Thermally induced microbending losses in double-coated optical fibers during temperature cycling

2000 ◽  
Vol 88 (7) ◽  
pp. 3840 ◽  
Author(s):  
Sham-Tsong Shiue ◽  
Chen-Sheng Hsu
Keyword(s):  
Optical Fibers ◽  
Temperature Cycling ◽  
Thermally Induced

Thermally induced optical effects in optical fibers by inverse methodology

2004 ◽  
Vol 95 (9) ◽  
pp. 5159-5165 ◽  
Author(s):  
Yu-Ching Yang ◽  
Shao-Shu Chu ◽  
Win-Jin Chang
Keyword(s):  
Optical Fibers ◽  
Thermally Induced ◽  
Optical Effects

Optical Fiber Shifts and Shear Stains in V-Groove Arrays for Optical MEMS Packaging

2005 ◽  
Vol 127 (1) ◽  
pp. 25-28 ◽  
Author(s):  
Z. W. Zhong ◽  
S. C. Lim ◽  
A. Asundi
Keyword(s):  
Optical Fiber ◽  
Thermal Loading ◽  
Optical Loss ◽  
Epoxy Adhesive ◽  
Temperature Cycling ◽  
Optical Mems ◽  
Element Analysis ◽  
Fiber Array ◽  
Thermally Induced ◽  
Mems Packaging

The objective of this study is to investigate optical fiber shifts and shear stains in V-groove arrays for optical microelectromechanical system packaging, when the arrays are subjected to temperature cycling. Thermally induced optical fiber shifts in the joints consisting of an optical fiber, epoxy adhesive, and silicon substrate were simulated using a finite element analysis (FEA) package ANSYS. Experiments using real-time Moire´ interferometry were also performed at temperatures of 25, 40, 60, 85 and 100°C for confirmation of the analysis results. The study revealed that thermally induced fiber shifts increased with the number of V-groove channels. The shear strains at the fiber and silicon interface in the fiber joints increased as the V-groove channel was further away from the neutral point of the fiber array packages. The optical coupling loss is the greatest during thermal loading for the outer fiber in the four channel V-groove array. Optical loss of 0.334 and 0.346 dB was calculated using the fiber shift values obtained from the FEA and experimental results, respectively. The effect of fiber shifts, especially the shift of the fiber that is positioned at the outermost V-groove in the array, cannot be ignored.

Effect of temperature cycling on the static fatigue of double-coated optical fibers

2004 ◽  
Vol 96 (5) ◽  
pp. 2494-2500 ◽  
Author(s):  
Sham-Tsong Shiue ◽  
Ting-Ying Shen ◽  
Kun-Ming Lin
Keyword(s):  
Optical Fibers ◽  
Temperature Cycling ◽  
Effect Of Temperature ◽  
Static Fatigue

Modeling of Advanced Melting Zone for Manufacturing of Optical Fibers*

2004 ◽  
Vol 126 (4) ◽  
pp. 750-759
Author(s):  
Zhiyong Wei ◽  
Kok-Meng Lee ◽  
Zhi Zhou ◽  
Siu-Ping Hong
Keyword(s):  
Temperature Distribution ◽  
Radiative Transfer ◽  
Optical Fibers ◽  
Feed Rate ◽  
Melting Zone ◽  
Transient Temperature ◽  
Drawing Process ◽  
Fiber Drawing ◽  
Thermally Induced ◽  
Transient Temperature Distribution

Optical fibers are drawn from preforms (fused silica glass rods) typically made up of two concentric cylinders (the core rod and the clad tube), which are usually joined in a separate fusion process. The setup time and hence manufacturing cost can be significantly reduced if the two cylinders can be joined in the same furnace in which the fiber is drawn. A good understanding of the transient temperature distribution is needed for controlling the feed rate to avoid thermally induced cracks. Since direct measurement of the temperature fields is often impossible, the geometrical design of the preform and the control of the feed rate have largely been accomplished by trials-and-errors. The ability to predict the transient temperature distribution and the thermally induced stresses will provide a rational basis to design optimization and feed rate control of the process. In this paper, we present an analytical model to predict the transient conductive-radiative transfer as two partially joined, concentric glass cylinders with specular surfaces are fed into the furnace. Finite volume method (FVM) is used to solve the radiative transfer equation (RTE). The specular surface reflectivity is obtained by the Fresnel’s law and the Snell’s law. The boundary intensities are obtained through the coupling of the interior glass radiative transfer and the exterior furnace enclosure analysis. The model has been used to numerically study the transient conductive-radiative transfer in the advanced melting zone (AMZ) of an optic fiber drawing process. This problem is of both theoretical and practical interest in the manufacture of optical fibers. The computational method for the radiation transfer developed in this paper can also be applied to the simulation of the fiber drawing process and other glass-related manufacturing processes.

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