CN110366058B - ONU port test circuit, device and system - Google Patents
ONU port test circuit, device and system Download PDFInfo
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- CN110366058B CN110366058B CN201910566082.9A CN201910566082A CN110366058B CN 110366058 B CN110366058 B CN 110366058B CN 201910566082 A CN201910566082 A CN 201910566082A CN 110366058 B CN110366058 B CN 110366058B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0083—Testing; Monitoring
Abstract
The invention discloses an ONU port test circuit, a device, a system and a method, which comprises a first optical interface, a wavelength division multiplexer, a photoelectric conversion module, a signal amplification module, a laser driver, a laser generator and an optical attenuator, wherein the first optical interface is connected with the wavelength division multiplexer, and the wavelength division multiplexer is connected with the photoelectric conversion module, the signal amplification module, the laser driver, the laser generator and the optical attenuator in a loop. The ONU port test circuit, the ONU port test device, the ONU port test system and the ONU port test method can simultaneously complete the transmission and reception performance test of the ONU port, have simple structure and greatly save optical fiber resources.
Description
Technical Field
The invention relates to the field of communication, in particular to an ONU port test circuit, an ONU port test device and an ONU port test system.
Background
Nowadays, communication services are rapidly developed, and the requirement for broadband is continuously increased. A PON (passive optical network) is a lightweight technology in a communication network, and its broadband and efficient access characteristics become one of important means for each large operator to perform full-service operation, and has been generally regarded. In a PON network, performance of transmitting and receiving signals of an ONU device port at a client is particularly important, and nowadays, performance testing of the ONU device port is mainly divided into transmission performance testing and reception performance testing, and when the transmission performance testing is performed on the port, an attenuator and an oscilloscope need to be connected, a cpu module of the ONU device transmits a test optical signal carrying a PRBS code sequence, and the test optical signal is sent to the oscilloscope through the attenuator to complete clock recovery and data recovery, thereby achieving transmission performance testing of the port; when the receiving performance of the port is tested, an error code meter and an attenuator need to be connected, the error code meter sends a test optical signal carrying a PRBS code sequence to the port of the ONU equipment, and the test of the receiving performance of the port is completed after the test optical signal is self-tested by a CPU module of the ONU equipment; that is, nowadays, the transmission and reception performance test for the ONU device ports needs to be done by connecting different circuits and using different instruments.
Because the optical path design of the ONU device is a single-fiber bidirectional design, transmitting and receiving optical signals using different wavelengths (for example, transmitting an optical signal of 1310nm and receiving an optical signal of 1490 nm), in the same optical fiber, a loop back test cannot be performed on a port, that is, a rapid test on the transmission and reception performance of the port of the ONU device cannot be completed at the same time; at present, an optical oscillograph and an error code meter are needed to be used for testing the transmitting and receiving performances of the port of the ONU equipment respectively, the testing equipment is various, the testing topology is complex, and the method is not suitable for rapidly and conveniently judging the transmitting and receiving performances of the port of the ONU equipment in the actual environment by research personnel and testing personnel.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a test circuit, an apparatus and a system capable of simultaneously measuring the transmitting and receiving performance of an ONU port and having a simple test topology.
In order to achieve the above object, an embodiment of the present invention provides an ONU port testing circuit, which includes a first optical interface, a wavelength division multiplexer, a photoelectric conversion module, a signal amplification module, a laser driver, a laser generator, and an optical attenuator.
And the optical communication end of the first optical interface is connected with the optical communication end of the wavelength division multiplexer, and is used for sending the received first optical signal with the preset first wavelength, which is sent by the external ONU equipment, to the wavelength division multiplexer.
And the optical signal sending end of the wavelength division multiplexer is connected with the receiving end of the photoelectric conversion module and is used for sending the received first optical signal to the photoelectric conversion module.
And the transmitting end of the photoelectric conversion module is connected with the receiving end of the signal amplification and power detection module and is used for converting the received first optical signal into an electric signal.
And the sending end of the signal amplification module is connected with the receiving end of the laser driver and is used for amplifying the electric signal and sending the electric signal to the laser driver.
And the sending end of the laser driver is connected with the receiving end of the laser generator and is used for converting the amplified electric signal into a driving signal and sending the driving signal to the laser generator.
And the transmitting end of the laser generator is connected with the receiving end of the optical attenuator and is used for generating a second optical signal with a preset second wavelength according to the driving signal and generating the second optical signal to the optical attenuator.
