WO2010111954A1 - 一种光功率测量的方法、光线路终端和光网络单元 - Google Patents

一种光功率测量的方法、光线路终端和光网络单元 Download PDF

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Publication number
WO2010111954A1
WO2010111954A1 PCT/CN2010/071470 CN2010071470W WO2010111954A1 WO 2010111954 A1 WO2010111954 A1 WO 2010111954A1 CN 2010071470 W CN2010071470 W CN 2010071470W WO 2010111954 A1 WO2010111954 A1 WO 2010111954A1
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Prior art keywords
tested
onu
optical signal
time interval
identifier
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PCT/CN2010/071470
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English (en)
French (fr)
Inventor
丁平
董英华
梁选勤
吴广东
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to ES10758056.5T priority Critical patent/ES2564838T3/es
Priority to EP10758056.5A priority patent/EP2413518B1/en
Publication of WO2010111954A1 publication Critical patent/WO2010111954A1/zh
Priority to US13/250,773 priority patent/US8712240B2/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
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0773—Network aspects, e.g. central monitoring of transmission parameters
    • 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
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0775—Performance monitoring and measurement of transmission parameters
    • 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
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0779—Monitoring line transmitter or line receiver equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/072—Monitoring an optical transmission system using a supervisory signal using an overhead signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0083—Testing; Monitoring

Definitions

  • the invention relates to a method for optical power measurement, an optical line terminal and an optical network unit.
  • the application name is 200910106430.
  • the invention is entitled "A method for optical power measurement, an optical line terminal and an optical network unit.
  • the priority of the Chinese Patent Application is incorporated herein by reference.
  • TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a method for optical power measurement, an optical line terminal, and an optical network unit.
  • BACKGROUND OF THE INVENTION As the cost of optical fiber transmission decreases, the optical fiber of the access network is an inevitable development trend. Representing the access network segment of the "last mile” part, with ultra-low cost, simple structure and easy implementation, this brings great challenges to technology implementation.
  • the Passive Optical Network uses passive components and is the most promising technology for implementing broadband optical access networks.
  • the passive optical network usually consists of an Optical Line Terminal (0LT) located at the central office and a series of Optical Network Units (0NUs) located at the customer premises, between the central office and the customer premises.
  • Optical Distribution Network consisting of optical fiber, passive optical splitter or coupler. This approach allows multiple users to share relatively expensive fiber links from the central office to the customer premises, greatly reducing fiber-to-building and fiber-to-the-home implementation costs.
  • the monitoring and maintenance of this fiber link between the 0LT of the central office and the 0NU of the customer premises is particularly important.
  • one way to monitor and maintain this fiber link is: the 0NU of the customer premises sends a burst optical signal to the 0LT of the central office, and the 0LT of the central office receives the burst optical signal and measures the The power of the optical signal is bursted; then, based on the power value of the burst optical signal, the performance of the fiber link between the 0LT and the ONU is analyzed and monitored.
  • the OLT Since the OLT is measuring the power of the burst optical signal sent by the ONU, it is necessary to first perform current mirror sampling on the photocurrent corresponding to the burst optical signal sent by the ONU to obtain a mirror current of the photocurrent, and then convert the mirror current into a voltage, and further The voltage is sampled and held, and then the analog-to-digital converter (Analog-to-Digital Conventer, ADC) is used to perform analog-to-digital conversion on the sampled and held voltage to obtain a digital signal, and then calculate the optical power; under normal circumstances, from the photocurrent It takes about 100us to calculate the optical power value at the end of the sampling.
  • ADC Analog-to-Digital Conventer
  • the 0NU must continuously transmit the optical signal, and finally the high-precision optical power value can be obtained.
  • the OLT needs to allocate a large bandwidth to the ONU to be tested.
  • the large bandwidth is a relatively large bandwidth relative to the time slot in which the 0NU normally transmits data.
  • the DBA Dynamic Bandwidth Assignment
  • the SPDBA module since the DBA module of the 0LT has a certain update period when bandwidth allocation is performed to the ONU, the SPDBA module updates the bandwidth occupied by each ONU in each frame every m frame or Adjustment, where m is an integer greater than 1, usually an integer multiple of two. As shown in Figure 1, the DBA update period is 8 frames.
  • RSSI Received Optical Power
  • a bandwidth longer than the 25us allocated in each frame (125us) such as a bandwidth of at least 100us
  • each frame 0NU1 in a DBA update period is allocated the above-mentioned bandwidth of at least 100us, and other ONU-DBA update periods can only be used.
  • the remaining bandwidth in each frame As shown in Figure 1, during the RSSI measurement, in one update cycle (8 frames) of the DBA, 0NU1 occupies at least 100us per frame; in practice, it takes only 100us to measure the optical power once. That is to say, the bandwidth allocated in the first frame in an update cycle of the DBA can meet the measurement needs, while the other 7 frames do not need to measure the optical power.
  • the quantity is used to transmit data normally, and 0NU1 only needs 25us bandwidth when transmitting data normally.
  • An embodiment of the present invention provides a method for optical power measurement, which is used in a GP0N network including an optical line terminal 0LT and a plurality of optical network units 0NU, including:
  • the PL0AM message is carried in a PL0AM domain of a downlink physical layer operation and maintenance management overhead area in a downlink frame of the GP0N transmission aggregation layer, where the PL0AM message includes the plurality of ONUs.
  • An embodiment of the present invention provides an optical line terminal 0LT, including:
  • a GP0N transmission aggregation layer module configured to generate a physical layer operation and maintenance management PL0AM message, where the PL0AM message is carried in a PL0AM domain of a downlink physical layer operation and maintenance management overhead area in a downlink frame of the GP0N transmission aggregation layer,
  • the PL0AM message includes an identifier of the optical network unit to be tested and a time interval for transmitting the uplink optical signal allocated to the TOU to be tested, so that the TONU to be tested sends an uplink to the 0LT in the time interval.
  • An optical signal where the other ONUs of the plurality of ONUs do not send an uplink optical signal to the OLT in the time interval;
  • the detecting module is configured to receive an uplink optical signal that is sent by the ONU to be tested in the time interval, detect the received uplink optical signal, and determine an optical power of the uplink optical signal.
  • the embodiment of the invention further provides an optical network unit 0NU, comprising: a GP0N transmission convergence layer module (51), a control module (52), and an optical module (53);
  • the GP0N transmission aggregation layer module (51) is configured to receive and parse a physical layer operation and maintenance management message from the optical line terminal OLT, obtain an identifier of the ONU to be tested from the physical layer operation and maintenance management message, and The information about the time interval for transmitting the uplink optical signal allocated by the OLT to the ONU to be tested, the physical layer operation and maintenance management message being carried in the downlink physical layer operation and maintenance management domain of the downlink physical layer control block overhead area in the GP0N downlink frame .
  • the control module (52) is configured to determine whether the identifier of the ONU to be tested matches the identifier of the ONU of the ONU; if the identifier of the ONU to be tested matches the identifier of the ONU of the ONU, the control optical module (53) The uplink optical signal is sent in the time interval. If the identifier of the ONU to be tested does not match the identifier of the ONU, the optical module (53) is controlled not to transmit the uplink optical signal in the time interval.
  • the embodiment of the present invention further provides a passive optical network, including an optical line terminal OLT (61), and a plurality of optical network units ONU, wherein the plurality of ONUs are connected to the OLT through an optical distribution network ODN (62). (61);
  • the 0LT (61) sends a physical layer operation maintenance management PL0AM message to the plurality of ONUs (63) through the 0DN (62), where the physical layer operation maintenance management message is carried in the downlink physical medium in the GP0N downlink frame.
  • the PL0AM message carries the identifier of the ONU to be tested and the information about the time interval for transmitting the uplink optical signal allocated to the TONU to be tested, so that the ONU to be tested is at the time.
