Precise Brillouin gain and phase spectra measurements in coherent BOTDA sensor with phase fluctuation cancellation

Z Li, L Yan, L Shao, W Pan, B Luo, J Liang, H He… - Optics express, 2016 - opg.optica.org
In order to cancel phase fluctuation induced Brillouin gain spectrum (BGS) and Brillouin
phase spectrum (BPS) distortions, a new scheme with phase fluctuation cancellation (PFC) …

Coherent BOTDA sensor with single-sideband modulated probe light

Z Li, L Yan, L Shao, W Pan, B Luo… - IEEE Photonics …, 2016 - ieeexplore.ieee.org
In order to optimize the coherent Brillouin optical time domain analysis (BOTDA) sensor for
more effective chromatic dispersion (CD) suppression, single-sideband intensity-modulated …

Phase fluctuation cancellation for coherent-detection BOTDA fiber sensors based on optical subcarrier multiplexing

Z Li, Y Zhou, B Jiang, X Gan, L Yan, J Zhao - Optics Letters, 2021 - opg.optica.org
The employment of coherent detection in a Brillouin optical time domain analysis (BOTDA)
fiber sensor brings benefits, including signal-to-noise ratio enhancement, non-local effect …

Enhanced BOTDA sensors based on brillouin phase recovery using Kramers-Kronig relation

K Zeng, G Yang, S Liu, J Li, L Li, L Wang… - IEEE Sensors …, 2021 - ieeexplore.ieee.org
We have proposed and demonstrated an enhanced Brillouin optical time-domain analysis
(BOTDA) sensing system with fast measurement speed based on the Brillouin phase …

SNR-enhanced fast BOTDA combining channel estimation technique with complementary pulse coding

C Zhao, M Tang, R Liao, H Wu, S Fu - IEEE photonics journal, 2018 - ieeexplore.ieee.org
We have implemented a BOTDA that combines channel estimation and complementary
coding technique for high performance distributed sensing. The use of OFDM-modulated …

Gain vs phase in BOTDA setups

A Lopez-Gil, X Angulo-Vinuesa… - … on Optical Fibre …, 2016 - spiedigitallibrary.org
We evaluate the Brillouin frequency shift (BFS) determination error when using the Brillouin
phase spectrum (BPS) instead of the Brillouin gain spectrum (BGS) in BOTDA setups. We …

Pulse coding technique in differential cross-spectrum BOTDR for improving the Brillouin frequency accuracy and spatial resolution

MSD Zan, MHH Mokhtar, MM Elgaud… - 2020 IEEE 8th …, 2020 - ieeexplore.ieee.org
We propose a novel technique to deploy Golay code in our previously reported differential
cross-spectrum BOTDR (DCS-BOTDR) fiber sensor technique to improve the Brillouin …

Evaluation of the accuracy of BOTDA systems based on the phase spectral response

A Lopez-Gil, MA Soto, X Angulo-Vinuesa… - Optics …, 2016 - opg.optica.org
We evaluate the Brillouin frequency shift (BFS) determination error when utilizing the
Brillouin phase spectrum (BPS) instead of the Brillouin gain spectrum (BGS) in BOTDA …

Gain dependence of the phase-shift spectra measured in coherent Brillouin optical time-domain analysis sensors

J Mariñelarena, J Urricelqui… - Journal of Lightwave …, 2016 - opg.optica.org
We report on the effects of large pump pulse powers on Brillouin optical time-domain
analysis (BOTDA) sensors based on phase-modulated probe wave and coherent self …

Nonlocal effect compensation in frequency-fixed probe based BOTDA sensor

S Wang, Z Yang, X Hong, W Lin, J Wu - Journal of Lightwave …, 2018 - opg.optica.org
The robustness of a recently proposed Brillouin optical time-domain analysis sensor based
on dual-tone probe wave with fixed frequency separation is deeply studied. It is discovered …