CN112968734A - Optical module, method for realizing network management function of optical module and optical communication equipment - Google Patents
Optical module, method for realizing network management function of optical module and optical communication equipment Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract
The invention relates to the technical field of optical communication, and discloses an optical module, a method for realizing a network management function of the optical module and optical communication equipment. The optical module includes: the device comprises an MCU, a light receiving component and a signal amplifying unit; the MCU comprises a voltage comparator and a communication interface unit; the optical receiving component is used for receiving an optical signal bearing service management information, converting the optical signal into an analog voltage signal, and inputting the analog voltage signal to the signal amplifying unit after alternating current coupling; the signal amplification unit is used for amplifying the analog voltage signal; the voltage comparator is used for demodulating a digital signal from the amplified analog voltage signal according to the reference voltage; and the communication interface unit is used for decoding the digital signal and acquiring the service management information. The optical module of the embodiment of the invention realizes the service management function, not only solves the problems of difficult troubleshooting and difficult maintenance of WDM faults, but also has obvious cost advantage because the coding and decoding functions are realized by only adopting a single MCU.
Description
Technical Field
The present invention relates to the field of optical communication technologies, and in particular, to an optical module, a method for implementing a network management function of the optical module, and an optical communication device.
Background
In the process of laying a network architecture, in order to solve the problem that the cost of optical fiber resources or the quantity of laid land resources is short, the WDM (Wavelength Division Multiplexing) technology is widely applied to an optical fiber communication network. The active WDM equipment system has outstanding advantages in fault diagnosis and interface number in the process of fiber network convergence, but has high cost.
In the 5G network construction, due to the shortage of medium-low frequency band spectrum resources, a higher frequency band is selected to enrich spectrum resources, but the higher the frequency is, the larger the loss is, so that the 5G network needs denser base station network arrangement requirements. WDM technology will better exploit the cost advantage in forward access. The passive WDM is standardized in the forward application, and the known WDM optical module has solutions such as CWDM (Coarse WDM, sparse wavelength division multiplexing), MWDM (Medium WDM, Medium wavelength division multiplexing), LWDM (LAN WDM, fine wavelength division multiplexing), DWDM (Dense WDM, Dense optical wave multiplexing), and the like.
The CWDM technology market is mature, but only one station and one path of 5G frequency band service transmission can be realized. The DWDM technology has strict requirements on wavelength drift control, great technical realization difficulty and high cost. The MWDM technology and the LWDM technology are solutions for 5G middle and later stage network development proposed by China Mobile and China telecom respectively.
The density of the 5G network base stations is about 3-5 times of that of 4G, and due to the fact that the multiplexing of 5G network nodes is increased and a passive wavelength division device is used, operation maintenance and problem location of the 5G network are difficult. Therefore, operators urgently need an optical module with a service management function to solve the field application maintenance problem.
Disclosure of Invention
The invention aims to provide an optical module, a method for realizing a network management function of the optical module and optical communication equipment, and aims to solve the problem that management and maintenance are difficult in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a light module, the light module comprising: the device comprises an MCU, a light receiving component and a signal amplifying unit; the MCU comprises a voltage comparator and a communication interface unit;
the output end of the light receiving component is connected with the input end of the signal amplification unit, the output end of the signal amplification unit is connected with the first input end of the voltage comparator, and the output end of the voltage comparator is connected with the input end of the communication interface unit;
the optical receiving component is used for receiving an optical signal carrying service management information, converting the optical signal into an analog voltage signal, performing alternating current coupling and inputting the analog voltage signal to the signal amplifying unit;
the signal amplification unit is used for amplifying the analog voltage signal;
the voltage comparator is used for demodulating a digital signal from the amplified analog voltage signal according to a reference voltage;
and the communication interface unit is used for decoding the digital signal to obtain the service management information.
