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CN103281622A - Multi-wavelength passive optical network system - Google Patents

Multi-wavelength passive optical network system Download PDF

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CN103281622A
CN103281622A CN 201310246658 CN201310246658A CN103281622A CN 103281622 A CN103281622 A CN 103281622A CN 201310246658 CN201310246658 CN 201310246658 CN 201310246658 A CN201310246658 A CN 201310246658A CN 103281622 A CN103281622 A CN 103281622A
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optical
network
downlink
level
branch
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CN 201310246658
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Chinese (zh)
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谭讯
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苏州彩云飞电子有限公司
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Abstract

The invention provides a multi-wavelength passive optical network system. The multi-wavelength passive optical network system comprises an optical line terminal, an optical distribution network and a plurality of optical network units. According to the multi-wavelength passive optical network system, the optical distribution network comprises a first-level optical splitter and a plurality of second-level optical splitters, the uplink public port and the downlink public port of the first-level optical splitter are connected to the optical line terminal through a main uplink optical fiber and a main downlink optical fiber respectively, the downlink branch ports and the uplink branch ports of the first-level optical splitter are connected with downlink branch optical fibers and uplink branch optical fibers respectively and are connected to one group of optical network units through one of the second-level optical splitters, transmission films are plated to the downlink branch ports of the first-level optical splitter respectively, and the different transmission films have different transmission spectrums; the optical line terminal sends a downlink XGTC frame to the optical network, and the frame header of the downlink XGTC frame comprises a wavelength indicating domain which is used for carrying wavelength indicating information.

Description

多波长无源光网络系统 Multi-wavelength passive optical network system

技术领域 FIELD

[0001] 本发明涉及一种光接入技术,特别地,涉及一种多波长无源光网络(PassiveOptical Network, PON)系统。 [0001] The present invention relates to an optical access technology, in particular, to a multi-wavelength passive optical network (PassiveOptical Network, PON) system.

背景技术 Background technique

[0002] 随着用户对带宽需求的不断增长,传统的铜线宽带接入系统越来越面临带宽瓶颈。 [0002] With the growing user demand for bandwidth, the traditional copper broadband access systems are increasingly faced with bandwidth bottlenecks. 与此同时,带宽容量巨大的光纤通信技术日益成熟且应用成本逐年下降,光接入技术,比如无源光网络,逐渐成为下一代宽带接入网的有力竞争者。 At the same time, great bandwidth capacity of optical fiber communications technology matures and declining cost applications, optical access technologies, such as passive optical networks, has become a strong competitor in the next-generation broadband access networks.

[0003] 传统的无源光网络系统,比如吉比特无源光网络(Gigabit-capable PassiveOptical Network, GP0N)系统或者以太网无源光网络(Ethernet Passive OpticalNetwork, ΕΡ0Ν)系统,一般采用点到多点(Point to multiple point, P2MP)的网络架构,即中心局的光线路终端(Optical Line Terminal, 0LT)通过光分配网络(OpticalDistribution Network, 0DN)以点到多点的方式连接到用户侧的多个光网络单元(OpticalNetwork Unit, 0NU)。 [0003] a conventional passive optical network system, such as gigabit passive optical network (Gigabit-capable PassiveOptical Network, GP0N) system or an Ethernet passive optical network (Ethernet Passive OpticalNetwork, ΕΡ0Ν) system, generally use multipoint (Point to multiple point, P2MP) network architecture, i.e., a central office optical line terminal (optical line terminal, 0LT) connected in multipoint manner to a plurality of user side via an optical distribution network (OpticalDistribution network, 0DN) an optical network unit (OpticalNetwork unit, 0NU). 其中,在下行方向,光线路终端采用指定的下行波长以时分复用(TimeDivision Multiplexing, TDM)方式将下行数据传输给光网络单元,每个光网络单元仅接收携带其设备标识的下行数据;而在上行方向,光网络单元采用指定的上行波长以时分多址(Time Division Multiple Access, TDMA)方式将上行数据传输给光线路终端,每个光网络单元仅在光线路终端授权的时隙(Time Slot)进行数据上发。 Wherein, in the downstream direction, the optical line terminal using a time division multiplex downlink wavelength specified (TimeDivision Multiplexing, TDM) manner downlink data transmission to the optical network units, each optical network unit receiving only carry their device identification downlink data; and in the upstream direction, the optical network unit designated upstream wavelength using TDMA (Time division multiple Access, TDMA) mode uplink data to the optical line terminal, each optical network unit in an optical line terminal only authorized time slot (Time slot) performed on the data sent.

[0004] 在上述传统的点到多点无源光网络系统中,由于光网络单元采用时分复用的方式共享光传输介质,在大分支比的网络架构下,时分复用方式的时间分割特性严重影响光网络单元的带宽。 [0004] In the above conventional multipoint passive optical network system, since the optical network units using time-division multiplexing optical transmission medium shared, in a large network architecture branching ratio, time division multiplexing time division characteristic seriously affect the bandwidth of the optical network unit. 因此,随着宽带业务的发展,传统的无源光网络系统无法满足用户对带宽不断增长的需求。 Therefore, with the development of broadband services, the traditional passive optical network system can not meet the user demand for bandwidth is growing.

发明内容 SUMMARY

[0005] 为解决现有技术存在的带宽问题,本发明提供一种多波长无源光网络系统。 [0005] In order to solve the bandwidth problems of the prior art, the present invention provides a multi-wavelength passive optical network system.

