Equally-spaced wavelength allocation method for suppressing noise in multi-core optical fiber quantum key distribution system

The invention discloses an equally-spaced wavelength allocation method for suppressing noise in a multi-core optical fiber quantum key distribution system. The method is suitable for a space division multiplexing quantum key distribution light-emitting network. According to the method, main noise such as intra-core noise, inter-core noise, forward noise and backward noise involved in a space division multiplexing system is mainly considered, a quantum channel equal-frequency interval wavelength allocation scheme is provided by taking minimization of noise on a quantum channel and maximization of a security key rate as targets, the channel resource utilization rate can be ensured to be improved, and the quantum channel equal-frequency interval wavelength allocation efficiency can be improved. And the security key rate is improved, and the security transmission distance is expanded. According to the invention, a technical foundation is laid for fusion transmission of quantum key distribution and a classical opt