  • the interval sends an uplink optical signal to the OLT, and the other ONUs of the plurality of ONUs do not send the uplink optical signal to the OLT in the time interval;
  • the 0LT (61) is further configured to receive the uplink optical signal sent by the to-be-tested ONU according to the time interval information carried in the PL0AM message, detect the received uplink optical signal, and determine the uplink. Optical power of the optical signal;
  • Each of the plurality of ONUs (63) is configured to receive and parse the PL0AM message from the OLT (61), obtain an identifier of the ONU to be tested, and allocate an identifier for the TONU to be tested for sending Time interval information of the uplink optical signal; determining whether the identifier of the ONU to be tested matches its own ONU identifier; if matching, transmitting an uplink optical signal to the 0LT (61) in the time interval, if the to-be-tested If the representation of 0NU does not match the identity of its own ONU, then the upstream optical signal is not sent to the 0LT (61) within the time interval.
  • the transmission layer module of the 0LT allocates a time interval to the ONU to be tested, and sends the information of the time interval to the ONU to be tested through the physical layer operation maintenance management message, and the ONU to be tested After receiving the physical layer operation maintenance management message, the time interval allocated to itself is obtained, and the uplink optical signal is sent in the time interval to perform the measurement of the burst optical power. It can be seen that the technical solution provided by the embodiment of the present invention does not need to allocate bandwidth to the ONU to be tested through the DBA module to measure the uplink burst optical power of the ONU, thereby not updating the bandwidth occupied by each ONU; A time interval is directly allocated to the ONU to be tested.
  • the ONU to be tested occupies a relatively large bandwidth, and in other uplink frames, each ONU still follows the bandwidth allocation scheme of the DBA module.
  • the data is transmitted, so that the waste of the bandwidth can be avoided, and the normal operation of the other ONUs is not affected.
  • the optical power measurement of the optical fiber link is performed by using the technical solution provided by the embodiment of the present invention, without the participation of the DBA module. Simple and flexible, operability is significantly enhanced.
  • FIG. 1 is a schematic diagram showing a bandwidth allocated by a DBA module to a 0NU to be tested in the prior art
  • FIG. 2 is a flow chart showing a method for measuring optical power in an embodiment of the present invention
  • Figure 3 shows the frame structure of the GP0N downlink frame
  • FIG. 4 is a schematic structural diagram of an optical line terminal 0LT according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an optical network unit ONU according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a passive optical network in an embodiment of the present invention.
  • the optical power measurement method provided by the embodiment of the present invention is applied to a Gigabit Passive Optical Network (GPON) including point-to-multipoint communication including 0LT and multiple ONUs, and optical power is applied to the ONU through the OLT.
  • GPON Gigabit Passive Optical Network
  • the measurement provides a basis for analyzing the link performance between the 0LT and the ONU to be tested.
  • Step S1 Generate a physical layer operation and maintenance management PL0AM message.
  • the burst optical power measurement command module 42 in the 0LT When the 0LT initiates the measurement of the received optical power of a certain ONU on the 0NU side (ie, the ONU to be tested), the burst optical power measurement command module 42 in the 0LT generates a burst optical power measurement command, which is included in the command. Detecting the identifier of the ONU; the GP0N transmission convergence layer (GTC) module 43 in the 0LT receives the burst optical power measurement command, and allocates the identifier of the TONU to be tested included in the burst optical power measurement command for the TONU to be tested.
  • GTC transmission convergence layer
  • PLOAM Physical Layer Operation
  • the information of the time interval may include start time information of the time interval, end time information of the time interval, and length information of the time interval, or any two of the information.
  • the length of the time interval is not limited in the present invention. In general, the length of the time interval may be selected to be one frame time, that is, 125 us. If the length of the time interval is less than 125us, it will affect the precision of measuring optical power. Degree, if the length of the time interval is greater than 125us, although the accuracy of measuring optical power can be improved, it will affect the data transmission of other 0NUs in the next frame.
  • the PL0AM message is carried by the downlink physical layer 0AM downstream (PLOAMd) domain in the downlink frame of the GP0N.
  • the structure of the downlink frame of the GPON is as shown in FIG. 3, wherein the GP0N downlink frame includes two parts of a physical control block downstream (PCBd) overhead area and a data payload area, and the PCBd overhead area includes physical layer synchronization ( Physical Synchronization, PSync) field, superframe indicating Ident domain, PLOAMd domain, Bit Interleaved Parity (BIP) domain, Payload Length downstream (PLend) domain, and Upstream Bandwidth Map (US) BW Map) Domain.
  • PCBd physical control block downstream
  • PSync Physical Synchronization
  • BIP Bit Interleaved Parity
  • BIP Payload Length downstream
  • US Upstream Bandwidth Map
  • the PL0AM message carried in the PLOAMd field of the PCBd overhead area in the downlink frame of the GPON carries the identifier of the ONU to be tested and the information of the time interval allocated by the 0LT to the TONU to be transmitted for transmitting the uplink optical signal, so that The ONU to be tested sends an uplink optical signal to the OLT in the time interval, and the other ONUs in the plurality of ONUs do not send an uplink optical signal to the OLT in the time interval, that is, remain silent.
  • the function of the Psync domain, the Ident domain, the BIP domain, the PLent domain, and the US BW map domain in the PCBd overhead area is the prior art.
  • the US BW Map domain carries the bandwidth information allocated by the DBA module according to the DBA update period, and is not described in detail.
  • the data payload area contains a piece of service data fragment based on the GP0N Encapsulation Method (GEM).
  • Step S2 Send the PL0AM message generated in step S1 to multiple 0NUs.
  • the PLOAMd field in the PCBd overhead area of the downlink frame of the GP0N carries the PL0AM message carrying the identifier of the ONU to be tested and the time interval information of the ONU to transmit the uplink optical signal, and then sends the downlink frame to the GP0N network. Multiple 0NUs in .
  • the multiple ONUs After receiving the downlink frame, the multiple ONUs parse the PL0AM message from the downlink frame, and obtain the identifier of the ONU to be tested from the PL0AM message and the time that the OLT allocates the uplink optical signal to the ONU to be tested. Interval information; Then, each ONU compares the identifier of the ONU to be tested with its own ONU identifier.
  • the uplink optical signal is sent in the time interval for transmitting the uplink optical signal, and the uplink optical signal carries the identifier of the ONU, that is, the identifier of the ONU to be tested, so that after receiving the uplink optical signal, the 0LT can determine the receiving interval. Start and detect the power of the upstream optical signal.
  • Step S3 Receive an uplink optical signal sent by the 0NU in the time interval allocated by the 0LT for transmitting the uplink optical signal, and determine the optical power of the uplink optical signal.
  • each of the ONUs After receiving the physical layer operation and maintenance management message, each of the ONUs obtains the information of the identifier of the ONU to be tested and the time interval of the uplink optical signal to be tested by the ONU from the physical layer operation and maintenance management message, and will be tested.
  • the 0NU identifier is compared with its own 0NU identifier.
  • the 0LT is kept silent for the time interval for transmitting the uplink optical signal allocated to the ONU to be tested, that is, the uplink optical signal is not sent to the 0LT;
  • the ONU is the ONU to be tested, and the uplink optical signal is sent in the time interval allocated by the OLT for transmitting the uplink optical signal, and the uplink optical signal carries the identifier of the ONU, that is, the identifier of the ONU to be tested.
  • the 0LT receives the uplink optical signal sent by the ONU to be tested, and detects the identifier of the ONU carried in the uplink optical signal.
  • determining the start of the receiving interval, and according to the 0LT Determining the length of the receiving interval, and determining the length of the receiving interval, and detecting the uplink optical signal sent by the TOU to be tested on the receiving interval; and determining, according to the detected uplink optical signal, the The optical power of the upstream optical signal.
  • the optical signal sent by the ONU to be tested in the above time interval may last for a certain period of time, for example, the duration is lOOus, but the duration may not exceed the allocation allocated by the OLT to the ONU to be tested.
  • the length of the time interval in which the upstream optical signal is transmitted may choose to transmit the optical signal at any time, and the optical signal may not end later than the end time of the above time interval.
