CN109495170B - Received signal monitoring method for optical module, optical module and optical line terminal - Google Patents
Received signal monitoring method for optical module, optical module and optical line terminal Download PDFInfo
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- H—ELECTRICITY
- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- 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 disclosure relates to a received signal monitoring method for an optical module, the optical module and an optical line terminal. The method comprises the following steps: receiving a monitoring trigger signal; according to the monitoring trigger signal, carrying out sampling and holding on a receiving signal of the optical module to generate a sampling and holding signal, and carrying out time delay on the monitoring trigger signal for a preset time period to obtain the delayed monitoring trigger signal; and carrying out analog-to-digital conversion sampling on the sampling hold signal according to the delayed monitoring trigger signal. In the method, the monitoring trigger signal triggering the ADC sampling is delayed, so that the ADC sampling starts to sample at the fixed time point of the sampling hold signal, the sampling precision deviation caused by inconsistent sampling starting time points does not exist, and the monitoring precision of the received optical power is improved.
Description
Technical Field
The present disclosure relates to the field of optical communications, and in particular, to a received signal monitoring method for an optical module, and an optical line terminal.
Background
With the continuous development of Optical communication technology and the breakthrough of Optical fiber technology, emerging technologies such as Ethernet Passive Optical Network (EPON) and Gigabit-Capable Passive Optical Network (GPON) are emerging due to the emergence of Passive Optical Network (PON) architecture technology and the application of Ethernet technology. The emergence of these new technologies makes the optical communication technology enter thousands of households, and more people enjoy the welfare brought by the development of science and technology.
In the implementation of the prior art, an Optical Line Terminal (OLT) is an important component in an architecture network based on the PON technology, and an Optical module in the OLT plays an essential role in implementing a plurality of Optical communication technologies including the PON, EPON, and GPON technologies. Some optical modules have a function of monitoring received signal power, wherein the optical modules convert received optical signals into electrical signals and sample the electrical signals through a sample-and-hold circuit to output sample-and-hold signals, and a single chip microcomputer of the optical modules performs analog-to-digital conversion (ADC) sampling on the sample-and-hold signals to obtain power indication values of the received signals. Generally, an OLT (e.g., a MAC chip of the OLT) sends a trigger signal to an optical module, where the trigger signal triggers a sample-and-hold circuit of the optical module to sample-and-hold a received signal to generate a sample-and-hold signal and triggers a single chip to ADC sample the sample-and-hold signal. Because the time from the time when the trigger signal enters the single chip microcomputer to the time when the single chip microcomputer starts sampling is not fixed (during the time, the single chip microcomputer may need to complete necessary interface configuration and then start sampling), and the value of the sampling holding signal output by the sampling holding circuit is gradually reduced at the stage of starting discharging due to the gradual discharging of the sampling holding circuit, the sampling value obtained by the single chip microcomputer starting ADC sampling at the unfixed time is deviated, and the monitoring precision of the received optical power, especially the precision of the small light is influenced.
Disclosure of Invention
The purpose of the present disclosure is to provide a received signal monitoring method for an optical module, an optical module and an optical line terminal.
According to an aspect of the present disclosure, there is provided a received signal monitoring method for an optical module, the method including:
receiving a monitoring trigger signal;
according to the monitoring trigger signal, carrying out sampling and holding on a receiving signal of the optical module to generate a sampling and holding signal, and carrying out time delay on the monitoring trigger signal for a preset time period to obtain the delayed monitoring trigger signal;
and carrying out analog-to-digital conversion sampling on the sampling hold signal according to the delayed monitoring trigger signal.
According to another aspect of the present disclosure, there is provided a light module including:
a sample-and-hold module configured to: sampling and holding a receiving signal of an optical module under the trigger of a monitoring trigger signal to generate a sampling and holding signal;
a delay module configured to: delaying the monitoring trigger signal for a preset time period to obtain the delayed monitoring trigger signal;
an analog-to-digital conversion module configured to: and according to the delayed monitoring trigger signal, performing analog-to-digital conversion sampling on the sample-hold signal generated by the sample-hold module.
