CN114363740A - Optical module, equipment, fronthaul link system and performance detection method thereof - Google Patents
Optical module, equipment, fronthaul link system and performance detection method thereof Download PDFInfo
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Abstract
The disclosure provides an optical module, a device, a fronthaul link system and a performance detection method thereof. The optical module includes: the first transmitter is used for transmitting service information to the opposite-end optical module; the first detector is used for receiving service information from the opposite-end optical module; a second transmitter for transmitting the management information and the detection signal; the second detector is used for receiving the DDM information from the transmitter and the detector of the opposite-end optical module and receiving a return signal corresponding to the detection signal; and the processing unit is used for inquiring the DDM information of the transmitter and the detector of the local optical module, analyzing the transmission performance or the fault condition of the forward link according to the return signal, and reporting the DDM information of the transmitter and the detector of the local optical module, the DDM information of the transmitter and the detector of the opposite-end optical module and the transmission performance or the fault condition of the forward link to the network management platform.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to an optical module, an apparatus, a fronthaul link system, and a performance detection method thereof.
Background
The 5G (5th Generation Mobile Communication Technology, fifth Generation Mobile Communication Technology) era, Wavelength Division technologies such as CWDM (Coarse Wavelength Division Multiplexer, also called Coarse Wavelength Division Multiplexer) and MWDM (medium Wavelength Division Multiplexing), and WDM-PON (Wavelength Division Multiplexing-Passive Optical Network), can be used as a fronthaul bearer scheme. Taking the mobile forward-transmitting device of the CWDM passive color-light technology as an example, the 5G forward-transmitting passive color-light system based on the CWDM technology mainly comprises an optical module and a passive multiplexer/demultiplexer. At present, after a failure occurs in a current transmission network, a means for troubleshooting and diagnosing the failure is single, and particularly, remote failure diagnosis mainly determines the working state of an optical module by querying information of the optical module on a wireless network management platform.
Disclosure of Invention
The technical problem that this disclosure solved is: an optical module is provided to facilitate performance detection of a forward link.
According to an aspect of the present disclosure, there is provided a light module including: the first transmitter is used for transmitting service information to the opposite-end optical module; the first detector is used for receiving service information from the opposite-end optical module; a second transmitter for transmitting the management information and the detection signal; the second detector is used for receiving digital diagnosis monitoring function DDM information from a transmitter and a detector of the opposite-end optical module and receiving a return signal corresponding to the detection signal; and the processing unit is used for inquiring the DDM information of the transmitter and the detector of the local optical module, analyzing the transmission performance or the fault condition of the fronthaul link according to the return signal, and reporting the DDM information of the transmitter and the detector of the local optical module, the DDM information of the transmitter and the detector of the opposite-end optical module and the transmission performance or the fault condition of the fronthaul link to a network management platform.
In some embodiments, the detection signal includes a loopback detection instruction, and the return signal includes a loopback code pattern, where the opposite-end optical module executes a loopback operation after receiving the loopback detection instruction, and returns the loopback code pattern to the second detector; and the processing unit is used for determining the working state of the forward link according to the loopback code type.
In some embodiments, the detection signal includes error detection code pattern information, and the return signal includes used detection code pattern information, wherein the peer-end optical module obtains error rate detection statistical information during error rate detection, and returns the error rate detection statistical information to the second detector; and the processing unit is used for calculating packet loss rate and bit error rate according to the bit error rate detection statistical information to evaluate the transmission performance of the forward link and reporting the packet loss rate and the bit error rate to the network management platform.
In some embodiments, the detection signal comprises an optical time domain reflection OTDR detection pattern signal, and the return signal comprises a reflected signal, wherein, after the second transmitter transmits the OTDR detection pattern signal, the OTDR detection pattern signal is transmitted and reflected in the fronthaul link, and the second probe receives the reflected signal; the processing unit is used for evaluating the transmission performance or fault location of the forward link according to the reflected signal of the OTDR detection code pattern signal.
In some embodiments, the second transmitter emits a signal having a different wavelength than the signal emitted by the first transmitter.
In some embodiments, the light module further comprises: and the modulator is used for modulating and generating the OTDR detection code pattern signal.
In some embodiments, the error detection pattern information comprises: and appointing the type of the transmitted packets, the number of the packets, the size of the packets, the start bit identifier and the check bit identifier information.
According to another aspect of the present disclosure, there is provided an apparatus comprising: the light module as described above.
According to another aspect of the present disclosure, there is provided a fronthaul link system including: the optical fiber module comprises a local side optical module, a terminal optical module and an optical fiber connected between the local side optical module and the terminal optical module; the local side optical module includes: the first transmitter is used for transmitting service information to the terminal optical module; the first detector is used for receiving service information from the terminal optical module; a second transmitter for transmitting the management information and the detection signal; the second detector is used for receiving the DDM information from the transmitter and the detector of the terminal optical module and receiving a return signal corresponding to the detection signal; and the processing unit is used for inquiring the DDM information of the transmitter and the detector of the local optical module, analyzing the transmission performance or the fault condition of the forward link according to the return signal, and reporting the DDM information of the transmitter and the detector of the local optical module, the DDM information of the transmitter and the detector of the terminal optical module and the transmission performance or the fault condition of the forward link to the network management platform.