  • the link performance between the 0LT and the 0NU to be tested can be analyzed according to the detected optical power value.
  • the GTC module of the 0LT directly allocates a time interval for transmitting the uplink optical signal to the TOU to be tested, and is to be
  • the information about the time interval of the ONU and the time interval during which the ONU sends the uplink optical signal is encapsulated into a PLOAM message carried in the PLOAMd field of the GPON downlink frame, and the PL0AM message is sent to multiple ONUs, and the multiple ONUs are associated with the PL0AM.
  • the ONU of the message whose TOU identifier matches is sent in the above time interval, and the other ONUs remain silent during the time interval, and the 0LT detects the power of the uplink optical signal sent by the ONU to be tested in the above time interval.
  • the present embodiment does not need to allocate a large bandwidth to the ONU to be tested through the DBA module, but directly allocates a time interval for transmitting the uplink burst optical signal to the TOU to be tested through the GTC module of the 0LT, and the ONU to be tested can be One frame occupies a relatively large bandwidth, and in other frames, the data is still transmitted according to the bandwidth originally allocated by the DBA module, so that the waste of bandwidth can be avoided, and the normal operation of other ONUs is not affected; the DBA module is not required for the test process.
  • the participation is simple and flexible, and the operability is significantly enhanced.
  • the embodiment of the invention provides a structure diagram of an optical line terminal 0LT. As shown in FIG. 4, the method includes:
  • the GP0N Transmission Convergence (GTC) module 43 is configured to generate a PLOAM message, where the PL0AM message is carried in the PLOAMd field of the PCBd overhead in the GP0N downlink frame, and the PL0AM message carries the identifier of the ONU to be tested and is The information about the time interval of the uplink optical signal to be transmitted by the ONU to be tested, so that the ONU to be tested sends an uplink optical signal to the OLT in the time interval, and the other ONUs in the multiple ONUs are in the time interval.
  • the upstream optical signal is not sent to the OLT.
  • the GTC module 43 may perform a GP0N transmission aggregation layer encapsulation to generate a GTC frame, and encapsulate the service data fragment carried in the GEM encapsulation mode into a data payload area of the GTC downlink frame, and the identifier carrying the ONU to be tested is The PL0AM message of the information of the time interval for transmitting the uplink optical signal allocated by the ONU to be tested is encapsulated into the PLOAMd field of the PCBd overhead area in the GTC frame.
  • the sending module 44 is configured to send the physical layer operation and maintenance management message to multiple 0NUs;
  • the detecting module 45 is configured to receive and detect an ONU (ie, the ONU to be tested) that matches the identifier of the TON to be tested in the multiple ONUs, after receiving and parsing the physical layer operation and maintenance management message, at the time
  • the uplink optical signal transmitted in the interval determines the optical power of the uplink optical signal based on the detected uplink optical signal.
  • the detecting module 45 detects the optical work of the uplink optical signal sent by the tested ONU in the time interval.
  • the rate can be implemented as follows: First, current mirror sampling is performed on the photocurrent corresponding to the uplink optical signal sent by the tested 0NU, and the mirror current of the photocurrent is obtained, and then the mirror current is converted into a voltage, and then the voltage is sampled and held, and then The analog-to-digital converter ADC is used to perform analog-to-digital conversion on the sample-and-hold voltage to obtain a digital signal, and then calculate the optical power.
  • the above optical line terminal 0LT40 further includes:
  • the CPU 41 is configured to initiate measurement of the burst optical power of the 0NU on the 0NU side, and send the identifier of the 0NU (ie, the 0NU to be tested) to be measured to the burst optical power measurement command module 42.
  • the burst optical power measurement command module 42 is configured to generate a burst optical power measurement command including the to-be-tested ONU identifier according to the identifier of the TOU to be tested, and send the burst optical power measurement command to the GTC module. 43.
  • the GTC module 43 can include a time allocation module 431 and a PL0AM message encapsulation module 432.
  • the time allocation module 431 is configured to allocate a time interval for transmitting the uplink optical signal to the 0NU to be tested according to the burst optical power measurement command sent by the burst optical power measurement command module 42.
  • the PL0AM message encapsulating module 432 is configured to encapsulate the identifier of the TONU to be tested included in the burst optical burst power measurement command and the time interval information allocated by the time allocation module 431 for the ONU to be tested into the PL0AM message, where the PL0AM The message is carried in the PLOAMd field of the PCBd overhead area in the GP0N downstream frame.
  • the transmitting module 44 then transmits the PL0AM message to the plurality of 0NUs through the downstream frame.
  • the sending module 44 can also perform other protocol layer processing after the GTC frame encapsulation, such as the GP0N Physical Media Dependent (GPM) processing.
  • GPS Physical Media Dependent
  • each ONU After the plurality of ONUs receive the PLOAM message, each ONU obtains the identifier of the ONU to be tested from the PL0AM message and the information of the time interval allocated by the ONT for transmitting the uplink optical signal to the TONU to be tested, and the TON to be tested is to be tested.
  • the identifier is compared with its own ONU identifier.
  • the 0LT is silent for the time interval for transmitting the uplink optical signal allocated to the ONU to be tested, that is, Sending an uplink optical signal to the OLT; if the identifier of the ONU to be tested matches the identifier of the ONU of the ONU, indicating that the ONU is the ONU to be tested, sending the uplink optical signal in the allocated time interval. No.
  • the uplink optical signal includes an identifier of the ONU, that is, an identifier of the ONU to be tested.
  • the detecting module 45 receives the uplink optical signal sent by the TOU to be tested, and detects the identifier of the ONU carried in the uplink optical signal, and determines the start of the receiving interval when detecting that the identifier in the uplink optical signal matches the identifier of the ONU to be tested, and Determining the length of the receiving interval according to the information of the time interval for transmitting the uplink optical signal allocated by the OLT to the ONU, and detecting the received uplink optical signal sent by the TONU to determine the uplink optical signal.
  • Optical power is the information of the time interval for transmitting the uplink optical signal allocated by the OLT to the ONU, and detecting the received uplink optical signal sent by the TONU to determine the uplink optical signal.
  • the detection module 45 After detecting the optical power of the obtained uplink optical signal, the detection module 45 reports the detected optical power value to the CPU 41.
  • the CPU 41 analyzes the link performance between the ONU and the 0LT according to the optical power value, for example, analyzing the ONU to be tested.
  • the optical line terminal OLT may also include a DBA module 46.
  • the DBA module may perform dynamic bandwidth allocation and adjustment to the ONU according to the DBA update period.
  • the bandwidth information allocated by the DBA module is carried in the US BW map field of the PCBd overhead area, so as to facilitate the ONU.
  • Each frame of a plurality of frames transmits data according to the allocated bandwidth during the DBA update period.
  • dynamic bandwidth allocation and adjustment are performed through the DBA module to update the bandwidth occupied by each ONU, thereby allocating a relatively large bandwidth to the ONU to be tested, so that the ONU to be tested can transmit one in the large bandwidth.
  • the long-lasting upstream optical signal is used by the 0LT to measure the burst optical power.
  • the transmission aggregation layer module of the OLT directly allocates a time interval for transmitting the uplink optical signal to the ONU to be tested, and does not need to perform dynamic bandwidth adjustment by the DBA module to update the bandwidth occupied by each ONU, thereby giving a test to be tested.
  • 0NU allocates a large bandwidth, so there is no waste of bandwidth.
  • the embodiment of the invention provides a structure diagram of an optical network unit 0NU50, as shown in FIG. 5, including:
  • GTC GP0N transmission convergence layer
  • the GTC module 51 is configured to receive and parse the PL0AM message from the 0LT, obtain the identifier of the 0NU to be tested, and the information that the 0LT allocates to the 0NU to be tested for transmitting the time interval of the uplink optical signal.
  • the PL0AM message is carried in the PLOAMd field of the PCBd overhead area in the GP0N downlink frame.