According to a third aspect of the present disclosure, there is provided an optical line terminal comprising the optical module as described above.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
in each embodiment of the disclosure, the monitoring trigger signal triggering the ADC sampling is delayed, so that the ADC sampling starts at the fixed time point of the sample hold signal, and thus, there is no sampling precision deviation caused by inconsistent sampling start time points, and the monitoring precision of the received optical power, especially the precision of the small light, is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a timing diagram illustrating a trigger signal and an ADC sample signal in the prior art according to an exemplary embodiment;
fig. 2 is a schematic diagram illustrating an implementation environment of a received signal monitoring method for an optical module according to an exemplary embodiment;
fig. 3 is a schematic diagram illustrating a received signal monitoring method for an optical module according to an exemplary embodiment;
fig. 4 is a timing diagram illustrating a trigger signal and an ADC sampling signal employing a received signal monitoring method for an optical module according to an exemplary embodiment;
FIG. 5 is a schematic block diagram illustrating a light module in accordance with an exemplary embodiment;
fig. 6 is a schematic block diagram of a light module shown according to another exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.
In the prior art, an external board card in the OLT generates a trigger signal and sends the trigger signal to a micro control unit and a sample and hold module in an optical module, at this time, the sample and hold module immediately samples and holds an electrical signal sent by an optical device and outputs a sample and hold signal, and meanwhile, the micro control unit also receives the trigger signal and sends an indication signal to an Analog-to-Digital Converter (ADC) according to the trigger signal. Therefore, the analog-to-digital conversion module can perform analog-to-digital conversion on the sampling and holding signal output by the sampling and holding module, output a digital signal and send the digital signal to the micro control unit, and the micro control unit processes the digital signal to obtain the optical power of the optical signal received by the optical device. FIG. 1 is a timing diagram illustrating a trigger signal and an ADC sample signal in the prior art according to an example embodiment. As shown in fig. 1, W1 is a waveform diagram of the trigger signal in time sequence, and it can be seen that W1 is a square wave, which has a rising edge and a falling edge at a specific time, the sample-and-hold module can start to sample the received signal of the optical module according to the trigger signal W1 to generate a sample-and-hold signal, and the micro control unit can send an indication signal to the analog-to-digital conversion module according to the trigger signal W1 to indicate the analog-to-digital conversion module to start to perform analog-to-digital conversion on the sample-and-hold signal of the sample-and; w2 is a schematic diagram of the signal sampled by the analog-to-digital conversion module, and S1 is a schematic diagram of sampling, it can be understood that, in the embodiment shown in fig. 1, the mcu can send an indication signal to the analog-to-digital conversion module according to the trigger signal W1, and the sample-and-hold module starts sampling the received signal of the optical module according to the trigger signal W1, which are both started sampling according to the rising edge of the trigger signal W1. However, it can be seen that in the embodiment shown in fig. 1, in the prior art, the signal W2 sampled by the analog-to-digital conversion module, i.e. the sample-and-hold signal output by the sample-and-hold module according to the trigger of the trigger signal W1, requires a charging process from the enabled state to the normal output state of the sample-and-hold module, so that the signal W2 sampled by the analog-to-digital conversion module is unstable, the waveform thereof changes more sharply, the digital signal converted by the analog-to-digital conversion module has a deviation, and the monitoring accuracy of the received optical power, especially the accuracy of the small light, is affected.
The prior art can only guarantee the accuracy of the optical power under ideal conditions, and the accuracy of the optical power is too low if the prior art is used in practical application. In particular, on the one hand, since the mcu has multiple interfaces, when the mcu receives the trigger signal, the mcu may be performing configuration processing on other interfaces, and the asynchronous execution capability of the micro control unit is limited, and the processing of other interfaces can not be finished immediately, so that the micro control unit can not send an indication signal to the analog-to-digital conversion module in time, the analog-to-digital conversion module can not obtain the indication signal sent by the micro control unit in time, and the analog-to-digital conversion of the sample and hold signal output by the sample and hold module can not be started immediately, so that a larger time difference exists between the trigger signal received by the micro control unit and the digital signal received by the micro control unit and output by the analog-to-digital conversion module, moreover, the time difference is not fixed due to different numbers and types of interfaces required to be configured by the micro control unit; on the other hand, because the circuit in the sample-and-hold module has components such as a capacitor, the charging and discharging of the circuit in the sample-and-hold module needs to consume a certain time, however, the sample-and-hold module can accurately sample the optical device only at a high level, and during the high-low level conversion period, namely during the charging and discharging of the circuit, the error of the collected signal is large at this time due to the fluctuation of the electric signal. Therefore, if the micro control unit sends indication information to the analog-to-digital conversion module when the circuit in the sample-and-hold module is charged and discharged, and the indication analog-to-digital conversion module receives the sample-and-hold signal output by the sample-and-hold module, an error occurs in each link from the sample-and-hold module, and finally the accuracy and precision of the optical power monitored by the optical module are low.