Optionally, the MCU further includes a CLU clock and data recovery unit, and the output terminal of the voltage comparator is connected to the input terminal of the communication interface unit through the CLU clock and data recovery unit;
the communication interface unit is a serial peripheral interface;
the CLU clock and data recovery unit is used for recovering a clock signal and a data signal from the digital signal coded by the physical layer, and the serial peripheral interface decodes the service management information from the digital signal according to the clock signal and the data signal.
Optionally, the optical module further includes a sampling isolation unit, the MCU further includes an analog-to-digital converter, and an output end of the light receiving component is connected to an input end of the analog-to-digital converter through the sampling isolation unit;
the MCU is used for sampling the signals converted by the analog-to-digital converter so as to monitor the received optical power of the optical receiving component.
Optionally, the optical module further includes a low-pass filter circuit unit;
the output end of the signal amplifying unit is also connected to the second input end of the voltage comparator through the low-pass filter circuit unit;
the voltage comparator is specifically configured to use, as the reference voltage, a dc voltage obtained by passing the dc bias voltage output by the signal amplification unit through the low-pass filter circuit unit.
Optionally, the optical module further includes a light emitting assembly, a driving unit, and a switch selecting unit, and the MCU further includes a coding unit and at least two digital-to-analog converters;
the output end of the coding unit is connected with the first input end of the switch selection unit, the output end of the digital-to-analog converter is connected with the second input end of the switch selection unit, and the output end of the switch selection unit is connected with the input end of the light emitting component through the driving unit;
the coding unit is used for coding a transmitting signal carrying service management information;
the digital-to-analog converter is used for setting the current of the driving unit;
the switch selection unit is used for being conducted with one of the at least two paths of digital-to-analog converters, so that the driving unit works according to the current of the currently conducted digital-to-analog converter;
and the light emitting component is used for converting the transmitting signal subjected to coding modulation into an optical signal and then transmitting the optical signal under the driving of the driving unit.
A method for implementing a network management function of an optical module, where the optical module is as described in any one of the above paragraphs, the method comprising:
the optical receiving component receives an optical signal bearing service management information, converts the optical signal into an analog voltage signal, and amplifies one path of the analog voltage signal after AC coupling;
and the MCU demodulates a digital signal from the amplified analog voltage signal according to the reference voltage, and decodes the digital signal to obtain the service management information.
Optionally, the implementation method further includes:
and the other path of analog voltage signal is processed by a sampling isolation unit and then is directly input into the analog-to-digital converter of the MCU for sampling so as to monitor the received optical power of the optical receiving component.
Optionally, the implementation method further includes: and performing low-pass filtering processing on the other path of amplified analog voltage signal to obtain direct current voltage, and taking the direct current voltage as the reference voltage.
Optionally, the implementation method further includes:
the MCU encodes a transmitting signal bearing service management information and controls the switch selection unit to be conducted with one of the at least two paths of digital-to-analog converters, so that the driving unit works according to the current of the currently conducted digital-to-analog converter;
under the driving of the driving unit, the light emitting component converts the emission signal subjected to code modulation into an optical signal and then emits the optical signal.
An optical communication device comprising a light module as claimed in any of the above.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the optical module of the embodiment of the invention realizes the service management function based on the top-adjusting technology, not only solves the problems of difficult troubleshooting and difficult maintenance of WDM faults, but also has obvious cost advantage because only a single MCU is adopted to realize the coding and decoding functions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an optical module according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an implementation of a set top signal of an optical module according to an embodiment of the present invention;
fig. 3 is a modulation schematic diagram of a tuning signal according to an embodiment of the present invention;
fig. 4 is a structural diagram of a 5G network system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the embodiments of the present invention better understood, 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 obtained by persons of ordinary skill in the art based on the embodiments of the present invention without any creative efforts shall fall within the protection scope of the embodiments of the present invention.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of embodiments of the present invention and the above-described drawings, are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In order to solve the difficult problems of maintenance and management caused by the increase of 5G network node multiplexing and the use of passive wavelength division devices, an embodiment of the present invention provides an optical module with a network management function, which mainly includes: a receiving part for receiving the optical signal carrying the service management information, and a transmitting part for transmitting the optical signal carrying the service management information.