And the transmitting end of the optical attenuator is connected with the optical signal receiving end of the wavelength division multiplexer, and is used for attenuating the second optical signal to a preset degree and transmitting the attenuated second optical signal to the wavelength division multiplexer.
The wavelength division multiplexer is further configured to send the attenuated second optical signal to the first optical interface.
The first optical interface is further configured to send the received attenuated second optical signal to the ONU device, so that the ONU device detects at least one of the following parameters according to the sent first optical signal and the attenuated second optical signal: the optical receiving sensitivity of the ONU equipment and the signal quality of optical emission and reception.
As an improvement of the above scheme, the ONU port test circuit further includes an analog-to-digital conversion module, and a detection end of the analog-to-digital conversion module is connected to a sending end of the photoelectric conversion module, and is configured to measure the transmission power of the self-detection optical signal of the external ONU device according to the electrical signal sent by the photoelectric conversion module.
As an improvement of the above scheme, the photoelectric conversion module includes a photodiode for converting the received first optical signal into an electrical signal, and the photodiode is connected between an optical signal transmitting end of the wavelength division multiplexer and a receiving end of the signal amplification module.
As an improvement of the above scheme, the signal amplification module includes a limiting amplifier for amplifying the electrical signal sent by the photoelectric conversion module into a differential voltage signal, and the limiting amplifier is connected between the photoelectric conversion module and the laser driver.
As a modification of the above, the first wavelength is 1310nm, and the second wavelength is 1490 nm.
As an improvement of the above scheme, the first optical signal sent by the ONU device carries a PRBS code sequence, and the second optical signal returned to the ONU device by the first optical signal passing through the ONU port test circuit also carries a PRBS code sequence, so that the ONU device detects the signal quality of light emission and reception of the ONU device according to the PRBS code sequence of the first optical signal sent out and the PRBS code sequence of the second optical signal returned.
Another embodiment of the present invention provides an ONU port testing apparatus, which includes the ONU port testing circuit described above.
Another embodiment of the present invention provides an ONU port testing system, which includes an ONU device and the ONU port testing apparatus described above; the ONU equipment is connected with the first optical interface through an optical fiber;
the ONU device is configured to send a first optical signal to the ONU port testing apparatus, receive an attenuated second optical signal returned by the ONU port testing apparatus, and detect at least one of the following parameters according to the sent first optical signal and the attenuated second optical signal: the optical receiving sensitivity of the ONU equipment and the signal quality of optical emission and reception.
As an improvement of the above scheme, the ONU device includes a processor, an optical module, and a second optical interface; the processor is connected with the second optical interface through the optical module, and the second optical interface is connected with the first optical interface through an optical fiber.
The processor is used for controlling the optical module to generate a first optical signal with a preset first wavelength.
The optical module is configured to send the generated first optical signal to the second optical interface.
The second optical interface is configured to send the first optical signal to the first optical interface, and send the attenuated second optical signal sent by the first optical interface to the optical module.
And the optical module is also used for converting the attenuated second optical signal into a corresponding electric signal to be detected and sending the electric signal to the processor.
The processor is further configured to detect at least one of the following parameters based on the electrical signal to be detected: the optical receiving sensitivity of the ONU equipment and the signal quality of optical emission and reception.
The ONU port test circuit, the ONU port test device and the ONU port test system provided by the invention combine two optical carrier signals with different wavelengths and carrying check information together by adding a wavelength division multiplexer, are coupled into the same optical fiber of an optical line, are transmitted by a transmission structure of a loop, and are further processed and checked by a processor of ONU equipment. The whole process utilizes spontaneous emission, conversion and self-receiving to quickly finish the self-checking test of the emission and receiving performance parameters of the ONU port without the help of test instruments such as an optical oscillograph, an error code meter and the like, the test topological structure is simple, the test cost is lower, the test efficiency is greatly improved, and the optical fiber resources are saved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ONU port testing circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an ONU port testing system according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of an ONU port testing method according to an embodiment of the present invention;
reference is made to the accompanying drawings;
1. a first optical interface; 2. a wavelength division multiplexer; 3. a photoelectric conversion module; 4. a signal amplification module; 5. a laser driver; 6. a laser generator; 7. an optical attenuator; 8. an analog-to-digital conversion module; 9. a processor; 10. an optical module; 11. a second optical interface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In describing embodiments of the present invention, it should be noted that the invention may be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In addition, the invention is operational with numerous general purpose or special purpose computing device environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multi-processor apparatus, distributed computing environments that include any of the above devices or equipment, and the like.