In some embodiments, the terminal light module includes: a third transmitter, configured to send service information to the local optical module; a third detector, configured to receive service information from the local-side optical module; a fourth transmitter, configured to send, to the local-side optical module, DDM information of the transmitter and the detector of the terminal optical module and a return signal corresponding to the detection signal; and a fourth detector for receiving the management information and the detection signal.
In some embodiments, the local side optical module further includes: and the modulator is used for modulating and generating the OTDR detection code pattern signal.
In some embodiments, the fronthaul link system further comprises: a demultiplexer and a multiplexer; the optical module comprises a local optical module, a terminal optical module, a demultiplexer, a multiplexer and a filter, wherein the demultiplexer and the multiplexer are arranged between the local optical module and the terminal optical module, the demultiplexer is arranged at one side close to the local optical module, the multiplexer is arranged at one side close to the terminal optical module, and the filter is arranged in the demultiplexer and the multiplexer.
According to another aspect of the present disclosure, there is provided a performance detection method for the fronthaul link system as described above, including: the local side optical module sends first management information to the terminal optical module, and inquires DDM information of a first transmitter, a first detector, a second transmitter and a second detector of the local side optical module, wherein the first management information comprises a loopback detection instruction; after receiving the loopback detection instruction through a fourth detector, the terminal optical module queries DDM information of a third transmitter, a third detector, a fourth transmitter and a fourth detector of the terminal optical module; the terminal optical module sends a loopback detection response instruction to the local side optical module and reports all the inquired DDM information to the local side optical module; the local side optical module reports the DDM information of the terminal optical module and the DDM information of the local side optical module to a network management platform; the local side optical module sends a loopback code pattern to the terminal optical module; the terminal optical module executes optical loopback operation after receiving the loopback code pattern and returns the loopback code pattern to the local side optical module; and the local side optical module determines the working state of the forward link according to the loopback code type and reports the working state to the network management platform.
In some embodiments, the performance detection method further comprises: the local side optical module sends second management information to the terminal optical module, and inquires DDM information of a first transmitter, a first detector, a second transmitter and a second detector of the local side optical module, wherein the second management information comprises an error code detection instruction; after receiving the error code detection instruction, the terminal optical module inquires DDM information of a third transmitter, a third detector, a fourth transmitter and a fourth detector of the terminal optical module; the terminal optical module sends an error code detection response instruction to the local side optical module and reports all the inquired DDM information to the local side optical module; the local side optical module reports the DDM information of the terminal optical module and the DDM information of the local side optical module to a network management platform; the local side optical module sends error code detection code pattern information to the terminal optical module; the terminal optical module receives the code type information of the error code detection, counts and obtains error code rate detection statistical information during the error code rate detection period, and returns the error code rate detection statistical information to the local side optical module; and the local side optical module calculates the packet loss rate and the bit error rate according to the bit error rate detection statistical information to evaluate the transmission performance of the forward link, and reports the packet loss rate and the bit error rate to the network management platform.
In some embodiments, the performance detection method further comprises: the optical module at the local side sends third management information to the optical module at the terminal, and inquires DDM information of a first transmitter, a first detector, a second transmitter and a second detector of the optical module at the local side, wherein the third management information comprises an OTDR detection instruction; after receiving the OTDR detection instruction, the terminal optical module queries DDM information of a third transmitter, a third detector, a fourth transmitter and a fourth detector of the terminal optical module; the terminal optical module sends an OTDR detection response instruction to the local side optical module and reports all the inquired DDM information to the local side optical module; the local side optical module reports the DDM information of the terminal optical module and the DDM information of the local side optical module to a network management platform; the local side optical module sends out an OTDR detection code pattern signal, wherein the OTDR detection code pattern signal is transmitted and reflected in a forward link; and the local side optical module receives the reflection information of the OTDR detection code pattern signal through the second detector, evaluates the transmission performance or fault location of the forward link according to the reflection signal, and reports the transmission performance or fault location to the network management platform.
