WO2008028362A1 - Dispositif à multiplexeur optique à insertion/extraction configurable pour la réalisation d'une distribution de longueur d'onde monodirectionnelle et polydirectionnelle - Google Patents

Dispositif à multiplexeur optique à insertion/extraction configurable pour la réalisation d'une distribution de longueur d'onde monodirectionnelle et polydirectionnelle Download PDF

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WO2008028362A1
WO2008028362A1 PCT/CN2006/003748 CN2006003748W WO2008028362A1 WO 2008028362 A1 WO2008028362 A1 WO 2008028362A1 CN 2006003748 W CN2006003748 W CN 2006003748W WO 2008028362 A1 WO2008028362 A1 WO 2008028362A1
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wavelength
unit
directional
optical
function
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French (fr)
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Xiaoqiang Wei
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ZTE Corp
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ZTE Corp
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    • 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
    • H04Q11/0005—Switch and router aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
    • H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0204—Broadcast and select arrangements, e.g. with an optical splitter at the input before adding or dropping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0209—Multi-stage arrangements, e.g. by cascading multiplexers or demultiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0213—Groups of channels or wave bands arrangements
    • 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
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0016—Construction using wavelength multiplexing or demultiplexing

Definitions

  • the present invention relates to the field of optical transmission system DWDM (Dense Wavelength Division Multiplexing), in particular to realize single- and multi-directional wavelengths.
  • DWDM Density Division Multiplexing
  • a scheduled ROADM (Reconfiguration Optical Add-Drop Multiplexer) device BACKGROUND
  • DWDM devices have been widely used in the construction of transmission networks at various levels, from backbone networks to local and metro core networks.
  • the DWDM device networking also transitions from the point-to-point topology of the single ticket to the topology of the ring network, the intersection of the two rings and the complex grid network, and will eventually be applied to the topology of the mesh network.
  • the service type is transitioned from circuit-switched services based on TDM (Time Division Multiplexing) services to IP-based data services.
  • TDM Time Division Multiplexing
  • IP-based data services IP-based data services.
  • the rapid growth of data services puts higher demands on the network topology and the functions of the equipment. Due to the uncertainty of business development and the difficulty of estimating the previous period, the equipment is required to provide more intelligent functions in order to facilitate the network topology.
  • the scheduling function of the service can be quickly and flexibly implemented to adapt to changes in networking and service distribution. Similar to SDH (Synchronous Digital Hierarchy) devices, VC4 switching and scheduling are similar.
  • the intelligentization of the network requires DWDM devices to provide wavelength-based configurable functions, that is, wavelength-configurable ROADMs, which can flexibly implement wavelengths.
  • the add/drop multiplexing function can be configured remotely.
  • ROADM can connect any point to any point without manual deployment, and can also implement single-wavelength up-and-down and straight-through configuration.
  • ROADM technology can increase the flexibility of WDM (Wavelength Division Multiplexing) network, enabling operators to remotely Dynamically controlling the path of wavelength transmission can effectively reduce the operator's operation and maintenance costs.
  • WDM Widelength Division Multiplexing
  • the existing ROADM functions are implemented in a variety of technologies, including MEMS (Micro Electro Mechanical System) based on optical switch arrays and current implementations based on new optical devices.
  • the new optical devices are mainly based on WB (Wavelength Blocker, Optical Wavelength Blocking Device).
  • WB Wideband Blocker, Optical Wavelength Blocking Device
  • Figure 1 and Figure 2 show the block diagram of the unidirectional and multi-directional ROADM functions using an optical switch array, which uses the Demux/Switch/Mux technology to achieve wavelength configurability.
  • the wavelength scheduling optical switch can be composed of two 1 x 2 or one 2 x 2 switches in the unidirectional ROADM function.
  • the upper/lower way optical switch provides the versatility of the upper and lower wavelength ports. Port assignment function.
  • FIG. 3 is a functional block diagram of the ROADM implemented by WB.
  • the lower channel is selected by the coupler and the tunable filter by means of broadcast selection.
  • the wavelength selection is performed by the lower channel and the port assignment.
  • the straight-through port is blocked to realize the function of the wavelength on the road.
  • the structure is simple and flexible, and the single-direction service can be selected to perform the downlink and broadcast functions.
  • the scheme only implements the one-way wavelength blocking function, and the downstream wavelength can be selected by the single-channel adjustable i-filter.