  • the control module 52 is configured to determine whether the identifier of the ONU to be tested matches its own ONU identifier, if not And the control optical module keeps silent during the time interval that the OLT allocates the uplink optical signal to the ONU to be tested; if it matches, controls the time that the optical module allocates the uplink optical signal to the TON to be tested at the 0LT.
  • the uplink optical signal is transmitted within the interval.
  • the upstream optical signal carries the ONU that transmits the optical signal.
  • the OLT can identify the uplink optical signal by using the identifier in the uplink optical signal, and determine the uplink optical signal to be transmitted by the ONU to determine the receiving interval. Initially, the power of the upstream optical signal is received and detected.
  • An embodiment of the present invention provides a structure diagram of a passive optical network. As shown in FIG. 6, the method includes: a ray path terminal (0LT) 61, and a plurality of optical network units connected to the 0LT61 through the optical distribution network (0DN) 62.
  • (0NU) 63 as in Fig. 6, 0NU-1, 0NU-2, ..., 0NU-N, in one embodiment of the invention, N is an integer greater than two.
  • the structure of the 0LT61 is shown in Figure 4, and the structure of the 0NU63 is shown in Figure 5.
  • the 0LT61 is connected to one end of the optical distribution network 0DN62, and the other end of the 0DN62 is connected to a plurality of optical network units.
  • the following takes 0NU-1 as an example to explain how to implement the burst optical power of 0NU in the network.
  • the 0LT61 initiates the measurement of the burst optical power of 0NU-1 to analyze the optical line terminals 0LT61 and 0NU-1. Inter-fiber link performance.
  • the OLT 61 first allocates a time interval for transmitting the uplink optical signal to the ONU-1, and encapsulates the identifier of the ONU-1 and the information about the time interval for transmitting the uplink optical signal into the PL0AM message to generate a PL0AM message. Then, the PL0AM message is sent to the N ONUs in FIG. 6; wherein the specific process of sending the PL0AM message to the N ONUs in FIG. 6 is: 0LT61 first sends the PL0AM message to the optical distribution network 62, and then passes The optical distribution network 62 distributes the PL0AM message to the N ONUs in FIG.
  • the N ONUs in FIG. 6 receive and parse the above-mentioned PL0AM message including the identifier of the ONU to be tested (0NU-1) and the information of the time interval allocated by the OLT to the ONU-1 for transmitting the uplink optical signal, to obtain the ONU-
  • the identifier of 1 and the time interval allocated by the 0LT61 to the ONU-1 for transmitting the uplink optical signal, and the N 0NUs respectively compare the identifier of the ONU-1 with its own identifier; if not, for example, except for the 0NU-1 If the other 0NUs do not match, then these ONUs remain silent in the time interval allocated by 0LT61 to 0NU-1, that is, no uplink optical signal is sent to 0LT61; if it matches, 0NU-1 finds that the PL0AM message contains The ID of the ONU is measured as its own identifier, and 0NU-1 transmits the upstream optical signal in the time interval allocated by the 0LT to the
  • the upstream optical signal transmitted by 0NU-1 first reaches the optical distribution network 62, and then the optical distribution network 62 transmits the upstream optical signal to the 0LT61.
  • the 0LT61 receives the upstream optical signal transmitted by the 0NU-1 and detects the power of the upstream optical signal. Then, the 0LT61 analyzes the performance of the optical link between the 0NU-1 and the 0LT62 according to the detected power of the upstream optical signal.
