WO2009065364A1

WO2009065364A1 - A method and device and communication system for measuring optical power

Info

Publication number: WO2009065364A1
Application number: PCT/CN2008/073178
Authority: WO
Inventors: Sulin Yang; Jinrong Yin; Zhiguang Xu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-11-24
Filing date: 2008-11-24
Publication date: 2009-05-28

Abstract

An optical power measuring method, involves: acquiring code type information in an optical signal of a communication system, the optical signal includes: the optical signal of burst emission and/or the optical signal of burst reception; measuring the optical signal of the communication system, acquiring the optical power value of the optical signal; correcting the optical power value according to the code type information. An optical power measuring device, involves: an acquirement module, for acquiring code type information in an optical signal of a communication system, thereof, the code type information is obtained through counting the electricity signal, which is derived from a conversion of the optical signal from the device at sending end, or according to the report from the device at sending end; a power measurement module, for measuring the electricity signal which is derived from a conversion of the optical signal, to obtain the optical power value; a process module, for correcting the optical power value according to the code type information.

Description

Method and device for measuring optical power and communication system

This application claims priority to Chinese Patent Application No. 200810215052.5, entitled "A Method and Apparatus for Measuring Optical Power", filed on September 4, 2008, and filed on November 24, 2007. The priority of the Chinese Patent Application No. 200710077418.2, entitled "A Method and Apparatus for Measuring Optical Power", is hereby incorporated by reference.

Technical field

The present invention relates to the field of fiber access, and in particular to a method and apparatus for measuring optical power. Background technique

Passive Optical Network (PON) technology is a point-to-multipoint fiber access technology. As shown in Figure 1, the passive optical network (P0N) consists of the optical line terminal (OTLT). The terminal is composed of an ONU (Optical Network Unit) and an Optical Distribute Network (ODN). Generally, TDM (Time Division Multiplexing) broadcast mode is adopted for downlink, and TDMA (Time Division Multiple Access) is adopted for uplink. The so-called "passive" means that the 0DN does not contain any active electronic devices and electronic power supplies, all of which are composed of passive components such as optical splitters, so the cost of management and maintenance is low.

In fiber optic systems, the optical power is usually used to represent the intensity of the optical signal in units of earned (milliwatts). At the same time, since the power of the optical signal is relatively small in optical communication, the optical power is also commonly used in dBm, and 1 earns 0 dBm. The optical power measuring device is connected to the system to be tested, and performs amplification, sampling, analog-to-digital conversion and the like on the signal to be measured. The optical power measuring device can usually obtain only the average value in one piece of data, that is, the average optical power measurement. The average optical power measurement is the average of the optical signal strengths corresponding to the "0" signal and the "1" signal over a period of time. In the P0N system, since the zero volume can only transmit the uplink data in the time slot allocated by the 0LT according to the TDMA method, that is, the burst transmission, this will cause the 0, 1 distribution of the data transmitted by the ONU to change constantly, which leads to The measured average burst optical power and/or average burst received optical power are constantly changing. At the same time, when measuring the optical signal intensity passing through a section of optical fiber, events such as bending and aging of the optical fiber at 0DN may also cause measurement results to change. Thus, when the measurement result changes, it is impossible to determine whether the change is caused by a change in the distribution of the measured signal, or whether the fiber is bent or aged on the 0DN, that is, the optical fiber on the 0DN cannot be identified by the measured optical power. Bending, aging, etc.

SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a method and apparatus for measuring optical power to solve the problem that the prior art cannot identify the faults such as bending and aging of the optical fiber on the 0DN by the measured optical power.

In view of this, the embodiments of the present invention provide:

(same as the independent claim, to be filled after review)

The invention corrects the measured optical power by acquiring the pattern information of the optical signal of the tested communication system.

The problem of eliminating the influence of the distribution change of the optical signal pattern information on the measurement result, so that when the optical power measured by the invention has a large change, the abnormal event occurring on the 0DN can be confirmed, which provides a fault location for the network. More precise input.

