OTN routing optimization method based on OSNR in provincial network

Abstract

The invention discloses a provincial network OTN route optimization method based on OSNR, belonging to the communication network field. The method comprises the following steps: S1, establishing a network model; 2, signal delay constraint; S3: OSNR constraint of optical channel segment; S4: calculating a service risk degree and a network-wide risk balance degree; 5, establishing a problem model; 6, excluding items that do not satisfy the delay constraint and the OSNR constraint in all possible paths, the case that there is no solution being not taken into account of; S7: traversing all the paths excluding the constraint, calculating the whole network risk balance value R of each path, and finding the path that makes R minimum, namely, the local optimal path. The invention can minimize therisk of the whole network under the condition of satisfying the time delay constraint.

Description

Technical field [0001] The invention relates to an OSNR-based OTN route optimization method of a provincial network, which belongs to the technical field of communication. Background technique [0002] With the advancement and maturity of smart grid technology, more and more large-connected, high-traffic services are carried on the power communication network. In order to meet this demand, power grid companies use optical transmission network (Optical Transmission Networks, OTN) technology to apply to backbone communication network projects, and the construction of the power communication OTN with the characteristics of ultra-high speed, ultra-large bandwidth, and ultra-long station distance transmission is a key task. one. [0003] OTN has created a new situation where the optical layer is independent of the electrical layer, and is the mainstream direction for future power communication network upgrades. OTN is the main carrier of the backbone communication network, and its net...

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Problems solved by technology

[0007] Based on the physical characteristics of the optical network and OTN transmission characteristics, the centralized control of the optical network is realized, and an OSNR-aware path optimization mechanism is proposed, and the optical signal-to-noise ratio performance is used as an important judgment condition for establishing an OTN optical path connection, but the network is not considered Effect of Structure Change on Optical Signal-to-Noise Ratio

The expression of the optical signal-to-noise ratio of the cascaded EDFA dense wavelength division multiplexing system is derived, and the expression of the equivalent noise index of the cascaded EDFA system is deduced from the definition of the EDFA noise index, but in the actual complex network environment, then There is a large error between the deduced optical signal-to-noise ratio expression of the cascaded system and the engineering measured value, and the corresponding analysis of the OSNR change caused by the network topology change in the actual situation has not been carried out; another research direction is The optical signal-to-noise ratio of the dense wavelength division system is calculated by studying the software of the dense wavelength division multiplexing system. There is also a lack of theoretical analysis of the disturbance of the optical signal-to-noise ratio parameter caused by the change of the network topology, and the change of the OSNR index parameter cannot be obtained through theoretical calculation.

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