In the description of the embodiments of the present invention, it is to be understood that the terms "first," "second," and "third" are used merely to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any actual such relationship or order or relative importance between such entities or operations.
An embodiment of the present invention provides an ONU port testing circuit, please refer to fig. 1, which is a schematic structural diagram of the ONU port testing circuit, and specifically includes a first optical interface 1, a wavelength division multiplexer 2, a photoelectric conversion module 3, a signal amplification module 4, a laser driver 5, a laser generator 6, and an optical attenuator 7.
In the embodiment of the present invention, an optical communication end of the first optical interface 1 in the ONU port test circuit is connected to an optical communication end of the wavelength division multiplexer 2, and is configured to send a received first optical signal with a preset first wavelength, which is sent by an external ONU device, to the wavelength division multiplexer; it should be noted that both the first optical interface 1 and the second optical interface 11 may be flanges of optical fiber connectors of ST, SC, or FC, and are determined by specific ONU devices; the wavelength division multiplexer 2 has an optical signal transmitting end connected to the receiving end of the optical-to-electrical conversion module 3, and is configured to transmit the received first optical signal to the optical-to-electrical conversion module 3, where the wavelength division multiplexer is a high-isolation wavelength division multiplexer and has a high data optical communication rate; the photoelectric conversion module 3 is configured to convert the received first optical signal into an electrical signal, a transmitting end of the photoelectric conversion module is connected to a receiving end of the signal amplification module 4, and the photoelectric conversion module is connected to the signal amplification module by using a serializer and a deserializer which include correlation; the transmitting end of the signal amplification module 4 is connected with the receiving end of the laser driver 5, and is used for amplifying the electric signal and transmitting the electric signal to the laser driver 5; the laser driver 5 is configured to convert the amplified electrical signal into a driving signal and send the driving signal to the laser generator 6, and a sending end of the laser driver is connected to a receiving end of the laser generator 6; the transmitting end of the laser generator 6 is connected with the receiving end of the optical attenuator 7, and is configured to generate a second optical signal with a preset second wavelength according to the driving signal and generate the second optical signal to the optical attenuator 7; through the laser driver and the laser generator, optical signals with corresponding wavelengths can be regenerated so as to be received and verified by subsequent ONU equipment, and a related photoelectric coupling circuit can be added, so that the transmission of the signals is not distorted, and the transmission efficiency is improved; the optical attenuator 7 is configured to attenuate the second optical signal to a predetermined degree and send the attenuated second optical signal to the wavelength division multiplexer 2, and a sending end of the optical attenuator is connected to an optical signal receiving end of the wavelength division multiplexer 2, so that the entire circuit is in a loop structure; the wavelength division multiplexer 2 sends the attenuated second optical signal back to the first optical interface 1 by branching and combining different optical signals; the first optical interface 1 is further configured to send the received attenuated second optical signal to the ONU device, so that the ONU device detects at least one of the following parameters according to the sent first optical signal and the attenuated second optical signal: and the optical receiving sensitivity and the optical transmitting and receiving signal quality of the ONU equipment are obtained, so that the quality of signal transmission is judged, and the performance of an ONU port is evaluated.
In the embodiment of the invention, a wavelength division multiplexer is added, a test circuit is reasonably arranged, so that a self-inspection optical signal sent by ONU equipment and received by a first optical interface is transmitted by the wavelength division multiplexer, is subjected to photoelectric conversion by the circuit, is converted into a corresponding electric signal, is amplified, is converted back into a corresponding optical signal by a laser driver and a laser generator, is subjected to power attenuation by an attenuator, and is finally transmitted back to the ONU equipment for verification by the wavelength division multiplexer and the first optical interface. By applying the test circuit structure of the loop, the self-checking test can be simultaneously carried out on the sending and receiving performances of the ONU port, the test topology is simple, and the test efficiency is greatly improved.
