Influence of the temperature changes on the field distribution of the optical fiber above the normalized frequency critical value

2003 ◽  
Author(s):  
Vladimir Vasinek
Keyword(s):  
Optical Fiber ◽  
Field Distribution ◽  
Critical Value ◽  
Temperature Changes ◽  
Normalized Frequency

Heat Transfer in Chemical Vapor Deposited Optical Fiber Coatings

2001 ◽  
Author(s):  
Patricia O. Iwanik ◽  
Wilson K. S. Chiu
Keyword(s):  
Heat Transfer ◽  
Optical Fiber ◽  
Gas Flow ◽  
Convection Heat Transfer ◽  
Fiber Surface ◽  
Chemical Vapor ◽  
Temperature Changes ◽  
Flow And Heat Transfer ◽  
Chemical Vapor Deposited ◽  
Fiber Coatings

Abstract A fundamental understanding of how reactor parameters influence the fiber surface temperature is essential to manufacturing high quality optical fiber coatings by chemical vapor deposition (CVD). In an attempt to better understand this process, a finite volume model has been developed to study the gas flow and heat transfer of an optical fiber as it travels through a CVD reactor. This study showed that draw speed significantly affects fiber temperature inside the reactor, with temperature changes up to 45% observed under the conditions studied. Multiple heat transfer modes contribute to this phenomena, with convection heat transfer dominating the process.

scholarly journals Thermo-Optical Switching Effect Based on a Tapered Optical Fiber and Higher Alkanes Doped with ZnS:Mn

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5044
Author(s):  
Joanna E. Moś ◽  
Karol A. Stasiewicz ◽  
Katarzyna Matras-Postołek ◽  
Leszek R. Jaroszewicz
Keyword(s):  
Optical Fiber ◽  
Phase Change ◽  
Optical Switching ◽  
Power Transmission ◽  
Phase Changes ◽  
Temperature Threshold ◽  
Power Switching ◽  
Temperature Changes ◽  
Tapered Optical Fiber ◽  
The Difference

The paper investigates the effect of thermo-optic switching resulting from the hybrid combination of a tapered optical fiber (TOF) with alkanes doped with nanoparticles of zinc sulfide doped with manganese (ZnS:Mn NP). Presented measurements focused on controlling losses in an optical fiber by modification of a TOF cladding by the alkanes used, characterized by phase change. Temperature changes cause power transmission changes creating a switcher or a sensor working in an ON-OFF mode. Phase change temperatures and changes in the refractive index of the alkane used directly affected power switching. Alkanes were doped with ZnS:Mn NPs to change the hysteresis observed between ON-OFF modes in pure alkanes. The addition of nanoparticles (NPs) reduces the difference between phase changes due to improved thermal conductivity and introduces extra nucleating agents. Results are presented in the wide optical range of 550–1200 nm. In this investigation, hexadecane and heptadecane were a new cladding for TOF. The higher alkanes were doped with ZnS: Mn NPs in an alkane volume of 1 wt.% and 5 wt.%. The thermo-optic effect can be applied to manufacture a thermo-optic switcher or a temperature threshold sensor.

Spatial Resolution Improvement of Distributed Optical Fiber Raman Temperature Sensor System by Using Amplitude Modification Algorithm

2013 ◽  
Vol 552 ◽  
pp. 393-397
Author(s):  
Zhong Xie Jin ◽  
Hai Peng Zhu
Keyword(s):  
Optical Fiber ◽  
Spatial Resolution ◽  
Temperature Sensor ◽  
High Spatial Resolution ◽  
Sensor System ◽  
Fiber Axis ◽  
Temperature Changes ◽  
Amplitude Coefficient ◽  
Resolution Improvement ◽  
Distributed Optical Fiber

Spatial resolution is an important parameter in distributed optical fiber Raman temperature sensor system (DOFRTS). In this paper, a 10 kilometers long DOFRTS with spatial resolution of about 6 meters is constructed. The spatial resolution is limited by electrical bandwidth of the photodetector circuit and the data acquisition part. The abrupt temperature changes along the fiber axis are treated as temporal pulse signals, and a linear amplitude coefficient modification algorithm is used to improve the spatial resolution. The experimental results show that the temperature amplitudes from 3 meters region to 6 meters can be modified accurately. Therefore, a DOFRTS of high spatial resolution but low system cost could be successfully constructed.

EFFECT OF DYNAMIC STRESSES ON THE DURABILITY OF QUARTZ OPTICAL FIBERS IN OPTOELECTRONIC MEASUREMENT DEVICES

2019 ◽  
pp. 28-36
Author(s):  
A. V. Polyakov
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Life Time ◽  
Linear Expansion Coefficient ◽  
Measured Temperature ◽  
Dynamic Stresses ◽  
Fiber Sensors ◽  
Temperature Changes ◽  
Measurement Devices ◽  
Optoelectronic Measurement

The method of a theoretical estimation of optical fiber durability used in optical fiber sensors as a sensitive element, depending on the nonstationary longitudinal strain arising at dynamic temperature changes is offered. The developed analytical model takes into account design features of a fiber (diameters of a core and cladding, a metal or polymeric covering), doping types, relative humidity of an environment, as well as the temperature dependence of the activation energy and the Young's modulus of the optical fiber, the linear expansion coefficient of the metallic coating. Numerical modeling of optical fiber service life time at dynamic influences of measured temperature and comparison with experimental data is carried out.

Comparison of optical fiber tip temperature changes induced by various LED curing units

2014 ◽  
Vol 67 (3) ◽  
pp. 304-319
Author(s):  
Ryta Łagocka ◽  
Maja Bendyk-Szeffer ◽  
Katarzyna Jakubowska ◽  
Jadwiga Buczkowska-Radlińska
Keyword(s):  
Optical Fiber ◽  
Temperature Changes

Fracture Probability Analysis of Crack Occurrence on a Floating Roof due to Thermal Stress

2012 ◽  
Vol 622-623 ◽  
pp. 1539-1544
Author(s):  
Yoshihiro Hirokawa ◽  
Haruki Nishi ◽  
Minoru Yamada ◽  
Shinsaku Zama ◽  
Ken Hatayama
Keyword(s):  
Thermal Stress ◽  
Optical Fiber ◽  
Crude Oil ◽  
Fracture Probability ◽  
Probability Analysis ◽  
Oil Refinery ◽  
Temperature Changes ◽  
Southern Japan ◽  
Oil Tank

Several cracks were found on some actual floating roofs of a crude oil tank in the oil refinery located in southern Japan. We assumed that one of reasons would be due to thermal stress caused by temperature changes during the day. In order to consider whether the thermal stress could the cause damages on the floating roof, strain and temperature were measured on the actual floating roof by using optical fiber gauges. Furthermore, fracture possibility due to thermal stress was calculated to discuss whether thermal stress could cause fracture or not. As a result, the probability showed that thermal stresswasnot enough to cause fracture. Anotherexternal factor such as Typhoon could be related.

Modeling of few-mode multi-core optical fiber channel based on non-uniform mode field distribution

2016 ◽  
Vol 13 (8) ◽  
pp. 184-191
Author(s):  
Hang Zhou ◽  
Bo Liu ◽  
Fu Wang ◽  
Dandan Song ◽  
Li Li ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Field Distribution ◽  
Mode Field ◽  
Fiber Channel
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