DRAWINGS

Figure 1 is a schematic structural diagram of a P0N system;

2 is a diagram of an optical power measuring apparatus according to an embodiment of the present invention;

3 is a structural diagram of a receiving end device according to an embodiment of the present invention;

4 is a schematic view of a first embodiment of the present invention; FIG. 5 is a schematic diagram of Embodiment 2 of the present invention.

detailed description

The embodiment of the present invention is directed to an optical signal on a P0N network, that is, a burst mode optical signal, taking the binary representation of the digital optical signal as an example, by distributing the average optical power while distributing the pattern information of the optical signal to be measured, that is, “0” The distribution of the signal and/or "1" signal is statistically corrected, and the measured average optical power value is corrected to obtain the corrected optical power value, eliminating the distribution of the "0" signal and/or the "1" signal in the optical signal. Bow) The factors that cause fluctuations in optical power measurements to identify and determine faults occurring on the 0DN.

As shown in FIG. 2, an embodiment of the present invention provides an optical power measurement apparatus, where the optical power measurement apparatus includes: an acquisition module, a power measurement module, and a processing module; wherein, the acquisition module is configured to collect an optical signal of the communication system. The pattern information, that is, the pattern information in the electrical signal after the optical signal is converted; the power measurement module is configured to measure the optical power value of the optical signal corresponding to the communication system, that is, the electrical signal after the optical signal is converted, Obtaining an optical power value; and processing a module, configured to correct the optical power value according to the pattern information. The pattern information includes: a duty ratio of the optical signal, and/or a "0" signal and a "1" signal distribution in the optical signal. The acquisition module can be located at the transmitting device and/or at the receiving device.

The optical power measuring device further includes a control module, an optical signal receiving module, and a recovery module. The control module is configured to control the collecting module and the data measuring module to enable the collecting of the collecting module and the power measurement. The measurement of the module is for the optical signal in the same period of time, ie for the same optical signal. The optical signal receiving module is configured to receive an optical signal on the P0N network, and convert the optical signal into an electrical signal and send the signal to the recovery module and the power measurement module. The recovery module is configured to output according to the optical signal receiving module. The electrical signal recovers the data in the electrical signal for normal service. When the collection module is located at the receiving end device, as shown in FIG. 3, the receiving end device includes: an obtaining module, a power measuring module, and a processing module; wherein, the acquiring module is configured to receive a code from the transmitting end device. The type information, that is, the received pattern information obtained by the transmitting device for collecting the optical signal; the power measuring module, configured to measure the optical power value of the corresponding optical signal of the communication system, that is, the electrical signal after the optical signal is converted, Obtaining an optical power value; and processing a module, configured to correct the optical power value according to the pattern information. The pattern information includes: a duty ratio of the optical signal, and/or a "0" signal and a "1" signal distribution in the optical signal.

The transmitting device may perform line coding or agitation processing on the data before transmitting the data, and then transmitting the data through the electro-optical conversion. Therefore, the transmitting device may acquire the signal to be transmitted before or after processing the data such as line coding or agitation. The distribution of the duty cycle and / or "0" signal and the "1" signal is sent to the receiving device. Since the uplink signal is bursty, that is, the transmission of the zero-order uplink signal is intermittent, the acquisition result is sent to the receiving device, and there are two cases: 1. The result of the acquisition of the burst uplink signal is placed. The end of this burst uplink signal. In this way, the acquisition result can be transmitted to the receiving end in real time, so that the power correction can also be performed in real time, and the time required for reducing the power measurement period (that is, the sum of the measurement time and the correction time required to obtain the correct optical power value after the power correction) is reduced. 2, the acquisition result of the burst uplink signal is placed in a subsequent burst uplink signal. This method can be used when the real-time requirements of power measurement are not very high. In this method, the acquisition results of the foregoing plurality of burst uplink signals can be concentrated in a certain burst uplink, and the receiving end obtains multiple acquisition results at one time. In this way, the receiving end can receive once every other time without having to receive it every time, which improves the efficiency of the system and reduces the complexity of the system implementation. The getter block in the receiving device receives the pattern information (i.e., the distribution of the duty cycle and/or "0" signal and the "1" signal) from the transmitting device.

