WO2014079233A1 - 工作波长的调谐方法及系统 - Google Patents

工作波长的调谐方法及系统 Download PDF

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Publication number
WO2014079233A1
WO2014079233A1 PCT/CN2013/081202 CN2013081202W WO2014079233A1 WO 2014079233 A1 WO2014079233 A1 WO 2014079233A1 CN 2013081202 W CN2013081202 W CN 2013081202W WO 2014079233 A1 WO2014079233 A1 WO 2014079233A1
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WO
WIPO (PCT)
Prior art keywords
olt
onu
port
working wavelength
wavelength value
Prior art date
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PCT/CN2013/081202
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English (en)
French (fr)
Inventor
张伟良
耿丹
马壮
张德智
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中兴通讯股份有限公司
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.)
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP13856976.9A priority Critical patent/EP2924902A4/en
Publication of WO2014079233A1 publication Critical patent/WO2014079233A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
    • 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
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects

Definitions

  • FIG. 1 is a schematic diagram of a topology of a PON system according to the related art.
  • the PON system usually consists of an Optical Line Terminal (OLT) on the central office, an Optical Network Unit (ONU) on the user side, and an Optical Distribution Network (Optical Distribution Network).
  • OLT Optical Line Terminal
  • ONU Optical Network Unit
  • Optical Distribution Network Optical Distribution Network
  • ODN For ODN, a point-to-multipoint network structure is usually used.
  • ODN consists of passive optical components such as single-mode fiber, optical splitter, and optical connector, providing optical transmission media for the physical connection between the OLT and the ONU.
  • PON technology mainly includes Time Division Multiplexing (TDM) PON system, Wavelength Division Multiplexing (WDM) PON system, and Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing).
  • OFDM Orthogonal Frequency Division Multiplexing
  • hybrid PON system may include a wavelength division time division hybrid PON system, a frequency division time division hybrid PON system, and a wavelength division frequency division time division hybrid PON system.
  • the light wavelengths of the respective light emitters are respectively ⁇ (11, ⁇ 2, ..., ⁇ , where ⁇ (11 is the OLT and the first The wavelength used by the ONU to transmit downlink data, ⁇ 2 is the wavelength used by the OLT to transmit downlink data when communicating with the second ONU, ..., ⁇ is the uplink data used when the OLT communicates with the nth ONU.
  • the wavelength of the emitter at each ONU is different from the emission wavelength of the transmitter at other ONUs, for example:
  • the emission wavelength of the transmitter used by the first ONU to send uplink data to the OLT is ⁇ ;
  • the transmitting wavelength of the transmitter used by the ONU to send uplink data to the OLT is ⁇ ;
  • the transmitting wavelength of the transmitter used by the nth ONU to send uplink data to the OLT is ⁇
  • the OLT can be used by the above technology.
  • all ONUs are sent downlink data, and each ONU can also send uplink data at the same time, that is, the OLT and the ONU adopt a point-to-point structure on the optical channel.
  • each subcarrier is C l, C2, ..., Cn, and each subcarrier is orthogonal
  • the OLT modulates the downlink data sent to the first ONU to the first subcarrier (or modulates to the first subcarrier and other subcarriers) On the carrier), the OLT will send to the second
  • the downlink data of the ONU is modulated onto the second subcarrier (or modulated onto the second subcarrier and other subcarriers), ...
  • the OLT modulates the downlink data sent to the nth ONU to the nth subcarrier (or Modulating to the nth subcarrier and other subcarriers)
  • there is no intersection between the subcarriers used for downlink data sent to different ONUs that is, different ONUs use different subcarriers
  • the ONU is used to send uplink data to the OLT.
  • the subcarrier is the same as the subcarrier that the OLT uses to send downlink data to the current ONU.
  • the OLT can send downlink data to all ONUs at the same time.
  • Each ONU can also send uplink data at the same time. That is, the OLT and the ONU adopt a point-to-point structure on the optical channel.
  • 2 is a schematic diagram showing the topology of a wavelength division time division hybrid PON system according to the related art.
  • 3 is a schematic diagram showing the topology of a frequency division time division hybrid PON system according to the related art. As shown in FIG. 2 and FIG.
  • each OLT manages a group of ONUs, and a group of ONUs in a wavelength division time-division hybrid PON system use the same uplink wavelength for transmitting uplink data, and the downlink wavelengths for receiving downlink data are also the same.
  • the subcarriers or subcarrier groups used by a group of ONUs in the time-division hybrid PON system to transmit uplink data are the same, and the subcarriers or subcarrier groups that receive downlink data are also the same.
  • Different ONUs in a group of ONUs are time division multiplexed. Transfer upstream data.
  • the downlink wavelengths (subcarriers or subcarrier groups) of different OLTs are different, and the uplink wavelengths (subcarriers or subcarrier groups) used by each group of ONUs managed by different OLTs are also different.
  • the time-division PON system in the hybrid PON system may be a Gigabit-Capable Passive Optical Network (GPON) system or an Ethernet passive optical network (Ethernet).
  • GPON Gigabit-Capable Passive Optical Network
  • Ethernet Ethernet passive optical network
  • Passive Optical Network referred to as EPON
  • XG-PON 10-Gigabit-capable passive optical network
  • the ONU Due to the load balancing, energy saving and protection switching of the ONU, the ONU needs to adjust the operating wavelength. If the wavelength adjustment of the ONU is done by the OLT command, the OLT needs to first interrogate the wavelength tuning capability of the ONU, thereby increasing the process of OLT and ONU information interaction.