[0006] 本发明提供的多波长无源光网络系统,包括光线路终端、光分配网络和多个光网络单元,所述光线路终端通过所述光分配网络以点到多点的方式连接到所述光网络单元;其中,所述多个光网络单元分成多组,每一组光网络单元分别采用不同的上下行波长,所述光分配网络包括第一级分光器和多个第二级分光器,其中所述第一级分光器包括上行公共端口、下行公共端口、多个上行分支端口和多个下行分支端口,其中所述上行公共端口和下行公共端口分别通过上行主干光纤和下行主干光纤连接到所述光线路终端,且所述第一级分光器的下行分支端口和上行分支端口分别连接下行分支光纤和上行分支光纤,并通过其中一个第二级分光器连接到一组光网络单元,所述第一级分光器的下行分支端口分别镀有透射膜,且不同透射膜具有不同的透射谱;其中 [0006] The multi-wavelength passive optical network system according to the present invention is provided, comprising an optical line terminal, an optical distribution network and a plurality of optical network units, the optical line terminal by the optical distribution network in a multipoint connection to the optical network unit; wherein the plurality of optical network units into a plurality of groups, each of the optical network units using different wavelengths of the upper and lower rows, the optical distribution network comprising a first stage splitter and a plurality of second stage beam splitter, wherein the first optical splitter stage including an uplink common port, a downlink common port, a plurality of upstream ports and a plurality of downstream branches branch ports, wherein the uplink and downlink common port through a common port, respectively upstream and downstream trunk fiber backbone an optical fiber connected to the optical line terminal, the downlink and uplink branch ports and branch ports of the first stage are connected to the optical splitter branch fiber downlink and uplink branch fiber, and a second stage is connected to a set of optical splitter network through which means, downstream of the branch port of the first stage beam splitter transmissive film are respectively coated with, and distinct from the transmission of films having different transmission spectra; wherein ,所述光线路终端向所述光网络发送的下行XGTC帧的帧头包括波长指示域,所述波长指示域用于承载波长指示信息。 , The downlink frame header XGTC transmitting the optical line terminal to the optical network comprises a wavelength indication field, the wavelength indication field for carrying information indicative of the wavelength.

[0007] 在本发明提供的多波长无源光网络系统一较佳实施例中,所述多个光网络单元分成四组,且所述第一级分光器包括四个下行分支端口,每个下行分支端口分别对应于其中一组光网络单元,所述四个分支端口分别镀有第一透射膜、第二透射膜、第三透射膜和第四透射膜。 [0007] In the multi-wavelength passive optical network system according to the present invention provides a preferred embodiment, the plurality of optical network units divided into four groups, and the first beam splitter comprises a four stage branch downstream ports, each downstream branch port respectively corresponding to one set of optical network units, the four port branch transmissive film are respectively coated with a first, a second transmissive film, a transmissive film third and a fourth transmissive film.

[0008] 在本发明提供的多波长无源光网络系统一较佳实施例中,所述第一透射膜的中心透射波长为第一组光网络单元的下行波长,所述第二透射膜的中心透射波长为第二组光网络单元的下行波长,所述第三透射膜的中心透射波长为第三组光网络单元的下行波长,所述第四透射膜的中心透射波长为第四组光网络单元的下行波长。 [0008] The multi-wavelength in the passive optical network system of the present invention provides a preferred embodiment, the first transmissive film center transmission wavelength of a first set of downlink wavelength optical network unit, the second transmissive film the center wavelength of the transmission wavelength of the second set of downstream optical network units, the third transmission film center transmission wavelength of the wavelength of the third set of downstream optical network units, the fourth transmission film center transmission wavelength of the fourth group of light the wavelength of the downstream network element.

[0009] 在本发明提供的多波长无源光网络系统一较佳实施例中,所述第一级分光器还包括四个上行分支端口,所述四个分支端口分别连接有上行分支光纤,并分别通过分支耦合器耦合到其对应的下行分支光纤。 [0009] In the multi-wavelength passive optical network system according to the present invention provides a preferred embodiment, the first stage further comprises four uplink beam splitter branch ports, the branch ports are connected to the four branch optical fiber uplink, and are coupled to corresponding downlink branch fibers through the branch coupler.

[0010] 在本发明提供的多波长无源光网络系统一较佳实施例中,所述四个上行分支端口的通道波长分别为所述第一组光网络单元的上行波长、所述第二组光网络单元的上行波长、所述第三组光网络单元的上行波长和所述第四组光网络单元的上行波长。 [0010] In the multi-wavelength passive optical network system according to the present invention provides a preferred embodiment, the four port branch upstream channel wavelength as the first wavelength of upstream optical network unit, respectively, the second wavelength set upstream optical network unit, the third set of upstream wavelength optical network unit of the upstream wavelength and the fourth set of optical network units.

[0011] 在本发明提供的多波长无源光网络系统一较佳实施例中,所述光线路终端包括多个光发射器,其中每个光发射器的发射波长分别其中一组光网络单元的下行波长。 [0011] In a preferred embodiment of the multi-wavelength passive optical network system provided by the embodiment of the present invention, the optical line terminal comprises a plurality of light emitters, each light emitter wherein the emission wavelengths wherein a set of optical network units the downstream wavelength.

[0012] 在本发明提供的多波长无源光网络系统一较佳实施例中,所述光线路终端还包括多个光接收器,其中每个光接收器的接收波长分别其中一组光网络单元的上行波长。 [0012] In the multi-wavelength PON system provided by the present invention a preferred embodiment, the optical line terminal further includes a plurality of optical receivers, wherein each light receiver receives a set of wavelengths of the optical network wherein upstream wavelength units.

