Polarization Properties of Coherently Superposed Rayleigh Backscattered Light in Single-Mode Fibers

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Polarization Properties of Coherently Superposed Rayleigh Backscattered Light in Single-Mode Fibers
Title:
Polarization Properties of Coherently Superposed Rayleigh Backscattered Light in Single-Mode Fibers
Journal Title:
Sensors
Publication Date:
11 September 2023
Citation:
Dong, H., Zhang, H., & Hu, D. J. J. (2023). Polarization Properties of Coherently Superposed Rayleigh Backscattered Light in Single-Mode Fibers. Sensors, 23(18), 7769. https://doi.org/10.3390/s23187769
Abstract:
The properties of the state of polarization (SOP) and the degree of polarization (DOP) of Rayleigh backscattered light (RBL) in single-mode fibers (SMF) are investigated theoretically and experimentally when the incident probe is a perfectly coherent continuous-wave (CW) light. It is concluded that the instantaneous DOP of the coherently superposed RBL is always 100%, and the instantaneous SOP is determined by the distributions of the birefringence and the optical phase along the SMF. Therefore, the instantaneous SOP of the coherently superposed RBL does not have a constant relationship with the SOP of the incident CW probe. Furthermore, the instantaneous SOP varies randomly with time because the optical phase is very sensitive to ambient temperature and vibration even in the lab environment. Further theoretical derivation and experimental verification demonstrate, for the first time, that the temporally averaged SOP of the coherently superposed RBL has a simple constant relationship with the SOP of the incident CW probe, and the temporally averaged DOP is 1/3 in an SMF with low and randomly distributed birefringence. The derived formulas and obtained findings can be used to enhance the modelling and improve the performances of phase-sensitive optical time-domain reflectometry and other Rayleigh backscattering based fiber-optic sensors.
License type:
Attribution 4.0 International (CC BY 4.0)
Funding Info:
This research / project is supported by the A*STAR - RIE 2020 Industry Alignment Fund
Grant Reference no. : A19F1a0104
Description:
ISSN:
1424-8220
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