  • the protection switching is implemented, if the OLT does not ask the wavelength tuning capability of the ONU beforehand, and all the ONUs that need to implement the protection switching are tuned to work on another wavelength, because the wavelength tuning ability of each ONU is different, some ONUs may not be able to work. When the wavelength tuning is completed, the protection switching cannot be achieved.
  • the present invention provides a method and system for tuning a working wavelength, so as to at least solve the problem that the OLT cannot quickly complete the wavelength tuning of the ONU without knowing the wavelength tuning capability of the ONU in advance.
  • a method of tuning a working wavelength is provided.
  • the method for tuning the working wavelength according to the present invention includes: the port of the OLT or the OLT acquires the working wavelength value selected by the ONU in the range of the working wavelength to be tuned, wherein the ONU is managed by the OLT, or is the port management of the OLT.
  • the OLT determines the OLT or OLT port that manages the ONU according to the obtained working wavelength value, or the port of the OLT determines the port of the OLT that manages the ONU according to the obtained working wavelength value.
  • the port of the OLT or the OLT obtains the working wavelength value selected by the ONU in the working wavelength range to be tuned: the ONU receives the notification message from the port of the OLT or the OLT, where the notification message carries the work to be tuned.
  • the wavelength range and the bandwidth used by the OLT or OLT for the ONU to report the operating wavelength value.
  • the ONU selects the working wavelength value in the range of the working wavelength to be tuned and reports the working wavelength value in the allocated bandwidth.
  • the method further includes: the ONU tuning the current working wavelength to the working wavelength value.
  • the OLT determines, according to the obtained working wavelength value, that the OLT or the OLT port of the management ONU includes: the OLT determines an OLT or an OLT port of the management ONU corresponding to the working wavelength value; and the OLT notifies the determined management ONU of the identifier information of the ONU.
  • the port of the OLT determines, according to the obtained working wavelength value, the port of the OLT that manages the ONU, the port of the OLT determines the port of the OLT that manages the ONU corresponding to the working wavelength value, and the port of the OLT notifies the identification information of the ONU to the determined port.
  • the port of the OLT that manages the ONU is determined to allocate bandwidth to the ONU according to the identifier information of the ONU.
  • the method further includes: the ONU performing ranging on all wavelengths in the wavelength tuning range of the ONU, and measuring The result is saved; the ONU tunes the current working wavelength to the working wavelength value, and updates the current equalization delay value to the equalization delay value corresponding to the working wavelength value.
  • a tuning system for operating wavelengths is provided.
  • the working wavelength tuning system includes: an OLT; the OLT includes: an obtaining module configured to acquire an operating wavelength value selected by the ONU in a range of operating wavelengths to be tuned, wherein the ONU is managed by the OLT, or The port management of the OLT is configured to determine, according to the obtained working wavelength value, an OLT that manages the ONU or a port that manages the OLT of the ONU.
  • the system further includes: an ONU; the ONU includes: a receiving module, configured to receive a notification message from a port of the OLT or the OLT, where the notification message carries a working wavelength range to be tuned and a port of the OLT or the OLT The bandwidth used by the ONU to report the working wavelength value; the reporting module is set to select the working wavelength value in the range of the working wavelength to be tuned, and report the working wavelength value in the allocated bandwidth; the processing module is set to be The current operating wavelength is tuned to the operating wavelength value, or continues to maintain the current operating wavelength.
  • the determining module includes: a determining unit, configured to determine an OLT or an OLT port of the management ONU corresponding to the working wavelength value; and a notification unit, configured to notify the OLT or the OLT port of the determined management ONU by the identifier information of the ONU, The OLT or OLT port of the determined management ONU allocates bandwidth to the ONU according to the identifier information of the ONU.
  • the ONU further includes: a ranging module configured to perform ranging on all wavelengths in the wavelength tuning range of the ONU, and save the ranging result.
  • the OLT or the OLT uses the port of the OLT or the OLT to obtain the working wavelength value selected by the ONU of the port managed by the OLT or the OLT in the working wavelength range to be tuned; the OLT determines the OLT that manages the ONU according to the obtained working wavelength value or The OLT port, or the port of the OLT determines the port of the OLT that manages the ONU according to the obtained working wavelength value, and solves the problem that the OLT cannot quickly complete the wavelength tuning of the ONU without knowing the wavelength tuning capability of the ONU in advance.
  • the problem is that the ONU can independently select the tuned wavelength according to its own wavelength tuning capability and the tunable wavelength range allocated by the OLT, shortening the time required for the ONU to tune the operating wavelength, and improving the service quality of the passive optical network.
  • FIG. 2 is a schematic diagram of a topology of a wavelength division time division hybrid PON system according to the related art
  • FIG. 3 is a frequency division time division hybrid PON system according to the related art.
  • FIG. 4 is a flowchart of a method for tuning an operating wavelength according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for tuning an operating wavelength according to a preferred embodiment of the present invention
  • 6 is a structural block diagram of a tuning system of an operating wavelength according to an embodiment of the present invention
  • FIG. 7 is a structural block diagram of a tuning system of an operating wavelength according to a preferred embodiment of the present invention.
  • Step S402 The port of the OLT or the OLT acquires the working wavelength value selected by the ONU in the range of the working wavelength to be tuned, where the ONU is managed by the OLT, or It is the port management of the OLT.
  • Step S404 The OLT determines the OLT or OLT port of the management ONU according to the obtained working wavelength value, or the port of the OLT determines the port of the OLT that manages the ONU according to the obtained working wavelength value.
  • the OLT cannot quickly complete the wavelength tuning of the ONU without knowing the wavelength tuning capability of the ONU in advance.
  • the OLT or the OLT uses the port of the OLT or the OLT to obtain the working wavelength value selected by the ONU of the port managed by the OLT or the OLT, and the OLT determines the working wavelength value according to the obtained working wavelength.
