Shaping effects of the fiber-drawing on particle-rich silica optical fibers, numerical and experimental study

2020 ◽  
Author(s):  
Manuel Vermillac ◽  
Zhuorui Lu ◽  
Louis Douteau ◽  
Yahya Khoder ◽  
Nesrine Aïssa ◽  
...  
Keyword(s):  
Experimental Study ◽  
Optical Fibers ◽  
Fiber Drawing

Feasibility of High Speed Furnace Drawing of Optical Fibers

2004 ◽  
Vol 126 (5) ◽  
pp. 852-857 ◽  
Author(s):  
Xu Cheng ◽  
Yogesh Jaluria
Keyword(s):  
Optical Fibers ◽  
High Speed ◽  
Flow Instability ◽  
Fiber Quality ◽  
Domain Boundary ◽  
Operating Conditions ◽  
Furnace Temperature ◽  
Fiber Drawing ◽  
Heated Zone ◽  
Additional Information

The domain of operating conditions, in which the optical fiber-drawing process is successful, is an important consideration. Such a domain is mainly determined by the stresses acting on the fiber and by the stability of the process. This paper considers an electrical resistance furnace for fiber drawing and examines conditions for process feasibility. In actual practice, it is known that only certain ranges of furnace temperature and draw speed lead to successful fiber drawing. The results obtained here show that the length of the heated zone and the furnace temperature distribution are other important parameters that can be varied to obtain a feasible process. Physical behavior close to the boundary of the feasible domain is also studied. It is found that the iterative scheme for neck-down profile determination diverges rapidly when the draw temperature is lower than that at the acceptable domain boundary due to the lack of material flow. However, the divergence rate becomes much smaller as the temperature is brought close to the domain boundary. Additional information on the profile determination as one approaches the acceptable region is obtained. It is found that it is computationally expensive and time-consuming to locate the exact boundary of the feasible drawing domain. From the results obtained, along with practical considerations of material rupture, defect concentration, and flow instability, an optimum design of a fiber-drawing system can be obtained for the best fiber quality.

scholarly journals Comparative Experimental Study of a High-Temperature Raman-Based Distributed Optical Fiber Sensor with Different Special Fibers

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 574 ◽  
Author(s):  
Ismail Laarossi ◽  
María Quintela-Incera ◽  
José López-Higuera
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Optical Fiber Sensor ◽  
Time Domain Reflectometry ◽  
Fiber Sensor ◽  
Mechanical Resistance ◽  
Distributed Optical Fiber Sensor ◽  
Distributed Optical Fiber

An experimental study of a high temperature distributed optical fiber sensor based on Raman Optical-Time-Domain-Reflectometry (ROTDR) (up to 450 °C) and optical fibers with different coatings (polyimide/carbon, copper, aluminum and gold) is presented. Analysis of the distributed temperature sensor (DTS) measurements determined the most appropriate optical fiber to be used in high temperature industrial environment over long periods of time. To demonstrate the feasibility of this DTS for an industrial application, an optical cable was designed with the appropriate optical fiber and it was hermetically sealed to provide the required mechanical resistance and isolate the fiber from environmental degradations. This cable was used to measure temperature up to 360 °C of an industrial furnace during 7 days.

Numerical and experimental study of the influence of chromatic dispersion on cascaded Raman generation in optical fibers

2003 ◽  
Author(s):  
Frédérique Vanholsbeeck ◽  
Stéphane Coen ◽  
Catherine Martinelli ◽  
Philippe Emplit ◽  
Thibaut Sylvestre
Keyword(s):  
Experimental Study ◽  
Optical Fibers ◽  
Chromatic Dispersion

Analytic Study of Non-Newtonian Double Layer Coating Liquid Flows in Optical Fiber Manufacturing

2012 ◽  
Vol 224 ◽  
pp. 260-263 ◽  
Author(s):  
Kyoung Jin Kim ◽  
Ho Sang Kwak
Keyword(s):  
Optical Fiber ◽  
Glass Fiber ◽  
Double Layer ◽  
Optical Fibers ◽  
Newtonian Fluid ◽  
Liquid Flow ◽  
Analytic Study ◽  
Fiber Drawing ◽  
Drawing Speed ◽  
Layer Coating

In mass manufacturing of optical fibers, the wet-on-wet polymer resin coating is an efficient process for applying double layer coatings on the glass fiber. This paper presents an analytic study on the behavior of non-Newtonian polymer resins in the double layer coating liquid flow inside a secondary coating die of the optical fiber coating applicator. Based the approximations of fully developed laminar flow and the power law model of non-Newtonian fluid, the coating liquid flow of two immiscible resin layers is modeled for the simplified geometry of capillary annulus, where the surface of glass fiber moves at high fiber drawing speed. The effects of important parameters such as non-Newtonian fluid properties, the coating die size, and fiber drawing speed are investigated on the resin velocity profiles and secondary coating layer thickness.

