Results 141 to 150 of about 1,664 (168)

Observation of a Random Fiber Laser Induced by Rayleigh Backscattering

2014 International Semiconductor Laser Conference, 2014
We present several observations of a random fiber lasing effect induced by Rayleigh backscattering only. A reflective semiconductor optical amplifier re-amplifies the non-coherent light fed back by 25km of SMF acting as a scattered mirror.
G. Simon, F. Saliou, P. Chanclou, R. Brenot, A. Maho, S. Barbet, D. Erasme, F. Grillot   +7 more
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Optical fiber identification using Rayleigh backscattered light

IEEE Photonics Technology Letters, 1992
The remote identification of fibers from an office is a key technology for automatically updating the wiring database of an optical fiber network. This work proposes a new fiber identification method that uses the spatial dependency of the power of Rayleigh backscattered light.
T. Kuwabara, H. Koga, Y. Kato, Y. Mistunaga   +3 more
openaire   +1 more source

Effect Of Phase Modulation On Coherent Rayleigh Backscatter Noise

SPIE Proceedings, 1987
This paper presents the results of a series of experiments performed on a fibre optic gyroscope to determine the effect of different phase modulation frequencies and modulation depths on coherent backscatter noise. The results suggest that coherent backscatter is modulated in quadrature with the Sagnac signal although a presently unexplained noise ...
J. M. Mackintosh, J. L. McMillan, B. Culshaw   +2 more
openaire   +1 more source

Identification of sensors in optical fiber networks with Rayleigh backscattering

SPIE Proceedings, 2017
This paper presents a new method of identifying an optical sensor like Fiber Bragg Grating1,2 (FBG) temperature sensors. The identifier is a pattern inscribed into the core of an optical fiber by a femtosecond laser. A Rayleigh backscattering interrogator is used to readout the identifier.
T. Ringel, T. Bosselmann
openaire   +1 more source

Rayleigh Backscattering In Optical Passive Ring-Resonator Gyro

SPIE Proceedings, 1984
The Rayleigh backscattering in Optical Passive Ring-Resonator Gyro (OPRG) is newly formulated in consideration of the temporal coherence of the optical source. This scattering degrades the gyro linearity due to its resonance peak splitting under the rotation.
K. Iwatsuki, K. Hotate, M. Higashiguchi
openaire   +1 more source

Effect of thermal aging on Rayleigh backscattering in an optical fiber

Optical Engineering, 2009
We investigate the effect of thermal aging on the optical properties of multimode silica fibers. Samples were submitted to several heating-cooling cycles of 8 h each. Analyses were performed using an optical spectrum analyzer and an optical time-domain reflectometer to determine the signal loss.
Ch'Hayder, A., Tarrach, F., Guermazi, S., Ducournau, Guillaume, Ketata, M.   +4 more
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Limitation of rotation sensing in IORG by Rayleigh backscattering noise

EPL (Europhysics Letters), 2011
Rayleigh backscattering noise (RBN) in integrated optical resonance gyroscope (IORG) is theoretically and experimentally researched. The SiO2 waveguide resonator performance degradation of IORG due to RBN is analyzed firstly, and then the nonlinear output of IORG caused by RBN is simulated.
H. Yu, C. Zhang, L. Feng, L. Hong, M. Lei   +4 more
openaire   +1 more source

Calculation of Rayleigh backscattering noise in fiber-optic gyroscopes

Journal of the Optical Society of America A, 1985
Rayleigh backscattering noise in fiber-optic gyroscopes is calculated by taking into account the Rayleigh backscattered wave phases. The property of a low-coherence light wave is introduced by means of the analytic signal of the light source. The noise-equivalent rotation rate of Rayleigh backscattering is shown to be a factor of 2|1−2K| smaller than ...
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Rayleigh backscattering theory for single-mode optical fibers

Journal of the Optical Society of America, 1983
The theory of backscattering in single-mode optical fibers is described through use of a correlation function for the refractive-index fluctuation in the fiber. A simple formula for the backscattered power is derived using two correlation functions for the Booker–Gordon and Gaussian models.
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Non-Rayleigh statistics of ultrasonic backscattered echoes

Till recently, many of the tissue characterization models have been based on the Rayleigh distribution. However, there have been many instances cited in literature suggesting that deviations from Rayleigh statistics occur when the region of interest contains fewer number of scatterers, exhibits significant variations in scattering cross-section, or ...
openaire   +1 more source