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• W1569667137 abstract "Optical fiber, a technology well-known to have revolutionized the telecommunication industry, is now becoming the key component behind the success of a number of enabling technologies such as sensing, biomedicine, defence, security and novel light sources. Along with standard telecommunication fibers, rare earth (RE) doped specialty optical fibers are the backbones of the photonics industry. Elements such as erbium (Er), ytterbium (Yb), yttrium (Y), neodymium (Nd), thulium (Tm) and europium (Eu) are vital optically active ingredients at the heart of many lasers, optical amplifiers and phosphors. Erbium-doped fiber amplifier (EDFA) — to overcome losses in long-distance optical communication links, fiber lasers — a technology having great potential for medical, defence and manufacturing sectors, Light Emitting Diode (LED) across the visible, ultraviolet and infrared wavelengths, potential for vast range of applications like traffic signals, instrumentation, communication, televisions, display etc. are just a few obvious examples. A range of optical fiber designs and materials are now being developed to meet the needs of both established and growing industries. Several research groups and industries around the world are developing the technology required to fabricate RE doped fibers with enhanced performance. In contrast to the standard telecommunication fibers, active fibers demand a greater variety of materials and structures in order to realize superior characteristics of amplification and lasing at a variety of operating wavelengths. Thus an optimized fabrication process needs to be established. Out of the various processes used for manufacturing optical fibers, the Modified Chemical Vapor Deposition (MCVD) process [Nagel et al. 1982, MacChesney, 2000] has been widely accepted for making specialty fibers because of better control over refractive index (RI) profile and superior process flexibility. In this process, the reactant gases (SiCl4, O2 and various dopant precursors) passing down a rotating silica tube is heated by an external oxyhydrogen burner that slowly traverses in the direction of input gas flow. The proportion of SiCl4 and the dopants is precisely controlled by controlling the amount of carrier gas (mostly oxygen) through the bubblers containing liquid halide precursors having reasonably high vapor pressure (~102 mm of Hg) over the temperature range of 20-30C. The reactant gases undergo high-temperature oxidation to form submicrometer range soot particles which get deposited downstream of the hot zone according to thermophoretic mechanism [Li, 1985]. The particulate layer is consolidated into thin pore free glassy film as the burner traverses over the deposited region. The desired RI profile is built up by repeating the above step with variation of vapor phase composition. Subsequent to completion of deposition, the tube is" @default.
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• W1569667137 date "2012-02-22" @default.
• W1569667137 modified "2023-09-26" @default.
• W1569667137 title "An Improved Method of Fabricating Rare Earth Doped Optical Fiber" @default.
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• W1569667137 doi "https://doi.org/10.5772/28734" @default.
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