Approach for reducing the Rayleigh scattering loss in optical fibers

2004 ◽  
Vol 95 (4) ◽  
pp. 1733-1735 ◽  
Author(s):  
K. Saito ◽  
M. Yamaguchi ◽  
A. J. Ikushima ◽  
K. Ohsono ◽  
Y. Kurosawa
Keyword(s):  
Optical Fibers ◽  
Rayleigh Scattering ◽  
Scattering Loss

Method for Predicting Rayleigh Scattering Loss of Silica-Based Optical Fibers

2007 ◽  
Vol 25 (8) ◽  
pp. 2122-2128 ◽  
Author(s):  
Kyozo Tsujikawa ◽  
Katsusuke Tajima ◽  
Kazuyuki Shiraki ◽  
Izumi Sankawa
Keyword(s):  
Optical Fibers ◽  
Rayleigh Scattering ◽  
Scattering Loss

Influence of a variable Rayleigh scattering-loss coefficient on the light backscattering in multimode optical fibers

2017 ◽  
Vol 56 (16) ◽  
pp. 4629 ◽  
Author(s):  
M. A. Bisyarin ◽  
O. I. Kotov ◽  
A. H. Hartog ◽  
L. B. Liokumovich ◽  
N. A. Ushakov
Keyword(s):  
Optical Fibers ◽  
Rayleigh Scattering ◽  
Loss Coefficient ◽  
Scattering Loss

scholarly journals Distributed Static and Dynamic Strain Measurements in Polymer Optical Fibers by Rayleigh Scattering

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5049
Author(s):  
Agnese Coscetta ◽  
Ester Catalano ◽  
Enis Cerri ◽  
Ricardo Oliveira ◽  
Lucia Bilro ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Time Domain ◽  
Rayleigh Scattering ◽  
Cost Effective ◽  
Time Domain Reflectometry ◽  
Dynamic Strain ◽  
Strain Measurements ◽  
Graded Index ◽  
Optical Time ◽  
Polymer Optical Fibers

We demonstrate the use of a graded-index perfluorinated optical fiber (GI-POF) for distributed static and dynamic strain measurements based on Rayleigh scattering. The system is based on an amplitude-based phase-sensitive Optical Time-Domain Reflectometry (ϕ-OTDR) configuration, operated at the unconventional wavelength of 850 nm. Static strain measurements have been carried out at a spatial resolution of 4 m and for a strain up to 3.5% by exploiting the increase of the backscatter Rayleigh coefficient consequent to the application of a tensile strain, while vibration/acoustic measurements have been demonstrated for a sampling frequency up to 833 Hz by exploiting the vibration-induced changes in the backscatter Rayleigh intensity time-domain traces arising from coherent interference within the pulse. The reported tests demonstrate that polymer optical fibers can be used for cost-effective multiparameter sensing.

Diode pumped visible Dy3+-doped silica fiber laser: Ge-co-doping effects on lasing efficiency and photodarkening

2021 ◽  
Author(s):  
Tomoya Okazaki ◽  
Chiaki Otsuka ◽  
Edson Haruhico Sekiya ◽  
Kota Kawai ◽  
Masato Mizusaki ◽  
...  
Keyword(s):  
Slope Efficiency ◽  
Rayleigh Scattering ◽  
Maximum Output Power ◽  
Silica Fiber ◽  
Maximum Output ◽  
Laser Oscillation ◽  
Scattering Loss ◽  
Co Doping ◽  
Doping Effects ◽  
Diode Pumped

Abstract We present the first demonstration of visible laser oscillation in the Dy3+-doped silica fiber pumped by a 451nm InGaN laser diode. It was found that Ge-co-doping plays the following important roles of laser oscillation: (1) to reduce the Rayleigh scattering loss, (2) to suppress the X-ray-induced and pump-induced photodarkening (PD), and (3) to increase lasing slope efficiency. In a fiber with 0.46wt% Dy, 1.8 wt% Ge, and 0.54wt% Al, the slope efficiency is 22.0 % at 582.5 nm, and the maximum output power is 18.4 mW.

scholarly journals Performance Analysis of Scattering-Level Multiplexing (SLMux) in Distributed Fiber-Optic Backscatter Reflectometry Physical Sensors

