Results 131 to 140 of about 1,583 (160)

Real-Time Optical Frequency-Domain Reflectometry

2007 Conference on Lasers and Electro-Optics (CLEO), 2007
In this paper, we propose and demonstrate an ultrafast optical frequency domain reflectometry system based on real-time optical Fourier-transformation. Interferograms are captured over 50 ns time windows at a 20 MHz repetition rate with a 70 mum depth resolution.
Y. Park, T. -J. Ahn, J.-C. Kieffer, J. Azana   +3 more
openaire   +1 more source

High resolution optical frequency domain reflectometry for characterization of components and assemblies

Optics Express, 2005
We describe a technique for polarization sensitive optical frequency domain reflectometry (OFDR) that achieves 22 micrometer two-point spatial resolution over 35 meters of optical length with -97 dB sensitivity in a single measurement taking only seconds.
Dawn K Gifford, Mark E Froggatt, Mark Froggatt   +2 more
exaly   +3 more sources

Phase-Noise-Compensated Optical Frequency-Domain Reflectometry

IEEE Journal of Quantum Electronics, 2009
The theory of phase-noise-compensated optical frequency-domain reflectometry (PNC-OFDR), a novel type of optical frequency-domain reflectometry (OFDR) with a measurement range much longer than the laser coherence length, is described, and the signal and noise spectral densities are deduced for a discussion of signal-to-noise ratio (SNR).
Xinyu Fan, Yusuke Koshikiya, Fumihiko Itô   +2 more
exaly   +2 more sources

Time-domain slicing optical frequency domain reflectometry

Optics Letters
A time-domain slicing (TDS) optical frequency domain reflectometry is proposed for large strain sensing with better spatial resolution. Compared with the conventional frequency domain slicing (FDS) method, the TDS with a Burg spectrum estimation is capable of enhancing the similarity of a local spectrum under large strain and mostly suppressing the ...
Qing, Bai, Zhen, Shen, Luxuan, Wu, Changshuo, Liang, Yu, Wang, Xin, Liu, Baoquan, Jin   +6 more
openaire   +2 more sources

Polarization effects in coherent optical frequency-domain reflectometry

IEEE Photonics Technology Letters, 1996
Polarization effects in coherent optical frequency domain reflectometry were evaluated. The use of a polarization average procedure completely eliminated these effects, giving rise to a measurement accuracy of 0.27 dB for an arbitrary polarization vector of the detected signal, without making use of polarization diversity receivers, which are not ...
G. Mussi, P. Stamp, N. Gisin, R. Passy, J.P. von der Weid   +4 more
openaire   +1 more source

Fault location in optical fibers using optical frequency domain reflectometry

Journal of Lightwave Technology, 1986
This paper describes the experimental and analytical investigations performed on another backscattering technique named "Optical Frequency Domain Reflectometry" (OFDR). In this approach the temporal signatures of graded-index multimode fibers are obtained as the inverse Fourier transform of the OFDR data.
T Okoshi
exaly   +2 more sources

Distributed Optical Fiber-Based Dosimetry With Optical Frequency Domain Reflectometry

IEEE Sensors Journal
International ...
Perrot, J., Morana, A., Marin, E., Boukenter, A., Ouerdane, Y., Bertrand, J., Boiron, H., Girard, S.   +7 more
openaire   +2 more sources

Magnetic Optical FBG Sensors Using Optical Frequency-Domain Reflectometry

IEEE Transactions on Magnetics, 2019
The optical frequency-domain reflectometry (OFDR) sensing system and signal processing method, which is based on the short-time Fourier transform, enable us to interrogate reflected wavelengths of fiber Bragg gratings (FBGs) and their relative position along the optical fiber with high spatial resolution.
Norbert Kaplan, Jozef Jasenek, Jozefa Cervenova, Mariana Usakova   +3 more
openaire   +1 more source

High-resolution optical frequency domain reflectometry

Optical Fiber Communication, 1991
Optical time-domain reflectometry (OTDR) is a widespread and commercially successful technique for performing several types of measurements on fiber-optic networks and components. An alternative method, also in widespread use, is optical frequency-domain reflectometry (OFDR).
openaire   +1 more source

Coherent optical frequency domain reflectometry for a 1000-km optical fiber

OFC '98. Optical Fiber Communication Conference and Exhibit. Technical Digest. Conference Edition. 1998 OSA Technical Digest Series Vol.2 (IEEE Cat. No.98CH36177), 2002
Summary form only given. We demonstrated coherent optical frequency domain reflectometry (C-OFDR) for a long optical fiber transmission line. We simulated the measurement of a reflection at a one-way distance of >1000 km, and achieved a spatial resolution of about 130 m.
K. Tsuji, T. Horiguchi, Y. Koyamada
openaire   +1 more source