The optical module can conveniently detect the performance of the forward link.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
FIG. 1 is a block diagram schematically illustrating the structure of a light module according to some embodiments of the present disclosure;
FIG. 2 is a block diagram that schematically illustrates a light module, in accordance with further embodiments of the present disclosure;
fig. 3 is a schematic diagram that schematically illustrates a structure of a fronthaul link system, in accordance with some embodiments of the present disclosure;
FIG. 4 is a flow diagram illustrating a performance detection method for a fronthaul link system according to some embodiments of the present disclosure;
FIG. 5 is a flow diagram illustrating a performance detection method for a fronthaul link system according to further embodiments of the present disclosure;
fig. 6 is a flow chart illustrating a performance detection method for a fronthaul link system according to further embodiments of the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a block diagram schematically illustrating the structure of a light module according to some embodiments of the present disclosure. As shown in fig. 1, the light module comprises a first transmitter 101, a first detector 111, a second transmitter 102, a second detector 112 and a processing unit 120. For example, the first transmitter 101 and the second transmitter 102 may be lasers.
The first transmitter 101 is configured to send a service message to the peer optical module.
The first probe 111 is used for receiving the traffic information from the peer optical module.
The second transmitter 102 is used to send out management information and detection signals. For example, the second transmitter emits a signal having a different wavelength than the signal emitted by the first transmitter.
The second probe 112 is used for receiving DDM (Digital Diagnostic Monitoring) information from the transmitter and the probe of the peer optical module, and receiving a return signal corresponding to the detection signal. For example, the return signal may be a response signal or a reflected signal.
In some embodiments, the DDM information includes: transmitting optical power, receiving optical power, operating temperature, operating current, operating voltage, and the like.
The processing unit 120 is configured to query DDM information of the transmitter and the detector of the local optical module, analyze transmission performance or a fault condition of the forward link according to the return signal, and report the DDM information of the transmitter and the detector of the local optical module, the DDM information of the transmitter and the detector of the opposite-end optical module, and the transmission performance or the fault condition of the forward link to the network management platform.
In some embodiments, the detection signal includes a loopback detection instruction, and the return signal includes a loopback code pattern, where the peer optical module performs a loopback operation after receiving the loopback detection instruction, and returns the loopback code pattern to the second probe 112. The processing unit 120 is configured to determine an operating state of the forwarding link according to the loopback code type. This implements a loop back detection function.
In other embodiments, the detection signal includes the error detection pattern information, and the return signal includes the used detection pattern information, wherein the peer optical module statistically obtains the error rate detection statistical information during the error rate detection, and returns the error rate detection statistical information to the second detector 112. The processing unit 120 is configured to calculate a packet loss rate and an error rate according to the error rate detection statistical information to evaluate the transmission performance of the forward link, and report the packet loss rate and the error rate to the network management platform. This implements the bit error rate detection function.
For example, the error detection pattern information includes: and appointing the type of the transmitted packets, the number of the packets, the size of the packets, the start bit identifier and the check bit identifier information.
In other embodiments, the detection signal comprises an OTDR (Optical Time Domain Reflectometer) detection pattern signal, and the return signal comprises a reflection signal, wherein after the second transmitter transmits the OTDR detection pattern signal, the OTDR detection pattern signal is transmitted and reflected in the forward link, and the second detector 112 receives the reflection signal. The processing unit 120 is configured to evaluate transmission performance or fault location of the forwarding link according to the reflected signal of the OTDR detection pattern signal. This implements the OTDR detection function.
Thus, there is provided an optical module according to some embodiments of the present disclosure. The optical module includes: the first transmitter is used for transmitting service information to the opposite-end optical module; the first detector is used for receiving service information from the opposite-end optical module; a second transmitter for transmitting the management information and the detection signal; the second detector is used for receiving the DDM information from the transmitter and the detector of the opposite-end optical module and receiving a return signal corresponding to the detection signal; and the processing unit is used for inquiring the DDM information of the transmitter and the detector of the local optical module, analyzing the transmission performance or the fault condition of the forward link according to the return signal, and reporting the DDM information of the transmitter and the detector of the local optical module, the DDM information of the transmitter and the detector of the opposite-end optical module and the transmission performance or the fault condition of the forward link to the network management platform. The optical module can conveniently detect the performance of the forward link. For example, the optical module may facilitate at least one of a loopback detection function, an error rate detection function, and an OTDR detection function.
FIG. 2 is a block diagram that schematically illustrates optical modules in accordance with further embodiments of the present disclosure.
As shown in fig. 2, the light module comprises a first transmitter 101, a first detector 111, a second transmitter 102, a second detector 112 and a processing unit 120.
In some embodiments, as shown in fig. 2, the optical module may further include a modulator 130. Modulator 130 is used for modulation to generate an OTDR detection pattern signal. For example, the second transmitter 102 transmits a signal with a predetermined wavelength, which is modulated into an OTDR detection pattern signal through the modulator 130 and transmitted to the optical module at the opposite end. For example, the peer optical module is a terminal optical module.
In some embodiments, the optical module may be a local side optical module or a terminal optical module.
In some embodiments of the present disclosure, there is also provided an apparatus comprising a light module as described above. For example, the device may be a central office device or a terminal device. For example, the local side device may be a CU (Centralized Unit) and/or a DU (distributed Unit). For example, the terminal device may be an AAU (Active Antenna Unit).