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2595 ◽  
Author(s):  
Daniele Tosi ◽  
Carlo Molardi ◽  
Wilfried Blanc ◽  
Tiago Paixão ◽  
Paulo Antunes ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Rayleigh Scattering ◽  
Fiber Optic ◽  
Single Fiber ◽  
Distributed Sensor ◽  
The Core ◽  
Physical Sensors ◽  
Core Section ◽  
Boundary Limits ◽  
Multiple Fibers

Optical backscatter reflectometry (OBR) is a method for the interrogation of Rayleigh scattering occurring in each section of an optical fiber, resulting in a single-fiber-distributed sensor with sub-millimeter spatial resolution. The use of high-scattering fibers, doped with MgO-based nanoparticles in the core section, provides a scattering increase which can overcome 40 dB. Using a configuration-labeled Scattering-Level Multiplexing (SLMux), we can arrange a network of high-scattering fibers to perform a simultaneous scan of multiple fiber sections, therefore extending the OBR method from a single fiber to multiple fibers. In this work, we analyze the performance and boundary limits of SLMux, drawing the limits of detection of N-channel SLMux, and evaluating the performance of scattering-enhancement methods in optical fibers.

scholarly journals Hollow core optical fibres with comparable attenuation to silica fibres between 600 and 1100 nm

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Hesham Sakr ◽  
Yong Chen ◽  
Gregory T. Jasion ◽  
Thomas D. Bradley ◽  
John R. Hayes ◽  
...  
Keyword(s):  
Rayleigh Scattering ◽  
Density Fluctuations ◽  
Power Delivery ◽  
Optical Data ◽  
Optical Fibres ◽  
Hollow Core ◽  
Quantum Communications ◽  
Scattering Loss ◽  
Air Core ◽  
Solid Glass

AbstractFor over 50 years, pure or doped silica glass optical fibres have been an unrivalled platform for the transmission of laser light and optical data at wavelengths from the visible to the near infra-red. Rayleigh scattering, arising from frozen-in density fluctuations in the glass, fundamentally limits the minimum attenuation of these fibres and hence restricts their application, especially at shorter wavelengths. Guiding light in hollow (air) core fibres offers a potential way to overcome this insurmountable attenuation limit set by the glass’s scattering, but requires reduction of all the other loss-inducing mechanisms. Here we report hollow core fibres, of nested antiresonant design, with losses comparable or lower than achievable in solid glass fibres around technologically relevant wavelengths of 660, 850, and 1060 nm. Their lower than Rayleigh scattering loss in an air-guiding structure offers the potential for advances in quantum communications, data transmission, and laser power delivery.

Absorption losses and thermal diffusivity of optical fibers investigated by photothermal methods: theory and experiments

1983 ◽  
Vol 61 (9) ◽  
pp. 1334-1346 ◽  
Author(s):  
Dominique Chardon ◽  
Serge J. Huard
Keyword(s):  
Thermal Diffusivity ◽  
Absorption Coefficient ◽  
Optical Fibers ◽  
Rayleigh Scattering ◽  
Modulation Frequency ◽  
Threshold Value ◽  
Phase Delay ◽  
Algebraic Expression ◽  
Photothermal Methods ◽  
Scattering Losses

Both the absorption coefficient and the thermal diffusivity of an optical fiber have been measured using photothermal methods: photoacoustics (P.A.) and photothermal deflection (P.D.). The amplitude of the photothermal signal is proportional to the heat density generated in the fiber core. This in turn is proportional to the light absorption coefficient β. Thus, these techniques allow one to separate the absorption and Rayleigh scattering losses. The results obtained by the two methods are in agreement. A threshold value of 10 dB km−1 mW has been determined experimentally. In both cases, the device is calibrated by replacing the fiber with a heated electric wire. Moreover, the heat must diffuse from the core to the gas so that when the light is modulated, a phase delay appears. A study of phase delay versus modulation frequency gives the thermal diffusivity of the fiber. This is required in order to improve fiber sensors.Theoretically, the cylindrical geometry of the sample permits simple calculations. The thermoelastic equations in solids and coupled thermodynamic ones in the gas have been solved without neglecting viscosity effects. Noting that silica is almost unexpansible, an algebraic expression of the signal has been obtained without any assumptions on the gas transformation processes. Finally, the P.A. and P.D. techniques are compared and some extensions are presented.

scholarly journals Rayleigh scattering in few-mode optical fibers

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Zhen Wang ◽  
Hao Wu ◽  
Xiaolong Hu ◽  
Ningbo Zhao ◽  
Qi Mo ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Rayleigh Scattering
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