[0013] 本发明提供的多波长无源光网络系统将所述光网络单元分成多组,并且在所述第一级分光器的下行分支端口采用镀膜方式实现下行波长分离,并通过所述第一级分光器实现上行波长复用,从而实现分别采用多对上下行波长来分别承载不同组的光网络单元的上下行数据,由此,在同一时间段便可以利用不同波长同时传输多个光网络单元的数据,从而有效提升系统的整体带宽,满足用户的宽带业务对带宽的增长需求。 [0013] The multi-wavelength passive optical network system according to the present invention provides the optical network unit into a plurality of groups, and the use of coated manner downstream wavelength separation stage downstream of the first branch port of the splitter, through the first and a beam splitter to achieve wavelength multiplexing uplink, respectively downlink thereby achieving data of a plurality of vertical rows each wavelength carrying a different set of optical network units, whereby at the same time can simultaneously transmit a plurality of different wavelengths of light data network elements, so as to effectively enhance the overall bandwidth of the system to meet user demand for broadband services increase bandwidth.

附图说明 BRIEF DESCRIPTION

[0014] 为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其它的附图,其中: [0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, as briefly described in the introduction to the accompanying drawings required for use in describing the embodiments. Apparently, the drawings in the following description are only some of the present invention. embodiments, those of ordinary skill in the art is concerned, without creative efforts, you can derive other drawings from such accompanying drawings, wherein:

[0015] 图1是本发明提供的多波长无源光网络系统一种较佳实施例的示意图。 [0015] FIG. 1 is a schematic view of a preferred embodiment of the multi-wavelength passive optical network system according to the present invention is provided.

[0016] 图2为图1所示的多波长无源光网络系统可以采用的下行XGTC帧的一种实施例的帧结构示意图。 [0016] FIG. 2 is a schematic view of the multi-wavelength passive optical network frame structure of a downlink frame may be employed XGTC embodiment of the system shown in FIG. 1.

具体实施方式 detailed description

[0017] 下面将对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅是本发明的一部分实施例,而不是全部的实施例。 [0017] Hereinafter, the present invention will be apparent technical solutions in the embodiments, fully described, obviously, the described embodiments are merely part of embodiments of the present invention rather than all embodiments. 基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例,都属于本发明保护的范围。 Based on the embodiments of the present invention, all other embodiments of ordinary skill in the art without any creative effort shall fall within the scope of the present invention.

[0018] 请参阅图1,其为本发明提供的多波长无源光网络系统一种较佳实施例的示意图。 [0018] Referring to FIG. 1, the multi-wavelength passive optical network system of the present invention, which provides a schematic view of a preferred embodiment. 所述无源光网络系统100包括至少一个光线路终端(OLT)llO、多个光网络单元(ONU) 120-1〜120-n和光分配网络(ODN) 130。 The passive optical network system 100 includes at least one optical line terminal (OLT) llO, a plurality of optical network units (ONU) 120-1~120-n and the optical distribution network (ODN) 130. 所述光线路终端110通过所述光分配网络130以点到多点的形式连接到所述多个光网络单元120-1〜120-n。 The optical line terminal 110, 130 is connected to the plurality of optical network units 120-1~120-n by the optical distribution network in the form of multipoint. 其中,从所述光线路终端110到所述光网络单元120-1〜120-n的方向定义为下行方向,而从所述光网络单元120-1〜120-n到所述光线路终端110的方向为上行方向。 Wherein a direction from 120-1~120-n of the optical line terminal to the optical network unit 110 as a downlink direction, from the optical network unit 120-1~120-n to the optical line terminal 110 direction is the upstream direction.

[0019] 所述无源光网络系统100可以是不需要任何有源器件来实现所述光线路终端110与所述光网络单元120-1〜120-n之间的数据分发的通信网络,比如,在具体实施例中,所述光线路终端110与所述光网络单元120-1〜120-n之间的数据分发可以通过所述光分配网络130中的无源光器件(比如分光器或者复用器)来实现。 [0019] The passive optical network system 100 may be implemented without any active device to the communication network optical line terminal 110 and the data distribution 120-1~120-n between the optical network unit, such as in particular embodiments, the optical line terminal 110 of data between the optical network unit distribution 120-1~120-n and the optical distribution network through the passive optical device 130 (such splitter or multiplexer) to achieve.

[0020] 所述光线路终端110通常位于中心位置(例如中心局Central Off ice, CO),其可以统一管理所述多个光网络单元120-1〜120-n。 [0020] The optical line terminal 110 is typically located at the center position (e.g., a central office Central Off ice, CO), which can be unified management of the plurality of optical network units 120-1~120-n. 所述光线路终端110可以充当所述光网络单元120-1〜120-n与上层网络(图未示)之间的媒介,将从所述上层网络接收到的数据作为下行数据转发到所述光网络单元120-1〜120-n,以及将从所述光网络单元120-1〜120-n接收到的上行数据转发到所述上层网络。 The optical line terminal 110 may act as an intermediary between the upper layer network (not shown) of the optical network unit 120-1~120-n, the data from the upper layer network forwards the received downlink data as to the forwarding the optical network unit 120-1~120-n, and the uplink data received from the optical network unit to 120-1~120-n to the upper layer network.

[0021] 所述光网络单元120-1〜120-n可以分布式地设置在用户侧位置(比如用户驻地)。 [0021] The optical network unit 120-1~120-n may be provided at the user side of the distributed location (such as customer premises). 所述光网络单元120-1〜120-n可以为用于与所述光线路终端110和用户进行通信的网络设备,具体而言,所述光网络单元120-1〜120-n可以充当所述光线路终端110与所述用户之间的媒介,例如,所述光网络单元120-1〜120-n可以将从所述光线路终端110接收到的下行数据转发到所述用户,以及将从所述用户接收到的数据作为上行数据转发到所述光线路终端110。 The optical network unit 120-1~120-n may be a network device for communicating with the optical line terminal 110 and the user, in particular, the optical network unit 120-1~120-n may act as an intermediary between said optical line terminal 110 of the user, e.g., forwarding the optical network unit can 120-1~120-n from the optical line terminal 110 receives downlink data to the user, and the receiving from the user data forwarding to the optical line terminal 110 as the uplink data. 应当理解,所述光网络单元120-1〜120-n的结构与光网络终端(OpticalNetwork Terminal,0NT)相近,因此在本申请文件提供的方案中,光网络单元和光网络终端之间可以互换。 It will be appreciated, the optical network unit 120-1~120-n structure and an optical network terminal (OpticalNetwork Terminal, 0NT) are similar, so in the present application provides the document, may be interchanged between the optical network unit and an optical network terminal .