  • the OLT or the OLT port of the ONU is managed, or the port of the OLT determines the port of the OLT that manages the ONU according to the obtained working wavelength value, and solves the problem that the OLT cannot quickly complete the wavelength tuning capability of the ONU in advance in the related art.
  • the problem of wavelength tuning of the ONU, and the ONU can independently select the tuned wavelength according to its own wavelength tuning capability and the tunable wavelength range allocated by the OLT, shortening the time required for the ONU to tune the operating wavelength, and improving the passive optical network. Quality of service.
  • the OLT may be a working active OLT or a backup OLT for protecting switching.
  • the port of the OLT or the OLT acquires the working wavelength value selected by the ONU in the working wavelength range to be tuned, and may include the following operations: Step S1: The ONU receives the notification from the port of the OLT or the OLT. a message, where the notification message carries a working wavelength range to be tuned and a bandwidth used by the OLT or OLT port to report the working wavelength value allocated by the ONU; Step S2: The ONU selects the working wavelength value in the range of the working wavelength to be tuned, and reports the working wavelength value in the allocated bandwidth.
  • the OLT informs the ONU that the operating wavelength range can be tuned and the ONU is allocated a bandwidth for reporting the selected operating wavelength; after receiving the above information, the ONU performs the tuning operation of the OLT notification according to its own wavelength tuning capability.
  • the operating wavelength is selected over the range of wavelengths and the selected operating wavelength value is reported to the OLT within the bandwidth allocation described above.
  • the ONU selects the working wavelength value in the range of the operating wavelength range to be tuned, and after reporting the working wavelength value in the allocated bandwidth, the ONU may further include the following steps: Step S3: The ONU will be the current working wavelength. Tuned to the operating wavelength value.
  • the OLT determines that the OLT or the OLT port that manages the ONU according to the obtained working wavelength value may include the following processing: Step S4: The OLT determines an OLT or an OLT port of the management ONU corresponding to the working wavelength value; Step S5 The OLT notifies the OLT or the OLT port of the identified ONU, and the OLT or OLT port of the determined management ONU allocates bandwidth to the ONU according to the identification information of the ONU.
  • the port of the OLT determines that the port of the OLT that manages the ONU according to the obtained working wavelength value may include the following operations: Step S6: The port of the OLT determines a port of the OLT that manages the ONU corresponding to the working wavelength value; Step S7: The port of the OLT notifies the identifier of the ONU to the port of the OLT that manages the ONU. The port of the OLT that manages the ONU determines the bandwidth allocated to the ONU according to the identifier information of the ONU.
  • the OLT after receiving the selected working wavelength value reported by the ONU, notifies the OLT of the ONU to the OLT corresponding to the working wavelength value, and the OLT corresponding to the working wavelength value allocates bandwidth to the ONU.
  • the ONU responds to the above bandwidth allocation with the updated EqD value.
  • Step S402 before the port of the OLT or the OLT acquires the working wavelength value selected by the ONU in the operating wavelength range to be tuned, the following steps may be further included: Step S8: The ONU is within the wavelength tuning range of the ONU Ranging all wavelengths and saving the ranging results; Step S9: The ONU tunes the current working wavelength to the working wavelength value, and updates the current equalization delay value to an equalization delay value corresponding to the working wavelength value.
  • the ONU completes the ranging at all wavelengths within its own wavelength tuning capability before the OLT informs the ONU that it can tune the range of operating wavelengths, and stores the ranging result; ONU selects the operating wavelength, ONU The operating wavelength is tuned to the above operating wavelength, and the local equalization delay value (EqD) is updated to the EqD value corresponding to the above operating wavelength.
  • EqD local equalization delay value
  • Step S502 The ONU is in the registration activation process or the running state. The idle phase completes the ranging at all wavelengths within its own wavelength tuning range, and saves the ranging result;
  • Step S504 The OLT (primary or standby) sends a broadcast physical layer operation management and maintenance to all ONUs managed by itself ( PLOAM) message, the content of which is: the range of working wavelengths that the ONU can tune, and the OLT allocates bandwidth for reporting all selected operating wavelengths to all ONUs; after receiving the above message, the ONU is within the above range according to its own wavelength tuning capability.
  • PLOAM physical layer operation management and maintenance
  • the OLT in this step may be the active OLT in operation; Into account the protection switching, this step may be a standby OLT OLT. If the standby OLT is different from the primary OLT, the standby OLT adjusts its working wavelength to the working wavelength of the primary OLT, and the standby OLT sends a broadcast PLOAM message to all ONUs managed by the primary OLT. In the preferred embodiment, the broadcast PLOAM message is used in this step.
  • Mode 1 The OLT may send a unicast PLOAM to all ONUs managed by the OLT.
  • the OLT can transmit the tunable working wavelength range to the ONU through the ONU Management and Control Interface (OMCI) message.
  • the third mode can be tuned by the OLT to the ONU through the bandwidth allocation.
  • the working wavelength range After receiving the selected working wavelength value reported by the ONU, the OLT notifies the OLT of the ONU to the OLT corresponding to the working wavelength value, and the OLT corresponding to the working wavelength value allocates bandwidth to the ONU, the ONU The above bandwidth allocation is responded to with the updated EqD value.
  • the working wavelength tuning system may include: an OLT 10; the OLT 10 may include: an obtaining module 100 configured to obtain an operating wavelength value selected by the ONU in a working wavelength range to be tuned, wherein the ONU It is managed by the OLT, or is the port management of the OLT.
  • the determining module 102 is configured to determine an OLT that manages the ONU or a port that manages the OLT of the ONU according to the obtained working wavelength value.