  • the ROADM function in multiple directions is realized, that is, the scheduling function of wavelengths in different directions when implementing multiple directions.
  • An object of the present invention is to provide a ROADM device that implements single- and multi-directional wavelength scheduling.
  • the WB implements a technique in which a single-directional mode cannot be smoothly extended and a configurable add-drop multiplexing function that does not support multiple optical directions is implemented.
  • WSS Widelength Selective Switch
  • the device provides flexible wavelength configurable up and down functions. It supports the scheduling of the same wavelength between multiple directions, and can realize the broadcast function of the wavelength 7
  • a ROADM device for implementing single- and multi-directional wavelength scheduling, which is characterized in that it comprises N sets of optical preamplifier units, coupler units, transmitting WSS and optical power amplifying unit, N is a natural number greater than or equal to 1, representing N directions; the device also has a downlink WSS and distribution unit, a tunable filtering and receiving unit RX, a tunable uplink TX and an on-channel combining and distributing unit; wherein: the optical front The amplifying unit is input to the combiner unit after amplifying the input optical signal; The coupler unit realizes a broadcast function for receiving wavelengths, which can expand the local downlink and broadcast to other directions or upgrade ports; the downlink WSS and the distribution unit realize the wavelength selection of the local downlink and other downlink broadcast inputs.
  • the power distribution is allocated to each tunable filtering and receiving unit RX; the tunable filtering and receiving unit RX implements wavelength selection of the downlink signal and reception of the bearer service; the tunable uplink TX implements the wavelength tunable function and service of the uplink service Sending and transmitting to the uplink multiplexing and distribution unit; the uplink multiplexing and distributing unit realizes the combining and broadcasting function of the uplink service, and the combined signal is output to the WSS and widened to other directions or upgraded ports; the WSS implements the direction in the direction The selection of the wavelength, which selects the corresponding wavelength multiplexed wave from the upper wavelengths from different directions and outputs to the optical power amplifying unit; the optical power amplifying unit amplifies the output of the optical signal from the WSS.
  • the device When N is 1, the device It is a ROADM device with one-way wavelength scheduling. When N is 2, the device is a ROADM device with bidirectional wavelength scheduling. The number of wavelengths in the node is increased by adding a tunable filter and a service board. The device smoothly upgrades the 1-32 wave system in the node by adding a tunable filter and a service board. The device is upgraded through the coupler. The cascading with the WSS enables the node network element to expand in multiple directions. With the above technical features, the technical effect of the device of the present invention is: Compared with the prior art, since the device of the present invention is a ROADM device composed of WSS, It can achieve a variety of functions as follows:
  • the device of the invention supports single and multi-directional flexible expansion and smooth upgrade function
  • the device of the invention has multi-directional wavelength up-and-down configuration and scheduling function; Scheduling crossover function for arbitrary wavelengths in 4 directions and local upstream and downstream wavelengths;
  • the device of the present invention supports the broadcast function and the wavelength loopback function of the wavelength bearer service
  • FIG. 1 is a schematic block diagram of a single-directional ROADM function using an optical switch array in the prior art.
  • 2 is a schematic block diagram of a multi-directional ROADM function implemented by using an optical switch array in the prior art.
  • FIG. 3 is a schematic block diagram of a ROADM function implemented by WB in the prior art.
  • Figure 4 is a block diagram showing the principle of Embodiment 1 of the apparatus of the present invention.
  • FIG. 4 is a schematic block diagram of Embodiment 1 of a ROADM device for implementing single- and multi-directional wavelength scheduling according to the present invention.
  • This example is a directional-wavelength scheduled ROADM device, and a cascade port between multiple directions is given.
  • the device mainly comprises an OPA (optical preamplifier unit) 31, a coupler unit 32, a transmitting WSS 37 and an optical power amplifying unit 38.
  • OPA optical preamplifier unit
  • the device further has a downlink WSS and a distribution unit 33, a tunable filtering and receiving unit RX 34, The tunable add-on TX 35 and the add-on multiplexer and distribution unit 36 are tunable.
