Wavelength allocation method for quantum signal and classical optical signal common-optical fiber transmission

Abstract

The invention discloses a wavelength allocation method for quantum signal and classical optical signal common-optical fiber transmission. In the method, a wide difference of signal power between a quantum signal and a classical optical signal is considered, the method aims at fiber nonlinear effects (mainly comprising four-wave mixing and raman scattering) and crosstalk effect in the common-optical fiber transmission of the signals, and the wavelength allocation method including interleaved channels, unequalled all channel frequency spaces and maximum frequency space between adjacent quantum channels and synchronous optical channels is designed. The design of the method is simple, compared with a wavelength division multiplexing system with equal frequency space, under a premise of the ensured same bandwidth availability ratio, an influence from four-wave mixing to the quantum signal and the classical optical signal can be completely avoided, interference from raman scattering and crosstalk to the quantum signal can be reduced, a farther secure transmission distance can be realized, and system performance can be improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a non-equal interval wavelength allocation method for user channel interleaving that eliminates the influence of four-wave mixing in co-fiber transmission of quantum signals and classical optical signals. This method is mainly used in the network where the quantum key distribution network and the classical optical network are integrated through the wavelength division multiplexing technology. It is a method that can effectively avoid the influence of four-wave mixing on the quantum signal, especially in the field of optical communication technology. Background technique [0002] With the application and development of the Internet, information security has become an increasingly serious problem. With the continuous improvement of computer computing power, traditional symmetric and asymmetric encryption algorithms are undergoing severe tests, and traditional encryption meth...

AI Technical Summary

Problems solved by technology

[0008] It can be seen from formula (1) that for a WDM system with equal frequency intervals, the new frequency components generated by FWM will overlap with the signal frequency, especially for quantum signals, which will cause great interference and seriously affect the performance of the system

Moreover, simply reducing the power of the classical optical signal or increasing the frequency interval cannot effectively reduce the influence of four-wave mixing.

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