  • the tunable wavelength range autonomously selects the tuned wavelength, shortens the time required for the ONU to tune the operating wavelength, and improves the quality of service of the passive optical network.
  • the system may further include: an ONU 20; the ONU 20 may include: a receiving module 200, configured to receive a notification message from a port of the OLT or the OLT, where the notification message carries the to-be-tuned
  • the working wavelength value is reported internally; the processing module 204 is configured to tune the current working wavelength to the working wavelength value, or to continue to maintain the current working wavelength.
  • a receiving module 200 configured to receive a notification message from a port of the OLT or the OLT, where the notification message carries the to-be-tuned
  • the reporting module 202 is configured to select the working wavelength value in the working wavelength range to be tuned, and allocate the bandwidth.
  • the determining module 102 may include: a determining unit 1020, configured to determine an OLT or an OLT port of the management ONU corresponding to the working wavelength value; and the notifying unit 1022, configured to notify the identifier information of the ONU The determined OLT or OLT port of the management ONU, wherein the determined OLT or OLT port of the management ONU allocates bandwidth to the ONU according to the identifier information of the ONU.
  • the ONU 20 may further include: a ranging module 206 configured to perform ranging on all wavelengths in the wavelength tuning range of the ONU, and save the ranging result.
  • the wavelength of the ONU that the OLT cannot know in advance in the related art is solved.
  • tuning capability the problem of wavelength tuning of the ONU cannot be completed quickly, and the ONU can independently select the tuned wavelength according to its own wavelength tuning capability and the tunable wavelength range allocated by the OLT, which shortens the consumption required for the ONU tuning operating wavelength.
  • the time has improved the quality of service of passive optical networks.
  • the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
  • the computing device may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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Abstract

本发明公开了一种工作波长的调谐方法及系统，在上述方法中，OLT或者OLT的端口获取ONU在待调谐的工作波长取值范围中选取的工作波长值，其中，ONU是OLT管理的，或者，是OLT的端口管理的；OLT根据获取到的工作波长值确定管理ONU的OLT或者OLT端口，或者，OLT的端口根据获取到的工作波长值确定管理ONU的OLT的端口。根据本发明提供的技术方案，缩短了ONU调谐工作波长所需要消耗的时间，提高了无源光网络的服务质量。

Description

工作波长的调谐方法及系统