In order to ensure the acquisition module of the acquisition module in the transmitting device and the power measurement module in the receiving device For the optical signal in the same period of time, the transmitting end device needs to notify the receiving end device of the time of acquiring the pattern, and the acquiring time of the pattern is the time at which the transmitting end device collects the pattern information.

The receiving end device further includes: a time acquiring module, configured to acquire a pattern acquiring time sent from the sending end device, where the pattern obtaining time is a time at which the transmitting end device collects the pattern information; and a determining module, configured to use the code according to the code The mode acquisition time + signal transmission delay determines the optical signal that the power measurement module needs to measure. The signal transmission delay is a transmission delay of the pattern acquisition time and the time when the transmitting end sends the optical signal, and a delay of the optical signal sent from the transmitting end device to the receiving end device.

If the transmitting device acquires the duty cycle and/or "0" signal and the "signal distribution" in the signal to be transmitted before performing data encoding or agitation on the data, the recovery module or processing module in the receiving device needs to The pattern information obtained by the obtaining module is correspondingly transformed to obtain the transformed pattern information, and the converted optical power value is corrected by using the transformed pattern information.

The specific workflow of each module in Figure 2 is as follows:

The optical signal receiving module receives the optical signal on the P0N network, converts the optical signal into an electrical signal, and outputs the same, and inputs the signal to the recovery module. According to the frame structure of the P0N network, the data in the signal is recovered for normal service; the other input Power measurement to the power measurement module;

The power measurement module performs signal processing including: sampling, amplification, filtering, analog-to-digital conversion, etc. to obtain an average optical power value;

The acquisition module scans the data recovered by the recovery module, and collects the duty ratio of the optical signal to be measured and/or the distribution of the "0" signal and the "1" signal in the optical signal. The collecting module may be implemented by using a hardware circuit or by a software module; the collecting module may be located at a transmitting end, and the transmitting end device collects the pattern information in the optical signal of the communication system; or, at the receiving end, The receiving device collects pattern information in the optical signal of the communication system. The control module performs synchronous control on the acquisition module and the power measurement module to ensure that the data acquisition of the acquisition module and the average optical power measurement of the power measurement module are directed to optical signals in the same period of time.

The processing module uses the pattern information acquired by the acquisition module to correct the optical power value measured by the power measurement module, and obtains the corrected optical power value. If the transmitting device transmits data before performing line coding or agitation processing and then transmitting by electro-optical conversion, the electrical signal obtained by the optical signal receiving module is encoded or agitated, and the recovery module needs to perform the received signal. Decode or go to agitation. The acquisition module can collect the pattern information of the signal that has not been decoded or agitated by the recovery module, and can also collect the pattern information of the signal decoded or unground by the recovery module. In the embodiment of the present invention, the power measurement module measures the optical power value of the signal before decoding or de-agglomeration by the recovery module, so if the acquisition module collects the pattern information of the signal before decoding or de-agglomeration, the processing module The optical power value obtained by the measurement can be directly corrected by using the pattern information; if the acquisition module collects the pattern information of the signal after being decoded or agitated by the recovery module, the acquisition module and/or the processing module need Performing corresponding transformation on the pattern information to obtain transformed pattern information, and the processing module further corrects the measured optical power value by using the transformed pattern information.

An optical power measurement method of the present invention will be described in detail below with reference to FIG.

