公开(公告)号：US11112316B2

公开(公告)日：2021-09-07

申请号：US16323649

申请日：2018-02-11

Applicant: Huazhong University of Science and Technology

Inventor： Ping Lu ,  Wenjun Ni ,  Deming Liu ,  Xin Fu ,  Hao Liao

IPC: G01J5/00 ,  G01K11/32 ,  G01J5/08

Abstract: An optical fiber temperature sensor includes a broadband light source, a first optical fiber patch cord, a first single-mode optical fiber, a single-hole twin-core eccentric core optical fiber, a second single-mode optical fiber, a second optical fiber patch cord, and an optical spectrum analyzer.

公开(公告)号：US10161792B2

公开(公告)日：2018-12-25

申请号：US15526933

申请日：2016-08-22

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Changjian Ke ,  Deming Liu ,  Chen Xing ,  Ke Zhang

IPC: G01J3/02 ,  G01J3/44 ,  G02B6/27 ,  G01J3/447

Abstract: The present invention discloses a device and a method for realizing spectral polarization-independent measurement based on a frequency domain depolarization structure. The device comprises a pump light source module, a depolarization module, an SBS effect generation module and a data acquisition and spectrum reconstruction module. The method comprises: emitting laser light having a fixed polarization state from the pump light source module; the laser light from an output end of the pump light source module passing through the depolarization module to become depolarized light; inputting the depolarized light as pump light into the SBS effect generation module to interact with signal light under test input from the outside into the SBS effect generation module; and after amplifying the signal light under test through the SBS effect generation module, performing data acquisition processing through the data acquisition and spectral reconstruction module and finally obtaining a spectrum of a signal under test. The present invention can eliminate the problems that the acquired spectral information is not accurate, the power measurement is not stable and the like when a spectral measurement device based on an SBS effect measures an input signal light having arbitrary polarization state, and has an important application prospect.

公开(公告)号：US10122445B2

公开(公告)日：2018-11-06

申请号：US15314014

申请日：2016-09-20

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Changjian Ke ,  Deming Liu ,  Guo Yin ,  Chen Xing

IPC: H04B10/00 ,  H04B10/079

Abstract: A method for enhancing optical signal-to-noise ratio measuring precision by correcting spectral resolution is provided, which can obtain optical signal-to-noise ratio with enhanced measuring precision, by measuring actual power of broad spectrum signals in a certain bandwidth, determining the sum of the power of the sampling points for the broad spectrum signals in the bandwidth by using an optical spectrum analyzer, obtaining the corrected resolution of the optical spectrum analyzer, and replacing the setting resolution of the optical spectrum analyzer with the corrected resolution. The method can effectively solve the problem of large OSNR measuring error resulted from the difference between the setting resolution and the actual resolution of optical spectrum analyzer. The method is applicable to correct resolution for all optical spectrum analyzers, and also applicable to enhance the measuring precision for all OSNR measuring methods based on spectrum analysis, and has the advantages of easiness to handle and implement.