技术领域 本发明涉及通信领域， 具体而言， 涉及一种工作波长的调谐方法及系统。 背景技术 随着网络技术的飞速发展， 可以利用网络传输大量的语音、 数据、 视频等业务， 因此对带宽的要求不断提高， 无源光网络 （Passive Optical Network, 简称为 PON) 在 这种需求下应运而生。 图 1是根据相关技术的 PON系统的拓扑结构示意图。 如图 1所示， PON系统通 常由局侧的光线路终端 （Optical Line Terminal, 简称为 OLT)、 用户侧的光网络单元 ( Optical Network Unit, 简称为 ONU) 和光分配网络 ( Optical Distribution Network, 简称为 ODN) 组成， 通常采用点到多点的网络结构。 ODN由单模光纤、 光分路器以 及光连接器等无源光器件组成， 为 OLT和 ONU之间的物理连接提供光传输媒质。 目 前， PON技术中主要有时分复用 （Time Division Multiplexing, 简称为 TDM ) PON系 统、 波分复用 （Wavelength Division Multiplexing, 简称为 WDM) PON系统、 正交频 分复用（ Orthogonal Frequency Division Multiplexing， 简称为 OFDM ) PON系统和混合 PON系统。 混合 PON系统可以包括波分时分混合 PON系统、 频分时分混合 PON系 统以及波分频分时分混合 PON系统。 在 WDM-PON系统中， OLT处有多个不同波长的光发射器，各个光发射器的光波 长分别为 λ(11， λά2, ...， λάη, 其中， λ(11为 OLT与第一个 ONU通信时发送下行数据 所采用的波长， λά2为 OLT与第二个 ONU通信时发送下行数据所采用的波长， ... , λάη 为 OLT与第 η个 ONU通信时发送下行数据所采用的波长； 每个 ONU处的发射器的 发生波长均不同于其他 ONU处发射器的发射波长， 例如： 第一个 ONU用于给 OLT 发送上行数据的发射器的发射波长为 λι;1， 第二个 ONU用于给 OLT发送上行数据的 发射器的发射波长为 λι;2， ...， 第 η个 ONU用于给 OLT发送上行数据的发射器的发 射波长为 λιηι, 采用上述技术， OLT可以同时给所有 ONU发送下行数据， 每个 ONU 也可以同时发送上行数据， 即 OLT和 ONU在光通道上采用的是点到点的结构。 在 OFDM-PON系统中， OLT处有多个不同的子载波， 各个子载波分别为 C l， C2， ...， Cn, 且各个子载波是正交的， OLT将发送给第一个 ONU的下行数据调制到 第一个子载波上 （或者调制到第一个子载波和其他子载波上）， OLT 将发送给第二个 ONU 的下行数据调制到第二个子载波上 （或者调制到第二个子载波和其他子载波 上）， ...， OLT将发送给第 n个 ONU的下行数据调制到第 n个子载波上 （或者调制到 第 n个子载波和其他子载波上）， 发送给不同 ONU的下行数据所采用的子载波之间没 有交集， 即不同的 ONU使用不同的子载波， ONU处用于给 OLT发送上行数据的子载 波与 OLT采用给当前 ONU发送下行数据的子载波相同。 采用上述技术， OLT可以同 时给所有 ONU发送下行数据， 每个 ONU也可以同时发送上行数据， 即 OLT和 ONU 在光通道上是采用点到点的结构。 图 2是根据相关技术的波分时分混合 PON系统的拓扑结构示意图。图 3是根据相 关技术的频分时分混合 PON系统的拓扑结构示意图。 如图 2和图 3所示， 每个 OLT 管理一组 ONU，波分时分混合 PON系统中的一组 ONU用于发送上行数据的上行波长 相同， 并且接收下行数据的下行波长也相同， 频分时分混合 PON系统中的一组 ONU 用于发送上行数据的子载波或者子载波组相同， 并且接收下行数据的子载波或者子载 波组也相同， 一组 ONU中的不同 ONU通过时分复用的方式传输上行数据。不同 OLT 的下行波长 （子载波或者子载波组） 不同， 不同 OLT管理的每组 ONU使用的上行波 长 （子载波或者子载波组） 也不同。 在 WDM-PON和混合 PON系统中， 其中， 混合 PON系统中的时分 PON系统可 以为吉比特无源光网络 （Gigabit-Capable Passive Optical Network, 简称为 GPON) 系 统、 以太网无源光网络 （Ethernet Passive Optical Network, 简称为 EPON) 系统、 10G 能力的无源光网络 ( 10-Gigabit-capable passive optical network, 简称为 XG-PON)系统 以及 10G 能力的以太网无源光网络（10-Gigabit-capable EPON)系统。由于考虑到 ONU 的负载均衡、 节能和实现保护倒换的目的， 因此 ONU需要调整工作波长。 如果 ONU 的波长调整是通过 OLT命令完成的， 那么 OLT需要首先询问 ONU的波长调谐能力， 由此增加了 OLT和 ONU信息交互的过程。在实现保护倒换时， 如果 OLT事先不询问 ONU的波长调谐能力， 并且命令需要实施保护倒换的所有 ONU调谐到另外一个波长 上进行工作， 由于每个 ONU的波长调谐能力不同， 可能导致部分 ONU不能完成波长 调谐， 即不能实现保护倒换。 发明内容 本发明提供了一种工作波长的调谐方法及系统， 以至少解决相关技术中 OLT在预 先无法获知 ONU的波长调谐能力的情况下， 不能快速完成 ONU的波长调谐的问题。 根据本发明的一个方面， 提供了一种工作波长的调谐方法。 根据本发明的工作波长的调谐方法包括： OLT或者 OLT的端口获取 ONU在待调 谐的工作波长取值范围中选取的工作波长值， 其中， ONU是 OLT管理的， 或者， 是 OLT的端口管理的； OLT根据获取到的工作波长值确定管理 ONU的 OLT或者 OLT 端口， 或者， OLT的端口根据获取到的工作波长值确定管理 ONU的 OLT的端口。 优选地， OLT或者 OLT的端口获取 ONU在待调谐的工作波长取值范围中选取的 工作波长值包括： ONU接收来自于 OLT或者 OLT的端口的通知消息， 其中， 通知消 息中携带有待调谐的工作波长取值范围以及 OLT或者 OLT的端口为 ONU分配的上报 工作波长值所使用的带宽； ONU在待调谐的工作波长取值范围中选取工作波长值， 并 在分配的带宽内上报工作波长值。 