Method for reducing influence of random frequency offsets of lasers in flexible grid elastic optical network

Abstract

The invention discloses a method for reducing influence of random frequency offsets of lasers in a flexible grid elastic optical network. The method comprises the following steps of firstly, equaling dividing a fixed-frequency grid into a plurality of fine-grained frequency grids; secondly, carrying out route and wavelength assignment on business according to source host nodes of the business, the business flow demand and current network resources, wherein the frequency grids assigned by each source host node are guaranteed to be continuous during assignment; and lastly, carrying out compression on a frequency space of each group of continuous frequency grids, wherein the compression of the frequency space includes two ways, one way is compression without spectrum overlay, which can be received and restored through a conventional method, and the other way is compression with spectrum overlay, which can be restored by a bufferfly equalizer. Through compression of the frequency space of the continuous frequency grid, the mutual influence between the random frequency offsets of the lasers at different source host nodes can be reduced, and the transmission performance of the flexible grid elastic optical network is improved.

Description

technical field [0001] The invention belongs to the technical field of flexible grid elastic optical network, and more specifically relates to a method for reducing the influence of random frequency deviation of lasers in flexible grid elastic optical network. Background technique [0002] With the development of broadband services, such as data center services and big data services, optical networks are required to have the characteristics of ultra-large capacity, dynamic flexibility, and service self-adaptation. The traditional WDM (Wavelength Division Multiplexing, wavelength division multiplexing) system is limited by the fixed grid, which makes the network optical wavelength utilization rate low, the optical channel lacks flexibility, and the optical signal is not flexible enough, which cannot meet the future service-oriented network development needs. In order to overcome the above problems, it can be considered to further divide the spectrum bandwidth of the fixed gri...

AI Technical Summary

Problems solved by technology

There are mainly two traditional frequency grid allocation methods: one allocation method is to allocate as many continuous frequency grids as possible for the services corresponding to the same source and sink nodes, and the allocated multiple continuous frequency grids are regarded as a super channel Switching and routing are performed, so the random frequency offset will only affect the grid at the edge, and the signal is less affected by the random frequency offset, but it is easy to generate spectrum fragments in this spectrum resource allocation, resulting in waste of spectrum resources and frequency grid allocation. Inflexible; another division method is to allocate independent and fine-grained frequency grids, that is, first divide the fixed frequency grid of 50 GHz into multiple fine-grained frequency grids, and support the transmission of fine-grained sub-wavelength signals At the same time, it can realize the change of service modulation format, better realize service matching and flexible transmission, and improve the overall performance index of the network while improving the spectrum utilization rate, so as to meet the transmission requirements of large capacity, high efficiency and low energy consumption in the future, but The random frequency offset of the laser has a significant impact on this independent, fine-grained signal

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