Quantum classical common fiber transmission signal receiving device

By combining a filtering module and a coherent detection module, efficient separation and detection of quantum classical signals are achieved, solving the problems of fiber optic link loss and high cost. It has the advantages of narrow filtering bandwidth, adjustable center wavelength, and high integration, avoiding the deployment of new types of optical fibers.

CN121664320APending Publication Date: 2026-03-13WUHAN OPTICAL VALLEY INFORMATION OPTOELECTRONICS INNOVATION CENT CO LTD
5 Cites 0 Cited by

Patent Information

Application Number
CN202511780194.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-28
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

In existing technologies, when quantum signals and classical signals co-propagate in optical fibers, the nonlinear noise introduced by the classical signals interferes with the quantum signals, and the migration to the O-band leads to high fiber link loss. The deployment of new optical fibers is costly and difficult to implement.

Method used

The signal light is separated into quantum signal light and classical signal light by a filtering module. Efficient separation is achieved by optical components such as cascaded micro-rings and Mach-Zehnder interferometers. The classical and quantum signals are detected and analyzed by a coherent detection module, avoiding migration to the O-band and deployment of new optical fibers.

Benefits of technology

It achieves efficient separation and detection of quantum classical signals, reduces fiber optic link loss and cost, solves the noise crosstalk problem, and does not require the deployment of new optical fibers. It has narrow bandwidth, adjustable center wavelength, and high integration.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to a quantum classical common-fiber transmission signal receiving device, and the device comprises a filtering module which is used for filtering signal light, and separating quantum signal light and classical signal light; the quantum state analysis module is connected with the filtering module, and the quantum state analysis module is used for receiving the quantum signal light and performing projection measurement on the quantum state subjected to time phase encoding; and the coherent detection module is connected with the filtering module, and the coherent detection module is used for receiving the classical signal light and the local oscillation light and carrying out coherent detection on the IQ modulated classical signal. According to the invention, the filtering module is arranged to realize efficient separation of the classical signal and the quantum signal, and the coherent detection module and the quantum state analysis module can detect and analyze the classical signal and the quantum signal at the same time, so that the problem of noise crosstalk in a quantum classical co-transmission scene is solved; and moreover, the quantum signal does not need to be migrated to an O wave band, a novel optical fiber does not need to be deployed, relatively high optical fiber link loss is not introduced, and the cost can be reduced.
Need to check novelty before this filing date? Find Prior Art