Novomoskovsk, Russia
Novomoskovsk, Russia

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Alekseev A.E.,RAS Institute of Radio Engineering and Electronics | Vdovenko V.S.,Petrofibre Ltd. | Gorshkov B.G.,RAS A.M. Prokhorov General Physics Institute | Potapov V.T.,RAS Institute of Radio Engineering and Electronics | Simikin D.E.,Petrofibre Ltd.
Laser Physics | Year: 2014

A novel configuration of a phase-sensitive optical time-domain reflectometer (OTDR) utilizing dual-pulse phase modulations of the probe signal is presented and experimentally demonstrated. The proposed modulation method enables one to perform the demodulation and reconstruction of an external perturbation signal which impacts the fiber using the phase diversity technique. The proposed phase-sensitive OTDR has some advantages in comparison with conventional solutions, which are discussed. The feasibility of a double pulse OTDR with phase modulation is demonstrated and theoretically proved. © 2014 Astro Ltd.


Alekseev A.E.,RAS Institute of Radio Engineering and Electronics | Vdovenko V.S.,Petrofibre Ltd. | Gorshkov B.G.,RAS A.M. Prokhorov General Physics Institute | Potapov V.T.,RAS Institute of Radio Engineering and Electronics | Simikin D.E.,Petrofibre Ltd.
Laser Physics | Year: 2015

In the present communication we propose a novel approach to the realization of a phase sensitive optical time-domain reflectometer (OTDR) which is capable of a precise reconstruction of the phase signal which impacts the arbitrary point of a fiber-optic line. The method uses a dual-pulse probe signal with diverse carrier optical frequency within each half of the double pulse. The quasi-periodic intensity pattern which emerges as a result of double frequency backscattered signal interference contains the information of the external action over the fiber. The phase signal is extracted with the aid of an I/Q quadrature demodulation scheme, realized at the receiving side of the OTDR. The feasibility and limitations of the proposed scheme are theoretically proved and experimentally demonstrated. © 2015 Astro Ltd.


Alekseev A.E.,RAS Institute of Radio Engineering and Electronics | Vdovenko V.S.,Petrofibre Ltd. | Gorshkov B.G.,RAS A.M. Prokhorov General Physics Institute | Potapov V.T.,RAS Institute of Radio Engineering and Electronics | Simikin D.E.,Petrofibre Ltd.
Journal of Communications Technology and Electronics | Year: 2016

The results of investigation of a new type of the optical-fiber coherent phase-sensitive reflectometer with two different optical frequencies of probing pulses are presented. The use of pulses with different optical frequencies allows recovering of the signal of an external action on the reflectometer optical fiber by means of phase diversity technique. The applicability of the proposed technique is justified theoretically and experimentally. © 2016, Pleiades Publishing, Inc.


Alekseev A.E.,RAS Institute of Radio Engineering and Electronics | Vdovenko V.S.,Petrofibre Ltd. | Gorshkov B.G.,RAS A.M. Prokhorov General Physics Institute | Potapov V.T.,RAS Institute of Radio Engineering and Electronics | Simikin D.E.,Petrofibre Ltd.
Laser Physics | Year: 2016

In the present paper we propose a novel method for optical time-domain reflectometer (OTDR)-reflectogram contrast enhancement via compensation of nonlinear distortions of propagating probe pulse, which arise due to the self-phase modulation (SPM) effect in optical fiber. The compensation is performed via preliminary frequency modulation (chirp) of the initial probe pulse according to the specific law. As a result the OTDR contrast at some distant predefined fiber point is fully restored to the value of non-distorted probe pulse at the beginning of the fiber line. As a result, the performance of the phase OTDR increases. The point of full SPM compensation could be shifted to any other point of the fiber line via preliminary frequency modulation index change. The feasibility of the proposed method is theoretically proved and experimentally demonstrated. © 2016 Astro Ltd.


Alekseev A.E.,RAS Institute of Radio Engineering and Electronics | Vdovenko V.S.,Petrofibre Company | Gorshkov B.G.,RAS A.M. Prokhorov General Physics Institute | Potapov V.T.,RAS Institute of Radio Engineering and Electronics | Simikin D.E.,Petrofibre Company
Technical Physics Letters | Year: 2015

Results of investigation of a phase-sensitive fiber-optic coherence reflectometer with amplitude-phase modulation of probing pulses are presented. Using this method of modulation, it is possible to reconstruct the signal of external impact upon the reflectometer fiber by means of the phase diversity technique. The applicability of the proposed method is theoretically justified and experimentally verified. © 2015, Pleiades Publishing, Ltd.


Alekseev A.E.,RAS Institute of Radio Engineering and Electronics | Vdovenko V.S.,Petrofibre Ltd. | Gorshkov B.G.,RAS A.M. Prokhorov General Physics Institute | Potapov V.T.,RAS Institute of Radio Engineering and Electronics | Simikin D.E.,Petrofibre Ltd.
Laser Physics | Year: 2016

In the present paper we propose a novel type of a coherent phase-sensitive optical time-domain reflectometer (OTDR) that utilizes a multimode optical fiber as a sensitive element and is capable of considerable reduction of signal fading. Elimination of OTDR signal fading consequently removes randomly occurring insensitivity of the fiber regions to an external phase action. The backscattered light field at the input of OTDR sensitive multimode optical fiber is represented by a speckle-like pattern, due to a so called modal noise phenomenon. This speckle pattern randomly changes when an optical probe pulse propagates in the fiber line. The backscattered field intensity in every single speckle changes in time statistically independently from the intensity change in every other speckle remote enough from the first one. Thus, on the output of a multimode sensitive fiber, there exist several statistically independent reflectograms, and every single reflectogram contains the same information about external action. The joint independent analysis of these reflectograms can result in reduced or complete fading elimination. © 2016 Astro Ltd.

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