scholarly journals Distortion-corrected phase demodulation using phase-generated carrier with multitone mixing

2020 ◽  
Vol 28 (24) ◽  
pp. 36849
Author(s):  
Yisbel Marin ◽  
Philippe Velha ◽  
Claudio J. Oton
Keyword(s):  
Phase Generated Carrier ◽  
Phase Demodulation

Phase demodulation method for fringe pattern in alignment of nanometer lithography

2010 ◽  
Author(s):  
Feng Xu ◽  
Song Hu ◽  
Zhengquan Luo ◽  
Shaolin Zhou
Keyword(s):  
Fringe Pattern ◽  
Demodulation Method ◽  
Phase Demodulation

Coherent Optical Receiver for Linear Optical Phase Demodulation

2007 ◽  
Author(s):  
Leif A. Johansson ◽  
Hsu-Feng Chou ◽  
Anand Ramaswamy ◽  
Jonathan Klamkin ◽  
Larry A. Coldren ◽  
...  
Keyword(s):  
Optical Receiver ◽  
Optical Phase ◽  
Linear Optical ◽  
Phase Demodulation

Two-frame tilt-shift error estimation and phase demodulation algorithm

2015 ◽  
Vol 40 (15) ◽  
pp. 3460 ◽  
Author(s):  
Maciek Wielgus ◽  
Zofia Sunderland ◽  
Krzysztof Patorski
Keyword(s):  
Error Estimation ◽  
Frame Tilt ◽  
Phase Demodulation

Reliability Demodulation Algorithm Design for Phase Generated Carrier Signal

2021 ◽  
pp. 1-12
Author(s):  
Changbo Hou ◽  
Jie Zhang ◽  
Yonggui Yuan ◽  
Jun Yang ◽  
Libo Yuan
Keyword(s):  
Algorithm Design ◽  
Phase Generated Carrier

scholarly journals Experimental Study on the Concept of Hollow-Core Photonic Bandgap Fiber Stethoscope

2018 ◽  
Vol 2018 ◽  
pp. 1-4
Author(s):  
Adel Abdallah
Keyword(s):  
Experimental Study ◽  
Relative Phase ◽  
Fiber Optic ◽  
Photonic Bandgap ◽  
Single Mode ◽  
Hollow Core ◽  
Photonic Bandgap Fiber ◽  
Photonic Bandgap Fibers ◽  
Relative Phase Shift ◽  
Phase Generated Carrier

An experiment is proposed to show the feasibility of using hollow-core photonic bandgap fibers (HC-PBF) in the fiber-optic interferometric stethoscopes to generally improve the sensitivity and overcome the problems associated with the electronic stethoscopes. In the experiment, the HC-1550 is used as a measuring arm of an unbalanced Mach-Zehnder interferometer (MZI) and the conventional single-mode optical fiber (SMF) is used as an isolated reference arm. Detection and demodulation of the relative phase shift is performed passively using phase-generated carrier homodyne technique (PGC). The proposed results indicate the significance of using HC-PBFs in the future stethoscopes.

scholarly journals Sub-Meter Spatial Resolution Phase-Sensitive Optical Time-Domain Reflectometry System Using Double Interferometers

2018 ◽  
Vol 8 (10) ◽  
pp. 1899 ◽  
Author(s):  
Shengwen Feng ◽  
Tuanwei Xu ◽  
Jianfen Huang ◽  
Yang Yang ◽  
Lilong Ma ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Bilateral Filtering ◽  
Rayleigh Backscattering ◽  
Detection Frequency ◽  
Optical Time Domain Reflectometry ◽  
Phase Sensitive ◽  
Optical Time ◽  
Phase Generated Carrier

An improved phase-sensitive optical time-domain reflectometry (φ-OTDR) system with sub-meter spatial resolution is demonstrated. Two Michelson interferometers (MIs) with different path length differences are used in the proposed system. One is 10 m, the other is 9.2 m. Two Rayleigh backscattering phase traces with different spatial resolution are obtained by a phase generated carrier (PGC) algorithm at adjacent times. After using differencing and adaptive 2-D bilateral filtering algorithms, a 0.8-m spatial resolution over 2 km is achieved. Experimental results indicate that the system shows an extraordinary linearity as high as 99.94% with amplitude-modulation and acquires a detection frequency from 5 to 500 Hz.

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