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.

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：US11860411B2

公开(公告)日：2024-01-02

申请号：US17980607

申请日：2022-11-04

Applicant: Southwest Jiaotong University

Inventor： Xihua Zou ,  Changjian Xie ,  Xiaojun Xie ,  Wei Pan ,  Lianshan Yan

IPC: G02B6/12

CPC classification number: G02B6/12011 ,  G02B2006/12164

Abstract: A super-compact arrayed waveguide grating (AWG) wavelength division multiplexer based on a sub-wavelength grating is provided and includes an input waveguide, a first planar waveguide, an arrayed waveguide, a second planar waveguide, and the output waveguide that are sequentially connected. The input waveguide has 1 port, and the output waveguide has 8 ports. The arrayed waveguide includes 50 equivalent uniform strip waveguides with the same length difference, and each of the equivalent uniform strip waveguides is configured as a sub-wavelength grating structure, thereby forming the effect of increasing group refractive index or transmission delay based on a slow light effect. The 8 channels with a channel spacing of 200 GHz have the minimum adjacent channel crosstalk of less than −27 dB, and the overall size is within 300×230 μm2. In the multiplexer, the overall integration size of the device is reduced by an order of magnitude.

公开(公告)号：US20240421239A1

公开(公告)日：2024-12-19

申请号：US18743136

申请日：2024-06-14

Applicant: Southwest Jiaotong University

Inventor： Xiaojun Xie ,  Chao Wei ,  Xihua Zou ,  Wei Pan ,  Lianshan Yan

IPC: H01L31/0304 ,  H01L31/0232 ,  H01L31/18

Abstract: An ultra-broadband waveguide-coupled photodetector on a TFLN platform is provided. Specifically, the waveguide-coupled photodetector on a TFLN-InP heterogeneous integration platform is prepared. An epitaxial layer is grown on a semi-insulating InP substrate by metal-organic chemical vapor deposition, and the epitaxial layer includes a n-contact layer, a sacrificial layer, a drift layer, a cliff layer, a quaternary compound layer, an absorption layer and a p-contact layer sequentially arranged in that order. The n-contact layer and the p-contact layer are heavily doped with InGaAs and InGaAsP, respectively. The absorption layer includes a depletion absorption layer with a thickness of 20 nm and a graded doping absorption layer with a thickness of 100 nm. The photodetector simultaneously improves bandwidth and responsivity, and can be compatible with mature silicon processes and applied to four-level pulse amplitude modulation data receiving systems.