[0022] 所述光分配网络130可以是一个数据分发系统,其可以包括光纤、光耦合器、光分路器、光复用器和/或其他设备。 [0022] The optical distribution network 130 may be a data distribution system, which may include an optical fiber, an optical coupler, an optical splitter, an optical multiplexer and / or other devices. 在一个实施例中,所述光纤、光稱合器、光分路器、光复用器和/或其他设备可以是无源光器件,具体来说,所述光纤、光耦合器、光分路器、光复用器和/或其他设备可以是在所述光线路终端110和所述光网络单元120-1〜120-n之间分发数据信号是不需要电源支持的器件。 In one embodiment, the optical fiber, said optical coupler, an optical splitter, an optical multiplexer and / or other equipment may be passive optical device, specifically, the optical fiber, optical coupler, an optical splitter , optical multiplexer and / or other devices may be between the optical line terminal 110 and optical network unit 120-1~120-n signal distribution data is not required to support the power supply device. 另外,在其他实施例中,该光分配网络130还可以包括一个或多个处理设备,例如,光放大器或者中继设备(Relay device)。 Further, in other embodiments, the optical distribution network 130 may also include one or more processing devices, e.g., optical amplifier, or a relay device (Relay device). 在如图1所示的分支结构中,所述光分配网络130具体可以从所述光线路终端110延伸到所述多个光网络单元120-1〜120-n,但也可以配置成其他任何点到多点的结构。 In the branch structure shown in Figure 1, the optical distribution network 130 may extend from the specific optical line terminal 110 to the plurality of optical network units 120-1~120-n, but may be configured to any other multipoint configuration.

[0023] 在本发明提供的多波长无源光网络系统中,所述多个光网络单元120-1〜120-n可以分成多组,同一组的光网络单元分别采用同一对上下行波长,并且采用时分复用方式进行复用;不同组的光网络单元采用的上下行波长不同,且不同组的光网络单元之间通过不同波长以波分复用(Wavelength Division Multiplexing, WDM)方式进行复用。 [0023] In the multi-wavelength passive optical network system provided in the present invention, the plurality of optical network units 120-1~120-n may be divided into a plurality of groups, the same group of optical network units respectively upstream and downstream of the same wavelength, and multiplexing time division multiplexing manner; uplink wavelength different from the optical network unit uses different groups, and between different groups of optical network units of different wavelengths to be multiplexed by the WDM (wavelength Division multiplexing, WDM) mode use.

[0024] 如,图1所示的多波长无源光网络系统100可以采用四对上下行波长,为便于描述,以下将所述四对上下行波长分别记为第一上行波长λ ul和第一下行波长Xdl、第二上行波长λ u2和第二下行波长λ d2、第三上行波长λ U3和第三下行波长Xd3、第四上行波长λ U4和第四下行波长Ad4。 [0024] As FIG multi-wavelength passive optical network system 100 shown may be employed wavelength four pairs of uplink and downlink, for convenience of description, the wavelength will be four pairs of upper and lower rows are denoted as a first upstream wavelength λ ul and a downlink wavelength Xdl, the second upstream and second downstream wavelength λ u2 wavelength λ d2, and the third uplink wavelength λ U3 third downlink wavelength Xd3, fourth uplink wavelength λ U4 and a fourth downlink wavelength Ad4. 并且,所述多个光网络单元120-1〜120-n可以分成四组,其中第一组光网络单元的上下行波长分别采用所述第一上行波长λ ul和第一下行波长λ dl,第二组光网络单元的上下行波长分别采用所述第二上行波长λ U2和第二下行波长λ d2,第三组光网络单元的上下行波长分别采用所述第三上行波长λ U3和第三下行波长λ d3,第四组光网络单元的上下行波长分别采用所述第四上行波长XU4和第四下行波长λ d4。 And, the plurality of optical network units 120-1~120-n can be divided into four groups, wherein a first set of uplink and downlink wavelength optical network unit respectively to the first upstream wavelength λ ul and a first downstream wavelength λ dl , wavelength of the second set of uplink and downlink optical network unit respectively to the second upstream and second downstream wavelength λ U2 wavelength λ d2, wavelength of the third set of upper and lower rows of the optical network unit respectively to the third and upstream wavelength λ U3 the third downstream wavelength λ d3, a fourth set of uplink and downlink wavelengths of the optical network unit respectively the fourth and the fourth upstream wavelength XU4 downlink wavelength λ d4.

[0025] 所述光线路终端110包括多个光发射器Txl〜Tx4和多个光接收器Rxl〜Rx4,其中所述光发射器Txl〜Tx4用于向所述光网络单元120-1〜120-η发射下行数据,且所述光发射器Txl〜Τχ4的发射波长分别为所述第一下行波长λ dl、所述第二下行波长λ d2、所述第三下行波长λ d3和所述第四下行波长λ d4 ;所述光接收器Rxl〜Rx4用于接收来自所述光网络单元120-1〜120-η的上行数据,且所述光接收器Rxl〜Rx4的接收波长分别为所述第一上行波长λ ul、所述第二上行波长λ U2、所述第三上行波长λ U3和第四上行波长λ u4。 [0025] The optical line terminal 110 includes a plurality of light emitters and a plurality of light receivers Txl~Tx4 Rxl~Rx4, wherein the light emitter for Txl~Tx4 to the optical network unit 120-1~120 -η transmit downlink data, and the light emission wavelength of the emitter, respectively, of said first Txl~Τχ4 downlink wavelength λ dl, the second downlink wavelength λ d2, the third and the downlink wavelength λ d3 fourth downstream wavelength λ d4; Rxl~Rx4 the optical receiver for receiving upstream data from the ONU 120-1~120-η, and the wavelength of the light receiver receiving respectively the Rxl~Rx4 said first upstream wavelength λ ul, the second uplink wavelength λ U2, the third and fourth uplink wavelength λ U3 upstream wavelength λ u4.