  • the OPA 31 is input to the coupler unit 32 after amplifying the input optical signal;
  • the downlink WSS 33 and the distribution unit realize the wavelength selection of the local downlink and other downlink broadcast inputs and perform power allocation 301 30i... 30 ⁇ , which are allocated to each tunable filtering and receiving unit RX
  • the tunable filtering and receiving unit RX 34 realizes wavelength selection of the downlink signal and reception of the bearer service;
  • the tunable uplink TX 35 realizes the wavelength tunable function of the uplink service and the service transmission 401-add... 40n-add, supper ⁇ > Wave H ⁇ unit 36;
  • the multiplexer and distribution unit 36 realizes the merging and broadcasting function of the on-road service, and the multiplexed signal is output to the WSS 37 and widely inserted into other directions or the upgrade port 401 -out...
  • the WSS 37 realizes the selection of the wavelength of the uplink in the direction, and selects the corresponding wavelength multiplexed from the upper wavelengths 501...50i...50n from different directions and outputs to the optical power amplifying unit 38; the optical power amplifying unit 38 pairs The amplified output of the WSS 37 optical signal.
  • the expansion and upgrade of the device involves two aspects, one is the increase of the number of wavelengths in the node, and the other is the expansion of the node network element in multiple directions; for the former, the tunable filter and the service board can be directly implemented, and the support is provided. Smooth upgrade of 1 - 32 wave system; for the latter, it is realized by coupler upgrade port and WSS cascade.
  • FIG. 5 again, it is a schematic block diagram of Embodiment 2 of the present invention. As shown in the figure: This device is used to implement the dual-directional ROADM function. It mainly includes: ⁇ Lower part:
  • A, B send WSS 47A, 47B; A, B to OBA 48A, 48B.
  • the device can implement wavelength configurable up and down functions, wavelength scheduling and loopback functions, wavelength broadcast functions and route protection functions.
  • the node is ⁇ ⁇ wavelength (with protection), ⁇ 2 wavelength is wide and wide (with protection), ⁇ 3 wavelength is straight through; local ⁇ 1 wavelength is applied and the wavelength is implemented Route protection, sending and receiving from the forward direction is the working route, and sending and receiving from the B direction is the protection route.
  • the configurable up and down and wavelength broadcast functions are implemented by the apparatus of Embodiment 2:
  • the configurable up and down and wavelength broadcast functions of the wavelength are described as follows:
  • a direction input multiplexed light is amplified by the OPA 41A, and the 1:8 coupler unit 42A
  • the power distribution of the receiving multiplexed wavelength in the direction is realized, and the output can be connected to the local downlink and other directions of the uplink input;
  • the node WSS 43 is selected from the Aout3 (working routing direction) to select the ⁇ 1 wavelength, and the ⁇ 2 wavelength is used.
  • the power is divided by the 1:32 coupler unit 43 and then passed through the local adjustable i-rate filter 44 to select the next way.
  • the WSS 47B selects the ⁇ 2 wavelength in the direction and the through ⁇ 3 wavelength multiplexes after 48 ⁇ output, for the through port Aout2
  • the ⁇ ⁇ wavelength is blocked, the configurable upper and lower wavelengths of the wavelength and the wide wavelength function are realized, and the function of the other direction is realized by the same reason.
  • the wavelength modulation between the ⁇ and ⁇ directions and the wavelength loopback function are realized by the apparatus of the second embodiment: the multi-directional wavelength scheduling and the wavelength loopback function are described as follows:
  • the received signals in the ⁇ and ⁇ directions are respectively coupled through 1:8 42 ⁇ , 42 ⁇ power distribution, the optical signal received in the direction is widely squeezed to other directions for the downlink and the uplink input port;
  • ⁇ direction of the transmission WSS 47 ⁇ select the directional output from the input multiplexed signals from different directions
  • the corresponding wavelength in this example, selects the upper wavelength ⁇ ⁇ from Badd3, selects the through wavelengths ⁇ 2 and ⁇ 3 from Badd2, and amplifies the output after merging.
  • the downlink WSS 43 selects a specific wavelength multiplexed and downlinked channel in the corresponding direction from the broadcast services input from multiple ports, in this example, ⁇ 1 and ⁇ are selected from Aout3 (working route reception) or Bout3 (protection route reception). 2 down the road, prohibit ⁇ 3 in Aout3 or Bout3.
  • Wavelength scheduling in multiple directions can be achieved by sending WSS units and downlink WSS on the road.
  • For the wavelength loopback function if ⁇ 1, ⁇ 2, and ⁇ 3 are selected from Aaddl by the WSS 47A, a loopback function of 3 wavelengths is implemented in the ⁇ direction.