Referring to FIG. 4, the function of the optical signal receiving module includes the functions of converting an optical signal to an electrical signal, and amplifying the electrical signal. The optical signal to the electrical signal of the optical signal receiving module can be converted by a photodetector (PIN) or an avalanche. The photodiode (APD) is completed, and the electrical signal amplification function can be completed by a transimpedance amplifier (TIA) and/or a limiting amplifier (LA);

The recovery module can be recovered by clock and data recovery (CDR) or burst clock and data

(BCDR), Serial/Serdes and Media Access Control (MAC). The CDR or BCDR performs data and clock recovery on the amplified electrical signal of the optical signal receiving module, and the electrical signal is Serial/serial-serial (Serdes) serial-to-parallel conversion, and then sent to the MAC for P0N physical layer frame protocol processing for normal service;

The power measurement module may be composed of a current sampler (such as a mirror current source), an amplifier and an analog-to-digital AD converter, and a storage area (such as a RAM), and the current sampler performs an electrical signal output by the PIN or APD. Sampling obtains a current signal characterizing the power of the input optical signal to obtain a mirrored electrical signal, which is sent to the amplifier and the analog-to-digital AD converter for amplification, signal conditioning (eg, filtering), and sampling to obtain an image capable of characterizing the input optical signal. The power data is stored in a storage area (such as RAM) under the control of the control module.

The collecting module completes the statistics of the pattern information in the input optical signal, that is, if the receiving device performs statistics on the pattern information, the receiving end performs statistics on the converted electrical signal to obtain an optical signal. If the type information is collected by the transmitting device, it is preferred that the transmitting device completes the statistics of the pattern information before performing the electro-optical conversion, that is, before or after processing the data such as line coding or agitation. The pattern information in the transmitted signal is counted, and the distribution of the duty cycle and/or the "0" signal and the "signal" is statistically obtained. Of course, it is also possible to use an independent module with photoelectric detection and pattern information statistics for processing. The cost and complexity are lower. The above statistics can be implemented by software or by hardware. For example: 1 comparator, 2 counters are used to realize pattern information collection, and a threshold is set in the comparator. Ping, when the electrical signal input from the LA is lower than the threshold level, the trigger counter 1 performs the one clock signal Counting; when the electrical signal input from the LA is higher than the threshold level, the trigger counter 2 counts the one clock signal; the clock signal may be the same as the data rate frequency or higher than the data signal frequency The clock signal can be obtained according to the result of the counter 1 and the counter 2, and the pattern information is stored in a corresponding storage area (such as a RAM) under the control of the control module. The pattern information may be a "0" signal and a "signal ratio or distribution, a duty ratio of the signal, etc." in the optical signal.

The control module may be implemented in a MAC, and the control module performs synchronous control on the power measurement module and the collection module, specifically, the measurement of the power measurement module and the acquisition module. The acquisition is for optical signals in the same time period. For example, after the MAC receives the burst signal, the power measurement module and the acquisition module are simultaneously started at a certain time t1, and the power measurement module and the acquisition module are stopped at another time t2, and the control is performed. The results of the power measurement module and the acquisition module are stored in a corresponding storage area (such as RAM).

The processing module may be composed of a processor (such as a CPU) and a storage area (such as a RAM), and the storage area may be an independent storage area, or may share the same storage area with the power measurement module. The correction obtains an optical power value that is not affected by the pattern information, and completes the measurement of the optical power. If the transmitting device transmits data before performing line coding or agitation processing and then transmitting by electro-optical conversion, the electrical signal obtained by the optical signal receiving module is encoded or agitated, and the recovery module needs to perform the received signal. Decode or go to agitation. The acquisition module can collect the pattern information of the signal that is not decoded or agitated by the recovery module, and can also collect the pattern information of the signal after being decoded or unground by the recovery module. In the embodiment of the present invention, the power measurement module measures the optical power value of the signal before decoding or de-agglomeration by the recovery module, so if the acquisition module collects the pattern information of the signal before decoding or de-agglomeration, the processing module The optical power value obtained by the measurement can be directly corrected by using the pattern information; if the acquisition module collects the pattern information of the signal after being decoded or agitated by the recovery module, the acquisition module and/or the processing module need Performing corresponding transformation on the pattern information to obtain transformed pattern information, and the processing module uses the transformed pattern information to measure the obtained optical power value. Make corrections.