In the above embodiments of the present disclosure, for example, a set of low-rate and third-wavelength transmitting and receiving optoelectronic components may be added on the basis of the existing 25G-rate transmitting and receiving optoelectronic components: the light module is provided with a second transmitter, e.g. a second laser, for management and fault detection. The second laser uses a third wavelength, not the existing mobile fronthaul operating wavelength. The downstream direction of the central office end of the forward transmission system uniformly adopts a wavelength lambda 1 (first wavelength), and the upstream direction uniformly adopts a wavelength lambda 2 (second wavelength). The local side optical module is additionally provided with a modulator, and modulation work is started according to needs to generate an OTDR detection optical signal (during OTDR detection work). The modulator is not operated when the OTDR is not detected and the second transmitter is used to transmit the management signal. The fronthaul optical module is provided with a second detector for management and fault detection: the second photodetector is for receiving a signal at a management wavelength.
Fig. 3 is a schematic diagram that schematically illustrates a fronthaul link system, in accordance with some embodiments of the present disclosure.
As shown in fig. 3, the fronthaul link system includes: an office optical module 310 (or 320, 330), a terminal optical module 340 (or 350, 360), and an optical fiber 370 connected between the office optical module and the terminal optical module.
Although fig. 3 shows 3 pairs of the office optical module and the terminal optical module, the scope of the present disclosure is not limited thereto. In some embodiments, the fronthaul link system may include less than 3 (e.g., 1 or 2) or more than 3 pairs of office optical modules and terminal optical modules. Accordingly, the scope of the present disclosure is not limited to the number of the office optical module and the terminal optical module.
The local-side optical module 310 will be described as an example.
The local side optical module 310 includes a first transmitter 3101, a second transmitter 3102, a first detector 3111 and a second detector 3112.
The first transmitter 3101 is used to transmit traffic information to the terminal optical module 340.
The first probe 3111 is used for receiving traffic information from the terminal optical module 340.
The second transmitter 3102 is used to transmit management information and detection signals.
The second probe 3112 is for receiving DDM information from the transmitter and probe of the terminal optical module 340 and receiving a return signal corresponding to the detection signal.
The local-side optical module 310 further includes a processing unit (not shown in fig. 3). The processing unit is used for inquiring DDM information of a transmitter and a detector of the local optical module, analyzing the transmission performance or the fault condition of the forward link according to the return signal, and reporting the DDM information of the transmitter and the detector of the local optical module, the DDM information of the transmitter and the detector of the terminal optical module and the transmission performance or the fault condition of the forward link to the network management platform.
In some embodiments, as shown in fig. 3, the office light module 310 may further include a modulator 3130. The modulator is used for modulating and generating an OTDR detection code pattern signal.
Similarly, the office optical module 320 includes a first transmitter 3201, a second transmitter 3202, a first detector 3211, a second detector 3212, a processing unit, and a modulator 3230; the local side optical module 330 includes a first transmitter 3301, a second transmitter 3302, a first detector 3311, a second detector 3312, a processing unit, and a modulator 3330.
The following description will take the terminal optical module 340 as an example. The terminal optical module may also be referred to as a remote optical module.
As shown in fig. 3, the terminal optical module 340 includes a third transmitter 3403, a fourth transmitter 3404, a third detector 3413, and a fourth detector 3414.
The third transmitter 3403 is configured to transmit traffic information to the local optical module.
The third detector 3413 is used for receiving service information from the optical module at the local side.
The fourth transmitter 3404 is configured to transmit DDM information of the transmitter and the probe of the terminal optical module 340 and a return signal corresponding to the detection signal to the office optical module 310.
The fourth detector 3414 is used for receiving the management information and the detection signal.
In some embodiments, the wavelength of the signal emitted by the fourth transmitter is different from the wavelength of the signal emitted by the third transmitter.
Similarly, the terminal light module 350 includes a third transmitter 3503, a fourth transmitter 3504, a third detector 3513 and a fourth detector 3514; the terminal optical module 360 includes a third transmitter 3603, a fourth transmitter 3604, a third detector 3613 and a fourth detector 3614.
In some embodiments, as shown in fig. 3, the fronthaul link system may further include a demultiplexer 381 and a multiplexer 382. The demultiplexer 381 and the multiplexer 382 are disposed between the optical module at the local side and the optical module at the terminal side, the demultiplexer 381 is disposed at the side close to the optical module at the local side, and the multiplexer 382 is disposed at the side close to the optical module at the terminal side. Filters may be provided inside the demultiplexer and the multiplexer. The filter can meet the transmission requirement of the wavelength of the management information, for example, the requirement that each channel can realize the transmission of the management wavelength signal can be met.
The fronthaul link system can facilitate performance detection of the fronthaul link. For example, the fronthaul link system may facilitate at least one of a loopback detection function, an error rate detection function, and an OTDR detection function. The method and the system realize effective management and fault diagnosis of the mobile forward transmission system and meet the intelligent operation requirement of a high-quality forward transmission network.
