Browsing by Author "Uyar, Faruk"
Now showing items 1-11 of 11
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94.8 km-range direct detection fiber optic distributed acoustic sensor
(Optical Society of America(OSA), 2019)This work demonstrates an ultra-long range direct detection fiber optic distributed acoustic sensor which can detect vibrations at a distance of 94.8 km with 10 m resolution along the sensing fiber. -
Development and characterization of a direct detection fiber optic distributed acoustic sensor
(Bilkent University, 2018-09)Phase-sensitive optical time domain re ectometer (ø-OTDR) based distributed acoustic sensor (DAS) systems have attracted increasing attention in recent years due to their remarkable advantages in a wide range of industrial ... -
A direct detection fiber optic distributed acoustic sensor with a mean SNR of 7.3 dB at 102.7 km
(Institute of Electrical and Electronics Engineers Inc., 2019)In this work, we present the experimental results of a direct detection π-OTDR based distributed acoustic sensor system. The system uses two cascaded acousto-optic modulators in order to generate optical pulses with very ... -
Field test and fading measurement of a distributed acoustic sensor system over a 50 km-long fiber
(SPIE - International Society for Optical Engineering, 2018)In this study, we present a direct detection distributed acoustic sensor based on phase-sensitive optical time domain reflectometer (φ-OTDR) with long sensing range and high signal-to-noise ratio (SNR), which is field-tested ... -
An investigation of fidelity regions in the dual-pulse 𝝓-OTDR systems
(The Optical Society, 2021)The dual-pulse interrogation enables the phase extraction from the intensity of the backreflection signal in 𝜙-OTDR systems. We investigate the high and low fidelity regions in the back-reflected signal by analyzing the ... -
The investigation of Rayleigh backscattered signal statistics in a φ-OTDR system incorporating optical pre-amplifier
(IEEE, 2020)We theoretically model and experimentally demonstrate the photon statistics of Rayleigh backscattered signal in a ϕ-OTDR based distributed fiber optical sensor in the presence of amplified spontaneous emission noise caused ... -
A parity-time-symmetric optoelectronic oscillator with polarization multiplexed channels
(Institute of Physics Publishing Ltd., 2022-04-05)In this manuscript, we experimentally demonstrate a parity-time-symmetric optoelectronic oscillator (OEO) with polarization multiplexed channels. We obtained a microwave single-mode oscillation at 9.5 GHz with phase noise ... -
The pulse shape effect on signal-to-noise ratio for φ-OTDR systems
(Optica Publishing Group, 2021)We experimentally investigate the effect of the probe pulse shape on the performance of φ-OTDR based distributed vibration sensors by comparing the SNR values for rectangular, Gaussian and triangular pulses. -
A Simple method for enhancing the SNR in direct detection φ-OTDR based distributed acoustic sensors
(IEEE, 2020)A simple and effective method for increasing the SNR and range in φ-OTDR based direct-detection distributed acoustic sensors is proposed and experimentally verified. The proposed method results in ~11 dB SNR improvement at 66 km. -
A simple parity-time-symmetric optoelectronic oscillator based on all-fiber coupling
(The Optical Society, 2021)We experimentally demonstrate a simple parity-time-symmetric optoelectronic oscillator based on all-fiber coupling with single-mode microwave oscillation at 9.5 GHz possessing a phase noise value of −116.2 dBc/Hz at 10 kHz offset. -
Spatial resolution analysis of dual-pulse ϕ-OTDR systems
(Optica Publishing Group, 2021)This work analyzes the spatial resolution of the dual-pulse -OTDR systems by changing the dual-pulse parameters and demonstrates that the spatial resolution corresponds to half of the fiber region occupied by the dual-pulse train.
