公开(公告)号：US20240426640A1

公开(公告)日：2024-12-26

申请号：US18456144

申请日：2023-08-25

Applicant: SOUTHWEST JIAOTONG UNIVERSITY

Inventor： Lianshan Yan ,  Haijun He ,  Lin Jiang ,  Anlin Yi ,  Xihua Zou ,  Wei Pan

IPC: G01D5/353

Abstract: The present invention discloses an integrated system for optical fiber sensing and communication through sharing co-frequency resources. Specifically, the system consists of two parts: optical path detection and circuit demodulation. The entire system consists of a continuous wave laser, a fiber coupler, a polarization controller, a mach-zehnder modulator, an arbitrary waveform generator, an erbium-doped fiber amplifier, an optical filter, an optical fiber annular, an optical fiber, a photodetector, a data acquisition device, a balance detector and a data acquisition card. A transmission optical signal and a sensing detection light are generated by the same laser, transmission performance and sensing performance of the system are changed by adjusting modulation power of a transmission signal, the transmission signal is obtained by using direct detection at far-end, a sensing signal is obtained by using heterodyne coherent detection at local-end. The present invention provides a simple, compact and high-efficiency integrated system for co-frequency sharing optical fiber sneisng and communication, to solve the deficiencies of the existing integrated system in practical applications.

公开(公告)号：US12101392B2

公开(公告)日：2024-09-24

申请号：US17518650

申请日：2021-11-04

Applicant: Southwest Jiaotong University

Inventor： Lianshan Yan ,  Lin Jiang ,  Yan Pan ,  Anlin Yi ,  Wei Pan

IPC: H04L9/00 ,  H04L9/08 ,  H04L9/30 ,  H04L27/152

CPC classification number: H04L9/001 ,  H04L9/0858 ,  H04L9/3066 ,  H04L27/1525

Abstract: A coherent detection-based high-speed chaotic secure transmission method includes: at a transmit terminal in a chaotic secure transmission system, optically coupling an optical chaotic carrier and transmission information by using an orthogonal basis to mask the transmission information by using a noise-like feature of the chaotic carrier, so as to obtain a chaotic masked signal; adding a fast phase disturbance and a fast polarization disturbance to the chaotic masked signal and transmitting the chaotic masked signal over an optical fiber transmission link; and at a receive terminal, obtaining the chaotic masked signal through coherent detection, compensating the chaotic masked signal for linear and nonlinear effects through digital signal processing, and using a polarization orthogonal basis- or phase orthogonal basis-based chaotic decryption algorithm to separate the chaotic carrier from the signal so as to complete decryption.