It should be noted that, in the above embodiment, the data flow process of the signal is as follows: the ONU equipment sends a first optical signal with a preset first wavelength, and utilizes the wavelength division multiplexing technology of a wavelength division multiplexer, wherein the first optical signal is firstly transmitted to a photoelectric conversion module through the wavelength division multiplexer, the first optical signal is converted into an electrical signal through the photoelectric conversion module, and then the electrical signal passes through a signal amplification module, the signal amplification module comprises a limiting amplifier which is used for providing an output level with fixed amplitude and integrating a power detection function, so that the power detection of the electrical signal is facilitated; then the electric signal generates a corresponding laser driving signal through the laser driver, and the laser generator generates the second optical signal correspondingly, so that the conversion process of the type of the signal from the optical signal to the electric signal and then to the optical signal is completed; and finally, performing power attenuation on the second optical signal by using an optical attenuator, wherein the attenuation is set to be equal to the sensitivity required by the ONU equipment, specifically, the optical attenuator can be a fixed attenuator or an adjustable attenuator, and the attenuated second optical signal is transmitted back to the ONU equipment by using a wavelength division multiplexing technology, so that the optical signal is originated by the ONU equipment, and the optical signal is subjected to branching and combining in a test circuit by using the wavelength division multiplexing technology and is finally transmitted back to the ONU equipment, thereby realizing the loop test process of transmission and reception.
Preferably, in the above embodiment, the ONU port testing circuit further includes an analog-to-digital conversion module 8, a detection end of which is connected to the sending end of the optical-to-electrical conversion module 3, and the analog-to-digital conversion module converts the electrical signal generated by the optical-to-electrical conversion module 3 into a corresponding digital signal, so as to trigger the laser driver 5 to generate a driving signal and generate a corresponding optical signal, and is configured to detect the transmission power of the self-test optical signal of the external ONU device according to the electrical signal sent by the optical-to-electrical conversion module 3.
Preferably, in the above embodiment, the optical-to-electrical conversion module includes a photodiode (not shown) for converting the received first optical signal into an electrical signal, and the photodiode is connected between an optical signal transmitting end of the wavelength division multiplexer and a receiving end of the signal amplification module.
Preferably, in the above embodiment, the signal amplification module includes a limiting amplifier (not shown) for amplifying the electrical signal sent by the photoelectric conversion module into a differential voltage signal, the limiting amplifier is connected between the photoelectric conversion module and the laser driver, and the electrical signal converted by the photodiode is subjected to digital-to-analog conversion through an ADC detection function of the limiting amplifier, so that the size of the light emitted by the ONU can be monitored.
Preferably, in the above embodiment, the first wavelength is 1310nm, and the second wavelength is 1490 nm. Optical signals with different wavelengths are transmitted in the same optical fiber through the wavelength division multiplexing technology of the wavelength division multiplexer. Of course, the optical signal may also adopt other preset wavelengths, which are determined by the specific ONU device and the test environment.
Preferably, in the above embodiment, the first optical signal sent by the ONU device carries a PRBS code sequence, the PRBS code sequence is generated by the ONU device autonomously and is loaded on the first optical signal for transmission, and the second optical signal returned by the first optical signal to the ONU device through the ONU port test circuit also carries a PRBS code sequence, so that the ONU device detects the signal quality of light emission and reception of the ONU device according to the PRBS code sequence of the first optical signal sent out and the PRBS code sequence of the second optical signal returned. And the PRBS code sequence is used for completing the verification of the PRBS through a loop test circuit, the coded data is compared with the latest received data, and the correctness of the verification of the PRBS is judged, so that the transmitting and receiving performance of the ONU port is obtained. It should be noted that, in the embodiment of the present invention, a PRBS code sequence is used as check information, an optical signal sent by an ONU device is a carrier signal, and the PRBS code sequence is mounted on the optical signal and is subjected to loop transmission by an ONU port test circuit to compare an initial PRBS code sequence with a newly received PRBS code sequence, thereby completing signal check; of course, the type of the pseudo-random binary sequence in other forms can be used as the evaluation index of the signal quality, and the protection scope of the present invention cannot be limited thereby.
Another embodiment of the present invention provides an ONU port testing apparatus (not shown) comprising the ONU port testing circuit described above. It should be noted that, for the device class embodiment, since it is basically similar to the above embodiment, the description is relatively simple, and for the relevant points, refer to the partial description of the above embodiment.
The ONU port testing device provided by the embodiment of the invention can quickly finish the self-checking test of emission and acceptance of the ONU port by virtue of the loop-back testing circuit, has lower power consumption and cost and simple structure, and can be applied to quick test under different complex environments on site.