  • the local loopback function can be implemented by selecting the corresponding wavelength of the local uplink broadcast by the downstream wavelength selection unit, but the local loopback function has little practical significance.
  • the wavelength protection function is implemented by the device of Embodiment 2:
  • the wavelength protection function of the wavelength is described as follows: On the upper end, ⁇ 1 passes the uplink multiplexing and power allocation.
  • the unit 46 has a wide output, and the WSS 47A is sent from A to the ⁇ 1 wavelength output from Aadd3. This path is the working route, and the WSS 47 is transmitted from the ⁇ to the ⁇ 1 wavelength output from the Badd3. This path is the protection route.
  • Concurrency function for service wavelength (protection route can also not select ⁇ 1 for simultaneous output, so that it can carry additional services);
  • WSS 43 selects the status of the work route and protection route from Aout3.

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  • Computer Networks & Wireless Communication (AREA)
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Description

实现单、 多方向波长调度的可配置光分插复用装置 技术领域 本发明涉及光传输系统 DWDM ( Dense Wavelength Division Multiplexing, 密集波分复用技术） 领域， 特别是一种实现单、 多方向波长调度的 ROADM ( Reconfiguration Optical Add-Drop Multiplexer光分 复用 ) 装置。 背景技术 目前， DWDM设备已经广泛应用于各级传输网络的建设， 从骨干网絡到 本地及城域核心网络。 DWDM 设备组网也从筒单的点对点拓朴过渡到环网拓 朴， 两环相交拓朴以及复杂的格形組网， 并最终将应用于网状网拓朴。 业务类 型由以 TDM ( Time Division Multiplexing, 时分多路复用） 业务为主的电路交 换业务过渡到以 IP为主的数据业务。数据业务的快速增长对网络拓朴以及设备 的功能提出了更高的要求； 由于业务发展的不确定性及前期预估难度的增加， 要求设备提供更多的智能化功能， 以便在网络拓朴发生改变以及业务分布发生 变化时能够快速灵活实现业务的调度功能以适应组网及业务分布的变化。 同 SDH ( Synchronous Digital Hierarchy , 同步数字系列）设备实现对 VC-4 交换和调度类似，网络的智能化要求 DWDM设备提供基于波长的可配置功能， 即波长可配置的 ROADM, 可以灵活的实现波长的分插复用功能并可以进行远 程配置。 ROADM可以在无须人工调配的情况下实现任意点对任意点的连接， 也可以实现单波长的上下路及直通配置， ROADM技术可以增加 WDM (波分 复用技术） 网络的弹性， 使运营商远程动态控制波长传输的路径， 可有效地减 少运营商的运营和维护成本。 同时随着网络规模的发展以及业务类型的多样 性， 要求能够提供多方向、 可实现业务广播功能的智能化 ROADM系统。 