优选地， 在 ONU在待调谐的工作波长取值范围中选取工作波长值， 并在分配的 带宽内上报工作波长值之后， 还包括： ONU将当前的工作波长调谐为工作波长值。 优选地， OLT根据获取到的工作波长值确定管理 ONU的 OLT或者 OLT端口包括： OLT确定与工作波长值对应的管理 ONU的 OLT或者 OLT端口； OLT将 ONU的标识 信息通知给确定后的管理 ONU的 OLT或者 OLT端口， 其中， 确定后的管理 ONU的 OLT或者 OLT端口根据 ONU的标识信息为 ONU分配带宽。 优选地，OLT的端口根据获取到的工作波长值确定管理 ONU的 OLT的端口包括： OLT的端口确定与工作波长值对应的管理 ONU的 OLT的端口； OLT的端口将 ONU 的标识信息通知给确定后的管理 ONU的 OLT的端口， 其中， 确定后的管理 ONU的 OLT的端口根据 ONU的标识信息为 ONU分配带宽。 优选地，在 OLT或者 OLT的端口获取 ONU在待调谐的工作波长取值范围中选取 的工作波长值之前，还包括： ONU对该 ONU的波长调谐范围内的全部波长进行测距， 并将测距结果进行保存； ONU将当前的工作波长调谐为工作波长值， 并将当前的均衡 时延值更新为与工作波长值对应的均衡时延值。 根据本发明的另一方面， 提供了一种工作波长的调谐系统。 根据本发明的工作波长的调谐系统包括： OLT; OLT包括： 获取模块， 设置为获 取 ONU在待调谐的工作波长取值范围中选取的工作波长值， 其中， ONU是 OLT管理 的， 或者， 是 OLT的端口管理的； 确定模块， 设置为根据获取到的工作波长值确定管 理 ONU的 OLT或者管理 ONU的 OLT的端口。 优选地， 上述系统还包括： ONU; ONU包括： 接收模块， 设置为接收来自于 OLT 或者 OLT的端口的通知消息， 其中， 通知消息中携带有待调谐的工作波长取值范围以 及 OLT或者 OLT的端口为 ONU分配的上报工作波长值所使用的带宽； 上报模块， 设 置为在待调谐的工作波长取值范围中选取工作波长值， 并在分配的带宽内上报工作波 长值； 处理模块， 设置为将当前的工作波长调谐为工作波长值， 或者， 继续保持当前 的工作波长。 优选地， 确定模块包括： 确定单元， 设置为确定与工作波长值对应的管理 ONU 的 OLT或者 OLT端口； 通知单元， 设置为将 ONU的标识信息通知给确定后的管理 ONU的 OLT或者 OLT端口， 其中， 确定后的管理 ONU的 OLT或者 OLT端口根据 ONU的标识信息为 ONU分配带宽。 优选地， 上述 ONU还包括： 测距模块， 设置为对 ONU的波长调谐范围内的全部 波长进行测距， 并将测距结果进行保存。 通过本发明，采用 OLT或者 OLT的端口获取该 OLT或者 OLT的端口管理的 ONU 在待调谐的工作波长取值范围中选取的工作波长值； OLT根据获取到的工作波长值确 定管理 ONU的 OLT或者 OLT端口， 或者， OLT的端口根据获取到的工作波长值确定 管理 ONU的 OLT的端口， 解决了相关技术中 OLT在预先无法获知 ONU的波长调谐 能力的情况下， 不能快速完成 ONU的波长调谐的问题， 进而 ONU可以根据自身的波 长调谐能力和 OLT分配的可调谐的波长范围自主选择调谐后的波长， 缩短了 ONU调 谐工作波长所需要消耗的时间， 提高了无源光网络的服务质量。 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， 本发 明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不当限定。 在附图 中- 图 1是根据相关技术的 PON系统的拓扑结构示意图； 图 2是根据相关技术的波分时分混合 PON系统的拓扑结构示意图； 图 3是根据相关技术的频分时分混合 PON系统的拓扑结构示意图； 图 4是根据本发明实施例的工作波长的调谐方法的流程图； 图 5是根据本发明优选实施例的工作波长的调谐方法的流程图； 图 6是根据本发明实施例的工作波长的调谐系统的结构框图； 以及 图 7是根据本发明优选实施例的工作波长的调谐系统的结构框图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在不冲突的 情况下， 本申请中的实施例及实施例中的特征可以相互组合。 图 4是根据本发明实施例的工作波长的调谐方法的流程图。 如图 4所示， 该方法 可以包括以下处理步骤： 步骤 S402: OLT或者 OLT的端口获取 ONU在待调谐的工作波长取值范围中选取 的工作波长值， 其中， ONU是 OLT管理的， 或者， 是 OLT的端口管理的； 步骤 S404: OLT根据获取到的工作波长值确定管理 ONU的 OLT或者 OLT端口， 或者， OLT的端口根据获取到的工作波长值确定管理 ONU的 OLT的端口。 相关技术中， OLT在预先无法获知 ONU的波长调谐能力的情况下， 不能快速完 成 ONU的波长调谐。采用如图 4所示的方法，采用 OLT或者 OLT的端口获取该 OLT 或者 OLT的端口管理的 ONU在待调谐的工作波长取值范围中选取的工作波长值; OLT 根据获取到的工作波长值确定管理 ONU的 OLT或者 OLT端口， 或者， OLT的端口根 据获取到的工作波长值确定管理 ONU的 OLT的端口，解决了相关技术中 OLT在预先 无法获知 ONU的波长调谐能力的情况下， 不能快速完成 ONU的波长调谐的问题， 进 而 ONU可以根据自身的波长调谐能力和 OLT分配的可调谐的波长范围自主选择调谐 后的波长， 缩短了 ONU调谐工作波长所需要消耗的时间， 提高了无源光网络的服务 质量。 在优选实施过程中， 上述 OLT可以为工作中的主用 OLT或者用于保护倒换的备 用 OLT。 优选地， 在步骤 S402中， OLT或者 OLT的端口获取 ONU在待调谐的工作波长 取值范围中选取的工作波长值可以包括以下操作： 步骤 S 1： ONU接收来自于 OLT或者 OLT的端口的通知消息， 其中， 通知消息中 携带有待调谐的工作波长取值范围以及 OLT或者 OLT的端口为 ONU分配的上报工作 波长值所使用的带宽； 步骤 S2: ONU在待调谐的工作波长取值范围中选取工作波长值， 并在分配的带 宽内上报工作波长值。 