Another embodiment of the present invention provides an ONU port testing system, specifically, please refer to fig. 2, which includes an ONU device and the ONU port testing apparatus as described above; wherein, the ONU device is connected to the first optical interface 1 by an optical fiber.
The port of the ONU device is configured to send a first optical signal to the ONU port testing apparatus and receive an attenuated second optical signal returned by the ONU port testing apparatus, and detect at least one of the following parameters according to the sent first optical signal and the attenuated second optical signal: the optical receiving sensitivity of the ONU equipment and the signal quality of optical emission and reception.
Preferably, in the above embodiment, the ONU device includes a processor 9, an optical module 10, and a second optical interface 11; the processor 9 is connected to the second optical interface 11 through the optical module 10, and the second optical interface 11 is connected to the first optical interface 1 through an optical fiber.
The processor 9 is configured to control the optical module 10 to generate a first optical signal with a preset first wavelength, and includes a CPU or other data microprocessor.
The optical module 10 is configured to generate the first optical signal and send the generated first optical signal to the second optical interface 11.
The second optical interface 11 is configured to send the first optical signal to the first optical interface 1, and send the attenuated second optical signal sent by the first optical interface 1 to the optical module 10;
the optical module 10 is further configured to convert the attenuated second optical signal into a corresponding electrical signal to be detected and send the electrical signal to the processor 9, so that the processor can perform data detection and processing.
The processor 9 is further configured to detect at least one of the following parameters according to the electrical signal to be detected: the optical receiving sensitivity of the ONU equipment and the quality of the signals received by the optical emission are checked through signal parameters, so that the transmitting and receiving performance of the ONU port is judged.
According to the ONU port test system provided by the embodiment of the invention, the optical signal self-generated by the ONU equipment is subjected to loop transmission and processing by the ONU port test device, and then the ONU equipment performs receiving and checking processing, so that the self-generation and self-checking of the optical signal are completed, the test system has a simple structure, the transmission and receiving performance of the ONU port is simultaneously checked, and the port test efficiency is greatly improved.
Another embodiment of the present invention provides an ONU port testing method, specifically, please refer to fig. 3, which includes:
s101, receiving a first optical signal with a preset first wavelength, which is sent by external ONU equipment;
s102, converting the first optical signal into an electric signal;
s103, amplifying the electric signal;
s104, converting the amplified electric signal into a driving signal;
s105, controlling a laser generator to generate a second optical signal with a preset second wavelength according to the driving signal;
s106, attenuating the second optical signal to a predetermined degree and sending the attenuated second optical signal to an ONU device, so that the ONU device detects at least one of the following parameters according to the sent first optical signal and the attenuated second optical signal: the optical receiving sensitivity of the ONU equipment and the signal quality of optical emission and reception. According to the ONU port testing method provided by the embodiment, the optical signal sent by the ONU equipment is subjected to photoelectric conversion and signal amplification, the laser driver is triggered to drive and generate the corresponding optical signal, then the corresponding power attenuation is carried out on the optical signal, the optical signal is received by the ONU equipment, and the loop transmission of the signal is completed.
The ONU port test circuit, the device, the system and the method provided by the invention combine two optical carrier signals with different wavelengths and carrying check information together by adding a wavelength division multiplexer, couple the optical carrier signals into the same optical fiber of an optical line, transmit the optical carrier signals through a transmission structure of a loop, and finally carry out further processing check by a processor of ONU equipment. The whole process utilizes spontaneous emission, conversion and self-receiving to quickly finish the self-checking test of the emission and receiving performance parameters of the ONU port without the help of test instruments such as an optical oscillograph, an error code meter and the like, the test topological structure is simple, the test cost is lower, the test efficiency is greatly improved, and the optical fiber resources are saved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
The ONU port testing circuit, the ONU port testing device, the ONU port testing system and the ONU port testing method provided by the present invention are described in detail above, and specific embodiments are applied herein to illustrate the principles and embodiments of the present invention, and the description of the embodiments above is only used to help understanding the method and the core idea of the ONU port testing system; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. An ONU port test circuit, comprising: the optical fiber amplifier comprises a first optical interface, a wavelength division multiplexer, a photoelectric conversion module, a signal amplification module, a laser driver, a laser generator and an optical attenuator;
the optical communication end of the first optical interface is connected with the optical communication end of the wavelength division multiplexer, and is used for sending a received first optical signal with a preset first wavelength, which is sent by the external ONU equipment, to the wavelength division multiplexer;