[0026] 所述光发射器Txl〜Tx4可以通过复用器111连接到下行输出端口(未标示),所述复用器111可以将所述光发射器Txl〜Τχ4发射的下行数据进行复用从而形成多波长下行信号。 [0026] Txl~Tx4 the light emitter 111 may be connected through a multiplexer to the downstream output port (not shown), the multiplexer 111 may be the light emitter downlink data transmitted multiplexed Txl~Τχ4 thereby forming a multi-wavelength downlink signals. 所述光接收器Rxl〜Rx4可以通过解复用器112连接到上行输入端口(未标示),所述解复用器112可以将来自所述多个120-1〜120-η并且经过所述光分配网络130传输多波长上行信号携带的上行数据分别解复用到所述光接收器Rxl〜Rx4。 Rxl~Rx4 the light receiver 112 may be connected to the upstream by the demultiplexer input port (not shown), the demultiplexer 112 may be from the plurality of passes and said 120-1~120-η uplink data transmission 130 multi-wavelength optical distribution network carrying the uplink signal are demultiplexed to the optical receiver Rxl~Rx4. 所述上行输入端口和所述下行输出端口可以分别连接到上行主干光纤135和下行主干光纤136,所述下行输出端口将来自所述复用器111的多波长下行信号耦合到所述光分配网络130的下行主干光纤136,所述上行输入端口将来自所述光分配网络的上行主干光纤135的多波长上行信号耦合到所述解复用器112。 The upstream input port and the output port may be connected downstream to the upstream 135 and downstream trunk fiber trunk fiber 136, the downlink multi-wavelength output port 111 of a downlink signal from the multiplexer coupled to the optical distribution network uplink signal in the downlink multi-wavelength optical fiber trunk 130 to 136, the uplink input from the uplink port of the optical distribution network trunk fiber 135 is coupled to the demultiplexer 112.

[0027] 所述光分配网络130可以采用双主干光纤,并具有两级分光架构,其包括第一级分光器131、第二级分光器132-1〜132-4、上行波分复用器133和分支耦合器134-1〜I34-4ο [0027] The optical distribution network 130 can be a dual trunk fiber, and having two spectral architecture comprising a first stage beam splitter 131, beam splitter 132-1~132-4 second stage, the upstream wavelength division multiplexer 133 and the branch coupler 134-1~I34-4ο

[0028] 所述第一级分光器131可以为分光比为2:8的光分路器,其包括两个公共端口和八个分支端口。 [0028] The first stage 131 may be a beam splitter splitting ratio of 2: 8 optical splitter, which includes two eight common port and branch ports. 所述第一级分光器131的其中一个公共端口作为上行公共端口,其通过所述上行主干光纤135连接到所述光线路终端110,另一个公共端口作为下行主干光纤136连接到所述光线路终端110。 The first stage beam splitter 131 wherein a common port as an uplink common port, which is connected to the optical line terminal by the uplink trunk optical fiber 135 110, another common port connected to the optical fiber trunk line 136 as a downlink terminal 110. 并且,所述第一级分光器131的其中四个分支端口作为下行分支端口,并且分别通过下行分支光纤137连接到所述分支耦合器134-1〜134-4,并通过所述分支耦合器134-1〜134-4分别进一步连接到所述第二级分光器132-1〜132-4的公共端口。 And, the first stage beam splitter 131 wherein the four port branch a downlink branch ports, and are respectively connected through branch optical fiber 137 to the downstream branch coupler 134-1~134-4, and through the branch coupler 134-1~134-4 are further connected to the common port of the second splitter stage of 132-1~132-4. 所述第一级分光器131的其余四个分支端口作为上行端口,并且分别通过上行分支光纤137连接到所述分支耦合器134-1〜134-4。 The four remaining branch port of the first stage beam splitter 131 as an uplink port, and respectively connected to the upstream branch coupler by branch optical fiber 137 134-1~134-4. 所述第一级分光器131可以将从所述下行分支光纤136接收到的光信号进行分光处理之后分别从所述下行分支端口输出给所述下行分支光纤,并且将所述上行分支光纤的光信号耦合到所述上行主干光纤135并输出给所述光线路终端110。 After the first stage beam splitter 131 may be received from the downstream optical signal to the branch optical fiber 136 from the spectral processing are outputted to the downstream branch port downlink branch optical fiber, and the light branching optical fiber upstream of the the uplink signal is coupled to the trunk optical fiber 135 and outputs it to the optical line terminal 110.