现有 ROADM功能的实现有多种技术， 它包括基于光开关阵列的 MEMS ( Micro Electro Mechanical System, 4敖电子机械系统 ) 传统技术和目前基于新 型光器件的实现技术， 该新型光器件主要是基于 WB ( Wavelength Blocker, 光 波长阻断器件）。 下面筒要说明几种方案的原理： 图 1和图 2分别为采用光开关阵列实现单方向和多方向 ROADM功能的 原理框图， 它通过采用 Demux/Switch/Mux技术实现波长的可配置上下。 如图 1 所示， 在单方向 ROADM功能 4医图图中波长调度光开关可由 2个 1 x 2或 1 个 2 x 2开关组成， 上 /下路指配光开关提供上下波长端口的通用性， 实现端口 指配功能。 如果对于一个 32 波系统要求实现可配置上下， 则需要 32个 2 x 2 光开关组成的阵列， 同时需要 2个 32 X 32规模的光开关实现端口指配， 支持 更大容量系统时， 需要的光开关规模更大。 如图 2所示， 在多方向 ROADM功 能框图中， 按照 4个方向考虑需要 32个 8 X 8光开关实现可配置上下及同波长 多方向间波长调度功能， 需要 2个 128 X 128光开关实现端口指配功能， 这样 的光开关规模是无法实现的。 而且光开关充法进行平滑扩展， 成本将是天文数 字， 也正因为如此， 以及光开关的可靠性等原因， 目前光开关的方案无法实现 商用 4匕。 图 3为采用 WB实现的 ROADM功能框图， 下路通过耦合器和可调谐滤 波器釆用广播选取的方式实现波长的选择下路和端口指配， 通过波长阻断器件 对需要本地上路的波长在直通口予以阻断， 实现波长的上路功能。 结构简单灵 活， 可实现单方向业务的选择下路和广播功能， 但该方案只实现单向的波长阻 断功能， 同时下路波长通过单路的可调 i皆滤波器实现选择下路， 无法实现多个 方向 ROADM功能， 即实现多个方向时不同方向间的波长的调度功能。 发明内容 本发明的目的在于提供一种实现单、 多方向波长调度的 ROADM装置， 现有技术中 WB实现单方向方式无法平滑扩展和不支持多个光方向的可配置分 插复用功能的技术问题， 以及采用光开关阵列实现多方向方式成本高的技术问 题， 它采用 WSS ( Wavelength Selective Switch, 光波长选择器件） 实现单方向 以及多方向的 ROADM功能， 该装置提供灵活的波长可配置上下功能， 支持多 方向之间同波长的调度， 并可以实现波长 7|载业务的广播功能。 为实现上述目的， 本发明的技术方案是： —种实现单、 多方向波长调度的 ROADM装置， 其特征是它包括 N組光 前置放大单元、 耦合器单元、 发送 WSS和光功率放大单元， 该 N为大于等于 1 的自然数， 代表 N个方向； 该装置中还具有下路 WSS及分配单元、 可调谐 滤波及接收单元 RX、 可调谐上路 TX和上路合波及分配单元； 其中： 该光前置放大单元在对输入光信号放大后输入 合器单元； 该耦合器单元实现对接收波长的广播功能 ,它可扩展本地下路并广播至其 它方向或升级口； 该下路 WSS及分配单元实现对本地下路及其它下路广播输入的波长选择 并进 4于功率分配， 分配至各可调谐滤波及接收单元 RX; 该可调谐滤波及接收单元 RX 实现下路信号的波长选择及承载业务的接 收； 该可调谐上路 TX实现上路业务的波长可调谐功能及业务发送，发送至上 路合波及分配单元； 该上路合波及分配单元实现上路业务的合波及广播功能，合波后的信号输 出至 WSS并广 #"至其它方向或升级口； 该 WSS实现对本方向上路波长的选择， 它从来自不同方向的上路波长中 选择相应波长合波后输出到光功率放大单元； 该光功率放大单元对来自 WSS的光信号的放大后输出。 当 N为 1时， 本装置是单方向波长调度的 ROADM装置。 当 N为 2时， 本装置是双方向波长调度的 ROADM装置。 该装置通过增加可调谐滤波器及业务单板使节点内波长数量的增加。 该装置通过增加可调谐滤波器及业务单板实现节点内 1 - 32 波系统的平 滑升级。 该装置通过耦合器升级口和 WSS级联使节点网元实现多个方向的扩展。 藉由上述技术特征， 本发明装置所具有的技术效果是： 与现有技术相比， 由于本发明装置是采用 WSS組成的 ROADM装置， 它 可以实现如下的多种功能：
( 1 ) 本发明装置支持单、 多方向灵活扩展， 平滑升级功能；
( 2 ) 本发明装置具有多方向的波长上下路配置及调度功能； 可支持大于 4个方向的任意波长及本地上下路波长的调度交叉功能；
( 3 ) 本发明装置支持波长承载业务的广播功能和波长环回功能；