  • the testing process of the embodiment of the present invention does not require the participation of the DBA module, can avoid the waste of bandwidth, and does not affect the normal operation of each ONU, and is simple and flexible to implement. Very operative.
  • the above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

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Abstract

本发明实施例涉及通信领域，特别公开了一种光功率测量的方法、光线路终端和光网络单元。所述方法包括：生成物理层操作维护管理PLOAM消息，所述PLOAM消息中包括待测ONU的标识和为所述待测ONU分配的用于发送上行光信号的时间区间的信息；将所述 PLOAM消息发送给所述多个ONU；接收所述待测ONU在所述被分配的时间区间内发送的上行光信号；检测接收到的所述上行光信号，确定所述上行光信号的光功率。本发明避免了现有技术中光功率检测过程中，通过DBA模块给待测ONU分配带宽以进行光功率的检测而造成的带宽浪费。

Description

一种光功率测量的方法、 光线路终端和光网络单元 本申请要求 2009年 3月 31日递交的申请号为 200910106430. 0、 发明名称为 "一种光功率测量的方法、光线路终端和光网络单元"的中国专利申请的优先 权， 其全部内容通过引用结合在本申请中。 技术领域 本发明涉及通信领域， 尤其涉及一种光功率测量的方法、光线路终端和光 网络单元。 背景技术 随着光纤传输的成本逐步下降， 接入网的光纤化是必然的发展趋势。代表 着 "最后一公里"部分的接入网段， 有超低成本、简单结构以及便于实现等要 求， 这给技术实现带来了很大的挑战。 而无源光网络 （Passive Optical Network, PON)采用了无源器件， 是实现宽带光接入网最有潜力的技术。
无源光网络通常是由位于中心局的光线路终端（Optical Line Terminal , 0LT)和一系列位于用户驻地的光网络单元（Optical Network Unit, 0NU)构 成， 在中心局和用户驻地之间是由光纤、无源分光器或耦合器构成的光分配网 (Optical Distribution Network, 0DN) 。 该方式可使多个用户共享从中心 局到用户驻地之间相对昂贵的光纤链路，从而极大地降低了光纤到楼和光纤到 户的实现成本。
这样， 中心局的 0LT与用户驻地的 0NU之间的这段光纤链路的监控和维护就 显得尤其重要了。 在实践中， 对这段光纤链路进行监控和维护的一种方式是： 用户驻地的 0NU发送一个突发光信号给中心局的 0LT， 中心局的 0LT接收该突发 光信号， 并测量该突发光信号的功率； 然后， 根据该突发光信号的功率值， 分 析和监控 0LT与 0NU之间的光纤链路的性能状况。 由于 OLT在测量 ONU发送的突发光信号的功率时， 需要首先对 0NU发送的突 发光信号对应的光电流进行电流镜采样， 得到光电流的镜像电流， 再将镜像电 流转换成电压， 进而对电压进行采样保持， 然后采用模数转换器 (Analog-to-Digital Conventer, ADC) 对采样保持的电压进行模数转换， 得 到数字信号， 然后进行计算光功率； 正常情况下， 从对光电流进行采样到最后 计算出光功率值大约需要 lOOus, 在这 lOOus的时间里， 0NU必须持续发送光信 号， 最后才能得到高精度的光功率值。 为了保证 0NU发出的突发光信号达到一 定的持续时间， 比如 lOOus, OLT需要给待测 ONU分配一个大带宽， 该大带宽是 相对于 0NU正常发送数据的时隙而言的一个比较大的带宽， 如至少 lOOus的带 宽，而在给待测 0NU分配大带宽的过程中，需要 0LT中的 DBA (Dynamic Bandwidth Assignment, 动态带宽分配）模块对所有的 ONU进行带宽调整， 以便给待测 0NU 分配大带宽。
发明人在研究过程中发现， 由于 0LT的 DBA模块在对 0NU进行带宽分配时， 有一定的更新周期， SPDBA模块每经过 m帧， 才会对各 0NU在每帧中占用的带宽 进行一次更新或调整，其中， m为大于 1的整数， 通常为 2的整数倍。如图 1所示， DBA更新的周期为 8帧， 在非测量期间， 0NU1在一帧 （125us ) 内占用的带宽只 有 M us， 比如 M=25， 0NU1在这 25us的时间内传输数据； 现在需要对 0NU1发起接 收光功率 （RSSI ) 测量， 就需要给 0NU1分配一个比上述每一帧 （125us ) 中分 配到的 25us大的连续时间区间的带宽， 比如至少 lOOus的带宽， DBA模块为了给 0NU1分配至少 lOOus的带宽， 连接到同一 0LT中的其它 0NU占用的带宽就会相应 减少。 由于各 0NU占用的带宽在一个 DBA更新周期内保持不变， 即在一个 DBA更 新周期内的每一帧 0NU1都分配了上述至少 lOOus的带宽， 而其它 0NU—个 DBA更 新周期内的只能使用每一帧中剩下的带宽。 如图 1中所示， 在 RSSI测量期间， 在 DBA的一个更新周期 （8帧） 内， 0NU1在每帧都占用了至少 lOOus; 而在实践 中， 测量一次光功率只需要 lOOus的时间， 也就是说在 DBA的一个更新周期内第 一帧内分配的带宽就能够满足测量的需要， 而其它 7帧是不用进行光功率的测 量， 是用来正常传输数据的， 而 0NU1在正常传输数据时只需要 25us的带宽， 那 么在 DBA的一个更新周期内， 0NU1至少要浪费 75us X 7=525us的带宽，在一个 DBA 的更新周期内， 浪费的带宽所占的比例为 525us/ ( 125us X 8 ) =52. 5%， 对于其 它 0NU来说本来需要的带宽又得不到保证。 因此， 现有技术中， 利用 DBA模块给 待测 0NU分配大带宽以进行突发光功率测量的方法，将会造成极大的带宽浪费， 同时会给其他 0NU的正常工作造成影响。 发明内容
本发明实施例提供了一种光功率测量的方法，所述方法用于包括光线路终 端 0LT和多个光网络单元 0NU的 GP0N网络， 包括：
生成物理层操作维护管理 PL0AM消息， 其中， 所述 PL0AM消息承载于 GP0N传 输汇聚层下行帧中下行物理层操作维护管理开销区的 PL0AM域中，所述 PL0AM消 息中包括所述多个 0NU中的待测 0NU的标识和为所述待测 0NU分配的用于发送上 行光信号的时间区间的信息， 以便所述待测 0NU在所述时间区间向所述 0LT发送 上行光信号， 所述多个 0NU中其它 0NU在所述时间区间不向所述 0LT发送上行光 信号；
将所述 PL0AM消息从 0LT发送给所述多个 0NU;
接收所述待测 0NU在所述被分配的时间区间内发送的上行光信号； 检测接 收到的所述上行光信号， 确定所述上行光信号的光功率。
本发明实施例提供了一种光线路终端 0LT， 包括：
GP0N传输汇聚层模块 （43 ) ， 用于生成物理层操作维护管理 PL0AM消息， 其中， 所述 PL0AM消息承载于 GP0N传输汇聚层下行帧中下行物理层操作维护管 理开销区的 PL0AM域中， 所述 PL0AM消息中包括待测光网络单元 0NU的标识和为 所述待测 0NU分配的用于发送上行光信号的时间区间的信息， 以便所述待测 0NU 在所述时间区间向所述 0LT发送上行光信号， 所述多个 0NU中其它 0NU在所述时 间区间不向所述 0LT发送上行光信号；
发送模块， 用于将所述物理层操作维护管理消息发送给所述多个 0NU; 检测模块， 用于接收所述待测 ONU在所述时间区间内发送的上行光信号， 检测接收得到的所述上行光信号， 确定所述上行光信号的光功率。
本发明实施例还提供了一种光网络单元 0NU， 包括： GP0N传输汇聚层模块 (51 ) 、 控制模块 （52) 、 光模块 （53) ；
所述 GP0N传输汇聚层模块 （51 ) ， 用于接收并解析来自于光线路终端 0LT 的物理层操作维护管理消息， 从所述物理层操作维护管理消息中得到待测 0NU 的标识，和所述 0LT给所述待测 0NU分配的用于发送上行光信号的时间区间的信 息，所述物理层操作维护管理消息承载于 GP0N下行帧中下行物理层控制块开销 区的下行物理层操作维护管理域。
所述控制模块（52) ， 用于判断所述待测 0NU的标识与自身的 0NU的标识是 否匹配； 若所述待测 0NU的标识与自身的 0NU的标识匹配， 则控制光模块 （53) 在所述时间区间内发送上行光信号，若所述待测 0NU的标识与自身的 0NU的标识 不匹配， 则控制所述光模块 （53) 在所述时间区间内不发送上行光信号。