[0029] 在本实施例中,所述第二级分光器132-1〜132-4可以采用分支比为1:8、1:16、1:32或者1:64的光分路器,即其具有一个公共端口和多个分支端口。 [0029] In the present embodiment, the second stage beam splitter may be employed 132-1~132-4 branching ratio of 1: 8,1: 16, 1: 32 or 1:64 optical splitter, i.e., having a plurality of branch ports and a common port. 每一个第二级分光器132-1〜132-4的分支端口分别通过分布光纤138连接到其中一组光网络单元,其中每一个分布光纤连接所述第二级分光器132-1〜132-4其中一个分支端口和其对应的光网络单元120-1 〜120-η ο Each of the second branch port 132-1~132-4 splitter stage are connected by distribution fiber 138 to which a group of optical network units, wherein each of the fiber distribution connecting said second stage splitter 132-1~132- 4 wherein a branch port and its corresponding optical network units 120-1 ~120-η ο

[0030] 在本实施例中,所述第一级分光器131的四个下行分支端口可以分别镀有第一透射膜、第二透射膜、第三透射膜和第四透射膜,其中所述第一透射膜、所述第二透射膜、所述第三透射膜和所述第四透射膜分别具有不同的透射谱,具体地,所述第一透射膜的中心透射波长可以为所述第一下行波长λ dl,所述第二透射膜的中心透射波长可以为所述第二下行波长λ d2,所述第三透射膜的中心透射波长可以为所述第三下行波长λ d3,所述第四透射膜的中心透射波长可以为所述第四下行波长Xd4。 [0030] In the present embodiment, the first stage of the four downstream splitter 131 may be plated with a first branch port transmissive film, respectively, a second transmissive film, a transmissive film third and a fourth transmissive film, wherein said a first transmissive film, the second transmissive film, the third film and the fourth transmissive transmissive film have different transmission spectra, in particular, the first transmissive film center transmission wavelength of said first may a downlink wavelength λ dl, the center transmission wavelength of the second transmission film may d2 is the second downlink wavelength λ, the center transmission wavelength of the third transmission film d3 may downlink to the third wavelength λ, the said fourth transmissive film center transmission wavelength of said fourth downstream wavelengths may xd4. 基于上述透射膜,所述第一级分光器131便可以实现将来自所述光线路终端110的多波长下行信号中承载的不同波长的下行数据分别输出到不同的分支光纤137,并进一步通过所述第二级分光器132-1〜132-4输出给不同组的光网络单元。 Based on the above transmissive film, the first stage beam splitter 131 can be realized to the downlink data from the plurality of different wavelengths of the wavelength of the downstream signal 110 in the optical line terminal carried in different branches are output to the optical fiber 137, and further through the said second stage splitter 132-1~132-4 outputted to the optical network units of different groups.

[0031] 具体地,在下行方向,所述光线路终端110输出的多波长下行信号经过所述下行主干光纤136传输之后,被所述主干稱合器135稱合到所述第一级分光器131,所述第一级分光器131对所述多波长下行信号进行功率分光形成多个多波长下行信号之后,分别通过其下行分支端口输出给所述多个下行分支光纤。 After [0031] Specifically, in the downlink direction, the downlink multi-wavelength signal 110 output from the optical line terminal through the downlink transmission trunk fiber 136, is called the trunk, said coupler 135 is bonded to the first stage beam splitter 131, the first stage beam splitter 131 the down-signals after the multi-wavelength spectral power of downlink signal forming a plurality of multi-wavelength, respectively, through which the downstream branch port to the plurality of downlink branch output optical fibers. 由于所述第一级分光器131的下行分支端口分别镀有不同透射谱的透射膜,因此,在所述多波长下行信号穿过所述第一级分光器131的下行分支端口时,只有其中一个波长的光信号可以通过,而其他波长的光信号则被滤除。 Since the first stage splitter downstream branch port 131 are coated with different transmission spectra of the transmissive film, and therefore, when a downlink signal through the multi-wavelength splitter downstream of the first stage of the branch port 131, which is only optical signal by a wavelength, and the optical signals of other wavelengths were filtered off.

[0032] 比如,所述第一级分光器131的第一个下行分支端口输出的光信号为具有所述第一下行波长λ dl的下行数据,即所述光发射器Txl发射的下行数据;所述第一级分光器131的第二个下行分支端口输出的光信号为具有所述第二下行波长Xd2的下行数据,即所述光发射器Τχ2发射的下行数据;所述第一级分光器131的第三个下行分支端口输出的光信号为具有所述第三下行波长λ d3的下行数据,即所述光发射器Tx3发射的下行数据;而所述第一级分光器131的第四个下行分支端口输出的光信号为具有所述第四下行波长λ d4的下行数据,即所述光发射器Tx4发射的下行数据。 Optical signal [0032] For example, the first stage a first splitter output port 131 downstream of the branch having the first wavelength λ dl downlink downlink data, i.e. downlink data transmitted light emitter Txl ; a second branch port downstream optical signals output from the first stage beam splitter 131 having a downlink data of the second downlink Xd2 wavelength, i.e., the downlink data transmitted light emitter Τχ2; the first stage the third optical signal splitter downstream branch port 131 is output from the downlink data having the third wavelength λ d3 downlink, i.e. downlink data transmitted light emitter Tx3; and the first-stage beam splitter 131 the fourth branch port downlink optical signal output having the downlink wavelength λ fourth data d4 is downlink, the downlink data transmitter Tx4 i.e. the emitted light.

[0033] 因此,通过各个下行分支光纤137传输到所述第二级分光器132-1〜132_4的光信号分别为所述光发射器Txl〜Τχ4的发射的下行数据,所述下行数据经过所述第二级分光器132-1〜132-4进行功率分光之后,进一步通过所述分布光纤138传输到对应组的光网络单元。 Downlink data [0033] Thus, each downlink transmission branch optical fiber 137 to the optical signal through the second stage beam splitter 132-1~132_4 respectively emitting the light emitter is Txl~Τχ4 of the downlink data via the after said second stage splitter 132-1~132-4 performs power splitting, a distribution fiber 138 is further transmitted to the optical network unit corresponding to the group.

