Erasing method and device suitable for multi-carrier frequency domain modulation signal

Abstract

An erasing method and device suitable for a multi-carrier frequency domain modulation signal relate to the field of multi-carrier frequency domain modulation in an optical communication system, and comprise the following steps: separating a part of signals from a transmission link of a multi-carrier frequency domain signal to perform data sampling, and performing FFT on a sampled digital signal to obtain an FFT signal; de-mapping and recovering the loaded signal according to the corresponding relationship of the frequency spectrum positions; selecting a frequency point needing clock recovery, evaluating phase drift through the phase difference of the frequency point after two adjacent FFT, and adjusting the frequency of a local reference clock by taking the average value of multiple adjacent phase drift results; and when the adjusted reference clock is synchronous with the sending end clock, generating a subcarrier signal with the same strength and opposite phases at a frequency point where subcarriers need to be erased, carrying out IFFT, and superposing an obtained result with a multi-carrier frequency domain signal of a transmission link. According to the invention, the modification of the optical label data from 1 to 0 is realized, so that the multi-carrier frequency domain modulation signal can be flexibly modified as required.

Description

technical field [0001] The invention relates to the field of multi-carrier frequency domain modulation in an optical communication system, in particular to an erasing method and device suitable for multi-carrier frequency domain modulation signals. Background technique [0002] At present, the optical communication network is constantly developing in the direction of higher speed, larger capacity and longer distance. A variety of modulation formats play their own advantages in different scenarios. Among them, multi-carrier frequency-domain modulation signals are receiving more and more attention due to their high spectral efficiency and ability to achieve higher rates and bandwidths. At the same time, with the substantial increase in network capacity and speed, the management and maintenance of different channels is particularly important. [0003] In the optical network system, in order to facilitate management, the optical label based on multi-carrier frequency domain mod...

AI Technical Summary

Problems solved by technology

[0004] However, in the existing optical tag system based on multi-carrier frequency domain modulation, the optical tag data carried is fixed, and there is still a lack of flexible solutions for scenarios where optical tag data needs to be modified at network nodes

Although based on the existing technology, the same method of loading the optical tag signal as the sending end can be used to modify the data from 0 to 1, but it is still impossible to modify the data from 1 to 0

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