An example of the data processing method in the processing module is as follows:

P ₀ , "0" signal power;

Ρ _λ , the power of the "1"signal;

P _avgJ , the average optical power measured at the i-th time;

N ₀ , the number of "0" signals in the i-th measurement data;

N, _ _t , the number of "1" signals in the i-th measurement data;

The probability of the "0" signal in the i-th measurement data;

The probability of the "1" signal in the i-th measurement data;

Deriving the acquired pattern information and the measured optical power value into the relationship according to the pattern information, the measured optical power value, and the corrected optical power value, to obtain the corrected optical power value, There are various types of relations, one of which is as follows: According to the measured average optical power and the probability of the "0" signal, the "1" signal,

'(P ₀ *N _{0 1} +P ₁ *N ₁ _ ₁ )/(N ₀ _ ₁ +N _{1 1} ) = P _avg _ ₁

< (P ₀ *N _{0 2} +P ₁ *N ₁ _ ₂ )/(N ₀ _ ₂ +N _{1 2} ) = P _avg _ ₂ d +P^N _ln )/(N ₀ _ _n +N _ln ) = P _avg _ _n

Where N _{0 i} , Nu, . _ί is a known amount, . , for unknowns, i=l, 2 n, n is the total number of measurements.

Thus, by extracting two equations arbitrarily, a set of P _Q , can be solved.

In addition, a set of Ρ is solved for each of the two equations. , Ρ, then all the Ρ. , ^ take the average, you can get a more accurate P. , .

It is also possible to solve the above equations by other solutions such as the least squares method to obtain P. , the value of . After processing the average optical power value, the processing module can directly output the power of the "0" signal or the power of the "1" signal. At the same time, considering the user's usage habits, the calculated P _Q can be averaged, that is, P _g = (P ₀ ⁺ P,) /2, and the measured average power is corrected.

In the following, according to the method, a set of data is corrected, and the effects before and after the processing are compared, and the data obtained by the processing module is assumed to be:

By using the above method, the upper table data is substituted into the above equation group to calculate the power of the "0" signal and the "1" signal, and the following results can be obtained: A "0" signal of "1" of the average optical power "0" is measured. Power "1" signal power

Value (mW) number (m ) (mW)

6 4 6

0 10

7 3 7

5 5 5

0 10

7 3 7

2 8 2

0 10

5 5 5 Finally, the corrected optical power value can be obtained as (0+10) /2=5m. Before the method is processed, the average optical power measured is different due to the difference of the distribution of the "0" signal and the "1" signal. A large change, if an abnormal event occurs on the 0DN, the optical power drops. The previous method cannot determine whether the optical power drop is caused by the change of the "0" signal, the "1" signal distribution, or because it occurs on the 0DN. Caused by an abnormal event. After processing, the measured "0" signal power, "1" signal power and average optical power are maintained at a relatively constant value, and the final output power value is not affected by the "0" and "1" signal distribution. If the measured power value changes beyond the predetermined range, it is easier to identify the abnormal event occurring on the 0DN.

When using other hexadecimal optical signals, the number of unknowns is no longer P _Q or two. It is necessary to measure the average optical power value and information symbol distribution multiple times, and obtain multiple equations in the same way to solve the correction. After the light power value. The principle is the same as in binary representation, and is no longer praised.

Another optical power measurement method of the present invention will be described in detail below with reference to FIG.

