CN219536074U - Single-multimode integrated optical time domain reflectometer - Google Patents
Single-multimode integrated optical time domain reflectometer Download PDFInfo
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- CN219536074U CN219536074U CN202321011260.XU CN202321011260U CN219536074U CN 219536074 U CN219536074 U CN 219536074U CN 202321011260 U CN202321011260 U CN 202321011260U CN 219536074 U CN219536074 U CN 219536074U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The utility model discloses a single-mode and multi-mode integrated optical time domain reflectometer, which belongs to the technical field of optical fiber communication and comprises a single-mode optical fiber channel and a multi-mode optical fiber channel which are connected with a data processing unit, wherein the multi-mode optical fiber channel comprises a first 50:50 branching device connected with an optical fiber to be tested, two branches of the first 50:50 branching device are respectively connected with a first optical fiber wavelength division multiplexer and a multi-mode optical switch, the other two ports of the first optical fiber wavelength division multiplexer are respectively connected with a first pulse laser and a second pulse laser, the single-mode optical fiber channel comprises a second 50:50 branching device connected with the optical fiber to be tested, the two branches of the second 50:50 branching device are respectively connected with a second optical fiber wavelength division multiplexer and the multi-mode optical switch, the other port of the multi-mode optical switch is connected with a photoelectric detector, and the other two ports of the second optical fiber wavelength division multiplexer are respectively connected with a third pulse laser and a fourth pulse laser. The utility model simplifies the structure, reduces the cost and simplifies the debugging process.
Description
Technical Field
The utility model belongs to the technical field of optical fiber communication, and particularly relates to a single-multimode integrated optical time domain reflectometer.
Background
An optical time domain reflectometer (hereinafter "OTDR") can provide an internal view of the fiber and can calculate fiber length, attenuation values, break points, total return loss and fusion points, connection points, and total loss. The OTDR sends short pulses of light into the fiber. Light scattering occurs in the optical fiber due to interruption factors such as connectors, fusion points, bends, faults, etc. The OTDR will then detect and analyze the backscattered signal. The signal strength is measured for a particular time interval and used to represent event characteristics.
In reality, optical networks are classified into single-mode optical fiber networks and multimode optical fiber networks according to the types of optical fibers. The communication network is typically composed of a single mode fiber network, while the factory or large community is typically composed of a multimode fiber network. In the maintenance and repair process, the single-multi-body optical time domain reflectometer is required to be maintained.
In reality, the design of the single-multimode integrated optical time domain reflectometer is basically finished by double APDs, wherein the APDs are photodetectors, and a single-mode channel is finished by a single-mode APD and a control circuit thereof; the multimode channel is completed by the multimode APD and a control circuit thereof, and the double APDs enter the data processing unit for processing through the respective channels. In this way, although the function can be realized, the cost is too high and the debugging process is complex.
Therefore, in the field of optical fiber communication technology, there is still a need for research and improvement on optical time domain reflectometry, which is a research hotspot and an important point in the field of optical fiber communication technology at present, and is more a starting point for the completion of the present utility model.
Disclosure of Invention
Therefore, the technical problems to be solved by the utility model are as follows: the single-multimode integrated optical time domain reflectometer has the advantages of simplifying the structure, reducing the cost and simplifying the debugging process.
In order to solve the technical problems, the technical scheme of the utility model is as follows: the single-mode and multi-mode integrated optical time domain reflectometer comprises a single-mode fiber channel and a multi-mode fiber channel, wherein the multi-mode fiber channel comprises a first 50:50 branch connected with an optical fiber to be measured, two branches of the first 50:50 branch are respectively connected with a first optical fiber wavelength division multiplexer and a multi-mode optical switch, the other two ports of the first optical fiber wavelength division multiplexer are respectively connected with a first pulse laser and a second pulse laser, the single-mode fiber channel comprises a second 50:50 branch connected with the optical fiber to be measured, two branches of the second 50:50 branch are respectively connected with a second optical fiber wavelength division multiplexer and the multi-mode optical switch, the other two ports of the multi-mode optical switch are respectively connected with a photoelectric detector, the other two ports of the second optical fiber wavelength division multiplexer are respectively connected with a third pulse laser and a fourth pulse laser, and the first 50:50 branch, the first optical fiber wavelength division multiplexer, the first pulse laser, the second 50:50 branch, the second optical fiber wavelength division multiplexer, the third pulse multiplexer, the fourth pulse laser and a data processing unit are all connected with the photoelectric detector.
