Synthetic fiber qkd system of quantum channel and classical channel and its transmission method

Abstract

The invention discloses a combined fiber QKD system of a quantum channel and a classical channel and a transmission method thereof. The system comprises a sending end and a receiving end; the system further comprises a first classical communication device and a second classical communication device; the sending end comprises a first core board, a first FPGA main control module, a first quantum optical module, a first synchronous optical module and a first wave combining and dividing device; the receiving end comprises a second core board, a second FPGA main control module, a second quantum optical module, a second synchronous optical module and a second wave combining and dividing device; the first classical communication device is connected with the first core board through an internet access PHY chip; and the second core board is connected with the second classical communication device through the internet access PHY chip. The quantum channel in the invention can share the optical fiber with the existing classical communication device, and parallel transmission can be performed in one optical fiber, so that the optical fiber resource is greatly reduced, the cost is saved, two manners of an internet access and an optical port are compatible, and the product universality is better.

Description

technical field [0001] The invention relates to a quantum key distribution system, in particular to a combined fiber QKD system of a quantum channel and a classical channel and a transmission method thereof. Background technique [0002] The composite fiber system of quantum channel and classical channel solves the high cost caused by laying dedicated quantum channel optical fiber, simplifies the deployment of quantum cryptography network, and promotes the pace of quantum cryptography communication network construction. However, due to the huge difference in light intensity between the quantum signal and the classical signal, the nonlinear noise generated by the classical signal will affect the QKD device. However, the negotiation signal in QKD is also a classical signal. In QKD, negotiation signals are needed to process data. How to implement negotiation signals in WDM systems to ensure the normal operation of QKD systems without affecting classical communication systems is...

AI Technical Summary

Problems solved by technology

In the above two methods, the optical fiber occupied by the quantum channel can only be used as a QKD device, and cannot be transmitted in parallel with the classical communication device in the same optical fiber

Images