scholarly journals Signal to Noise Ratio (SNR) Enhancement Comparison of Impulse-, Coding- and Novel Linear-Frequency-Chirp-Based Optical Time Domain Reflectometry (OTDR) for Passive Optical Network (PON) Monitoring Based on Unique Combinations of Wavelength Selective Mirrors

Photonics ◽  
2014 ◽  
Vol 1 (1) ◽  
pp. 33-46 ◽  
Author(s):  
Christopher Bentz ◽  
Lars Baudzus ◽  
Peter Krummrich
Keyword(s):  
Time Domain ◽  
Signal To Noise Ratio ◽  
Optical Network ◽  
Time Domain Reflectometry ◽  
Passive Optical Network ◽  
Frequency Chirp ◽  
Signal To Noise ◽  
Linear Frequency ◽  
Optical Time Domain Reflectometry ◽  
Optical Time

scholarly journals Time-expanded phase-sensitive optical time-domain reflectometry

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Miguel Soriano-Amat ◽  
Hugo F. Martins ◽  
Vicente Durán ◽  
Luis Costa ◽  
Sonia Martin-Lopez ◽  
...  
Keyword(s):  
Time Domain ◽  
Signal To Noise Ratio ◽  
Random Phase ◽  
Environmental Variable ◽  
Time Domain Reflectometry ◽  
Trade Offs ◽  
Optical Time Domain Reflectometry ◽  
Phase Sensitive ◽  
Spatio Temporal ◽  
Optical Time

AbstractPhase-sensitive optical time-domain reflectometry (ΦOTDR) is a well-established technique that provides spatio-temporal measurements of an environmental variable in real time. This unique capability is being leveraged in an ever-increasing number of applications, from energy transportation or civil security to seismology. To date, a wide number of different approaches have been implemented, providing a plethora of options in terms of performance (resolution, acquisition bandwidth, sensitivity or range). However, to achieve high spatial resolutions, detection bandwidths in the GHz range are typically required, substantially increasing the system cost and complexity. Here, we present a novel ΦOTDR approach that allows a customized time expansion of the received optical traces. Hence, the presented technique reaches cm-scale spatial resolutions over 1 km while requiring a remarkably low detection bandwidth in the MHz regime. This approach relies on the use of dual-comb spectrometry to interrogate the fibre and sample the backscattered light. Random phase-spectral coding is applied to the employed combs to maximize the signal-to-noise ratio of the sensing scheme. A comparison of the proposed method with alternative approaches aimed at similar operation features is provided, along with a thorough analysis of the new trade-offs. Our results demonstrate a radically novel high-resolution ΦOTDR scheme, which could promote new applications in metrology, borehole monitoring or aerospace.

scholarly journals Влияние дрейфа частоты лазера в фазочувствительной рефлектометрии

2019 ◽  
Vol 127 (10) ◽  
pp. 603
Author(s):  
А.А. Жирнов ◽  
К.В. Степанов ◽  
А.О. Чернуцкий ◽  
А.К. Федоров ◽  
Е.Т. Нестеров ◽  
...  
Keyword(s):  
Time Domain ◽  
Signal To Noise Ratio ◽  
Frequency Instability ◽  
Laser Frequency ◽  
Time Domain Reflectometry ◽  
Laser Source ◽  
Optical Time Domain Reflectometry ◽  
Phase Sensitive ◽  
Optical Time ◽  
Theoretical Results

AbstractThe influence of the laser frequency drift on the operation of phase-sensitive optical time domain reflectometry (φ-OTDR) systems is considered. Theoretical results based on a new numerical φ-OTDR model demonstrating the influence of the laser frequency instability on a signal are reported. This model is verified based on experimental data. It has been used to calculate the signal-to-noise ratio (SNR) of the system for different parameters of the laser source stability. As a result, quantitative requirements for lasers used in φ-OTDR systems are formulated.

scholarly journals Recent Advances in Phase-Sensitive Optical Time Domain Reflectometry (Ф-OTDR)

2021 ◽  
Vol 11 (1) ◽  
pp. 1-30
Author(s):  
Yunjiang Rao ◽  
Zinan Wang ◽  
Huijuan Wu ◽  
Zengling Ran ◽  
Bing Han
Keyword(s):  
Fiber Optics ◽  
Time Domain ◽  
Acoustic Waves ◽  
Rapid Development ◽  
Development Stage ◽  
Time Domain Reflectometry ◽  
Rayleigh Backscattering ◽  
Optical Time Domain Reflectometry ◽  
Phase Sensitive ◽  
Optical Time

AbstractPhase-sensitive optical time domain reflectometry (Ф-OTDR) is an effective way to detect vibrations and acoustic waves with high sensitivity, by interrogating coherent Rayleigh backscattering light in sensing fiber. In particular, fiber-optic distributed acoustic sensing (DAS) based on the Ф-OTDR with phase demodulation has been extensively studied and widely used in intrusion detection, borehole seismic acquisition, structure health monitoring, etc., in recent years, with superior advantages such as long sensing range, fast response speed, wide sensing bandwidth, low operation cost and long service lifetime. Significant advances in research and development (R&D) of Ф-OTDR have been made since 2014. In this review, we present a historical review of Ф-OTDR and then summarize the recent progress of Ф-OTDR in the Fiber Optics Research Center (FORC) at University of Electronic Science and Technology of China (UESTC), which is the first group to carry out R&D of Ф-OTDR and invent ultra-sensitive DAS (uDAS) seismometer in China which is elected as one of the ten most significant technology advances of PetroChina in 2019. It can be seen that the Ф-OTDR/DAS technology is currently under its rapid development stage and would reach its climax in the next 5 years.

Sign in / Sign up

Export Citation Format

Share Document