本发明实施例还提供了一种无源光网络， 包括一个光线路终端 0LT (61 ) 、 和多个光网络单元 0NU， 所述多个 ONU通过光分配网 ODN ( 62 ) 连接到所述 OLT (61 ) ；
所述 0LT ( 61 ) 通过所述 0DN ( 62 ) 向所述多个 0NU ( 63 ) 发送物理层操作 维护管理 PL0AM消息， 其中， 所述物理层操作维护管理消息承载于 GP0N下行帧 中的下行物理层操作维护管理域中，所述 PL0AM消息中携带有待测 0NU的标识和 为所述待测 0NU分配的用于发送上行光信号的时间区间的信息， 以便所述待测 0NU在所述时间区间向所述 0LT发送上行光信号，所述多个 0NU中其它 0NU在所述 时间区间不向所述 0LT发送上行光信号；
所述 0LT (61 ) ， 还用于接收所述待测 0NU根据所述 PL0AM消息中携带的所 述时间区间的信息发送的上行光信号， 检测所述接收到的上行光信号， 确定所 述上行光信号的光功率； 所述多个 ONU中每一个 ONU ( 63 ) ， 用于接收并解析来自于所述 OLT ( 61 ) 的所述 PL0AM消息， 获得待测 0NU的标识和为所述待测 0NU分配的用于发送上行 光信号的时间区间信息； 确定所述待测 0NU的标识是否与自己的 0NU标识匹配； 若匹配， 则在所述时间区间内向所述 0LT ( 61 ) 发送上行光信号， 若所述待测 0NU的表示和自身的 0NU的标识不匹配， 则在所述时间区间内不向所述 0LT (61 ) 发送上行光信号。
由此可见， 在本发明实施例中， 通过 0LT的传输汇聚层模块给待测 0NU分配 一个时间区间， 并通过物理层操作维护管理消息将该时间区间的信息发送给待 测 0NU， 待测 ONU接收到物理层操作维护管理消息后获知给自己分配的时间区 间， 在该时间区间内发送上行光信号以便 0LT进行突发光功率的测量。 由此可 以看出， 本发明实施例所提供的技术方案， 无需通过 DBA模块给待测 0NU分配带 宽来测量 0NU的上行突发光功率， 从而也就不要更新各 0NU占用的带宽； 而是通 过直接给待测 0NU分配一个时间区间， 在该时间区间所在的上行帧中， 待测 0NU 占用一个相对的大带宽， 而在其他的上行帧中， 各 0NU依然按照 DBA模块已有的 带宽分配方案传输数据， 这样就可以避免带宽的浪费， 也不会影响其他 0NU的 正常工作； 另外， 使用本发明实施例所提供的技术方案对光纤链路进行光功率 测量， 无需 DBA模块的参与， 实现起来简单灵活， 可操作性显著增强。
附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 并不构成对本发明的限定。
图 1示出了现有技术中 DBA模块给待测 0NU分配带宽的示意图；
图 2示出了本发明实施例中一种光功率的测量方法流程图；
图 3示出了 GP0N下行帧的帧结构；
图 4示出了本发明实施例中一种光线路终端 0LT的结构示意图；
图 5示出了本发明实施例中一种光网络单元 0NU的结构示意图； 图 6示出了本发明实施例中一种无源光网络的结构示意图。
具体实施方式 为了便于本领域一般技术人员理解和实现本发明，现结合附图描绘本发明 的实施例。 在此， 本发明的示意性实施例及其说明用于解释本发明， 但并不作 为对本发明的限定。
本发明实施例提供的光功率测量方法，应用于包含 0LT和多个 0NU的点到多 点通信的千兆比特无源光网络 (Gigabit passive Optical Network, GPON) 中， 通过 OLT对 ONU进行光功率测量， 为分析 0LT与待测 ONU之间的链路性能状况 提供依据。
本发明实施例中一种光功率测量的方法流程图如图 2所示， 该方法包括： 步骤 S1: 生成物理层操作维护管理 PL0AM消息。
在 0LT发起对 0NU侧的某一个 0NU (即为待测 0NU)进行接收光功率测量时， 0LT中的突发光功率测量命令模块 42会产生一个突发光功率测量命令， 该命令 中包含待测 0NU的标识； 0LT中的 GP0N传输汇聚层 （GTC) 模块 43收到该突发光 功率测量命令后， 根据该突发光功率测量命令包含的待测 0NU的标识， 为待测 0NU分配用于发送上行光信号的时间区间， 并将待测 0NU的标识和为待测 0NU分 配的所述时间区间的信息封装到物理层操作维护管理 （Physical Layer Operation, Administration and Maintenance, PLOAM)消息中，从而生成 PLOAM 消息。
上述时间区间的信息可以包括时间区间的起始时间信息、时间区间的终止 时间信息和时间区间的长度信息， 或者其中的任意两种信息。 对时间区间的长 度在本发明中不做限制， 一般情况下， 可以选择将时间区间的长度设定为一帧 的时间， 即 125us。 如果时间区间的长度小于 125us， 就会影响测量光功率的精 度， 如果时间区间的长度大于 125us， 虽然能够提高测量光功率的精度， 但是 会影响到下一帧其它 0NU的数据传输。
需要说明的是， PL0AM消息是由 GP0N的下行帧中的下行物理层操作维护管 理 （Physical Layer 0AM downstream, PLOAMd) 域所承载。 GPON的下行帧的 结构如图 3所示， 其中 GP0N下行帧包括下行物理层控制块 （Physical Control Block downstream, PCBd) 开销区和数据净荷区两个部分， PCBd开销区中包括 物理层同步（Physical Synchronization, PSync)域、超帧指示 Ident域、 PLOAMd 域、 误码测量 (Bit Interleaved Parity, BIP) 域、 下行净荷长度 （Payload Length downstream, PLend) 域和上行带宽地图 (Upstream Bandwidth Map, US BW Map) 域。 在本实施例中， GPON的下行帧中 PCBd开销区的 PLOAMd域承载 的 PL0AM消息中携带有待测 0NU的标识和 0LT给待测 0NU分配的用于发送上行光 信号的时间区间的信息， 以便所述待测 0NU在所述时间区间向所述 0LT发送上行 光信号，所述多个 0NU中其它 0NU在所述时间区间不向所述 0LT发送上行光信号， 即保持静默。 PCBd开销区中的 Psync域、 Ident域、 BIP域、 PLent域、 US BW Map 域的功能是现有技术， 例如 US BW Map域承载 DBA模块按 DBA更新周期分配的带 宽信息， 不做详细介绍。 数据净荷区中包含基于 GP0N封装模式 （GP0N Encapsulation Method, GEM) 承载业务数据片段。
步骤 S2： 将步骤 S 1中生成的 PL0AM消息发送给多个 0NU。
如上所述， GP0N的下行帧中 PCBd开销区的 PLOAMd域中，承载携带有待测 0NU 的标识和待测 0NU发送上行光信号的时间区间信息的 PL0AM消息，然后将该下行 帧发送给 GP0N网络中的多个 0NU。
上述的多个 0NU接收到上述下行帧后， 从下行帧中解析得到所述 PL0AM消 息， 从该 PL0AM消息中获取待测 0NU的标识和 0LT为待测 0NU分配的用于发送上行 光信号的时间区间信息； 然后， 每个 0NU将待测 0NU的标识与自己的 0NU标识进 行比较， 如果不匹配， 则在 0LT为待测 0NU分配的用于发送上行光信号的时间区 间内保持静默， 即不向 0LT发送上行光信号； 如果匹配， 则在 0LT为该待测 0NU 分配的用于发送上行光信号的时间区间内发送上行光信号， 该上行光信号携带 有 0NU的标识， 即待测 0NU的标识， 以便 0LT在接收到该上行光信号后， 可以确 定接收区间的开始并检测该上行光信号的功率。
步骤 S3: 接收待测 0NU在 0LT为其分配的用于发送上行光信号的时间区间 内发送的上行光信号， 确定所述上行光信号的光功率。
上述多个 0NU接收到物理层操作维护管理消息后，每个 0NU从物理层操作维 护管理消息中获取到待测 0NU的标识和待测 0NU发送上行光信号的时间区间的 信息， 并将待测 0NU的标识与自己的 0NU标识进行比较， 如果不匹配， 则在 0LT 为待测 0NU分配的用于发送上行光信号的时间区间内保持静默， 即不向 0LT发送 上行光信号； 如果匹配， 说明该 0NU为待测 0NU， 则在 OLT为该待测 ONU分配的用 于发送上行光信号的时间区间内发送上行光信号， 该上行光信号携带有 0NU的 标识， 即待测 0NU的标识。