Referring to fig. 1, an optical module according to an embodiment of the present invention mainly includes: the MCU comprises a voltage comparator and a communication interface unit, and the voltage comparator and the communication interface unit form a receiving part of the optical module.
The output end of the light receiving component is connected with the input end of the signal amplification unit, the output end of the signal amplification unit is connected with the first input end of the voltage comparator, and the output end of the voltage comparator is connected with the input end of the communication interface unit;
the optical receiving component is used for receiving an optical signal bearing service management information, converting the optical signal into an analog voltage signal, and inputting the analog voltage signal to the signal amplifying unit after alternating current coupling;
a signal amplification unit for amplifying the analog voltage signal by a magnification factor such as 10 times or 20 times;
the voltage comparator is used for demodulating a digital signal from the amplified analog voltage signal according to the reference voltage;
the communication Interface unit, such as an SPI Interface (Serial Peripheral Interface), is used to decode the digital signal and obtain the service management information.
Based on this, the optical module of the embodiment of the invention realizes the function of receiving and processing the low-frequency amplitude-modulated service management information, and can receive the inquiry and configuration information of a remote end; moreover, the optical module of the embodiment of the invention only adopts 1 MCU to realize the coding and decoding functions, and has the advantages of cost and high cost performance.
When the communication interface unit adopts an SPI interface, the MCU of the embodiment of the present invention may further include a CLU (configurable logic) clock and data recovery unit, since the digital signal obtained by demodulation by the over-voltage comparator still has a certain duty cycle distortion, and the output end of the voltage comparator is connected to the input end of the communication interface unit through the CLU clock and data recovery unit; the CLU clock and data recovery unit is used for recovering a clock signal and a data signal from a digital signal coded by a physical layer and inputting the clock signal and the data signal to the SPI interface, and the SPI interface decodes service management information from the digital signal according to the clock signal and the data signal, so that the problem of duty ratio distortion can be effectively reduced, and the signal quality is improved.
It should be noted that, since the demodulated digital signal needs to meet a certain required dc offset range, the voltage comparator needs to complete demodulation according to a reference voltage, and the reference voltage can be obtained from an external (e.g., an external independent circuit unit). In another preferred embodiment, the reference voltage can also be obtained from the inside, and the specific implementation manner is as follows: the optical module of the embodiment of the invention further comprises a low-pass filter circuit unit, the output end of the signal amplification unit is connected to the second input end of the voltage comparator through the low-pass filter circuit unit, and the voltage comparator takes the direct-current voltage obtained by the direct-current bias voltage output by the signal amplification unit through the low-pass filter circuit unit as the reference voltage, so that better dynamic response speed can be obtained. This may further reduce the duty cycle distortion problem of the signal.
The optical module of the embodiment of the invention also comprises a sampling isolation unit, the MCU also comprises an analog-to-digital converter (shown as ADC in the figure), and the output end of the light receiving component is connected to the input end of the ADC through the sampling isolation unit; the MCU is used for sampling the signal converted by the ADC so as to monitor the received optical power of the optical receiving component. Because noise inside the MCU is easy to interfere with the input signal of the signal amplification unit in the signal sampling process, the sensitivity of the signal amplification unit is reduced, and the signal quality is reduced, the embodiment of the invention adds the sampling isolation unit while realizing received optical power monitoring in the sampling process so as to avoid the interference of the noise inside the MCU on the low-frequency weak signal carried in the input signal of the signal amplification unit.
Referring to fig. 1, the optical module according to the embodiment of the present invention further includes a light emitting module, a driving unit, and a switch selecting unit, and the MCU further includes a coding unit and at least two digital-to-analog converters, where these parts form a transmitting part of the optical module.