As an improvement, the first optical fiber wavelength division multiplexer and the second optical fiber wavelength division multiplexer are both optical fiber wavelength division multiplexers.
After the technical scheme is adopted, the utility model has the beneficial effects that:
according to the single-mode and multi-mode integrated optical time domain reflectometer provided by the utility model, the single-mode optical fiber channel and the multi-mode optical fiber channel are connected together through the multi-mode optical switch to form an integrated structure, and during testing, the multi-mode optical signal or the single-mode optical signal is connected to the multi-mode APD and the data processing unit, so that the multi-mode optical signal or the single-mode optical signal is tested, the structure is simple, the debugging is convenient, and the use is convenient.
In conclusion, the single-multimode integrated optical time domain reflectometer provided by the utility model realizes the physical characteristics of the optical fiber to be tested with light, simplifies the structure, reduces the cost and simplifies the debugging process.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present utility model, should fall within the scope of the utility model.
FIG. 1 is a block diagram of a single multimode integrated optical time domain reflectometer according to an embodiment of the present utility model;
in the figure: 10. multimode fiber channel, 101, first 50:50 splitter, 102, first fiber wavelength division multiplexer, 103, first pulse laser, 104, second pulse laser, 20, single mode fiber channel, 201, second 50:50 splitter, 202, second fiber wavelength division multiplexer, 203, third pulse laser, 204, fourth pulse laser, 30, multimode optical switch, 40, photodetector, 50, data processing unit.
Detailed Description
Other advantages and advantages of the present utility model will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, 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.
As shown in fig. 1, a single-multimode integrated optical time domain reflectometer includes a single-mode fiber channel 20 and a multimode fiber channel 10, the multimode fiber channel 10 includes a first 50:50 branch 101 connected to a measured optical fiber, two branches of the first 50:50 branch 101 are respectively connected to a first optical fiber wavelength division multiplexer 102 and a multimode optical switch 30, two other ports of the first optical fiber wavelength division multiplexer 102 are respectively connected to a first pulse laser 103 and a second pulse laser 104, the single-mode fiber channel 20 includes a second 50:50 branch 201 connected to the measured optical fiber, two branches of the second 50:50 branch 201 are respectively connected to a second optical fiber wavelength division multiplexer 202 and a multimode optical switch 30, another port of the multimode optical switch 30 is connected to a photoelectric detector 40, another two ports of the second optical fiber wavelength division multiplexer 202 are respectively connected to a third pulse laser 203 and a fourth pulse laser 204, and the first 50:50 branch 101, the first optical fiber wavelength division multiplexer 102, the first pulse laser 103, the second pulse laser 104, the second 50:50 branch 202, the second optical fiber wavelength division multiplexer 203, the third pulse laser 203 and the multimode optical switch 30 are respectively connected to a multimode data processing unit of the fourth pulse laser.
Since the transmission in multimode fibers is 850nm wavelength or 1300nm wavelength light, the 1310nm wavelength or 1550nm wavelength transmission in most single mode fibers is also the dominant wavelength of the present utility model.
In the single mode fiber channel 20 of the present utility model, the first 50: the 50 branching device selects 1310nm &1550nm single mode 50: the 50 branches, the first optical fiber wavelength division multiplexer 102 selects 1310nm &1550nm single-mode optical Wavelength Division Multiplexer (WDM), the first pulse laser 103 selects 1310nm pulse laser, and the second pulse laser 104 selects 1550nm pulse laser.
In the multimode fibre channel 10, the second 50:50 splitter 201 selects the 850nm &1300nm multimode 50:50 branches, a 850nm multi-mode optical Wavelength Division Multiplexer (WDM) is selected as the second optical wavelength division multiplexer 202, a 850nm pulse laser is selected as the third pulse laser 203, and a 1300nm pulse laser is selected as the fourth pulse laser 204.