( 4 ) 本发明装置支持波长的路由保护功能； 因此， 本发明达到了智能化 DWDM设备的波长调度要求， 并支持平滑扩 展和灵活升级的功能， 节省了初期投资。 附图说明 图 1是现有技术中采用光开关阵列实现单方向 ROADM功能的原理框图。 图 2是现有技术中采用光开关阵列实现多方向 ROADM功能的原理框图。 图 3是现有技术中采用 WB实现的 ROADM功能的原理框图。 图 4是本发明装置实施例 1的原理框图。 图 5是本发明装置实施例 2的原理框图。 具体实施方式 请参阅图 4, 它是本发明实现单、 多方向波长调度的 ROADM装置实施例 1 的原理框图。 如图所示： 该例是单方向波长调度的 ROADM装置， 并给出了 多方向间的级联端口。 该装置主要包括 OPA (光前置放大单元） 31、 耦合器单 元 32、 发送 WSS 37和光功率放大单元 38 , 该装置中还具有下路 WSS及分配 单元 33、 可调谐滤波及接收单元 RX 34、 可调谐上路 TX 35和上路合波及分配 单元 36。 其中： 该 OPA 31在对输入光信号放大后输入耦合器单元 32; 该耦合器单元 32实现对接收波长的广播功能， 它可扩展本地下路 201并 广插 ^ "至其它方向或升级口 202…… 20η; 该下路 WSS 33 及分配单元实现对本地下路及其它下路广播输入的波长 选择并进行功率分配 301 30i…… 30η ,分配至各可调谐滤波及接收单元 RX
34; 该可调谐滤波及接收单元 RX 34实现下路信号的波长选择及承载业务的 接收； 该可调谐上路 TX 35 实现上路业务的波长可调谐功能及业务发送 401 -add…… 40n-add, 至上^> 波 H酉己单元 36; 该上路合波及分配单元 36实现上路业务的合波及广播功能， 合波后的信 号输出至 WSS 37并广插至其它方向或升级口 401 -out…… 40n-out; 该 WSS 37实现对本方向上路波长的选择，它从来自不同方向的上路波长 501…… 50i…… 50η中选择相应波长合波后输出到光功率放大单元 38; 该光功率放大单元 38对来自 WSS 37的光信号的放大后输出。 该装置的扩展和升級涉及到两个方面， 一是节点内波长数量的增加， 二是 节点网元多个方向的扩展； 对于前者， 可以直接通过增加可调谐滤波器及业务 单板实现， 支持 1 - 32 波系统的平滑升级； 对于后者， 通过耦合器升级口和 WSS级联实现。 再请参阅图 5 , 它是本发明实施例 2的原理框图。 如图所示： 该装置用于 实现双方向 ROADM功能， 它主要包括: ^下部件：
Α、 Β向 OPA 41A、 41B ;
Α向和 Β向的下路 合器 42A和 42B ; 下路 WSS和功率分配单元 43， 它用于选择不同方向上的波长下路； 本框 图只画出了对异波下路的选择， 如果需要不同方向上的同波下路选择， 需要增 力口 43模块； 下路可调谐滤波器和通路接收单元 44; 本地上路可调谐发送单元 45 ; 上路合波及功率分配单元 46 ;
A、 B向发送 WSS 47A、 47B ; A、 B向 OBA 48A、 48B。 该装置可实现波长可配置上下功能、 波长调度及环回功能、 波长广播功能 及路由保护功能。 为了便于说明， 举一具体使用例： 本节点下路 λ ΐ 波长 （带 保护）， λ 2波长下路并广 · (带保护）， λ 3波长直通； 本地上路 λ 1波长并对 该波长实施路由保护， 来自 Α向的发送和接收为工作路由， 来自 B向的发送和 接收为保护路由。
( 1 ) 通过实施例 2的装置实现可配置上下及波长广播功能： 波长的可配置上下及波长广播功能描述如下： A 向输入复用光经过 OPA 41A放大输出， 由 1 : 8耦合器单元 42A首先实现该方向接收复用波长的功率 分配，输出可连接至本地下路以及其它方向的上路输入； 由本节点下路 WSS 43 从 Aout3 (工作路由方向） 中选择 λ 1波长， λ 2波长下路， 然后由 1 : 32耦合 器单元 43功率分配后经过本地可调 i皆率滤波器 44选择下路。 对于广播的 λ 2 波长以及直通 λ 3经由 Aout2直通端口输入至 B向发送 WSS 47B, 经过 WSS 47B 选择该方向上的 λ 2波长以及直通 λ 3波长复用后经过 48Β 输出， 对直通端口 Aout2 中的 λ ΐ 波长进亍阻断， 实现波长的可配置上下及波长广 功能， 另外 一个方向的功能同理实现。
