Characteristics analysis of coating layer power distribution of eccentric core optical fiber

2012 ◽  
Author(s):  
Jianxia Liu ◽  
Hongchang Deng ◽  
Libo Yuan
Keyword(s):  
Optical Fiber ◽  
Power Distribution ◽  
Coating Layer ◽  
Characteristics Analysis

scholarly journals Tests under irradiation of optical fibers and cables devoted to corium monitoring in case of severe accident in a Nuclear Power Plant

2020 ◽  
Vol 225 ◽  
pp. 08006
Author(s):  
G. Cheymol ◽  
L. Maurin ◽  
L. Remy ◽  
V. Arounassalame ◽  
H. Maskrot ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Nuclear Power ◽  
Carbon Coating ◽  
Hydrogen Diffusion ◽  
Coating Layer ◽  
Distributed Sensing ◽  
Severe Accident ◽  
Normal Operation ◽  
The Status

The DISCOMS project, which stands for “DIstributed Sensing for COrium Monitoring and Safety”, considers the potential of distributed sensing technologies, based on remote instrumentations and Optical Fiber Sensing cables embedded into the concrete floor under the reactor vessel, to monitor the status of this third barrier of confinement. This paper focuses on the selection and testing of singlemode (SM) optical fibers with limited RIA (Radiation Induced Attenuation) to be compliant with remote distributed instruments optical budgets, the ionizing radiation doses to sustain, and their reduction provided by the concrete basemat shielding. The tests aimed at exposing these fibers and the corresponding sensitive optical cables, to the irradiation doses expected during the normal operation of the reactor (up to 60 years for the European Pressurized Reactor), followed by a severe accident. Several gamma and mixed (neutron-gamma) irradiations were performed at CEA Saclay facilities: POSÉÏDON irradiator and ISIS reactor, up to a gamma cumulated dose of about 2 MGy and fast neutron fluence (E > 1 MeV) of 6 x 1015 n/cm2. The first gamma test permitted to assess the RIA at various optical wavelengths, and to select three radiation tolerant singlemode fibers (RIA < 5 dB/100 m, at 1550 nm operating wavelength). The second one was performed on voluminous strands of sensitive cables encapsulating the selected optical fibers, up to approximately the same accumulated dose, at two temperatures: 30°C and 80°C. A significant increase of the RIA, without any saturation tendency, appeared for fibers inserted into cables, correlated with the increase of the hydroxyl attenuation peak at 1380 nm. Molecular hydrogen generated by the radiolysis of compounds of the cable is at the origin of this phenomenon. A third gamma irradiation run permitted to measure the radiolytic hydrogen production yield of some compounds of a dedicated temperature cable sample. The efficiency of a carbon coating layer over the silica cladding, acting as a barrier against hydrogen diffusion, was also successfully confirmed. Finally, the efficiency of this carbon coating layer has also been tested under neutron irradiation, then qualified as a protection barrier against hydrogen diffusion in the optical fiber cores.

Modelization of field power distribution in specific singlemode optical fiber for optimal coupling in P-I-N photodiode

1994 ◽  
Author(s):  
Mohamed Ketata ◽  
Olivier Latry ◽  
B. Collette ◽  
V. De Pauw ◽  
K. Ketata ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Power Distribution ◽  
Optimal Coupling

Optimization of Fiber-Optic Evanescent Wave Spectroscopy: A Monte Carlo Approach

2009 ◽  
Vol 63 (9) ◽  
pp. 1057-1061 ◽  
Author(s):  
M. P. Mann ◽  
S. Mark ◽  
Y. Raichlin ◽  
A. Katzir ◽  
S. Mordechai
Keyword(s):  
Monte Carlo ◽  
Optical Fiber ◽  
Electromagnetic Radiation ◽  
Monte Carlo Methods ◽  
Power Distribution ◽  
Infrared Radiation ◽  
Evanescent Wave ◽  
Fiber Optic ◽  
Evanescent Waves ◽  
Complex Geometries

The absorbance of the evanescent waves of infrared radiation transmitted through an optical fiber depends on the geometry of the fiber in addition to the wavelength of the electromagnetic radiation. The signal can thus be enhanced by flattening the midsection of the fiber. While the dependence of the absorbance on the thickness of the midsection has already been studied and experimented upon, we demonstrate that similar results are obtained using Monte Carlo methods based simply on geometrical optics, given the dimensions of the fiber and the power distribution of the fired rays. The optimization can be extended to fibers with more complex geometries of the sensor.

4 × 4 Plastic Optical Fiber Star Coupler Incorporated with a Common Polymer Waveguide Optical Power Distribution Region

2011 ◽  
Vol 30 (4) ◽  
pp. 265-277 ◽  
Author(s):  
Kwang Taek Kim ◽  
Boo Jeon Han ◽  
Min Kuk Kim ◽  
Young Ho Kim ◽  
Byeong Ha Lee ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Power Distribution ◽  
Optical Power ◽  
Plastic Optical Fiber ◽  
Polymer Waveguide

Optical fiber current sensors using garnet crystal for power distribution fields

1997 ◽  
Vol 4 (1) ◽  
pp. A45-A49 ◽  
Author(s):  
Satoshi Ishizuka ◽  
Nobuki Itoh ◽  
Hisashi Minemoto
Keyword(s):  
Optical Fiber ◽  
Power Distribution ◽  
Garnet Crystal ◽  
Current Sensors

Loss Characteristics Analysis and Optimization of an Off-Axis Rotary Optical Fiber Communication System

2014 ◽  
Vol 596 ◽  
pp. 788-793 ◽  
Author(s):  
Xiao Hua Wang ◽  
Qian Zhao ◽  
Li Li ◽  
Jie Ding ◽  
Qiu Xin Zheng ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Communication System ◽  
High Speed ◽  
Optical Fiber Communication ◽  
Fiber Communication ◽  
Experiment Platform ◽  
Optical Fiber Communication System ◽  
Characteristics Analysis ◽  
Fiber Collimator ◽  
The Stability

The losses of the off-axis rotary optical fiber communication system were derived from optical fiber coupling, three kinds of misalignments between optical fiber collimators (Axial separation Z0, lateral offset X0, angular tilting θ), incomplete alignment of optical fiber collimator during rotation and system tremble caused by high speed rotating. Some measures were taken to reduce the loss. The thermally expanded core fiber collimator cut down the influence of axial separation and angular tilting. The position of the optical fiber collimator on the flange was adjusted and infrared right angle prisms were installed to reduce the losses during rotation of the system. In addition, improving the precision and optimizing device of mechanical structure can increase the stability of the whole experiment platform and decrease the losses.

Characteristics analysis of metamaterial based optical fiber

Optik ◽  
2016 ◽  
Vol 127 (20) ◽  
pp. 9377-9385 ◽  
Author(s):  
Yamunadevi R. ◽  
Shanmuga sundar D. ◽  
Sivanantha Raja A.
Keyword(s):  
Optical Fiber ◽  
Characteristics Analysis
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