the wavelength division multiplexer is connected with an optical signal sending end of the photoelectric conversion module and used for sending the received first optical signal to the photoelectric conversion module;
the transmitting end of the photoelectric conversion module is connected with the receiving end of the signal amplification and power detection module and is used for converting the received first optical signal into an electric signal;
the transmitting end of the signal amplification module is connected with the receiving end of the laser driver and is used for amplifying the electric signal and transmitting the electric signal to the laser driver;
the transmitting end of the laser driver is connected with the receiving end of the laser generator and is used for converting the amplified electric signal into a driving signal and transmitting the driving signal to the laser generator;
the transmitting end of the laser generator is connected with the receiving end of the optical attenuator and is used for generating a second optical signal with a preset second wavelength according to the driving signal and generating the second optical signal to the optical attenuator;
the transmitting end of the optical attenuator is connected with the optical signal receiving end of the wavelength division multiplexer, and is used for attenuating the second optical signal to a predetermined degree and transmitting the attenuated second optical signal to the wavelength division multiplexer;
the wavelength division multiplexer is further configured to send the attenuated second optical signal to the first optical interface;
the first optical interface is further configured to send the received attenuated second optical signal to the ONU device, so that the ONU device detects at least one of the following parameters according to the sent first optical signal and the attenuated second optical signal: the optical receiving sensitivity of the ONU equipment and the signal quality of optical emission and reception.
2. The ONU port test circuit according to claim 1, further comprising an analog-to-digital conversion module, wherein a detection end of the analog-to-digital conversion module is connected to a transmission end of the optical-to-electrical conversion module, and the analog-to-digital conversion module is configured to measure the transmission power of the self-test optical signal of the external ONU device according to the electrical signal sent by the optical-to-electrical conversion module.
3. The ONU port test circuit according to claim 1, wherein the optical-to-electrical conversion module comprises a photodiode for converting the received first optical signal into an electrical signal, and the photodiode is connected between an optical signal transmitting end of the wavelength division multiplexer and a receiving end of the signal amplification module.
4. The ONU port test circuit according to claim 1, wherein the signal amplification module comprises a limiting amplifier for amplifying the electrical signal sent from the optical-to-electrical conversion module into a differential voltage signal, and the limiting amplifier is connected between the optical-to-electrical conversion module and the laser driver.
5. The ONU port test circuit of claim 1, wherein the first wavelength is 1310nm and the second wavelength is 1490 nm.
6. The ONU port testing circuit according to claim 1, wherein the first optical signal sent by the ONU device carries a PRBS code sequence, and the second optical signal returned to the ONU device by the ONU port testing circuit also carries a PRBS code sequence, so that the ONU device detects the quality of the signal received by the ONU device according to the PRBS code sequence of the first optical signal sent out and the PRBS code sequence of the second optical signal returned.
7. An ONU port testing device comprising the ONU port testing circuit according to any one of claims 1 to 6.
8. An ONU port testing system comprising an ONU device and the ONU port testing apparatus according to claim 7; the ONU equipment is connected with the first optical interface through an optical fiber;
the ONU device is configured to send a first optical signal to the ONU port testing apparatus, receive an attenuated second optical signal returned by the ONU port testing apparatus, and detect at least one of the following parameters according to the sent first optical signal and the attenuated second optical signal: the optical receiving sensitivity of the ONU equipment and the signal quality of optical emission and reception.
9. The ONU port testing system of claim 8, wherein the ONU device comprises a processor, an optical module, and a second optical interface; the processor is connected with the second optical interface through the optical module, and the second optical interface is connected with the first optical interface through an optical fiber;
the processor is used for controlling the optical module to generate a first optical signal with a preset first wavelength;
the optical module is used for sending the generated first optical signal to the second optical interface;
the second optical interface is configured to send the first optical signal to the first optical interface, and send the attenuated second optical signal sent by the first optical interface to the optical module;
the optical module is further configured to convert the attenuated second optical signal into a corresponding electrical signal to be detected and send the electrical signal to the processor;
the processor is further configured to detect at least one of the following parameters based on the electrical signal to be detected: the optical receiving sensitivity of the ONU equipment and the signal quality of optical emission and reception.
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| CN101790111B (en) * | 2009-01-23 | 2014-09-17 | 华为技术有限公司 | Method and device and system for detecting light distributed network |
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