0LT接收待测 0NU发送的上行光信号， 并检测上行光信号中携带的 0NU的标 识， 当检测到上行光信号中的标识与待测 0NU的标识匹配时， 确定接收区间的 开始， 并且根据 0LT给待测 0NU分配的发送上行光信号的时间区间的信息， 确定 接收区间的长度， 在该接收区间上检测待测 0NU发送的上行光信号； 然后， 根 据检测得到的上行光信号， 确定所述上行光信号的光功率。
在上述过程中， 待测 0NU在上述时间区间内 （比如 125us )发送的光信号可 以持续一定的时间， 比如持续时间为 lOOus, 但是该持续时间不能超过所述 OLT 给待测 ONU分配的用于发送上行光信号的时间区间的长度。在所述 0LT分配的时 间区间内， 待测 0NU可以选择在任何时间发送光信号， 光信号结束的时间不能 迟于上述时间区间的终止时间。
在检测完待测 0NU发送的上行光信号的光功率后， 可以根据检测得到的光 功率值， 分析 0LT和待测 0NU之间的链路性能情况。
本实施例中， 如果 0LT对连接到其上的多个 0NU中的待测 0NU进行光功率测 量， 0LT的 GTC模块直接给待测 0NU分配一个发送上行光信号的时间区间， 将待 测 ONU的标识和待测 ONU发送上行光信号的时间区间的信息封装到承载于 GPON 下行帧的 PLOAMd域的 PLOAM消息中， 并将该 PL0AM消息发送给多个 0NU， 这多个 0NU中与 PL0AM消息中的待测 0NU标识匹配的 0NU，在上述时间区间内发送上行光 信号， 而其它 0NU在该时间区间内保持静默， 0LT检测待测 0NU在上述时间区间 内发送的上行光信号的功率。 由此可以发现， 本实施例不需要通过 DBA模块给 待测 0NU分配大带宽，而是通过 0LT的 GTC模块直接给待测 0NU分配一个发送上行 突发光信号的时间区间， 待测 0NU可以在一帧内占用一个相对的大带宽， 而在 其它帧内依然按照 DBA模块原先分配的带宽传输数据， 因此可以避免带宽的浪 费， 也不会对其他 0NU的正常工作造成影响； 测试过程无需 DBA模块的参与， 实 现起来简单灵活， 可操作性显著增强。
本发明实施例提供了一种光线路终端 0LT的结构图， 如图 4所示， 包括：
GP0N传输汇聚层 （GPON Transmission Convergence, GTC) 模块 43， 用于 生成 PLOAM消息，所述 PL0AM消息承载于 GP0N下行帧中 PCBd开销的 PLOAMd域中所 述 PL0AM消息中携带有待测 0NU的标识和为所述待测 0NU分配的发送上行光信号 的时间区间的信息， 以便所述待测 0NU在所述时间区间向所述 0LT发送上行光信 号， 所述多个 0NU中其它 0NU在所述时间区间不向所述 0LT发送上行光信号。 其 中， GTC模块 43可以进行 GP0N传输汇聚层封装生成 GTC帧， 将基于 GEM封装模式 承载的业务数据片段封装到 GTC下行帧的数据净荷区，将上述携带有待测 0NU的 标识和为所述待测 0NU分配的发送上行光信号的时间区间的信息的 PL0AM消息 封装到 GTC帧中 PCBd开销区的 PLOAMd域。
发送模块 44， 用于将所述物理层操作维护管理消息发送给多个 0NU;
检测模块 45，用于接收并检测所述多个 0NU中与所述待测 0NU的标识匹配的 0NU (即待测 0NU)在接收并解析所述物理层操作维护管理消息后， 在所述时间 区间内发送的上行光信号， 根据检测接收到的上述上行光信号， 确定上述上行 光信号的光功率。
检测模块 45检测被测 0NU在所述时间区间内发送的所述上行光信号的光功 率， 可以采用如下方式实现： 先对被测 0NU发送的上行光信号对应的光电流进 行电流镜采样， 得到光电流的镜像电流， 再将镜像电流转换成电压， 进而对电 压进行采样保持， 然后采用模数转换器 ADC对采样保持的电压进行模数转换， 得到数字信号， 然后进行计算光功率。
上述的光线路终端 0LT40还进一步包括：
CPU41和突发光功率测量命令模块 42;
所述 CPU41 , 用于发起对 0NU侧的哪个 0NU进行突发光功率的测量， 并将需 要测量的 0NU (即待测 0NU) 的标识， 发送给突发光功率测量命令模块 42。
突发光功率测量命令模块 42， 用于根据所述待测 0NU的标识， 产生包含有 所述待测 0NU标识的突发光功率测量命令， 并将该突发光功率测量命令发送给 GTC模块 43。
其中， GTC模块 43可以包括时间分配模块 431和 PL0AM消息封装模块 432。 时间分配模块 431， 用于根据突发光功率测量命令模块 42发送的突发光功 率测量命令， 给待测 0NU分配一个用于发送上行光信号的时间区间。
PL0AM消息封装模块 432，用于将突发光突发光功率测量命令中包含的待测 0NU的标识，和时间分配模块 431为待测 0NU分配的时间区间信息封装到 PL0AM消 息中， 所述 PL0AM消息承载于 GP0N下行帧中 PCBd开销区的 PLOAMd域中。
发送模块 44然后通过下行帧将 PL0AM消息发送给多个 0NU。发送模块 44还可 以进行 GTC帧封装之后的其它协议层处理， 如 GP0N物理媒质相关子层 （GP0N Physical Media Dependent, GPM) 处理。
上述多个 ONU接收到 PLOAM消息后， 每个 0NU从 PL0AM消息中获取到待测 0NU 的标识和 0LT为待测 0NU分配的用于发送上行光信号的时间区间的信息， 并将待 测 0NU的标识与自己的 0NU标识进行比较，如果所述待测 0NU的标识与自身的 0NU 的标识不匹配，则在 0LT为待测 0NU分配的用于发送上行光信号的时间区间内保 持静默， 即不向 0LT发送上行光信号； 如果所述待测 0NU的标识与自身的 0NU的 标识匹配， 说明该 0NU为待测 0NU， 则在所述被分配的时间区间内发送上行光信 号， 该上行光信号包含 ONU的标识， 即待测 0NU的标识。
检测模块 45接收待测 0NU发送的上行光信号， 并检测上行光信号中携带的 0NU的标识， 当检测到上行光信号中的标识与待测 0NU的标识匹配时， 确定接收 区间的开始， 并且根据 0LT给待测 0NU分配的用于发送上行光信号的时间区间的 信息， 确定接收区间的长度， 在该接收区间上检测接收到的待测 0NU发送的上 行光信号， 确定上述上行光信号的光功率。
检测模块 45检测得到的上行光信号的光功率后，将检测得到的光功率值上 报给 CPU41 , CPU41根据此光功率值分析待测 0NU与 0LT之间的链路性能， 比如分 析待测 0NU与 0LT之间的光纤链路损耗、待测 0NU与 0LT之间的光纤链路损耗随时 间的变化关系等。
光线路终端 0LT还可以包含有 DBA模块 46， DBA模块可以根据 DBA更新周期给 0NU进行动态带宽分配和调整， 其中， DBA模块分配的带宽信息承载在 PCBd开销 区的 US BW map域， 以便于 ONU在 DBA更新周期内多个帧的每一帧都按根据分配 的带宽发送数据。 在现有技术中， 是通过 DBA模块进行动态带宽分配和调整， 以更新各 0NU占用的带宽， 从而来给待测 0NU分配一个相对的大带宽， 以便待测 0NU在该大带宽内能够发送一个持续时间较长的上行光信号，供 0LT进行突发光 功率的测量。 而在本实施例中， 通过 0LT的传输汇聚层模块直接给待测 0NU分配 一个发送上行光信号的时间区间， 不需要通过 DBA模块进行动态带宽调整来更 新各 0NU占用的带宽， 从而给待测 0NU分配一个大带宽， 因此也就不会造成带宽 的浪费。
本发明实施例提供了一种光网络单元 0NU50的结构图， 如图 5所示， 包括：
GP0N传输汇聚层 （GTC) 模块 51、 控制模块 52和光模块 53;
GTC模块 51，用于接收并解析来自于 0LT的 PL0AM消息，得到待测 0NU的标识， 和 0LT给待测 0NU分配的用于发送上行光信号的时间区间的信息。 该 PL0AM消息 承载于 GP0N下行帧中 PCBd开销区的 PLOAMd域。
控制模块 52， 用于判断待测 0NU的标识与自身的 0NU标识是否匹配， 若不匹 配， 则控制光模块在 OLT给待测 ONU分配的用于发送上行光信号的时间区间内保 持静默； 若匹配， 则控制光模块在 0LT给待测 0NU分配的用于发送上行光信号的 时间区间内发送上行光信号。 其中， 该上行光信号中携带有发送光信号的 0NU
(即待测 0NU) 的标识， 以便 0LT接收到该上行光信号后， 可以通过识别该上行 光信号中的标识， 确定该上行光信号是待测 0NU发送的上行光信号， 进而确定 接收区间的开始， 接收并检测该上行光信号的功率。
本发明实施例提供了一种无源光网络的结构图， 如图 6所示， 包括： 光线 路终端 （0LT) 61、 和通过光分配网 （0DN) 62连接到 0LT61的多个光网络单元
(0NU) 63， 如图 6中 0NU-1、 0NU-2, …， 0NU-N，在本发明的一个实施例中 N为大 于 2的整数。 该 0LT61的结构如图 4所示、 0NU63的结构如图 5所示。