Fig. 2 is a schematic diagram illustrating an implementation environment of a received signal monitoring method for an optical module according to an exemplary embodiment. As shown in fig. 2, the optical module 270 includes: when the optical module 270 receives an optical signal, and a photoelectric conversion device (not shown) inside the optical module 270 converts the received optical signal into an electrical signal 280, that is, the electrical signal 280 is sent to the sample-and-hold module 260, the external board 210 generates a monitoring trigger signal 220 and sends the monitoring trigger signal 220 to the sample-and-hold module 260 and the micro-control unit 240, but the monitoring trigger signal 220 sent to the micro-control unit 240 is delayed by the implementation terminal of the present disclosure, so that the delayed monitoring trigger signal 230 is obtained, and the micro-control unit 240 included in the optical module 270 actually receives the delayed monitoring trigger signal 230.
It should be understood that there is no obvious physical boundary between the micro control unit 240, the analog-to-digital conversion module 250 and the sample-and-hold module 260, and only three components with different functions are manually defined, so that the representation is only for better describing the technical solution of the present disclosure; the actual implementation of the three components can also be varied according to the actual application and the understanding of the different people: the micro control unit 240 and the analog-to-digital conversion module 250 are actually micro control units integrating analog-to-digital conversion functions, and the analog-to-digital conversion module 250 and the sample-and-hold module 260 are actually an integral module integrating functions of the two modules, and so on.
It should be noted that fig. 2 is only one embodiment of the present disclosure, and in the embodiment shown in fig. 2, an implementation terminal that performs delay on the monitoring trigger signal 220 in the present disclosure is located outside the optical module, but in practical application, the delay on the monitoring trigger signal 220 may be implemented outside the optical module, and may also be implemented inside the optical module — implemented by the optical module itself; in addition, in the embodiment shown in fig. 2, the external board 210 generates two monitoring trigger signals 220, and respectively sends the two monitoring trigger signals to the sample-and-hold module 260 and the micro-control unit 240 at the same time, but in an actual scenario, the external board 210 may also generate one monitoring trigger signal 220 and send the one monitoring trigger signal 220 to the implementation terminal of the present disclosure, and then the implementation terminal of the present disclosure immediately sends the monitoring trigger signal 220 to the sample-and-hold module 260 after receiving the monitoring trigger signal 220, delays the monitoring trigger signal 220 to obtain the delayed monitoring trigger signal 230, and then sends the delayed monitoring trigger signal 230 to the micro-control unit 240. Therefore, the specific implementation position of the technical solution of the present disclosure and the transmission manner of the trigger signal are not limited in this respect, and the protection scope of the present disclosure should not be limited thereby.
One or more of the embodiments of the present disclosure make use of this point ingeniously, by sending a monitoring trigger signal to the sample-and-hold module after receiving the trigger signal, and delaying the monitoring trigger signal for a predetermined period of time to obtain the delayed monitoring trigger signal and sending the delayed monitoring trigger signal to the micro control unit, during the charging and discharging period of the sample-and-hold module and during the configuration period of the micro control unit for other interfaces, the analog-to-digital conversion module does not perform analog-to-digital conversion on the sample-and-hold signal that cannot objectively reflect the signal received by the optical module and is generated by the charging and discharging of the sample-and-hold module, and the micro control unit does not receive the digital signal with a large error output by the analog-to-digital conversion module, and does not output the optical power with a low accuracy.
The present disclosure first provides a received signal monitoring method for an optical module. The "reception signal of the optical module" in the present disclosure refers to a signal obtained by photoelectrically converting a light signal received by the optical module. The received signal of the optical module may be an analog signal such as current and voltage. For the optical module, the method used in the present disclosure can play a role in monitoring the received signal of the optical module.
Fig. 3 is a schematic diagram illustrating a received signal monitoring method for an optical module according to an exemplary embodiment. As shown in fig. 3, the method comprises the following steps:
The monitor trigger signal is a level signal having a timing corresponding to the optical signal, and specifically, the waveform thereof may be a square wave, a pulse wave, or the like. It should be noted that receiving the monitoring trigger signal does not mean that the implementing terminal of the present invention is provided with a signal receiving component alone, but may be passively receiving signals by means of pins, circuits, etc. of the implementing terminal of the present invention.
