Optical brancking-complexing node device based on wavelength or waveband protection

Abstract

The device comprises two wave separators and two wave synthesizers and line protection unit. Using contained cascaded two 2x2 optical switch, the line protection unit rearranges optical signal in single wavelength or wave band. Thus, operating wavelength or wave band in fault channel of an optical fiber loop can be rearranged to preparative protection wavelength or wave band of another optical fiber loop in opposite direction; or another optical switch can be inserted between two cascaded optical switches to implement flexible local upper and lower speech functions. The invention realizes protection in granularities of wavelength or wave band for two fibers bi-directional line or two fibers one-way line using protected optical add and drop multiplexer system.

Description

technical field [0001] The present invention relates to an optical add-drop multiplexing node device based on wavelength or band protection, more specifically, the present invention relates to two-fiber bidirectional or two-fiber unidirectional optical add-drop multiplexing applicable to wavelength or band protection The node device of the ring network. Background technique [0002] The rapid development of IP and other data services has made people more and more demanding for bandwidth, and some emerging services, such as wavelength lease and optical virtual network, also require a large amount of bandwidth. All these promote the development of the backbone optical network to the direction of Tbit / s level and high performance. But in the land network of the city, there are frequent business scheduling. In order to flexibly schedule bandwidth, alleviate the node bottleneck of the backbone communication network, reduce network operating costs, and enhance the robustness of ...

AI Technical Summary

Problems solved by technology

At present, the industry already has two-fiber bidirectional line protection OADM equipment based on the multiplex section. This kind of bidirectional optical line protection belongs to shared protection. It can transmit some low-level services when the protection channel is idle, and is suitable for the services of each node on the ring network. In the case of relatively uniform traffic, the disadvantage of this protection method is that when a certain service carried by the network, such as SDH service, has excellent protection functions and does not require the protection function provided by the OADM ring network, it cannot be unprotected. resulting in unnecessary waste of resources

At present, there is no two-fiber bidirectional or unidirectional line protection OADM equipment based on wavelength and waveband. This kind of two-fiber bidirectional or unidirectional line protection OADM equipment based on wavelength and waveband can be flexibly selected. Through the two-fiber bidirectional or unidirectional line protection unit based on wavelength or waveband in the present invention, the wavelengths that do not need to be protected can use other methods, so that when a fault occurs in the line, all services will not occur Switching, but only those that need to be switched can switch the business

Images