( 2 ) 通过实施例 2的装置实现 Α、 Β方向间波长调度及波长环回功能： 多方向间波长调度及波长环回功能描述如下： Α、 Β方向上的接收信号分 别经过 1 : 8耦合器 42Α、 42Β 实现功率分配， 将本方向接收的光信号广擠至 其它方向供下路和上路输入端口使用； Β方向的发送 WSS 47Β从来自不同方 向上的输入合波信号中选择本方向输出的相应波长， 在本例中从 Badd3中选择 上路波长 λ ΐ , 从 Badd2中选择直通波长 λ 2和 λ 3 , 经过合波后放大输出。 下 路 WSS 43从来自多个端口输入的广播业务中选择相应方向的具体波长合波后 下路， 在本例中从 Aout3 (工作路由接收） 或者 Bout3 (保护路由接收） 中选 择 λ 1和 λ 2下路， 禁止 Aout3或者 Bout3中的 λ 3下路。 通过上路发送 WSS单 元和下路 WSS可以实现多方向上的波长调度。 对于波长环回功能， 如果 Α向发 送 WSS 47A从 Aaddl 中选择 λ 1、 λ 2和 λ 3 , 则在 Α向上实现了 3个波长的环 回功能。 同时， 通过下路波长选择单元选择本地上路的广播输出相应波长则可 以实现本地环回功能， 但本地环回功能实际应用意义不大。
( 3 ) 通过实施例 2的装置实现波长的路由保护功能： 波长的路由保护功能描述如下： 在上路端， λ 1经过上路合波及功率分配 单元 46广搐输出， 由 A向发送 WSS 47A从 Aadd3中选择 λ 1波长输出， 此路径 为工作路由， 同时由 Β向发送 WSS 47Β从 Badd3中选择 λ 1波长输出， 此路径 为保护路由， 实现对业务波长的并发功能 （保护路由也可以不选择 λ 1 同时输 出， 这样可以 ? 载额外的业务）； 在下路端， 经过本节点下路 WSS 43 艮据工作 路由和保护路由的状态选择从 Aout3中（工作路由）或者 Bout3中（保护路由） 下路 λ 1 , 实现对来自不同路由业务波长的选择接收。 综上所述仅为本发明的较佳实施例而已， 并非用来限定本发明的实施范 围。 即凡依本发明申请专利范围的内容所作的等效变化与修饰， 都应为本发明 的技术范畴。

Claims

权 利 要 求 书 一种实现单、 多方向波长调度的 ROADM装置， 其特征是它包括 N组光 前置放大单元、 耦合器单元、 发送波长选择单元和光功率放大单元， 该 N为大于等于 1的自然数， 代表 N个方向； 该装置中还具有下路波长选 择及分配单元、 可调 i皆滤波及接收单元 RX、 可调谐上路 TX和上路合波 及分配单元； 其中：
该光前置放大单元在对输入光信号放大后输入 合器单元； 该耦合器单元实现对接收波长的广播功能， 它可扩展本地下路并广 播至其它方向或升级口；
该下路波长选择及分配单元实现对本地下路及其它下路广播输入 的波长选择并进行功率分配， 分配至各可调谐滤波及接收单元 RX; 该可调谐滤波及接收单元 RX实现下路信号的波长选择及承载业务 的接收；
该可调谐上路 TX实现上路业务的波长可调谐功能及业务发送， 发 送至上路合波及分配单元；
该上路合波及分配单元实现上路业务的合波及广播功能，合波后的 信号输出至波长选择单元并广播至其它方向或升级口；
该波长选择单元实现对本方向上路波长的选择 >它从来自不同方向 的上路波长中选择相应波长合波后输出到光功率放大单元；
该光功率放大单元对来自波长选择单元的光信号的放大后输出。 根据权利要求 1所述的实现单、 多方向波长调度的 ROADM装置， 其特 征是当 N为 1时， 本装置是单方向波长调度的 ROADM装置。 根据权利要求 2所述的实现单、 多方向波长调度的 ROADM装置， 其特 征是当 N为 2时， 本装置是双方向波长调度的 ROADM装置。 根据权利要求 1或 2或 3所述的实现单、 多方向波长调度的 ROADM装 置， 其特征是通过增加可调谐滤波器及业务单板使节点内波长数量的增 加。 根据权利要求 4所述的实现单、 多方向波长调度的 ROADM装置， 其特 征是通过增加可调谐滤波器及业务单板实现节点内 1 - 32波系统的平滑 升级。
6. 根据权利要求 1所述的实现单、 多方向波长调度的 ROADM装置， 其特 征是通过耦合器升级口和波长选择单元鈒联使节点网元实现多个方向的 扩展。
PCT/CN2006/003748 2006-08-28 2006-12-30 Dispositif à multiplexeur optique à insertion/extraction configurable pour la réalisation d'une distribution de longueur d'onde monodirectionnelle et polydirectionnelle Ceased WO2008028362A1 (fr)

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