As shown in FIG. 5, the optical power measuring device has the same structure as that of FIG. 3, and includes: an acquisition module, a power measurement module, and a processing module; wherein, the acquisition module is configured to collect optical signals in the communication system. Pattern information, that is, acquiring pattern information in an electric signal converted by an optical signal; a power measuring module, configured to measure an optical power value of the optical signal corresponding to the communication system, that is, measuring an electrical signal converted by the optical signal, Obtaining an optical power value; and processing a module, configured to correct the optical power value according to the pattern information. The pattern information includes: a duty ratio of the optical signal, and/or a distribution of a "0" signal, a "1" signal in the optical signal, and the acquisition module may be located at a transmitting device, and/or Located at the receiving end device. The optical power measuring device further includes a control module, an optical signal receiving module, and a recovery module, wherein the control module is configured to control the acquiring module and the data measuring module, so that The collection of the acquisition module and the measurement of the power measurement module are for optical signals in the same period of time, that is, for the same optical signal; the optical signal receiving module is configured to receive an optical signal on the P0N network, and The optical signal is converted into an electrical signal and sent to the recovery module and the power measurement module. The recovery module is configured to recover data in the electrical signal for normal service according to an electrical signal output by the optical signal receiving module.

The method for measuring the optical power of each specific functional module in FIG. 5 is the same as that of FIG. 4, and the optical power measurement method thereof will not be repeated here. The difference between the optical power measurement method described in FIG. 4 and the difference between the optical power measurement methods described in FIG. 4 is described. Lie in:

The acquisition module may also be implemented in the MAC, and the recovery module performs a statistics on each data bi t after it recovers, obtains the pattern information, and displays the pattern information under the control of the controller. Stored in the appropriate storage area (such as RAM).

The collecting module may also be implemented in other devices, for example, in a transmitting device, where the transmitting device counts the pattern information of the transmitted data while transmitting data, and sends the pattern information to the receiving. The end device recovers the pattern information through the recovery module and stores it in the corresponding storage area. As another example, the optical power measurement method can also be used to measure the optical power of the optical signal. Similarly, the optical power measuring device can be a transmitting device.

Another optical power measurement method of the present invention is described in detail as follows:

The transmitting device collects the pattern information in the optical signal of the communication system, sends the pattern information and the optical signal to the receiving device, and sends the pattern acquiring time of the optical signal to the receiving device. Wherein, the manner in which the transmitting end device collects the pattern information in the optical signal of the communication system is preferably obtained by the transmitting end device acquiring the pattern information in the signal to be transmitted before or after the line encoding or agitation of the data, that is, Count the distribution of duty cycle and / or "0" signals and "1" signals, of course, It is processed by a separate module with photoelectric detection and pattern information statistics, and the former is lower in cost and complexity than the latter.

A2. The receiving end device receives the pattern acquisition time of the optical signal, the pattern information, and the optical signal, determines the optical signal to be measured according to the pattern acquisition time and the signal transmission delay, and measures the optical signal to An optical power value is obtained, and the optical power value is corrected based on the pattern information.

If the transmitting end device acquires the duty ratio and/or "0" signal and the "signal distribution", ie, the pattern information, in the signal to be transmitted after performing data encoding or agitation on the data, the receiving device needs to be in the receiving device. The received pattern information is transformed correspondingly to obtain the transformed pattern information, and the converted optical power value is corrected by using the transformed pattern information. At this time, the receiving end device performs corresponding transformation on the received pattern information. The transformed pattern information may be performed by a recovery module or a processing module without affecting the implementation of the present invention.

It is understood in the art that the units in the modules in the embodiments may be distributed in the modules of the embodiments according to the embodiments, or may be correspondingly changed in one or more modules different from the embodiment. The units of the above embodiments may be combined into one unit, or may be further split into a plurality of sub-units.

The above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any change or replacement that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be It is intended to be covered by the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request

1. An optical power measurement method, comprising:

Obtaining pattern information in an optical signal of the communication system, where the optical signal comprises: a burst emission optical signal and/or a burst reception optical signal;

Measuring an optical signal of the communication system to obtain an optical power value of the optical signal;

The optical power value is corrected based on the pattern information.

2. The optical power measuring method according to claim 1, wherein the pattern information comprises: a duty ratio and/or a 0 signal and a 1 signal distribution in the optical signal.

