputting a 1310nm wavelength optical signal, the second wavelength laser 12 is a 1550nm laser for outputting a 1550nm wavelength optical signal, and the third wavelength laser 13 is a 1650nm laser for outputting a 1650nm wavelength optical signal.
Of course, the above lasers are merely exemplary, and one skilled in the art may select a laser of a corresponding wavelength according to design requirements.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. An automatic measurement device for an optical fiber link, comprising:
The first wavelength laser (11), the second wavelength laser (12) and the third wavelength laser (13) are respectively used for outputting three optical signals with different wavelengths;
An optical path coupler (100) which is connected to the first wavelength laser (11), the second wavelength laser (12), the first coupler (41) and the filter (71), wherein the coupling relationship of the optical path coupler (100) is as follows: the first wavelength laser (11) optical signal is coupled to the first coupler (41), the second wavelength laser (12) optical signal is coupled to the first coupler (41), and the first coupler (41) optical signal is coupled to the filter (71) through the optical path coupler (100);
The first port of the first coupler (41) is connected with the optical path coupler (100), the second port is connected with the first optical power detector (51), and the third port is connected with the first port of the optical switch (81); the coupling relation of the first coupler (41) is: the first port optical signal is coupled to the third port, the third port optical signal is coupled to the first port and the second port;
The first port of the filter (71) is connected with the optical path coupler (100), the second port of the filter is connected with the second port of the optical switch (81), the third port of the filter is connected with the photoelectric detector (61), and the filter (71) is used for transmitting optical signals of a third wavelength and reflecting the optical signals of the first wavelength and the second wavelength;
a third port of the optical switch (81) is connected with a first port of the second coupler (42), and a signal path of the third port of the optical switch (81) is switched between the first port and the second port;
The second port of the second coupler (42) is connected with the output port of the third wavelength laser (13), the third port is connected with the second optical power detector (52), the fourth port is connected with the output port of the device, and the output port of the device is used for being connected with the tested optical fiber link; the coupling relation of the second coupler (42) is: a fourth port optical signal is coupled to the first port, and a second port optical signal is coupled to the third port and the fourth port;
and the controller is used for controlling all devices in the device.
2. An automatic measuring device for optical fiber links according to claim 1, characterized in that,
The spectral ratio of the first coupler (41) is: the first port accounts for 95%, the second port accounts for 5%, and the third port accounts for 95%.
3. An automatic measuring device for optical fiber links according to claim 1, characterized in that,
The optical path coupler (100) comprises a first circulator (21), a second circulator (22), a first wavelength division multiplexer (31) and a second wavelength division multiplexer (32);
The first wavelength laser (11) is connected with a first port of the first circulator (21), a second port of the first circulator (21) is connected with a first port of the first wavelength division multiplexer (31), and a third port of the first circulator (21) is connected with a first port of the second wavelength division multiplexer (32);
The second wavelength laser (12) is connected with a first port of the second circulator (22), a second port of the second circulator (22) is connected with a second port of the first wavelength division multiplexer (31), and a third port of the second wavelength laser is connected with a second port of the second wavelength division multiplexer (32);
The third port of the first wavelength division multiplexer (31) is connected with the first port of the first coupler (41), and the third port of the second wavelength division multiplexer (32) is connected with the first port of the filter (71).
4. An automatic measuring device for optical fiber links according to claim 1, characterized in that,
The optical path coupler (100) comprises a third wavelength division multiplexer (33) and a third coupler (43);
The first port and the second port of the third wavelength division multiplexer (33) are respectively connected with the first wavelength laser (11) and the second wavelength laser (12), the third port of the third wavelength division multiplexer (33) is connected with the first port of the third coupler (43), the second port of the third coupler (43) is connected with the first port of the filter (71), and the third port of the third coupler (43) is connected with the first port of the first coupler (41);
The third coupler coupling relationship is: the first port optical signal is coupled to the third port and the third port optical signal is coupled to the second port.
5. An automatic measuring device for optical fiber links according to claim 1, characterized in that,
The first optical power detector (51) is a demultiplexer detector, and divides the injected optical signal to be measured into an uplink optical signal and a downlink optical signal.
6. An automatic measuring device for optical fiber links according to claim 1, characterized in that,
The second optical power detector (52) is a demultiplexer detector, and divides the injected optical signal to be measured into an uplink optical signal and a downlink optical signal.
7. An automatic measuring device for optical fiber links according to claim 1, characterized in that,
The photodetector (61) is an avalanche photodetector.
8. An automatic measuring device for optical fiber links according to claim 1, characterized in that,
The first wavelength laser (11) is a 1310nm laser.
9. An automatic measuring device for optical fiber links according to claim 1, characterized in that,
The second wavelength laser (12) is a 1550nm laser.
10. An automatic measuring device for optical fiber links according to claim 1, characterized in that,
The third wavelength laser (13) is a 1650nm laser.
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| CN202322626614.8U CN220798281U (en) | 2023-09-27 | 2023-09-27 | Automatic measuring device for optical fiber link |
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