[0034] 而在上行方面,每一组的光网路单元分别采用其上行波长Aul〜AU4并在所述光线路终端110授权的时隙发送上行数据,由于各组光网络单元分别采用不同的上行波长,因此同一个时隙可以有多个采用不同上行波长的光网络单元同时发送上行数据。 [0034] In the upside, the optical network units which each group respectively upstream wavelength Aul~AU4 and transmits uplink data 110 in the optical line terminal authorization time slot, since each group of optical network units are different upstream wavelength, the same slot may have a plurality of different wavelengths of the upstream optical network unit simultaneously transmits the uplink data. 所述不同组的光网络单元发送的不同波长的上行数据分别通过其对应的第二级分光器132-1〜132-4汇聚之后,被不同的分支耦合器134-1〜134-4耦合到所述第一级分光器131的不同上行分支端口。 Different wavelengths of the uplink data sent by an optical network unit, respectively after passing through different groups of the corresponding second optical splitter stage 132-1~132-4 aggregation, different branches are coupled to the coupler 134-1~134-4 the first stage beam splitter 131 is different from the uplink branch ports. 所述第一级分光器131进一步对所述不同波长的上行数据进行复用形成多波长上行信号之后,通过所述上行主干光纤135传输到所述光线路终端110。 After the first stage beam splitter 131 is further of the uplink data with different wavelengths forming a multi-wavelength multiplexed uplink signal by transmitting the uplink trunk fiber 135 to the optical line terminal 110.

[0035] 本发明提供的多波长无源光网络系统100由于所述光网络单元120-1〜120_n分成多组并且各组分别采用不同的工作波长,因此,对于某个光网络单元而言,其并不知道自己需要工作在哪个上下行波长。 [0035] The multi-wavelength passive optical network system according to the present invention provides the optical network unit 100 due 120-1~120_n divided into groups and each group using a different operating wavelength, therefore, for an optical network unit, it does not know what they need to work up and down the line wavelength. 为实现负载均衡并避免出现波长冲突,所述光线路终端110需要指定向光网络单元指定工作波长,即将波长指示信息传递给所述光网络单元。 To achieve load balancing and to avoid wavelength conflicts, the optical line terminal 110 to specify the designated optical network unit operating wavelength, i.e. the wavelength indication information is transmitted to the optical network unit.

[0036] 在所述多波长无源光网络系统100中,虽然不同组光网络单元采用波分复用的方式进行工作,但所述光线路终端110和每一组光网络单元之间可以依据XGPON协议进行通信,具体协议内容可以参照ITU-T G.987系列标准。 [0036] In the multi-wavelength passive optical network system 100, although different sets of optical network units operate using wavelength division multiplexing manner, but between the optical line terminal 110 and optical network unit based on each set of XGPON communication protocol, the specific content may refer to protocol ITU-T G.987 series standards. [0037] 在一种实施例中,所述光线路终端110可以将所述波长信息承载在下行XGTC(XG-P0N Transmission Convergence, XGPON 传输汇聚)巾贞,并通过所述下行XGTC 中贞将所述波长指示信息提供给所述光网络单元。 [0037] In one embodiment, the optical line terminal 110 may be on the wavelength information carried in the downlink XGTC (XG-P0N Transmission Convergence, XGPON transmission convergence) towel Zhen, and by Chen in the downlink XGTC The said indication information is provided to the wavelength of the optical network unit. 请参阅图2,其为本发明提供的多波长无源光网络系统100可以采用的下行XGTC帧的一种实施例的帧结构示意图。 Referring to FIG schematic structural frame 2. A downlink frame XGTC multi-wavelength passive optical network system 100 in which the present invention may be employed to provide an embodiment. 所述下行XGTC帧可以包括XGTC帧头和XGTC净荷。 The frame may comprise a downlink XGTC XGTC XGTC header and a payload. 其中,所述XGTC帧头可以定义有波长指示域。 Wherein the XGTC header indication field can be defined wavelength. 具体地,所述XGTC巾贞头可以包括波长指示域、HLend域、带宽地图(Bandwidth map, Bffmap)域和下行物理层操作管理维护(Physical Layer Operations, Administration and Maintenancedownstream, PLOAMd)域。 In particular, the head may comprise XGTC napkin Chen wavelength indication field, HLend domain, BWMap (Bandwidth map, Bffmap) domain and a downlink physical layer operation management and maintenance (Physical Layer Operations, Administration and Maintenancedownstream, PLOAMd) field. 其中,所述Hlend域可以包括带宽地图长度(BWmap Length)、PLOAM 计数(PL0AM count)和混合纠错(Hybrid Error Correction, HEC)。 Wherein, the domain may include Hlend BWMap length (BWmap Length), PLOAM count (PL0AM count) and mixed Correction (Hybrid Error Correction, HEC). 所述波长指不域用来承载所述波长指示信息,在具体实施例中,所述波长指示信息可以为波长编号。 Means not the wavelength region of the wavelength for carrying indication information, in particular embodiments, the indication information may be a wavelength in the wavelength number.

[0038] 本发明提供的多波长无源光网络系统100将所述光网络单元120-1〜120_n分成多组,并且在所述第一级分光器131的下行分支端口采用镀膜方式实现下行波长分离,并通过所述第一级分光器131实现上行波长复用,从而实现分别采用多对上下行波长来分别承载不同组的光网络单元的上下行数据,由此,在同一时间段便可以利用不同波长同时传输多个光网络单元的数据,从而有效提升系统的整体带宽,满足用户的宽带业务对带宽的增长需求。 [0038] The multi-wavelength passive optical network system according to the present invention provides the optical network unit 100 120-1~120_n divided into multiple groups, and a downlink branch port 131 using a plating manner downstream wavelength splitter in the first stage separated, and 131 to achieve uplink wavelength multiplexed by the first optical splitter stage, respectively, in order to achieve multi-wavelength uplink and downlink, respectively uplink data carrying optical network units of different groups, whereby, at the same time can using different wavelengths for simultaneous transmission of data of a plurality of optical network units, thereby effectively improve the overall bandwidth of the system to meet the user demand for broadband bandwidth growth.