After the trigger signal enters the sample-and-hold module of the optical module, the logic gate at a specific position of a circuit in the module can be switched on, so that the sample-and-hold operation can be performed on the received signal of the optical module, and finally the sample-and-hold signal is output.
In one embodiment, the implementing terminal of the present disclosure that receives the monitoring trigger signal is the optical module itself.
In one embodiment, the optical module is a part of the implementing terminal of the present disclosure, and the unit receiving the monitoring trigger signal belongs to the implementing terminal of the present disclosure, but is located outside the optical module.
The specific way of sampling and holding the received signal of the optical module may be that a sample-and-hold circuit inside the optical module realizes sampling and holding of the received signal of the optical module, or that an assembly with a sample-and-hold module contained inside the optical module realizes sampling and holding of the received signal of the optical module. Specifically, the optical module itself or a component inside the optical module performs sample hold on the received signal of the optical module, which is not limited in any way by the present disclosure.
In one embodiment, the optical module comprises a sample-and-hold module that starts sample-and-hold on triggering of a trigger edge of the monitoring trigger signal, and samples during a high level of the monitoring trigger signal and holds a sample value during a low level thereof, thereby generating a sample-and-hold signal.
In an embodiment, the optical module is an implementation terminal of the present disclosure, and the optical module itself or a component thereof may receive a monitoring trigger signal and complete a function of performing sample-and-hold on a received signal of the optical module and generating a sample-and-hold signal according to the monitoring trigger signal.
In one embodiment, the implementation terminal of the present disclosure is a larger device or system including an optical module, and after receiving the monitoring trigger signal, the implementation terminal of the present disclosure completely sends the monitoring trigger signal to the optical module belonging to the implementation terminal of the present disclosure, so that the optical module performs sample-and-hold on a received signal of the optical module according to the monitoring trigger signal to generate a sample-and-hold signal.
In one embodiment of the present disclosure, delaying a monitor trigger signal by a predetermined period of time is performed by delaying a trigger edge of the monitor trigger signal by a predetermined period of time chronologically back.
In another embodiment of the present disclosure, delaying the monitoring trigger signal by a predetermined time period is delaying the waveform of the monitoring trigger signal by a predetermined time period in time overall.
The trigger edge may be a rising or falling edge of the trigger signal.
In another embodiment of the present disclosure, delaying the monitor trigger signal for a predetermined period of time is achieved by regenerating another monitor trigger signal having the same waveform as the monitor trigger signal after generating the monitor trigger signal for the predetermined period of time.
In one embodiment, the light module comprises a micro control unit, the predetermined time period is greater than or equal to a first time period, and the first time period is a time period required by the micro control unit to complete necessary interface configuration processing.
In one embodiment, the interface configuration time of the micro-control unit is also a factor to consider for delaying the trigger signal. If the micro control unit is performing interface configuration when sending the trigger signal to the micro control unit, the micro control unit is likely not able to monitor the trigger signal in time, so that the optical module is likely not able to start analog-to-digital conversion on the sample hold signal according to the delayed monitor trigger signal.
In one embodiment, the light module comprises a micro control unit and a sample-and-hold module, the predetermined time period is greater than or equal to a first time period and is also greater than or equal to a second time period, the first time period is a time period required by the micro control unit to complete necessary interface configuration processing, and the second time period is a charging time of the sample-and-hold module.
In one embodiment, the optical module includes a micro control unit and a sample-and-hold module, the predetermined time period is greater than or equal to a first time period and is also greater than or equal to a second time period, and the predetermined time period is also less than a third time period, the first time period is a time period required by the micro control unit to complete necessary interface configuration processing, the second time period is a charging time of the sample-and-hold module, and the third time period is a time period between the start of charging and the start of discharging of the sample-and-hold module.
In one embodiment, the delay of the monitoring trigger signal is implemented by software fixed in the micro control unit of the light module.
In one embodiment, the delay of the monitoring trigger signal is realized by a delay circuit external to the optical module.
In one embodiment, the implementation terminal of the present disclosure receives all monitoring trigger signals, delays the monitoring trigger signals sent to the micro control unit, and sends the non-delayed monitoring trigger signals to the sample-and-hold module.
In one embodiment, the implementation terminal of the present disclosure only receives the monitoring trigger signal sent to the micro control unit, and delays the monitoring trigger signal.
