scholarly journals Automation calculation of the stability of drawing process of quartz optical fibers using different modifications of furnace shape

2019 ◽  
Vol 1353 ◽  
pp. 012095
Author(s):  
A L Derevyankina ◽  
V P Pervadchuk ◽  
D B Vladimirova
Keyword(s):  
Optical Fibers ◽  
Drawing Process ◽  
The Stability

Analytical simulations of the Fokas system; extension (2 + 1)-dimensional nonlinear Schrödinger equation

2021 ◽  
Author(s):  
Mostafa M. A. Khater
Keyword(s):  
Optical Fibers ◽  
Pulse Propagation ◽  
Dynamical Behavior ◽  
Nls Equation ◽  
Nonlinear Schrödinger ◽  
Contour Plots ◽  
System Extension ◽  
Inverse Spectral Method ◽  
Nonlinear Pulse Propagation ◽  
The Stability

This paper studies novel analytical solutions of the extended [Formula: see text]-dimensional nonlinear Schrödinger (NLS) equation which is also known with [Formula: see text]-dimensional complex Fokas ([Formula: see text]D–CF) system. Fokas derived this system in 1994 by using the inverse spectral method. This model is considered as an icon model for nonlinear pulse propagation in monomode optical fibers. Many novel computational solutions are constructed through two recent analytical schemes (Ansatz and Projective Riccati expansion (PRE) methods). These solutions are represented through sketches in 2D, 3D, and contour plots to demonstrate the dynamical behavior of pulse propagation in breather, rogue, periodic, lump, and solitary characteristics. The stability property of the obtained solutions is examined based on the Hamiltonian system’s properties. The obtained solutions are checked by putting them back into the original equation through Mathematica 12 software.

Effect of temperature regimes on the stability of the process of drawing optical fibers

1986 ◽  
Vol 27 (3) ◽  
pp. 417-423
Author(s):  
V. L. Kolpashchikov ◽  
Yu. I. Lanin ◽  
O. G. Martynenko ◽  
A. I. Shnip
Keyword(s):  
Optical Fibers ◽  
Effect Of Temperature ◽  
Temperature Regimes ◽  
The Stability

Possibility of expanding the stability domain of the fiber drawing process

1990 ◽  
Vol 59 (1) ◽  
pp. 828-835
Author(s):  
V. L. Kolpashchikov ◽  
Yu. I. Lanin ◽  
O. G. Martynenko ◽  
A. I. Shnip
Keyword(s):  
Stability Domain ◽  
Drawing Process ◽  
Fiber Drawing ◽  
The Stability

scholarly journals RESEARCH OF FOCL PARAMETERS IN THE RANGE OF POSITIVE TEMPERATURES

2021 ◽  
Keyword(s):  
Optical Fibers ◽  
Fiber Optic ◽  
Optical Parameters ◽  
Fiber Optic Cable ◽  
Temperature Range ◽  
Experimental Complex ◽  
Fiber Optic Communication ◽  
The Stability ◽  
Optic Communication ◽  
Communication Lines

This article studies the parameters of fiber-optic communication lines (FOCL) in the temperature range. For research, a climatic unit has been developed that allows a wide temperature range for testing (from -90°C to + 90°C) and an experimental complex for investigating the stability of optical parameters of a fiber-optic cable with temperature changes in the range from + 18°C to + 76°C. A technology of sequential switching of optical fibers of a fiber-optic cable by means of welding is proposed, thanks to which the constructive problem of placing a long optical fiber in a limited volume of a heat chamber is solved. Measurement of changes in the attenuation of fiber-optic communication lines with a monotonic change in positive temperatures in the direction of increasing and decreasing temperature.

Thermal behavior of optical fibers during the cooling stage of the drawing process

1991 ◽  
Vol 6 (1) ◽  
pp. 159-167 ◽  
Author(s):  
Haris Papamichael ◽  
Ioannis N. Miaoulis
Keyword(s):  
Thermal Behavior ◽  
Optical Fibers ◽  
Graphical Form ◽  
Temperature Profiles ◽  
Drawing Process ◽  
Two Dimensional ◽  
Cooling Stage ◽  
The Core ◽  
Radial Heat ◽  
General Method

A general method that predicts the thermal behavior of optical fibers during the cooling stage of the drawing process was developed. The method can be used for thin diameter D < 200 μm, medium (200 μm < D < 500 μm), and thick (0.5 mm < D < 2 mm) single as well as core-clad fibers. A two-dimensional analysis implementing a finite difference method combined with the Kármán–Pohlhausen technique was performed to obtain the temperature profiles in thick fibers. This method accounted for axial and radial heat conduction, and can also be applied to thin and medium fibers. The case of the core-clad fibers was investigated to obtain the temperature profiles both in the radial and the axial directions. All results are presented in graphical form and can be used for optimization of the drawing process.