The loopback detection function, the bit error rate detection function, and the OTDR detection function are described in detail below with reference to fig. 4 to 6, respectively.
Fig. 4 is a flow diagram illustrating a performance detection method for a fronthaul link system according to some embodiments of the present disclosure. This fig. 4 shows the implementation of the loop back detection function. As shown in fig. 4, the method includes steps S402 to S414. The method of fig. 4 is described below with reference to the office side optical module 310 and the terminal side optical module 340 in fig. 3.
In step S402, the office optical module 310 sends first management information to the terminal optical module 340, and queries DDM information of the first transmitter 3101, the first probe 3111, the second transmitter 3102, and the second probe 3112 of the office optical module, where the first management information includes a loopback detection instruction. For example, the optical module at the local side controls to start the second transmitter to send the management information to the optical module at the terminal. For example, the DDM information includes: transmitting optical power, receiving optical power, operating temperature, operating current and operating voltage.
In step S404, after the terminal optical module 340 receives the loopback detection instruction through the fourth detector 3404, the DDM information of the third transmitter 3403, the third detector 3413, the fourth transmitter 3404, and the fourth detector 3414 of the terminal optical module is queried. For example, the DDM information includes: transmitting optical power, receiving optical power, operating temperature, operating current and operating voltage.
In step S406, the terminal optical module 340 sends a loopback detection response instruction to the office optical module, and reports all the queried DDM information to the office optical module 310.
In step S408, the office optical module 310 reports the DDM information of the terminal optical module and the DDM information of the office optical module to the network management platform.
In step S410, the office optical module 310 sends a loopback code type to the terminal optical module 340. For example, the office optical module sends a specific optical loopback pattern to start loopback detection.
In step S412, the terminal optical module 340 executes optical loopback operation after receiving the loopback code pattern, and returns the loopback code pattern to the office optical module 310.
For example, a second optoelectronic component of the terminal optical module (the second optoelectronic component includes a fourth transmitter, a fourth detector, and other matched optoelectronic devices) performs optical loopback operation, and locally loops back a system-specific optical loopback code pattern in real time and sends the loopback code pattern back to the local-side optical module. The optical loopback operation of the second photoelectric component does not affect the normal work of the first photoelectric component (the first photoelectric component comprises a third transmitter, a third detector and other matched photoelectric devices), and the mobile service is not affected. The loopback operation is a technique known to those skilled in the art and will not be described in detail herein.
In step S414, the office optical module 310 determines the working state of the forward link according to the loopback code type and reports the working state to the network management platform. For example, the office-side optical module may determine whether the working state of the forward link is normal according to the loopback code type, and may report information of the normal state or the abnormal state to the network management platform.
The network management platform can receive the DDM information of the local optical module and the terminal optical module and the working state of the forward link.
Thus, a performance detection method for a fronthaul link system according to some embodiments of the present disclosure is provided. The method realizes the loopback detection function.
Fig. 5 is a flow chart illustrating a performance detection method for a fronthaul link system according to further embodiments of the present disclosure. Fig. 5 shows an implementation of the bit error rate detection function. As shown in fig. 5, the method includes steps S502 to S514. The method of fig. 5 is described below in conjunction with the office side optical module 320 and the terminal side optical module 350 of fig. 3.
In step S502, the office optical module 320 sends second management information to the terminal optical module 350, and queries DDM information of the first transmitter 3201, the first detector 3211, the second transmitter 3202, and the second detector 3212 of the office optical module, where the second management information includes an error detection instruction. For example, the local optical module controls to start the second transmitter to transmit the second management information to the remote optical module. For example, the DDM information includes: transmitting optical power, receiving optical power, operating temperature, operating current and operating voltage.
In step S504, after receiving the error detection command, the terminal optical module 350 queries DDM information of the third transmitter 3503, the third probe 3513, the fourth transmitter 3504 and the fourth probe 3514 of the terminal optical module. For example, the DDM information includes: transmitting optical power, receiving optical power, operating temperature, operating current and operating voltage.
In step S506, the terminal optical module 350 sends an error detection response command to the office optical module 320, and reports all the DDM information obtained by the query to the office optical module.
In step S508, the office optical module 320 reports the DDM information of the terminal optical module and the DDM information of the office optical module to the network management platform.
In step S510, the office optical module 320 transmits error detection code pattern information to the terminal optical module 350. For example, the optical module at the office side transmits system-specific error detection pattern information to start error detection. The error detection pattern information may include: and appointing information such as the type of the transmitted packets, the number of the packets, the size of the packets, the identifier of the start bit, the identifier of the check bit and the like.
