Simultaneous demodulation comparison of fiber-optic Fabry–Perot sensors connected in parallel and series

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jie Liao ◽  
Wenlin Feng ◽  
Xiaozhan Yang
Keyword(s):  
Fiber Optic ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Parallel Structure ◽  
Theoretical Formula ◽  
Series Connection ◽  
Fitting Method ◽  
Fabry Perot ◽  
Spectrum Fitting

Abstract In this work, the spectra of two fiber-optic Fabry–Perot sensors in parallel and series connection were studied. The spectrum of the parallel structure is a simple superposition of the two sensors’ spectrum, and that of the series structure can be regarded as the interference occurring in two Fabry–Perot sensors successively. The sensors’ optical path difference can be obtained and separated by using the theoretical formula to fit the normalized spectrum of parallel or series structure, which showed that two or more Fabry–Perot sensors can be simultaneously demodulated by the spectrum fitting method.

scholarly journals Linear analysis of optical path difference of variable-gap Fabry-Perot interferometer

2021 ◽  
Vol 42 (3) ◽  
pp. 494-498
Author(s):  
HAN Jun ◽  
◽  
◽  
GAO Bo ◽  
ZHANG Fang ◽  
...  
Keyword(s):  
Linear Analysis ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Fabry Perot

scholarly journals Low-Finesse Fabry–Pérot Interferometers Applied in the Study of the Relation between the Optical Path Difference and Poles Location

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 453 ◽  
Author(s):  
José Trinidad Guillen Bonilla ◽  
Héctor Guillen Bonilla ◽  
Verónica María Rodríguez Betancourtt ◽  
María Eugenia Sánchez Morales ◽  
Juan Reyes Gómez ◽  
...  
Keyword(s):  
System Analysis ◽  
Cavity Length ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Fiber Sensors ◽  
Fabry Perot ◽  
The Laplace Transform ◽  
Frequency Components ◽  
The Fourier Transform

Interferometry sensors are frequently analyzed by applying the Fourier transform because the transformation separates all frequency components of its signal, making its study on a complex plane feasible. In this work, we study the relation between the optical path difference (OPD) and poles location theoretically and experimentally, using the Laplace transform and a pole-zero map. Theory and experiments are in concordance. For our study, only the cosine function was considered, which is filtered from the interference pattern. In experimental work, two unperturbed low-finesse Fabry–Pérot interferometers were used. First, a Fabry–Pérot interferometer that has a cavity length of ~ 1.6 mm was used. Its optical path difference was 2.33 mm and the poles were localized at points ± i 12 . rad/nm. Secondly, a Fabry–Pérot interferometer with a cavity length of ~ 5.2 mm was used, and its optical path difference was 7.59 mm and the poles were localized at points ± i 40.4 rad/nm. Experimental results confirmed the theoretical analysis. Our proposal finds practical application for interferometer analysis, signal processing of optical fiber sensors, communication system analysis, and multiplexing systems based on interferometers.

Rhombic optical path difference bias white light interferometric fiber-optic gyroscope

2021 ◽  
Vol 46 (6) ◽  
pp. 1502
Author(s):  
Ang Li ◽  
Zhenguo Jing ◽  
Qiang Liu ◽  
Yueying Liu ◽  
Yang Cheung ◽  
...  
Keyword(s):  
White Light ◽  
Fiber Optic ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Fiber Optic Gyroscope

Peak-to-peak tracking method for measurement of optical path difference: Revisited

Optik ◽  
2015 ◽  
Vol 126 (24) ◽  
pp. 5420-5422
Author(s):  
H.H. Ley ◽  
A. Yahaya ◽  
Y. Munajat
Keyword(s):  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Tracking Method ◽  
Peak Tracking

Optical T-Bench Method for Measurement of Optical Path Difference

1963 ◽  
Vol 1 (6) ◽  
Author(s):  
Francis E. Washer ◽  
Walter R. Darling
Keyword(s):  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path

Thermo-Fluid Design Simulation of Nd3+ POCl3 Transverse Flow Liquid Laser Cavity

2021 ◽  
pp. 1-31
Author(s):  
Vinod Singh ◽  
Gaurav Singhal ◽  
Prabal Talukdar
Keyword(s):  
Refractive Index ◽  
Temperature Gradient ◽  
Flow Rate ◽  
Optical Pumping ◽  
Gain Medium ◽  
Optical Path Difference ◽  
Path Difference ◽  
Transverse Flow ◽  
Optical Path ◽  
Liquid Laser

Abstract CFD based thermal design of a transverse flow optical cavity is carried out for 1 kW Nd3+ POCl3 liquid laser source to investigate temperature and velocity distribution in the optical pumping region of the cavity. Temperature gradient and turbulence both affect the refractive index of the liquid gain medium, which results in optical path difference, divergence and hence, poorer quality of the laser beam. The main purpose of this design is to achieve uniform flow and least temperature gradient in the optical pumping region so that the optical path difference can be minimized and a good beam quality can be achieved. CFD model has been developed for carrying out thermo-fluid simulations for this thermal system and based on these simulations, an optimum geometry of inlet ports along with their position from optical pumping region have been proposed. A user defined function (UDF) is incorporated for the input of spatially varying heat source term in each cell of the optical pumping region of the cavity. Variations in refractive index and optical path difference are estimated from the temperature data using another UDF. Simulation reveals that mass flow rate between 1.5 kg/s to 2.0 kg/s maintains the optical homogeneity of gain medium. Preliminary experiments have been carried out to demonstrate the effect of flow rate on the beam divergence and thereby exhibiting the importance of present simulation work.

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