Device, system and method for raising availability of photo-communication wavelength

Abstract

The present invention relates to a dense wavelength division multiplexing system, and discloses a device, system and method for improving the wavelength utilization rate of optical communication, so that the wavelength utilization rate of multiple nodes in the dense wavelength division multiplexing system can be improved when they communicate with each other. improved signal quality and reduced OTU count. This multi-point optical communication network includes at least 3 optical add-drop multiplexing nodes connected in series; the optical add-drop multiplexing node is used to access the business from the previous node, and drop the business destined for this node , mix the services not destined for this node with the services newly accessed from this node and transmit them to the next node.

Description

technical field [0001] The invention relates to a dense wavelength division multiplexing system, in particular to an optical sending unit capable of improving wavelength utilization in the dense wavelength division multiplexing system and a system formed by using the optical sending unit. Background technique [0002] Dense Wave Division Multiplexing (DWDM for short) transmits multiple wavelengths with relatively close wavelengths in one optical fiber, thereby improving the utilization rate of a single optical fiber and greatly expanding the bandwidth of the original optical fiber communication. Usually, the channel spacing of DWDM is less than 1nm. Most of the DWDMs commonly used in optical communication networks are divided into 32 or more wavelengths in the 1530nm-1565nm band. Common DWDM systems are end-to-end communication, such as figure 1 shown. Generally, the wavelength of the signal received from the client-side device does not conform to the standard wavelength o...

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Problems solved by technology

Although this method can improve the wavelength utilization efficiency, it needs to add some additional equipment at nodes A, B and C, which will increase the investment and construction cost

Secondly, compared to the current DXC, ADM and other equipment, the communication bandwidth between nodes A, B, and C is a large-grained business scheduling, which will occupy the precious cross-resources of DXC and ADM and reduce the operating efficiency of the system. Therefore, it is not widely used at present

[0007] In practical application, the above scheme has the following problems: the wavelength utilization rate of communication between multiple points in the existing DWDM system is low, and the bandwidth that each wavelength can carry is not fully utilized, especially when low-speed connections occupy a relatively large proportion When the wavelength utilization efficiency of the whole system is relatively low; OADM has a large loss of optical signals, and the signal transmission quality needs to be improved; and the usage of OTU is large, and the system cost is high.

[0008] The main reason for this situation is that in the existing DWDM system, no matter how much end-to-end business bandwidth is required, and no matter how much communication bandwidth each wavelength is, the business carried by each wavelength is end-to-end, so it cannot Make full use of the bandwidth of each wavelength; the usual OADM has a relatively large loss of optical signals, resulting in a decrease in signal transmission quality; each end-to-end communication requires a pair of OTUs. When the number of nodes communicating in pairs increases, the required OTU increases with the square law of the number of nodes, so the OTU usage of multi-node pairwise communication is relatively large

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