arXiv subjects

K. V. Stepanov

Publications and source records attributed to K. V. Stepanov.

3 recordsLinked to original sources

arXiv2020

Influence of the laser frequency drift in phase-sensitive optical time-domain reflectometry

The 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.

physics.ins-det↗

arXiv2018

Phase-sensitive optical time-domain reflectometry with pulse mode EDFA: Probe pulse preparation

Probe pulse preparation techniques play an important role for fiber-optic sensing. In this work, we investigate a setup for distributed sensors based on phase-sensitive optical time domain reflectometry ($Φ$-OTDR) with the use of an erbium doped fibre amplifier (EDFA). In our $Φ$-OTDR setup with pulse mode EDFA, we reveal a regime providing us both sufficiently large amplification of the probe pulse power together and adequately small probe pulse distortion. We then show that the use of pulse mode EDFA is a cost-effective solution, which allows one to avoid nonlinear effect and ensure sufficient sensitivity of the setup.

physics.ins-det↗

arXiv2017

Minimization of errors in narrowband laser phase noise measurements based on reference measurement channels

We propose a novel scheme for laser phase noise measurements with minimized sensitivity to external fluctuations including interferometer vibration, temperature instability, other low-frequency noise, and relative intensity noise. In order to minimize the effect of these external fluctuations, we employ simultaneous measurement of two spectrally separated channels in the scheme. We present an algorithm for selection of the desired signal to extract the phase noise. Experimental results demonstrate potential of the suggested scheme for a wide range of technological applications.

physics.ins-det↗