It should be understood that the implementation terminal of the present disclosure may be any unit or component that can perform the above method, such as a micro control unit, a single chip, a delay circuit, an optical module itself, and the like.
And 330, performing analog-to-digital conversion sampling on the sample-hold signal according to the delayed monitoring trigger signal.
The analog-to-digital conversion sampling starts under the trigger of the delayed trigger edge of the monitoring trigger signal, and the delayed monitoring trigger signal is obtained by delaying the monitoring trigger signal, so that the real starting time of the analog-to-digital conversion sampling is always fixed time, namely the sampling is started at a certain fixed time point of the time sequence of the sampling and holding signal, and the sampling and holding signal which is generated during the charging and discharging of the sampling and holding module and cannot objectively reflect the receiving signal of the optical module can not be subjected to the analog-to-digital conversion sampling.
Fig. 4 is a timing diagram illustrating a trigger signal and an ADC sampling signal using a received signal monitoring method for an optical module according to an exemplary embodiment. As shown in figure 4 of the drawings,
l1 is a waveform diagram of the monitoring trigger signal in time sequence, it can be seen that L1 is a square wave having a rising edge and a falling edge at a specific time, and the sample-and-hold module can start sampling the received signal of the optical module according to the monitoring trigger signal L1 to generate a sample-and-hold signal. After the method for monitoring the received signal of the optical module provided by the present disclosure is used, the monitoring trigger signal L1 is delayed by a time length T1, and the delayed monitoring trigger signal L1' is obtained. L2 is a schematic diagram of the signal sampled by the analog-to-digital conversion module, C1 is a schematic diagram of the sampling of the mcu in the case of receiving the monitor trigger signal L1 without being delayed, and C2 is a schematic diagram of the sampling of the mcu in the case of receiving the monitor trigger signal L1' delayed by a delay time of time T1. It can be seen that in the embodiment shown in fig. 4, the sample-and-hold module starts to sample and hold according to the falling edge of the monitoring trigger signal L1, and the micro-control unit also sends an indication signal to the analog-to-digital conversion module according to the delayed monitoring trigger signal L1', so that the analog-to-digital conversion module starts to sample the sample-and-hold signal by analog-to-digital conversion. Therefore, under the condition that the monitoring trigger signal received by the micro control unit is not delayed, the signal L2 sampled by the analog-to-digital conversion module is unstable, and the waveform change thereof is large, so that the digital signal converted by the analog-to-digital conversion module has a deviation, which affects the monitoring precision of the received optical power, especially the precision of the small light; when the micro control unit receives the delayed monitoring trigger signal, because the charging of the sample-and-hold module is basically finished and the interface configuration of the micro control unit is basically finished, the signal L2 sampled by the analog-to-digital conversion module is more stable, the conversion error of the analog-to-digital conversion module is reduced, and the monitoring precision of the optical power is improved.
The present disclosure also provides an optical module. FIG. 5 is a schematic block diagram illustrating a light module in accordance with an exemplary embodiment. As shown in fig. 5, the optical module 500 includes:
a sample-and-hold module 510 configured to: and sampling and holding the received signal of the optical module under the trigger of the monitoring trigger signal to generate a sampling and holding signal.
A delay module 520 configured to: and delaying the monitoring trigger signal for a preset time period to obtain the delayed monitoring trigger signal.
An analog-to-digital conversion module 530 configured to: and according to the delayed monitoring trigger signal, performing analog-to-digital conversion sampling on the sample-hold signal generated by the sample-hold module.
In one embodiment, the light module 500 shown in fig. 5 further comprises a micro control unit. Fig. 6 is a schematic block diagram illustrating a light module according to another exemplary embodiment, as shown in fig. 6, the light module 500 further comprises a micro control unit 540 configured to: and receiving the delayed monitoring trigger signal, and sending an indication signal to the analog-to-digital conversion module under the trigger of the delayed monitoring trigger signal, so that the analog-to-digital conversion module starts to perform analog-to-digital conversion sampling on the sample-hold signal under the indication of the indication signal.
In one embodiment, the predetermined time period delayed by the delay module 520 is greater than or equal to a first time period required for the micro control unit to complete the necessary interface configuration process.
In one embodiment, the predetermined time period delayed by the delay module 520 is greater than or equal to a first time period required for the micro control unit to complete the necessary interface configuration process and is also greater than or equal to a second time period which is the charging time of the sample and hold module.