所述 0LT61连接光分配网 0DN62的一端， 0DN62的另一端连接多个光网络单 元。 下面以 0NU-1为例， 具体阐述如何在该网络中 0LT实现对 0NU的突发光功率 假定 0LT61发起对 0NU-1的突发光功率的测量， 以分析光线路终端 0LT61与 0NU-1之间的光纤链路性能。
所述 0LT61首先给 0NU-1分配一个用于发送上行光信号的时间区间， 并将 0NU-1的标识和上述用于发送上行光信号的时间区间的信息封装到 PL0AM消息 中， 生成 PL0AM消息， 然后将该 PL0AM消息向图 6中的 N个 0NU发送； 其中， 将该 PL0AM消息向图 6中的 N个 0NU发送的具体过程为： 0LT61首先将该 PL0AM消息发送 给光分配网 62， 然后通过该光分配网 62将该 PL0AM消息向图 6中的 N个 0NU分发。
图 6中的 N个 0NU都接收并解析上述包含有待测 ONU (0NU-1 )的标识和 0LT给 ONU- 1分配的用于发送上行光信号的时间区间的信息的 PL0AM消息， 得到 ONU- 1 的标识和 0LT61给 ONU- 1分配的用于发送上行光信号的时间区间的信息， N个 0NU 分别将 0NU-1的标识与自身的标识进行比较； 如果不匹配， 例如除了 0NU-1外的 其它 0NU都不匹配， 则这些 0NU在 0LT61给 0NU-1分配的时间区间内保持静默， 即 不向 0LT61发送上行光信号； 如果匹配， 即 0NU-1发现该 PL0AM消息中包含的待 测 ONU的标识就是自己的标识， 0NU-1则在 0LT给 0NU-1分配的所述时间区间内发 送上行光信号。
0NU-1发送的上行光信号先达到光分配网 62， 然后光分配网 62再将该上行 光信号发送给 0LT61。
0LT61接收 0NU-1发送的上行光信号， 并检测该上行光信号的功率， 然后， 0LT61会根据检测得到的上行光信号的功率分析 0NU-1与 0LT62之间的光纤链路 的性能。
通过上述对本发明实施例的阐述， 可以看出本发明实施例的测试过程无需 DBA模块的参与， 可以避免带宽的浪费， 也不会对各 0NU的正常工作带来影响， 实现起来简单灵活， 可操作性很强。 以上所述， 仅为本发明较佳的具体实施方 式， 但本发明的保护范围并不局限于此， 任何熟悉本技术领域的技术人员在本 发明揭露的技术范围内， 可轻易想到的变化或替换， 都应涵盖在本发明的保护 范围之内。 因此， 本发明的保护范围应该以权利要求书的保护范围为准。

Claims

权利要求书
1、 一种光功率测量的方法， 所述方法用于包括光线路终端 0LT和多个光网 络单元 0NU的千兆比特无源光网络 GP0N网络， 其特征在于， 包括：
生成物理层操作维护管理 PL0AM消息， 其中， 所述 PL0AM消息承载于 GP0N传 输汇聚层下行帧中下行物理层操作维护管理开销区的 PL0AM域中，所述 PL0AM消 息中包括所述多个 0NU中的待测 0NU的标识和为所述待测 0NU分配的用于发送上 行光信号的时间区间的信息， 以便所述待测 0NU在所述时间区间向所述 0LT发送 上行光信号， 所述多个 0NU中其它 0NU在所述时间区间不向所述 0LT发送上行光 信号；
将所述 PL0AM消息发送给所述多个 0NU;
接收所述待测 0NU在所述被分配的时间区间内发送的上行光信号； 检测接 收到的所述上行光信号， 确定所述上行光信号的光功率。
2、 如权利要求 1所述的方法， 其特征在于， 所述生成 PL0AM消息包括： 给所述待测 0NU分配发送上行光信号的时间区间， 并将所述待测 0NU的标识 和所述时间区间的信息封装到所述 PL0AM消息中。
3、 如权利要求 2所述的方法， 其特征在于， 所述给所述待测 0NU分配发送 上行光信号的时间区间之前还包括：
获取包含待测 0NU标识的突发光功率测量命令。
4、 如权利要求 1至 3任一项所述的方法， 其特征在于， 所述接收所述待测 0NU在所述被分配的时间区间内发送的上行光信号， 包括：
根据所述时间区间的信息确定接收所述待测 0NU发送的上行光信号的接收 区间， 在所述接收区间上接收所述待测 0NU发送的上行光信号。
5、 如权利要求 4所述的方法， 其特征在于， 根据所述时间区间的信息确定 接收所述待测 0NU发送的上行光信号的接收区间具体包括： 检测接收到的上行光信号中携带的 ONU的标识， 当检测到所述上行光信号 中携带的 0NU标识与所述待测 0NU的标识匹配时， 确定接收区间的开始， 将根据 所述时间区间的信息确定的时间长度作为接收区间的长度。
6、 一种光线路终端 0LT， 其特征在于， 包括：
千兆比特无源光网络 GP0N传输汇聚层模块（43) ， 用于生成物理层操作维 护管理 PL0AM消息， 其中， 所述 PL0AM消息承载于 GP0N传输汇聚层下行帧中下行 物理层操作维护管理开销区的 PL0AM域中， 所述 PL0AM消息中包括连接到所述 0LT的多个光网络单元 0NU中的待测 0NU的标识和为所述待测 0NU分配的用于发 送上行光信号的时间区间的信息， 以便所述待测 0NU在所述时间区间向所述 0LT 发送上行光信号， 所述多个 0NU中其它 0NU在所述时间区间不向所述 0LT发送上 行光信号；
发送模块 （44) ， 用于将所述 PL0AM消息发送给所述多个 0NU;
检测模块 （45) ， 用于接收所述待测 0NU在所述时间区间内发送的上行光 信号； 检测接收到的所述上行光信号， 确定所述上行光信号的光功率。
7、 如权利要求 6所述的 0LT， 其特征在于， 进一步包括：
突发光功率测量命令模块 （42 ) ， 用于将携带有待测 0NU标识的突发光功 率测量命令发送给所述 GP0N传输汇聚层模块 （43 ) 。
8、 如权利要求 7所述的 0LT， 其特征在于， 所述 GP0N传输汇聚层模块（43) 包括：
时间分配模块（431 ) ， 用于根据所述突发光功率测量命令， 给待测 0NU分 配用于发送上行光信号的时间区间；
物理层操作维护管理消息封装模块（432) ， 用于将所述待测 0NU的标识和 所述时间区间的信息封装到承载于 GP0N下行帧中下行物理层控制块开销区的 下行物理层操作维护管理域的 PL0AM消息中。
9、 一种光网络单元 0NU， 其特征在于， 包括： 千兆比特无源光网络 GP0N传 输汇聚层模块 （51 ) 、 控制模块 （52) 、 光模块 （53) ; 所述 GPON传输汇聚层模块 （51 ) ， 用于接收并解析来自于光线路终端 0LT 的物理层操作维护管理消息， 从所述物理层操作维护管理消息中得到待测 0NU 的标识，和所述 0LT给所述待测 0NU分配的用于发送上行光信号的时间区间的信 息，所述物理层操作维护管理消息承载于 GP0N下行帧中下行物理层控制块开销 区的下行物理层操作维护管理域；
所述控制模块（52) ， 用于判断所述待测 0NU的标识与自身的 0NU的标识是 否匹配； 若所述待测 0NU的标识与自身的 0NU的标识匹配， 则控制所述光模块 (53)在所述时间区间内发送上行光信号， 若所述待测 0NU的标识与自身的 0NU 的标识不匹配，则控制所述光模块（53)在所述时间区间内不发送上行光信号。
10、 一种无源光网络， 其特征在于， 包括光线路终端 0LT ( 61 ) 和多个光 网络单元 0NU (63 )，所述多个 0NU通过光分配网 0DN (62)连接到所述 0LT ( 61 )； 所述 0LT ( 61 ) 通过所述 0DN ( 62 ) 向所述多个 0NU发送物理层操作维护管 理 PL0AM消息， 其中， 所述物理层操作维护管理消息承载于 GP0N下行帧中的下 行物理层操作维护管理域中，所述 PL0AM消息中携带有待测 0NU的标识和为所述 待测 0NU分配的用于发送上行光信号的时间区间的信息， 以便所述待测 0NU在所 述时间区间向所述 0LT发送上行光信号， 所述多个 0NU中其它 0NU在所述时间区 间不向所述 0LT发送上行光信号；
所述 0LT ( 61 ) ， 还用于接收所述待测 0NU根据所述 PL0AM消息中携带的所 述时间区间信息发送的上行光信号； 检测所述接收到的上行光信号， 确定所述 上行光信号的光功率；
所述多个 0NU中每一个 0NU (63 ) ， 用于接收并解析来自于所述 0LT ( 61 ) 的所述 PL0AM消息， 获得待测 0NU的标识和为所述待测 0NU分配的用于发送上行 光信号的时间区间信息； 确定所述待测 0NU的标识是否与自己的 0NU标识匹配； 若所述待测 0NU的表示和自身的 0NU的标识匹配， 则在所述时间区间内向所述 0LT (61 )发送上行光信号， 若所述待测 0NU的表示和自身的 0NU的标识不匹配， 则在所述时间区间内不向所述 0LT (61 ) 发送上行光信号。
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