ROADM技术的应用

[摘要] 对可重构光分插入复用器（ROADM）设备在中国运营商网络中的应用提出组网方案：在城域/本地传送网中，ROADM采用层次化组网，提高设备方向数和CDC（波长无关、方向无关、竞争无关）能力，通过汇聚层设备分摊压力的方式减轻对核心层设备的维度要求；在骨干传送网中，ROADM设备组网根据情况，可采用局部ROADM子网与点到点波分复用（WDM）系统相结合、区域ROADM子网、全网ROADM组网等3种组网结构，为客户直接提供灵活的波道出租业务，为IP网波道提供灵活、低成本的动态恢复能力，在故障条件下为维护部门提供灵活的波道调度能力。

[关键词] 波分复用；可重构光复用器；光复用器；光交叉连接；波长选择光开关；光传送网

[Abstract] In this paper, we suggest some applications of reconfigurable optical add-drop multiplexer (ROADM) in China. In metro/local ROADM networks, hierarchical networking can be used to increase the number of devices and improve CDC capacity. Requirements on core-layer devices can be reduced through pressure allocation by convergence layer. Three application scenarios are proposed for backbone ROADM networks: 1) combining fragmented ROADM sub-networks and point-to-point wavelength division multiplexing (WDM) transmission systems; 2) ROADM sub-networks for each area, and 3) unified ROADM network for the whole network. With ROADM, operators can provide flexible wavelength leasing; dynamic, low-cost restoration capacity for wavelength paths carrying IP circuits; and quick wavelength path reconstruction when there are failures.

[Keywords] wavelength division multiplexing; reconfigurable optical add-drop multiplexer; optical add-drop multiplexer; optical cross-connect; wavelength selective switch; optical transport networks