In one embodiment, the predetermined time period delayed by the delay module 520 is greater than or equal to a first time period required for the micro control unit to complete the necessary interface configuration process, and is also greater than or equal to a second time period, which is the charging time of the sample-and-hold module, and is also less than a third time period, which is the time period between the start of charging and the start of discharging the sample-and-hold module.
It should be noted that the micro control unit may include, but is not limited to, any unit or component having operation and processing functions, such as a single chip, a microprocessor, a microcontroller, and the like.
Other aspects of the optical module, such as the relationship between signal transmission and conversion of each unit in the optical module, have been described above, and they are also applicable to the embodiment of the optical module and the following embodiment of the optical line terminal including the optical module, and are not described herein again.
According to a third aspect of the present disclosure, there is also provided an optical line terminal including the optical module as described above.
The optical module, the implementation terminal and the optical line terminal in the above embodiments may be implemented by hardware, software, or firmware, or a combination thereof, and may also be implemented as a single device; the optical module, the implementing terminal of the present invention, and the unit/module in the optical line terminal may be a single circuit, or may be an integrated unit/module that is combined by a plurality of components including circuits and executes corresponding functions, where the hardware, software, or firmware and their combination are separated or have specifically connected hardware components, a functional module implemented by a programming manner, a hardware component implemented by a circuit, a functional module implemented by a programmable logic device, and so on.
Furthermore, the above-described figures are merely schematic illustrations of processes involved in methods according to exemplary embodiments of the invention, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A method for received signal monitoring of an optical module, the method comprising:
receiving a monitoring trigger signal;
according to the monitoring trigger signal, carrying out sampling and holding on a receiving signal of the optical module to generate a sampling and holding signal, and carrying out time delay on the monitoring trigger signal for a preset time period to obtain the delayed monitoring trigger signal;
and carrying out analog-to-digital conversion sampling on the sampling hold signal according to the delayed monitoring trigger signal.
2. The method according to claim 1, characterized in that said light module comprises a micro control unit, said predetermined period of time being greater than or equal to a first period of time, said first period of time being a period of time required for said micro control unit to complete a necessary interface configuration process.
3. The method of claim 2, wherein the light module further comprises a sample and hold module, wherein the predetermined period of time is further greater than or equal to a second period of time, wherein the second period of time is a charging time of the sample and hold module.
4. The method of claim 3, wherein the predetermined time period is further less than a third time period, the third time period being a time period between the start of charging and the start of discharging of the sample and hold module.
5. A light module, comprising:
a sample-and-hold module configured to: sampling and holding a receiving signal of an optical module under the trigger of a monitoring trigger signal to generate a sampling and holding signal;
a delay module configured to: delaying the monitoring trigger signal for a preset time period to obtain the delayed monitoring trigger signal;
an analog-to-digital conversion module configured to: and according to the delayed monitoring trigger signal, performing analog-to-digital conversion sampling on the sample-hold signal generated by the sample-hold module.
6. The light module of claim 5, further comprising a micro control unit configured to: and receiving the delayed monitoring trigger signal, and sending an indication signal to the analog-to-digital conversion module under the trigger of the delayed monitoring trigger signal, so that the analog-to-digital conversion module starts to perform analog-to-digital conversion sampling on the sample-hold signal under the indication of the indication signal.
7. The light module according to claim 6, characterized in that the predetermined period of time is greater than or equal to a first period of time required for the micro control unit to complete the necessary interface configuration process.
8. The light module of claim 7, wherein the predetermined period of time is also greater than or equal to a second period of time, the second period of time being a charge time of the sample-and-hold module.
9. The light module according to claim 7 or 8, characterized in that the predetermined time period is also smaller than a third time period, which is a time period between the start of charging and the start of discharging of the sample-and-hold module.
10. An optical line terminal, characterized in that it comprises an optical module according to any of claims 5-9.
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| CN108900243B (en) * | 2018-06-28 | 2021-06-04 | 青岛海信宽带多媒体技术有限公司 | Method and device for sampling ONU equipment state information and optical line terminal |
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| CN101510802A (en) * | 2008-12-16 | 2009-08-19 | 成都优博创技术有限公司 | Circuit for measuring outburst mode optical signal power |
| CN102255656A (en) * | 2011-06-16 | 2011-11-23 | 成都新易盛通信技术有限公司 | Optical network unit for passive optical network and signal processing method thereof |
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