The optical power measuring method according to claim 1, wherein the obtaining an optical power value of the optical signal is specifically: obtaining an average optical power value of the optical signal.

4. The optical power measuring method according to claim 1, wherein:

The acquiring the pattern information in the optical signal of the communication system is specifically:

Performing, on the receiving end device, performing statistical calculation on the optical signal of the optical signal of the communication system to obtain pattern information in the optical signal of the communication system;

Alternatively, the receiving end device receives the pattern information in the optical signal of the communication system sent by the transmitting end device, and the pattern information is obtained by the transmitting end device counting the electrical signal before the electro-optical conversion.

The optical power measuring method according to claim 1 or 4, wherein the method further comprises: collecting pattern information of the optical signal and synchronizing the optical power value of the optical signal The optical signal that acquires the pattern information and the optical signal that measures the optical power value are for the optical signal in the same time period.

6. The optical power measuring method according to claim 5, wherein:

Collecting pattern information of the optical signal and measuring an optical power value of the optical signal Synchronization includes:

Obtaining a pattern acquisition time from the sending end device, where the pattern acquiring time is a time at which the sending end device starts collecting the pattern information;

The optical signal to be measured is determined according to the pattern acquisition time and the signal transmission delay.

The optical power measuring method according to claim 1 or 4, wherein the step of correcting the optical power value according to the pattern information comprises:

The acquired pattern information and the obtained optical power value are substituted into the corrected optical power value relationship to obtain a corrected optical power value.

8. An optical power measuring device, comprising:

And an obtaining module, configured to obtain pattern information in an optical signal of the communication system, where the pattern information is obtained by counting the electrical signal converted by the optical signal from the transmitting end device or by reporting by the transmitting device;

a power measurement module, configured to measure the converted electrical signal of the optical signal to obtain an optical power value, and a processing module, configured to correct the optical power value according to the pattern information.

9. The optical power measuring apparatus according to claim 8, wherein the optical power measuring device further comprises if the pattern information is obtained by counting statistics of an electrical signal converted from an optical signal from a transmitting device. Control module

The control module is configured to control the statistics of the pattern obtaining module and the measurement of the power measuring module for optical signals in the same time period.

10. The optical power measuring apparatus according to claim 9, wherein:

The optical power measuring device further includes:

a time acquisition module, configured to acquire a pattern acquisition time from a sender device, where the pattern acquisition time It is the time when the transmitting device starts to collect the pattern information;

And a determining module, configured to determine a time signal and a signal transmission delay according to the pattern, and determine an optical signal that the power measurement module needs to measure.

The optical power measuring device according to claim 8, wherein the optical power measuring device further comprises an optical signal receiving module and a recovery module;

The optical signal receiving module is configured to receive an optical signal on the passive optical network P0N, and convert the optical signal into an electrical signal and send the optical signal to the recovery module and the power measurement module;

The recovery module is configured to recover data in the electrical signal for normal service according to an electrical signal sent by the optical signal receiving module.

The optical power measuring apparatus according to any one of claims 8-11, wherein the pattern information comprises: a duty ratio, and/or a distribution of a 0 signal and a 1 signal.

The optical power measuring device according to any one of claims 8 to 11, wherein the processing module is configured to substitute the pattern information and the obtained optical power value into a modified optical power value relationship. In the middle, the corrected optical power value is obtained.

14. A communication system, comprising:

The transmitting end device for transmitting the burst optical signal is configured to: collect the code type information of the signal during the process of sending the signal to the receiving end device, and send the acquired pattern information to the receiving end device;

a receiving end device for receiving a burst optical signal, configured to measure and receive an optical signal from the transmitting end device, obtain an optical power value of the optical signal, and correct the optical power according to the pattern information sent by the transmitting end device value.

The communication system according to claim 14, comprising:

The sending end device sends the time when the acquiring of the pattern is started to the receiving end device, The receiving end device determines the optical signal to be measured according to the time when the transmitting end device reports the start of acquiring the pattern and the signal transmission delay.