在优选实施例中， OLT通知 ONU可以调谐工作波长的范围， 并给 ONU分配用于 汇报已选择工作波长的带宽； ONU收到上述信息后， 根据自身的波长调谐能力在上述 OLT通知的调谐工作波长的范围内选择工作波长， 并将选择的工作波长值在上述带宽 分配内汇报给 OLT。 优选地， 在步骤 S2， ONU在待调谐的工作波长取值范围中选取工作波长值， 并 在分配的带宽内上报工作波长值之后， 还可以包括以下步骤： 步骤 S3: ONU将当前的工作波长调谐为工作波长值。 优选地， 在步骤 S404中， OLT根据获取到的工作波长值确定管理 ONU的 OLT 或者 OLT端口可以包括以下处理： 步骤 S4: OLT确定与工作波长值对应的管理 ONU的 OLT或者 OLT端口； 步骤 S5: OLT将 ONU的标识信息通知给确定后的管理 ONU的 OLT或者 OLT端 口， 其中， 确定后的管理 ONU的 OLT或者 OLT端口根据 ONU的标识信息为 ONU 分配带宽。 优选地， 在步骤 S404中， OLT的端口根据获取到的工作波长值确定管理 ONU的 OLT的端口可以包括以下操作： 步骤 S6: OLT的端口确定与工作波长值对应的管理 ONU的 OLT的端口； 步骤 S7: OLT的端口将 ONU的标识信息通知给确定后的管理 ONU的 OLT的端 口，其中，确定后的管理 ONU的 OLT的端口根据 ONU的标识信息为 ONU分配带宽。 在优选实施例中， OLT收到 ONU汇报的已经选择的工作波长值后， 将该 ONU的 标识值通知给与该工作波长值对应的 OLT， 对应该工作波长值的 OLT为 ONU分配带 宽， 上述 ONU采用更新后的 EqD值响应上述带宽分配。 优选地， 在步骤 S402， OLT或者 OLT的端口获取 ONU在待调谐的工作波长取值 范围中选取的工作波长值之前， 还可以包括以下步骤： 步骤 S8: ONU对该 ONU的波长调谐范围内的全部波长进行测距， 并将测距结果 进行保存； 步骤 S9: ONU将当前的工作波长调谐为工作波长值， 并将当前的均衡时延值更 新为与工作波长值对应的均衡时延值。 在优选实施例中， 在 OLT通知 ONU可以调谐工作波长的范围之前， ONU在自身 的波长调谐能力内的所有波长处都完成了测距， 并存储了测距结果； ONU选择工作波 长后， ONU将自身工作波长调谐为上述工作波长， 并将本地的均衡时延值 （EqD) 更 新为与上述工作波长对应的 EqD值。 下面结合图 5所示的优选实施方式对上述优选实施过程做进一步的描述。 图 5是根据本发明优选实施例的工作波长的调谐方法的流程图。 当考虑到负载均 衡、 节能和保护倒换时， ONU需要调谐工作波长， 如图 5所示， OLT和 ONU可以采 用下述步骤完成 ONU的波长调谐： 步骤 S502: ONU在注册激活过程或者运行状态中的空闲阶段完成在自身波长调 谐范围内所有波长处的测距， 并保存测距结果； 步骤 S504: OLT (主用或者备用） 向自身管理的全部 ONU发送一个广播的物理 层操作管理和维护 （PLOAM) 消息， 其内容为： ONU可以调谐的工作波长的范围， 并且 OLT给所有 ONU分配用于汇报已选择工作波长的带宽； ONU收到上述消息后， 根据自身的波长调谐能力在上述范围内选择一个工作波长， 并将选择的工作波长值在 上述带宽分配内汇报给 OLT; 然后 ONU开始进行波长调谐， 并将本地的 EqD值更新 为与上述工作波长对应的 EqD值； 在该优选实施例中， 当考虑到负载均衡和节能时， 该步骤中的 OLT可以为工作中 的主用 OLT; 当考虑到保护倒换时， 该步骤中的 OLT可以为备用 OLT。如果备用 OLT 与主用 OLT不同， 则备用 OLT将自身的工作波长调整为主用 OLT的工作波长， 备用 OLT向主用 OLT管理的所有 ONU发送一个广播 PLOAM消息。 在该优选实施例中， 该步骤中采用的是广播 PLOAM消息， 在其他优选实施例中 还可以采用如下方式进行处理： 方式一、可以采用 OLT向其管理的所有 ONU分别发送一个单播的 PLOAM消息； 方式二、可以采用 OLT通过 ONU管理与控制接口（ONU Management and Control Interface, 简称为 OMCI) 消息向 ONU传输可以调谐的工作波长范围； 方式三、 可以采用 OLT通过带宽分配向 ONU传输可以调谐的工作波长范围。 步骤 S506: OLT收到 ONU汇报的已经选出的工作波长值后， 将该 ONU的标识 值通知给与该工作波长值对应的 OLT， 对应该工作波长值的 OLT为上述 ONU分配带 宽， 该 ONU采用更新后的 EqD值响应上述带宽分配。 图 6是根据本发明实施例的工作波长的调谐系统的结构框图。 如图 6所示， 该工 作波长的调谐系统可以包括： OLT 10; OLT 10可以包括： 获取模块 100， 设置为获取 ONU在待调谐的工作波长取值范围中选取的工作波长值，其中， ONU是 OLT管理的， 或者， 是 OLT的端口管理的； 确定模块 102， 设置为根据获取到的工作波长值确定管 理 ONU的 OLT或者管理 ONU的 OLT的端口。 采用如图 6所示的系统， 解决了相关技术中 OLT在预先无法获知 ONU的波长调 谐能力的情况下， 不能快速完成 ONU的波长调谐的问题， 进而 ONU可以根据自身的 波长调谐能力和 OLT分配的可调谐的波长范围自主选择调谐后的波长， 缩短了 ONU 调谐工作波长所需要消耗的时间， 提高了无源光网络的服务质量。 优选地， 如图 7所示， 上述系统还可以包括： ONU 20; ONU 20可以包括： 接收 模块 200， 设置为接收来自于 OLT或者 OLT的端口的通知消息， 其中， 通知消息中携 带有待调谐的工作波长取值范围以及 OLT或者 OLT的端口为 ONU分配的上报工作波 长值所使用的带宽； 上报模块 202， 设置为在待调谐的工作波长取值范围中选取工作 波长值， 并在分配的带宽内上报工作波长值； 处理模块 204， 设置为将当前的工作波 长调谐为工作波长值， 或者， 继续保持当前的工作波长。 优选地， 如图 7所示， 上述确定模块 102可以包括： 确定单元 1020， 设置为确定 与工作波长值对应的管理 ONU的 OLT或者 OLT端口；通知单元 1022，设置为将 ONU 的标识信息通知给确定后的管理 ONU的 OLT或者 OLT端口， 其中， 确定后的管理 ONU的 OLT或者 OLT端口根据 ONU的标识信息为 ONU分配带宽。 