[0039] 以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书内容所作的等效结构或等效流程变换,或直接或间接运用在其它相关的技术领域,均同理包括在本发明的专利保护范围内。 [0039] Other related art described above are only embodiments of the present invention, not intended to limit the scope of the present invention, the present invention is usually made by using a description equivalent structures or equivalent process, or applied directly or indirectly art shall fall within the scope of protection of the present invention.

Claims (7)

  1. 1.一种多波长无源光网络系统,其特征在于,包括光线路终端、光分配网络和多个光网络单元,所述光线路终端通过所述光分配网络以点到多点的方式连接到所述光网络单元;其中,所述多个光网络单元分成多组,每一组光网络单元分别采用不同的上下行波长,所述光分配网络包括第一级分光器和多个第二级分光器,其中所述第一级分光器包括上行公共端口、下行公共端口、多个上行分支端口和多个下行分支端口,其中所述上行公共端口和下行公共端口分别通过上行主干光纤和下行主干光纤连接到所述光线路终端,且所述第一级分光器的下行分支端口和上行分支端口分别连接下行分支光纤和上行分支光纤,并通过其中一个第二级分光器连接到一组光网络单元,所述第一级分光器的下行分支端口分别镀有透射膜,且不同透射膜具有不同的透射谱;其 1. A multi-wavelength passive optical network system, comprising an optical line terminal, an optical distribution network and a plurality of optical network units, the optical line terminal by the optical distribution network in a multipoint connected to the optical network unit; wherein the plurality of optical network units into a plurality of groups, each of the optical network units using different wavelengths of the upper and lower rows, the optical distribution network comprising a first stage splitter and a plurality of second beam splitter stage, wherein the first optical splitter stage including an uplink common port, a downlink common port, a plurality of upstream ports and a plurality of downstream branches branch ports, wherein the uplink and downlink common port through a common port, respectively upstream and downstream optical fiber trunk trunk optical fiber connected to the optical line terminal, the downlink and uplink branch ports and branch ports of the first stage are connected to the optical splitter branch fiber downlink and uplink branch fiber, and a second stage splitter connected to a set of light therethrough network unit downlink branch port of the first stage beam splitter transmissive film are respectively coated with, and distinct from the transmission of films having different transmission spectra; the ,所述光线路终端向所述光网络发送的下行XGTC帧的帧头包括波长指示域,所述波长指示域用于承载波长指示信息。 , The downlink frame header XGTC transmitting the optical line terminal to the optical network comprises a wavelength indication field, the wavelength indication field for carrying information indicative of the wavelength.
  2. 2.根据权利要求1所述的多波长无源光网络系统,其特征在于,所述多个光网络单元分成四组,且所述第一级分光器包括四个下行分支端口,每个下行分支端口分别对应于其中一组光网络单元,所述四个分支端口分别镀有第一透射膜、第二透射膜、第三透射膜和第四透射膜。 The multi-wavelength passive optical network system according to claim 1, wherein the plurality of optical network units divided into four groups, and the first beam splitter comprises a four stage branch downstream ports, each downstream wherein the branch port respectively corresponding to a set of optical network units, the four port branch transmissive film are respectively coated with a first, a second transmissive film, a transmissive film third and a fourth transmissive film.
  3. 3.根据权利要求2所述的多波长无源光网络系统,其特征在于,所述第一透射膜的中心透射波长为第一组光网络单元的下行波长,所述第二透射膜的中心透射波长为第二组光网络单元的下行波长,所述第三透射膜的中心透射波长为第三组光网络单元的下行波长,所述第四透射膜的中心透射波长为第四组光网络单元的下行波长。 The multi-wavelength passive optical network system according to claim 2, wherein the center transmission wavelength of the first transmission film into a first group of downlink wavelength optical network unit, the center of the second transmission film a second transmission wavelength set to a wavelength of the downstream optical network units, the third transmission film center transmission wavelength of the wavelength of the third set of downstream optical network units, the fourth transmission film center transmission wavelength of the fourth set of optical network downstream wavelength units.
  4. 4.根据权利要求2所述的多波长无源光网络系统,其特征在于,所述第一级分光器还包括四个上行分支端口,所述四个分支端口分别连接有上行分支光纤,并分别通过分支耦合器耦合到其对应的下行分支光纤。 The multi-wavelength passive optical network system according to claim 2, wherein said first stage further comprises four uplink beam splitter branch ports, the branch ports are connected to the four branch optical fiber uplink, and It is coupled to corresponding downlink branch fibers through the branch coupler.
  5. 5.根据权利要求4所述的多波长无源光网络系统,其特征在于,所述四个上行分支端口的通道波长分别为所述第一组光网络单元的上行波长、所述第二组光网络单元的上行波长、所述第三组光网络单元的上行波长和所述第四组光网络单元的上行波长。 The multi-wavelength passive optical network system according to claim 4, wherein said four upstream branch port channel wavelengths of said first set of uplink wavelength optical network unit, the second set upstream wavelength optical network unit, the third set of upstream wavelength optical network unit of the upstream wavelength and the fourth set of optical network units.
  6. 6.根据权利要求1所述的多波长无源光网络系统,其特征在于,所述光线路终端包括多个光发射器,其中每个光发射器的发射波长分别其中一组光网络单元的下行波长。 The multi-wavelength passive optical network system according to claim 1, wherein the optical line terminal comprises a plurality of light emitters, wherein each light emitter wherein the emission wavelengths of a set of optical network units downstream wavelength.
  7. 7.根据权利要求6所述的多波长无源光网络系统,其特征在于,所述光线路终端还包括多个光接收器,其中每个光接收器的接收波长分别其中一组光网络单元的上行波长。 The multi-wavelength passive optical network system according to claim 6, wherein the optical line terminal further includes a plurality of optical receivers, wherein each light receiver receives a set of wavelengths of the optical network unit wherein uplink wavelength.
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