In step S512, the terminal optical module 350 receives the error detection code pattern information, counts and obtains error rate detection statistical information during the error rate detection period, and returns the error rate detection statistical information to the office optical module 320. The second optoelectronic component (the second optoelectronic component includes the fourth transmitter, the fourth detector and other matched optoelectronic devices) of the terminal optical module 350 performs the bit error rate detection operation without affecting the normal operation of the first optoelectronic component (the first optoelectronic component includes the third transmitter, the third detector and other matched optoelectronic devices), so as to ensure that the mobile service is not affected.
In step S514, the office optical module 320 calculates the packet loss rate and the bit error rate according to the bit error rate detection statistical information to evaluate the transmission performance of the forward link, and reports the packet loss rate and the bit error rate to the network management platform.
The network management platform can receive the DDM information of the local optical module and the terminal optical module and the packet loss rate and the bit error rate of the forward link.
Thus, a performance detection method for a fronthaul link system according to some embodiments of the present disclosure is provided. The method realizes the function of detecting the error rate.
Fig. 6 is a flow chart illustrating a performance detection method for a fronthaul link system according to further embodiments of the present disclosure. Fig. 6 shows an implementation of the OTDR detection function. As shown in fig. 6, the method includes steps S602 to S612. The method of fig. 6 is described below in conjunction with the office side optical module 330 and the terminal side optical module 360 of fig. 3.
In step S602, the office optical module 330 sends third management information to the terminal optical module 360, and queries DDM information of the first transmitter 3301, the first probe 3311, the second transmitter 3302, and the second probe 3312 of the office optical module, where the third management information includes an OTDR detection instruction. For example, the local optical module controls to start the second transmitter to transmit the third management information to the terminal optical module. For example, the DDM information includes: transmitting optical power, receiving optical power, operating temperature, operating current and operating voltage.
In step S604, after receiving the OTDR detection instruction, the terminal optical module 360 queries DDM information of the third transmitter 3603, the third detector 3613, the fourth transmitter 3604, and the fourth detector 3614 of the terminal optical module. For example, the DDM information includes: transmitting optical power, receiving optical power, operating temperature, operating current and operating voltage.
In step S606, the terminal optical module 360 sends an OTDR detection response instruction to the office optical module 330, and reports all the DDM information obtained by the query to the office optical module.
In step S608, the office optical module 330 reports the DDM information of the terminal optical module and the DDM information of the office optical module to the network management platform.
In step S610, the office optical module 330 sends an OTDR detection pattern signal, where the OTDR detection pattern signal is transmitted and reflected in the forward link. For example, the local optical module starts an OTDR detection modulation function (software or hardware), and may modulate an OTDR detection pattern based on the third management signal and send the modulated OTDR detection pattern by the second transmitter.
For example, as shown in fig. 3, a fault point 372 on the optical fiber 370 may reflect an OTDR detection pattern signal that is received by the second probe 3312 of the local side optical module.
In step S612, the office optical module 330 receives the reflection information of the OTDR detection pattern signal through the second detector 3312, evaluates transmission performance (e.g., loss or transmission distance, etc.) or fault location (e.g., determines the location of the fault point 372) of the forward link according to the reflection signal, and reports the result to the network management platform.
It should be noted that the principle of obtaining transmission performance or fault location by OTDR detection is obvious to those skilled in the art and will not be described in detail here.
The network management platform can receive the DDM information of the local optical module and the terminal optical module and the transmission performance or fault location of the forward link.
Thus, a performance detection method for a fronthaul link system according to some embodiments of the present disclosure is provided. The method realizes the OTDR detection function.
In the embodiment of the present disclosure, a set of second optical transceiver components is added to the fronthaul optical module, which includes a low-rate transmitter (i.e., optical transmitter) and an optical detector and associated optoelectronic components. The filter is added in the front-end passive multiplexer and demultiplexer to meet the transmission requirement of the management wavelength.
The method realizes the functions of monitoring the link performance of the fronthaul system, detecting the error rate, positioning the fault of the fronthaul optical link and the like by means of specific management wavelength. And the online loopback detection mechanism verifies the on-off performance of the link through real-time bidirectional loopback detection of the management channel under the normal working state of the service channel. The bit error rate detection mechanism sends a test message through a management channel and gives an equivalent service bit error rate under the same optical link performance state through calculation and analysis of the sent and received test messages. The link fault analysis and diagnosis mechanism is used for carrying out OTDR test on the front optical transmission link by managing the wavelength of the channel and sending messages of an OTDR detection code pattern by means of the modulator, and positioning the position and the loss of a connector, the link loss, the light reflection performance and the diagnosis and the positioning of fault points (optical fiber breakage, large connector loss and the like).