优选地， 如图 7所示， 上述 ONU 20还可以包括： 测距模块 206， 设置为对 ONU 的波长调谐范围内的全部波长进行测距， 并将测距结果进行保存。 从以上的描述中， 可以看出， 上述实施例实现了如下技术效果 （需要说明的是这 些效果是某些优选实施例可以达到的效果）： 解决了相关技术中 OLT在预先无法获知 ONU的波长调谐能力的情况下， 不能快速完成 ONU的波长调谐的问题， 进而 ONU 可以根据自身的波长调谐能力和 OLT 分配的可调谐的波长范围自主选择调谐后的波 长， 缩短了 ONU调谐工作波长所需要消耗的时间， 提高了无源光网络的服务质量。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布在多个计算装置所 组成的网络上， 可选地， 它们可以用计算装置可执行的程序代码来实现， 从而， 可以 将它们存储在存储装置中由计算装置来执行， 并且在某些情况下， 可以以不同于此处 的顺序执行所示出或描述的步骤， 或者将它们分别制作成各个集成电路模块， 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样， 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域的技 术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内， 所作的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种工作波长的调谐方法， 包括：
光线路终端 OLT或者所述 OLT的端口获取光网络单元 ONU在待调谐的工 作波长取值范围中选取的工作波长值， 其中， 所述 ONU是所述 OLT管理的， 或者， 是所述 OLT的端口管理的；
所述 OLT根据获取到的所述工作波长值确定管理所述 ONU的 OLT或者 OLT端口，或者，所述 OLT的端口根据获取到的所述工作波长值确定管理所述 ONU的所述 OLT的端口。
2. 根据权利要求 1所述的方法， 其中， 所述 OLT或者所述 OLT的端口获取所述 ONU在所述待调谐的工作波长取值范围中选取的所述工作波长值包括：
所述 ONU接收来自于所述 OLT或者所述 OLT的端口的通知消息， 其中， 所述通知消息中携带有所述待调谐的工作波长取值范围以及所述 OLT 或者所 述 OLT的端口为所述 ONU分配的上报所述工作波长值所使用的带宽；
所述 ONU在所述待调谐的工作波长取值范围中选取所述工作波长值， 并 在分配的所述带宽内上报所述工作波长值。
3. 根据权利要求 2所述的方法， 其中， 在所述 ONU在所述待调谐的工作波长取 值范围中选取所述工作波长值， 并在分配的所述带宽内上报所述工作波长值之 后， 还包括：
所述 ONU将当前的工作波长调谐为所述工作波长值。
4. 根据权利要求 1所述的方法， 其中， 所述 OLT根据获取到的所述工作波长值确 定管理所述 ONU的 OLT或者 OLT端口包括：
所述 OLT确定与所述工作波长值对应的管理所述 ONU的 OLT或者 OLT 端口；
所述 OLT将所述 ONU的标识信息通知给确定后的管理所述 ONU的 OLT 或者 OLT端口， 其中， 确定后的管理所述 ONU的 OLT或者 OLT端口根据所 述 ONU的标识信息为所述 ONU分配带宽。
5. 根据权利要求 1所述的方法， 其中， 所述 OLT的端口根据获取到的所述工作波 长值确定管理所述 ONU的所述 OLT的端口包括： 所述 OLT的端口确定与所述工作波长值对应的管理所述 ONU的所述 OLT 的端口；
所述 OLT的端口将所述 ONU的标识信息通知给确定后的管理所述 ONU 的所述 OLT的端口， 其中， 确定后的管理所述 ONU的所述 OLT的端口根据所 述 ONU的标识信息为所述 ONU分配带宽。
6. 根据权利要求 2所述的方法， 其中， 在所述 OLT或者所述 OLT的端口获取所 述 ONU在所述待调谐的工作波长取值范围中选取的所述工作波长值之前， 还 包括：
所述 ONU对该 ONU的波长调谐范围内的全部波长进行测距，并将测距结 果进行保存；
所述 ONU将当前的工作波长调谐为所述工作波长值， 并将当前的均衡时 延值更新为与所述工作波长值对应的均衡时延值。
7. 一种工作波长的调谐系统， 所述系统包括： 光线路终端 OLT;
所述 OLT包括：
获取模块， 设置为获取光网络单元 ONU在待调谐的工作波长取值范围中 选取的工作波长值， 其中， 所述 ONU是所述 OLT管理的， 或者， 是所述 OLT 的端口管理的；
确定模块，设置为根据获取到的所述工作波长值确定管理所述 ONU的 OLT 或者管理所述 ONU的所述 OLT的端口。
8. 根据权利要求 7所述的系统， 其中， 所述系统还包括： 所述 ONU;
所述 ONU包括：
接收模块， 设置为接收来自于所述 OLT或者所述 OLT的端口的通知消息， 其中，所述通知消息中携带有所述待调谐的工作波长取值范围以及所述 OLT或 者所述 OLT的端口为所述 ONU分配的上报所述工作波长值所使用的带宽； 上报模块， 设置为在所述待调谐的工作波长取值范围中选取所述工作波长 值， 并在分配的所述带宽内上报所述工作波长值；
处理模块， 设置为将当前的工作波长调谐为所述工作波长值， 或者， 继续 保持所述当前的工作波长。
9. 根据权利要求 7所述的系统， 其中， 所述确定模块包括: 确定单元， 设置为确定与所述工作波长值对应的管理所述 ONU的 OLT或 者 OLT端口；
通知单元， 设置为将所述 ONU的标识信息通知给确定后的管理所述 ONU 的 OLT或者 OLT端口， 其中， 确定后的管理所述 ONU的 OLT或者 OLT端口 根据所述 ONU的标识信息为所述 ONU分配带宽。 根据权利要求 8所述的系统， 其中， 所述 ONU还包括：
测距模块， 设置为对所述 ONU的波长调谐范围内的全部波长进行测距， 并将测距结果进行保存。
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