WO2009065364A1 - Procédé, dispositif et système de communication pour mesurer une puissance optique - Google Patents

Procédé, dispositif et système de communication pour mesurer une puissance optique Download PDF

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Publication number
WO2009065364A1
WO2009065364A1 PCT/CN2008/073178 CN2008073178W WO2009065364A1 WO 2009065364 A1 WO2009065364 A1 WO 2009065364A1 CN 2008073178 W CN2008073178 W CN 2008073178W WO 2009065364 A1 WO2009065364 A1 WO 2009065364A1
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WO
WIPO (PCT)
Prior art keywords
signal
optical
optical signal
optical power
pattern information
Prior art date
Application number
PCT/CN2008/073178
Other languages
English (en)
Chinese (zh)
Inventor
Sulin Yang
Jinrong Yin
Zhiguang Xu
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CNA2007100774182A external-priority patent/CN101179332A/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009065364A1 publication Critical patent/WO2009065364A1/fr
Priority to US12/777,082 priority Critical patent/US8369715B2/en

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Classifications

    • 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
    • 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

Definitions

  • 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.
  • 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).
  • ODN Optical Distribute Network
  • TDM Time Division Multiplexing
  • TDMA Time Division Multiple Access
  • 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.
  • 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.
  • events such as bending and aging of the optical fiber at 0DN may also cause measurement results to change.
  • 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.
  • the invention corrects the measured optical power by acquiring the pattern information of the optical signal of the tested communication system.
  • Figure 1 is a schematic structural diagram of a P0N system
  • FIG. 2 is a diagram of an optical power measuring apparatus according to an embodiment of the present invention.
  • FIG. 3 is a structural diagram of a receiving end device according to an embodiment of the present invention.
  • FIG. 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the transmitting end 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.
  • 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 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.
  • 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.
  • 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.
  • PIN photodetector
  • APD photodiode
  • 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
  • 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.
  • 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.
  • 1 comparator 1 comparator, 2 counters are used to realize pattern information collection, and a threshold is set in the comparator.
  • the trigger counter 1 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.
  • 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.
  • 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 processing module can directly output the power of the "0" signal or the power of the "1" signal.
  • 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:
  • 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.
  • 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.
  • 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
  • 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 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.
  • 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.
  • the optical power measurement method can also be used to measure the optical power of the optical signal.
  • the optical power measuring device can be a transmitting device.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

Abstract

Procédé de mesure de puissance optique comprenant : l'acquisition d'information de type code dans un signal optique d'un système de communication, le signal optique étant le signal optique d'une émission de salve et/ou le signal optique d'une réception de salve ; la mesure du signal optique du système de communication, l'acquisition de la valeur de puissance optique du signal optique ; la correction de la valeur de puissance optique en fonction des informations de type code. Un dispositif de mesure de puissance optique comprend : un module d'acquisition pour acquérir des informations de type code dans un signal optique d'un système de communication, les informations de type code étant obtenues par comptage du signal électrique qui est déduit d'une conversion du signal optique émis par le dispositif à une extrémité d'envoi, ou en fonction du rapport émis par le dispositif à une extrémité d'envoi ; un module de mesure de puissance pour mesurer le signal électrique qui est déduit d'une conversion du signal optique, pour obtenir la valeur de puissance optique ; un module de traitement pour corriger la valeur de puissance optique en fonction des informations de type code.
PCT/CN2008/073178 2007-11-24 2008-11-24 Procédé, dispositif et système de communication pour mesurer une puissance optique WO2009065364A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/777,082 US8369715B2 (en) 2007-11-24 2010-05-10 Method and device and communication system for measuring optical power

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CNA2007100774182A CN101179332A (zh) 2007-11-24 2007-11-24 一种测量光功率的方法和装置
CN200710077418.2 2007-11-24
CN200810215052.5 2008-09-04
CN2008102150525A CN101442362B (zh) 2007-11-24 2008-09-04 一种测量光功率的方法和装置

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/777,082 Continuation US8369715B2 (en) 2007-11-24 2010-05-10 Method and device and communication system for measuring optical power

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CN111181635A (zh) * 2020-01-13 2020-05-19 中航海信光电技术有限公司 一种自由空间光通讯测试系统和方法

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WO2007010518A1 (fr) * 2005-07-18 2007-01-25 Passave Ltd. Procede et systeme s'appliquant a des diagnostics de reseau optique passif
CN1905431A (zh) * 2005-07-26 2007-01-31 阿尔卡特公司 用于实现突发模式光功率测量的方法和系统
CN101179332A (zh) * 2007-11-24 2008-05-14 华为技术有限公司 一种测量光功率的方法和装置

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WO2007010518A1 (fr) * 2005-07-18 2007-01-25 Passave Ltd. Procede et systeme s'appliquant a des diagnostics de reseau optique passif
CN1905431A (zh) * 2005-07-26 2007-01-31 阿尔卡特公司 用于实现突发模式光功率测量的方法和系统
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