Method for fusion of quantum key distribution and wavelength division multiplexing optical access network

Abstract

The invention discloses a method for fusion of quantum key distribution and a wavelength division multiplexing optical access network. In order to solve a problem of non-linear noise interference during fusion of a quantum key distribution system and a typical WDM-PON, the invention provides solutions at a time domain and a frequency domain respectively. Therefore, the raman scattering and four-wave mixing noise power of the quantum channel can be reduced substantially on the condition that the network architecture and working manner of the WDM-PON change as little as possible. The method has characteristics of high efficiency, low cost, and easy implementation and the like and thus a theoretical basis is provided for constructing a quantum key distribution access network with WDM-PON fusion.

Description

technical field [0001] This patent relates to the field of quantum communication, in particular to a quantum key distribution scheme integrated with a classical optical access network. Background technique [0002] The earliest reported quantum key distribution network experiment was in 1997 in the UK using an optical splitter to realize the key distribution between the sending end and three receiving ends. Subsequently, scientific research institutions in many countries have launched quantum key distribution experimental network research. However, the safe transmission distance of the QKD system based on weak optical pulses is limited. For long-distance wide area networks, trusted relays or quantum relays are needed to build actual networks. Quantum relay technology is not yet mature enough to be trusted. Relay security cannot be absolutely guaranteed, so the actual quantum key distribution experimental network is usually given priority to be implemented on the access netw...

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Problems solved by technology

The narrow-band filter and time-domain filter used in the above scheme have extremely high requirements on device performance, resulting in high cost, which is not conducive to practical application

Moreover, the main sources of interference noise for quantum signals when they are co-fiber-transmitted with classical signals are Raman scattering noise and four-wave mixing noise. The noise generated by these two nonlinear effects of optical fibers is likely to fall on the quantum channel. , so this noise cannot be filtered out by the frequency domain filter, and it will still bring great interference to the quantum key distribution system

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