The output end of the coding unit is connected with the first input end of the switch selection unit, the output end of the digital-to-analog converter is connected with the second input end of the switch selection unit, and the output end of the switch selection unit is connected with the input end of the light emitting component through the driving unit;
the encoding unit is used for encoding the transmitting signal carrying the service management information;
a digital-to-analog converter for setting a current of the driving unit;
the switch selection unit is used for being conducted with one of the at least two paths of digital-to-analog converters so that the driving unit works according to the current of the currently conducted digital-to-analog converter;
and the light emitting component is used for converting the coded and modulated emission signal into an optical signal and then emitting the optical signal under the driving of the driving unit.
In the embodiment, the driving current is set by selecting the multi-channel digital-to-analog converter in a switching mode, the driving current Sink or Souce mode is supported, and the possible optical power instability factors and deviation influences in the dynamic adjustment process of the DAC can be effectively avoided.
Correspondingly, the embodiment of the present invention further provides a method for implementing a service monitoring management function of an optical module, which is applied to the optical module, and the complete implementation method is as follows:
in the optical signal transmitting direction, the MCU encodes the transmitting information, selects a DAC channel through the IO port control switch selection unit, and uses the DAC to set the current of the driving unit, so as to change the intensity of the output optical power amplitude of the light transmitting component, thereby realizing the low-frequency optical power amplitude modulation function of 3% -5%.
In the optical signal receiving direction, when an optical signal is received by an optical receiving component, a response current is generated, wherein one path of the response current is processed by a sampling isolation unit and then is directly input to an ADC of the MCU for sampling, and the sampling isolation unit is used for monitoring the received optical power; and the other path of the low-frequency amplitude modulation signal is subjected to amplification processing after alternating current coupling, the processed output signal is input to a voltage comparator of the MCU, the voltage comparator takes the direct current voltage which is obtained by low-pass filtering the output signal of the signal amplification unit and has relatively high dynamic speed as a reference voltage, the voltage comparator compares the reference voltage to convert the alternating current signal output by the signal amplification unit into a digital signal to be output, and then the digital signal is input to a CLU clock and data recovery unit to carry out clock and data recovery, and finally the low-frequency amplitude modulation signal is decoded by the SPI communication interface unit.
It should be noted that, as shown in fig. 2, the optical module according to the embodiment of the present invention is based on a set-top technique, and the implementation principle of a set-top signal is shown in fig. 3. In the optical signal receiving direction, the optical signal received by the optical receiving component comprises a high-speed data service and a low-frequency amplitude modulation management data service, after the optical signal is converted into a current signal by the optical receiving component, the high-speed data service part is converted into a voltage signal after being amplified by a transimpedance amplifier (TIA), and the voltage signal is input into a Limiting Amplifier (LA) after being subjected to alternating current coupling and is processed into a digital signal with equal amplitude to be output; the other path of the current is output through a transimpedance amplifier mirror image detection current (RSSI), converted into a voltage signal through a pull-down resistor, input into a signal amplification unit after alternating current coupling, and amplified by the signal amplification unit, and the follow-up process is as described above and is not repeated.
It is understood that the optical module of the present invention may be applied to various optical communication devices, such as an AAU (Active Antenna Unit) device and a BBU (Building Base band Unit) device. Since the optical module of this embodiment adds a service management function of low-frequency amplitude modulation, when applied to the network system shown in fig. 4, it is possible to query and configure relevant information of a corresponding module on the far-end AAU device through the near-end active WDM device, and determine whether the module is abnormal, without the need of manually confirming the state of the optical module at the AAU device end on the base station as in the conventional case, which is more convenient and safer to maintain.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A light module, characterized in that the light module comprises: the device comprises an MCU, a light receiving component and a signal amplifying unit; the MCU comprises a voltage comparator and a communication interface unit;
the output end of the light receiving component is connected with the input end of the signal amplification unit, the output end of the signal amplification unit is connected with the first input end of the voltage comparator, and the output end of the voltage comparator is connected with the input end of the communication interface unit;
the optical receiving component is used for receiving an optical signal carrying service management information, converting the optical signal into an analog voltage signal, performing alternating current coupling and inputting the analog voltage signal to the signal amplifying unit;
the signal amplification unit is used for amplifying the analog voltage signal;
the voltage comparator is used for demodulating a digital signal from the amplified analog voltage signal according to a reference voltage;
and the communication interface unit is used for decoding the digital signal to obtain the service management information.