Strength and Reliability of Metal-Coated Optical Fibers at High Temperatures

1998 ◽  
Vol 531 ◽  
Author(s):  
A. S. Biriukov ◽  
V. A. Bogatyrjov ◽  
V. F. Lebedev ◽  
A. A. Sysolyatin ◽  
A. G. Khitun
Keyword(s):  
Experimental Study ◽  
Melting Point ◽  
High Temperatures ◽  
Optical Fibers ◽  
Temperature Effects ◽  
Degradation Mechanism ◽  
Copper Coating ◽  
Mechanical Reliability ◽  
Optical Losses ◽  
Fiber Degradation

AbstractHermetically metal coated fibers are candidates for applications at high temperatures. To date, various metals with melting point up to 1400 °C have been used to coat fibers by the freezing technique. However, the major problems consist of ensuring mechanical reliability and acceptable optical losses in metal coated fibers at high temperatures. We present an experimental study of the temperature effects at 20 – 1050 °C on the performance of optical fibers with copper coating. Specific fiber degradation mechanism have been revealed

Free Drawing and Polymer Coating of Silica Glass Optical Fibers

1999 ◽  
Vol 121 (4) ◽  
pp. 774-788 ◽  
Author(s):  
U. C. Paek
Keyword(s):  
Optical Fibers ◽  
High Speed ◽  
Low Cost ◽  
High Volume ◽  
Commercial Application ◽  
Fiber Drawing ◽  
Drawing System ◽  
High Volume Production ◽  
Process Mechanics ◽  
Fiber Manufacturing

The paper is primarily to highlight the current issues concerning fiber drawing and coating. The main emphasis is on high-volume production of silica-based optical fibers by using a large preform and a high-speed drawing. The commercial application of these processes has led to increasing the productivity in fiber manufacturing and resulted in a low cost of produced fibers. In order to systematically address the problems associated with the fiber manufacturing process, the fiber drawing system was divided into three major functional sections: heating, cooling, and coating zones. The governing equations at each section were formulated to describe the process mechanics and to identify the key control parameters for drawing and coating. These process parameters are the basic elements of implementing a streamline production system of optical fibers.

Thermodynamic Properties and Optimized Fiber-Drawing Condition in Germanium Tellurite Glasses

2013 ◽  
Vol 275-277 ◽  
pp. 2002-2005
Author(s):  
Fang Fang Fu ◽  
Yu Lei ◽  
Jie Yang ◽  
Zhi Qiang Wang ◽  
Xin Zhao ◽  
...  
Keyword(s):  
Thermodynamic Properties ◽  
Optical Fibers ◽  
Coefficient Of Thermal Expansion ◽  
Softening Temperature ◽  
Optical Devices ◽  
Fiber Drawing ◽  
The Core ◽  
Onset Crystallization Temperature ◽  
Optical Fiber Drawing ◽  
Temperature Reference

Thermodynamic properties of the heavy metal germanium tellurite (NZPGT) core and cladding glasses have been investigated. Coefficient of thermal expansion (CTE) and softening temperature (Ts) of the Er3+⁄Yb3+ codoped NZPGT core glasses were identified to be 1.89×10–5 °C–1 and 343 °C, respectively. Glass transition temperature (Tg), onset crystallization temperature (Tx), peak temperature of crystallization (Tc), temperature difference value (ΔT) and thermal stability parameter (H) of the core glasses were solved to be 290 °C, 412 °C, 470 °C, 122 °C and 0.42, respectively, and the corresponding vaules of cladding glasses were derived to be 290 °C, 391 °C, 400 °C, 101 °C and 0.35. The investigation results indicate optical fiber drawing of Er3+⁄Yb3+ codoped medium-low phonon energy NZPGT glasses can be achieved in the temperature range 345—380 °C, which provides a valuable temperature reference for further high-quality optical fibers drawing in developing optical devices.

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