The present disclosure provides a set of mechanisms for mobile forwarding management and fault detection, which specifically includes:
1. the management mechanism specifically includes:
the management information interaction between the local side and the terminal optical module comprises the following steps: information interaction during operations such as loopback detection, error rate analysis, OTDR detection, turning on/off of a second transmitter (namely, a second laser), reporting of detection data and the like are started. Before the strategy is executed, the second laser of the local optical module can be turned on, corresponding instructions are sent, and detection is started after the corresponding instructions of the terminal optical module are received. After receiving the local side optical module detection instruction each time, the terminal optical module defaults to report the relevant DDM information of the third transmitter and the third detector and the relevant DDM information of the fourth transmitter and the fourth detector to the local side equipment and transmit the local side equipment and the local side equipment to the network management platform. After each detection instruction is sent, the local side optical module also synchronously inquires the related DDM information of the first transmitter and the first detector and reports the related DDM information of the second transmitter and the second detector to the network management platform.
2. The fault detection mechanism specifically comprises:
1) online loopback detection: a second transmitter of the local side optical module initiates loopback detection, a terminal optical module receives an instruction to implement internal self-loopback matching detection, and a second optical detector of the local side optical module receives loopback detection signals; 2) optical Time Domain Reflectometry (OTDR) detection: the second transmitter of the local side optical module initiates an OTDR detection function, and an OTDR detection code pattern signal is modulated through the modulator; and receiving the reflected OTDR signal by a second optical detector of the local optical module to detect and position the forward optical link event (including normal and fault events).
3. The transmission performance detection mechanism specifically includes:
1) and starting error code detection analysis according to a policy (manual/automatic) system, and appointing a terminal optical module to send a specific detection code pattern. The specific format of the code pattern can be fixed in the optical module determined in advance, or a new format can be defined according to the test requirement, and the local optical module sends an instruction to the terminal optical module. The local side optical module receives the detection signal through the second optical detector, performs service error rate analysis and reports the detection signal to a service management platform (wireless network management platform); 2) the second optical transceiving component can carry out real-time bit error rate detection, normal transmission of services is not influenced, extra decoding analysis is not carried out on service messages, and the safety is high; bit error rate detection can be performed even at the time of traffic idle.
Compared with the prior art, the method and the device support the diagnosis functions of the service error rate, the link interruption positioning, the link loss and the event loss on the basis that the existing wireless equipment reads the DDM information of the optical module. And through remote performance detection, a service bit error rate test, the length and the loss of a front-end optical transmission link, the position and the loss of a connector are provided. And also has remote failure diagnosis, including: and the on-line loopback diagnoses the on-off of the link and the OTDR diagnoses the fault position.
Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (15)
1. A light module, comprising:
the first transmitter is used for transmitting service information to the opposite-end optical module;
the first detector is used for receiving service information from the opposite-end optical module;
a second transmitter for transmitting the management information and the detection signal;
the second detector is used for receiving digital diagnosis monitoring function DDM information from a transmitter and a detector of the opposite-end optical module and receiving a return signal corresponding to the detection signal; and
and the processing unit is used for inquiring the DDM information of the transmitter and the detector of the local optical module, analyzing the transmission performance or the fault condition of the fronthaul link according to the return signal, and reporting the DDM information of the transmitter and the detector of the local optical module, the DDM information of the transmitter and the detector of the opposite-end optical module and the transmission performance or the fault condition of the fronthaul link to a network management platform.
2. The light module of claim 1,
the detection signal comprises a loopback detection instruction, and the return signal comprises a loopback code type, wherein the opposite-end optical module executes optical loopback operation after receiving the loopback detection instruction, and returns the loopback code type to the second detector;
and the processing unit is used for determining the working state of the forward link according to the loopback code type.
3. The light module of claim 1,
the detection signal comprises error code detection code type information, and the return signal comprises used detection code type information, wherein the opposite-end optical module counts to obtain error code rate detection statistical information during the error code rate detection period and returns the error code rate detection statistical information to the second detector;
and the processing unit is used for calculating packet loss rate and bit error rate according to the bit error rate detection statistical information to evaluate the transmission performance of the forward link and reporting the packet loss rate and the bit error rate to the network management platform.
4. The light module of claim 1,
the detection signal includes an optical time domain reflection OTDR detection pattern signal, and the return signal includes a reflection signal, where after the second transmitter transmits the OTDR detection pattern signal, the OTDR detection pattern signal is transmitted and reflected in the fronthaul link, and the second detector receives the reflection signal;
the processing unit is used for evaluating the transmission performance or fault location of the forward link according to the reflected signal of the OTDR detection code pattern signal.
5. The light module of claim 1,
the wavelength of the signal emitted by the second transmitter is different from the wavelength of the signal emitted by the first transmitter.
6. The light module of claim 4, further comprising:
and the modulator is used for modulating and generating the OTDR detection code pattern signal.
7. The light module of claim 3,
the error detection pattern information includes: and appointing the type of the transmitted packets, the number of the packets, the size of the packets, the start bit identifier and the check bit identifier information.