2. The optical module of claim 1, wherein the MCU further comprises a configurable logic CLU clock and data recovery unit, wherein the output of the voltage comparator is connected to the input of the communication interface unit through the CLU clock and data recovery unit;
the communication interface unit is a serial peripheral interface;
the CLU clock and data recovery unit is used for recovering a clock signal and a data signal from the digital signal coded by the physical layer, and the serial peripheral interface decodes the service management information from the digital signal according to the clock signal and the data signal.
3. The optical module according to claim 1, wherein the optical module further comprises a sampling isolation unit, the MCU further comprises an analog-to-digital converter, and the output terminal of the light receiving component is connected to the input terminal of the analog-to-digital converter through the sampling isolation unit;
the MCU is used for sampling the signals converted by the analog-to-digital converter so as to monitor the received optical power of the optical receiving component.
4. The optical module according to claim 1, characterized in that the optical module further comprises a low pass filter circuit unit;
the output end of the signal amplifying unit is also connected to the second input end of the voltage comparator through the low-pass filter circuit unit;
the voltage comparator is specifically configured to use, as the reference voltage, a dc voltage obtained by passing the dc bias voltage output by the signal amplification unit through the low-pass filter circuit unit.
5. The optical module according to claim 1, wherein the optical module further comprises a light emitting module, a driving unit and a switch selection unit, and the MCU further comprises a coding unit and at least two paths of digital-to-analog converters;
the output end of the coding unit is connected with the first input end of the switch selection unit, the output end of the digital-to-analog converter is connected with the second input end of the switch selection unit, and the output end of the switch selection unit is connected with the input end of the light emitting component through the driving unit;
the coding unit is used for coding a transmitting signal carrying service management information;
the digital-to-analog converter is used for setting the current of the driving unit;
the switch selection unit is used for being conducted with one of the at least two paths of digital-to-analog converters, so that the driving unit works according to the current of the currently conducted digital-to-analog converter;
and the light emitting component is used for converting the transmitting signal subjected to coding modulation into an optical signal and then transmitting the optical signal under the driving of the driving unit.
6. A method for implementing a network management function of an optical module, wherein the optical module is as claimed in any one of claims 1 to 5, the method comprising:
the optical receiving component receives an optical signal bearing service management information, converts the optical signal into an analog voltage signal, and amplifies one path of the analog voltage signal after AC coupling;
and the MCU demodulates a digital signal from the amplified analog voltage signal according to the reference voltage, and decodes the digital signal to obtain the service management information.
7. The method for implementing the network management function of the optical module according to claim 6, further comprising:
and the other path of analog voltage signal is processed by a sampling isolation unit and then is directly input into the analog-to-digital converter of the MCU for sampling so as to monitor the received optical power of the optical receiving component.
8. The method for implementing the network management function of the optical module according to claim 6, further comprising: and performing low-pass filtering processing on the other path of amplified analog voltage signal to obtain direct current voltage, and taking the direct current voltage as the reference voltage.
9. The method for implementing the network management function of the optical module according to claim 6, further comprising:
the MCU encodes a transmitting signal bearing service management information and controls the switch selection unit to be conducted with one of the at least two paths of digital-to-analog converters, so that the driving unit works according to the current of the currently conducted digital-to-analog converter;
under the driving of the driving unit, the light emitting component converts the emission signal subjected to code modulation into an optical signal and then emits the optical signal.
10. An optical communication device characterized by comprising a light module according to any one of claims 1 to 5.
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