Optical Spectra of Silica Core Optical Fibers Exposed to Hydrogen

1986 ◽  
Vol 88 ◽  
Author(s):  
P. J. Lemaire ◽  
M. D. Decoteau
Keyword(s):  
Optical Fibers ◽  
Rapid Growth ◽  
Oxygen Vacancies ◽  
Drawing Process ◽  
Fiber Core ◽  
Silica Core ◽  
Simultaneous Loss ◽  
Time Required ◽  
Induced Defects

ABSTRACTThe reaction of H2 with undoped silica core fibers was evaluated by means of “in situ” spectral loss measurements. Drawing induced loss peaks at 0.63 μm decreased rapidly upon exposure to hydrogen. Simultaneous loss increases at 1.39 and 1.53 μm suggest that H2 reacts at nonbridging oxygens and oxygen vacancies created during the drawing process, forming SiOH and SiH. The 1.53 μm SiH peak slowly decayed after its initially rapid growth, indicating that SiH is not thermodynamically stable in silica. The concentration of drawing induced defects is estimated to be on the order of 100 ppb, based on the time required for H2 to diffuse to the fiber core. The appearance of peaks at 1.45 μm suggests that HF is formed by reaction of H2 in the fluorine doped cladding of the fibers.

Fiber Optic Microneedles for Transdermal Light Delivery: Ex Vivo Porcine Skin Penetration Experiments

2010 ◽  
Vol 132 (9) ◽  
Author(s):  
Mehmet A. Kosoglu ◽  
Robert L. Hood ◽  
Ye Chen ◽  
Yong Xu ◽  
Marissa Nichole Rylander ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Fiber Optic ◽  
Ex Vivo ◽  
Skin Penetration ◽  
Average Diameter ◽  
Drawing Process ◽  
Pig Skin ◽  
In Vivo Diagnosis ◽  
Skin Samples

Shallow light penetration in tissue has been a technical barrier to the development of light-based methods for in vivo diagnosis and treatment of epithelial carcinomas. This problem can potentially be solved by utilizing minimally invasive probes to deliver light directly to target areas. To develop this solution, fiber optic microneedles capable of delivering light for either imaging or therapy were manufactured by tapering step-index silica-based optical fibers employing a melt-drawing process. Some of the microneedles were manufactured to have sharper tips by changing the heat source during the melt-drawing process. All of the microneedles were individually inserted into ex vivo pig skin samples to demonstrate the feasibility of their application in human tissues. The force on each microneedle was measured during insertion in order to determine the effects of sharper tips on the peak force and the steadiness of the increase in force. Skin penetration experiments showed that sharp fiber optic microneedles that are 3 mm long penetrate through 2 mm of ex vivo pig skin specimens. These sharp microneedles had a minimum average diameter of 73 μm and a maximum tip diameter of 8 μm. Flat microneedles, which had larger tip diameters, required a minimum average diameter of 125 μm in order to penetrate through pig skin samples. Force versus displacement plots showed that a sharp tip on a fiber optic microneedle decreased the skin’s resistance during insertion. Also, the force acting on a sharp microneedle increased more steadily compared with a microneedle with a flat tip. However, many of the sharp microneedles sustained damage during skin penetration. Two designs that did not accrue damage were identified and will provide a basis of more robust microneedles. Developing resilient microneedles with smaller diameters will lead to transformative, novel modes of transdermal imaging and treatment that are less invasive and less painful for the patient.

Theoretical Investigation of Metal Coating Deposition on Optical Fibers by Freezing Technique. The Model of the Process

1998 ◽  
Vol 531 ◽  
Author(s):  
A. S. Biriukov ◽  
V. A. Bogatyrjov ◽  
V. F. Lebedev ◽  
A. G. Khitun
Keyword(s):  
Thermal Stability ◽  
Melting Point ◽  
Optical Fibers ◽  
Liquid Metals ◽  
Fiber Surface ◽  
Metal Coating ◽  
Drawing Process ◽  
Coating Application ◽  
Metal Melting Point ◽  
Metal Melting

Metal-coated fibers are irreplaceable in a multiplicity of uses owing to high hermeticity of the coating and its chemical and thermal stability. At present, the most widespread technique for the metal coating application onto a fiber is a so-called freezing technique, which consists in pulling a silica fiber through a layer of a metal's melt directly in the fiber drawing process. If the fiber temperature is lower than the metal melting point, a certain amount of the melt is frozen on the fiber surface in the form of coating. For this to occur, it is necessary that the duration of the fiber-melt contact did not exceed the time during which the fiber heats up to the metal's melting point; otherwise, the frozen metal will melt again. Because silica glass is poorly wetted with a majority of liquid metals, the coating in the latter case is likely to become discontinuous.

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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