8. An apparatus, comprising: a light module as claimed in any one of claims 1 to 7.
9. A fronthaul link system, comprising: the optical fiber module comprises a local side optical module, a terminal optical module and an optical fiber connected between the local side optical module and the terminal optical module;
the local side optical module includes:
the first transmitter is used for transmitting service information to the terminal optical module;
the first detector is used for receiving service information from the terminal optical module;
a second transmitter for transmitting the management information and the detection signal;
the second detector is used for receiving the DDM information from the transmitter and the detector of the terminal optical module and receiving a return signal corresponding to the detection signal; and
and the processing unit is used for inquiring the DDM information of the transmitter and the detector of the local optical module, analyzing the transmission performance or the fault condition of the forward link according to the return signal, and reporting the DDM information of the transmitter and the detector of the local optical module, the DDM information of the transmitter and the detector of the terminal optical module and the transmission performance or the fault condition of the forward link to a network management platform.
10. The fronthaul link system of claim 9, wherein the terminal light module comprises:
a third transmitter, configured to send service information to the local optical module;
a third detector, configured to receive service information from the local-side optical module;
a fourth transmitter, configured to send, to the local-side optical module, DDM information of the transmitter and the detector of the terminal optical module and a return signal corresponding to the detection signal; and
and the fourth detector is used for receiving the management information and the detection signal.
11. The fronthaul link system according to claim 10, wherein the office optical module further comprises:
and the modulator is used for modulating and generating the OTDR detection code pattern signal.
12. The fronthaul link system of claim 9, further comprising: a demultiplexer and a multiplexer;
the optical module comprises a local optical module, a terminal optical module, a demultiplexer, a multiplexer and a filter, wherein the demultiplexer and the multiplexer are arranged between the local optical module and the terminal optical module, the demultiplexer is arranged at one side close to the local optical module, the multiplexer is arranged at one side close to the terminal optical module, and the filter is arranged in the demultiplexer and the multiplexer.
13. A performance detection method for the fronthaul link system of any one of claims 9 to 12, comprising:
the local side optical module sends first management information to the terminal optical module, and inquires DDM information of a first transmitter, a first detector, a second transmitter and a second detector of the local side optical module, wherein the first management information comprises a loopback detection instruction;
after receiving the loopback detection instruction through a fourth detector, the terminal optical module queries DDM information of a third transmitter, a third detector, a fourth transmitter and a fourth detector of the terminal optical module;
the terminal optical module sends a loopback detection response instruction to the local side optical module and reports all the inquired DDM information to the local side optical module;
the local side optical module reports the DDM information of the terminal optical module and the DDM information of the local side optical module to a network management platform;
the local side optical module sends a loopback code pattern to the terminal optical module;
the terminal optical module executes optical loopback operation after receiving the loopback code pattern and returns the loopback code pattern to the local side optical module; and
and the local side optical module determines the working state of the forward link according to the loopback code type and reports the working state to the network management platform.
14. The performance testing method of claim 13, further comprising:
the local side optical module sends second management information to the terminal optical module, and inquires DDM information of a first transmitter, a first detector, a second transmitter and a second detector of the local side optical module, wherein the second management information comprises an error code detection instruction;
after receiving the error code detection instruction, the terminal optical module inquires DDM information of a third transmitter, a third detector, a fourth transmitter and a fourth detector of the terminal optical module;
the terminal optical module sends an error code detection response instruction to the local side optical module and reports all the inquired DDM information to the local side optical module;
the local side optical module reports the DDM information of the terminal optical module and the DDM information of the local side optical module to a network management platform;
the local side optical module sends error code detection code pattern information to the terminal optical module;
the terminal optical module receives the code type information of the error code detection, counts and obtains error code rate detection statistical information during the error code rate detection period, and returns the error code rate detection statistical information to the local side optical module; and
and the local side optical module calculates the packet loss rate and the bit error rate according to the bit error rate detection statistical information to evaluate the transmission performance of the forward link, and reports the packet loss rate and the bit error rate to the network management platform.
15. The performance detection method of claim 13 or 14, further comprising:
the optical module at the local side sends third management information to the optical module at the terminal, and inquires DDM information of a first transmitter, a first detector, a second transmitter and a second detector of the optical module at the local side, wherein the third management information comprises an OTDR detection instruction;
after receiving the OTDR detection instruction, the terminal optical module queries DDM information of a third transmitter, a third detector, a fourth transmitter and a fourth detector of the terminal optical module;
the terminal optical module sends an OTDR detection response instruction to the local side optical module and reports all the inquired DDM information to the local side optical module;
the local side optical module reports the DDM information of the terminal optical module and the DDM information of the local side optical module to a network management platform;
the local side optical module sends out an OTDR detection code pattern signal, wherein the OTDR detection code pattern signal is transmitted and reflected in a forward link; and
and the local side optical module receives the reflection information of the OTDR detection code pattern signal through the second detector, evaluates the transmission performance or fault location of the forward link according to the reflection signal, and reports the transmission performance or fault location to the network management platform.
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