Implementation method and device of all-optical OFDM (Orthogonal Frequency Division Multiplexing) signal photosphere network code

Abstract

The invention relates to an implementation method and an implementation device of an all-optical OFDM (Orthogonal Frequency Division Multiplexing) signal photosphere network code. The method comprises the following steps of: splitting two paths of all-optical OFDM signals into orthogonal subcarrier signals at a coding node so as to realize the widening for signal pulse width; and merging the output into new all-optical OFDM signals by using all-optical logical difference or the coding calculation of the subcarrier signals realizing identical frequency. A decoding node and the coding node have similar structures and functions, and the original input all-optical OFDM signals are recovered through solution difference or calculation. The device comprises a demultiplex module, a pulse widening module, an all-optical logical difference or module and a multiplex module at the coding and decoding nodes, an optical amplification module and a dispersion compensation module in optical fiber transmission. The method and the device use network coding thought to realize the purpose of all-optical OFDM signal network multicast, reduce the difficulty of pulse bit-oriented alignment and improve the tolerance of pulse delay difference by using the pulse widening method before the calculation of coding and decoding.

Description

technical field [0001] The invention relates to a method and device for realizing optical layer network coding, in particular to a method and device for realizing optical layer network coding for all-optical OFDM signals, belonging to the technical field of communication. Background technique [0002] In the traditional multicast communication network, the transmitted information is only transmitted to the target node in the way of store and forward through the intermediate node of the network, generally without any data processing. The proposal of network coding technology has changed the routing mechanism of traditional multicast. This technology allows network nodes to encode and process the transmitted information in an appropriate manner, so as to achieve the theoretical maximum transmission capacity of the multicast network. At the same time, it can effectively improve network throughput, balance network load, improve bandwidth utilization, and enhance network performa...

AI Technical Summary

Problems solved by technology

However, some characteristics of optical networks pose certain restrictions on the application of network coding in optical multicast networks.

The computing power of the electrical domain is strong, and the linear operation at the coding node can be easily realized, while the optical random storage device is lacking in the optical domain, the logic is simple, the computing power is weak, and it is difficult to complete the complex linear codec operation

Therefore, the existing optical layer network coding algorithms, on the one hand, mainly use photoelectric-optical conversion to realize traditional network coding in the optical network, but the photoelectric-optical conversion method tends to increase system overhead, reduce system performance, and become a bottleneck for high-speed information transmission. Does not reflect the advantages of network coding and all-optical networks

On the other hand, in the existing network that uses network coding to realize all-optical multicast, network coding has problems such as the coding method and the design of coding nodes are too complicated, it is difficult to realize under the current optical device conditions, and it has strict requirements on the network structure.

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