The photodetector 40 is a multimode APD, and the data processing unit 50 is a control and receive signal processing unit.
The multimode optical switch 30 connects a multimode optical signal or a single-mode optical signal to the multimode APD and the data processing unit 50 by a switching characteristic.
The working principle is as follows:
in the Shan Duomo optical time domain reflectometer, the single mode fiber channel 20 and the multi-mode fiber channel 10 can only be selected when in operation, and cannot operate simultaneously.
When the 850nm wavelength and 1300nm wavelength tests are selected, the data processing unit 50 issues instructions to control the optical switch to select the multimode optical fiber channel 10, test and process the received data; the detection steps are as follows: the data processing unit 50 controls the optical switch to connect the APD detector to the multimode fibre channel 10; pulsed light is controlled to be emitted by the 850nm laser or the 1300 laser, and enters the multimode 50 through multimode WDM: the 50 branches are injected into the tested optical fiber, and the reflected light of the tested optical fiber passes through the multimode 50:50 branches and multimode optical switch 30 (data processing unit 50 controls multimode optical switch 30 to connect multimode 50:50 branches with APD when 850nm wavelength and 1300nm wavelength are selected) into APD, at the same time APD receives reflected light to make photoelectric conversion and submits data processing unit 50 to process data.
When 1310nm wavelength and 1550nm wavelength are selected for testing, the data processing unit 50 sends out instructions to control the optical switch to select the single-mode optical fiber channel 20, and receive data are tested and processed; the detection steps are as follows: the data processing unit 50 controls the optical switch to connect the APD detector to the single mode optical fiber channel 20; pulsed light is emitted by a 1310nm laser or a 1550 laser, pulsed light is emitted by a 1310nm laser or a 15500nm laser, and enters a single mode 50 through single mode WDM: the 50 branches are injected into the tested optical fiber, and the reflected light of the tested optical fiber passes through the single mode 50:50 branches and multimode optical switch 30 (data processing unit 50 controls multimode optical switch 30 to connect single mode 50:50 branches with APD when 1310nm wavelength and 1550nm wavelength are selected) into APD, at the same time APD receives reflected light to make photoelectric conversion and submits data processing unit 50 to process data.
While the utility model has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.
Claims (2)
1. The single-mode integrated optical time domain reflectometer is characterized by comprising a single-mode fiber channel and a multimode fiber channel, wherein the multimode fiber channel comprises a first 50:50 branch connected with an optical fiber to be measured, two branches of the first 50:50 branch are respectively connected with a first optical fiber wavelength division multiplexer and a multimode optical switch, the other two ports of the first optical fiber wavelength division multiplexer are respectively connected with a first pulse laser and a second pulse laser, the single-mode fiber channel comprises a second 50:50 branch connected with the optical fiber to be measured, the two branches of the second 50:50 branch are respectively connected with a second optical fiber wavelength division multiplexer and the multimode optical switch, the other two ports of the multimode optical switch are connected with a photoelectric detector, the other two ports of the second optical fiber wavelength division multiplexer are respectively connected with a third pulse laser and a fourth pulse laser, and the first 50:50 branch, the first optical fiber wavelength division multiplexer, the first pulse laser, the second 50:50 branch, the second optical fiber wavelength division multiplexer, the third pulse multiplexer and the multimode optical switch are all connected with a data processing unit.
2. The single multimode integrated optical time domain reflectometer of claim 1, wherein the first and second optical fiber wavelength division multiplexers are both optical fiber wavelength division multiplexers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321011260.XU CN219536074U (en) | 2023-04-24 | 2023-04-24 | Single-multimode integrated optical time domain reflectometer |
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| CN202321011260.XU CN219536074U (en) | 2023-04-24 | 2023-04-24 | Single-multimode integrated optical time domain reflectometer |
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| CN202321011260.XU Active CN219536074U (en) | 2023-04-24 | 2023-04-24 | Single-multimode integrated optical time domain reflectometer |
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