Abstract
Vapor-phase axial deposition (VAD) was developed in 1977 to achieve mass production of high silica fibers.1 A key feature that distinguishes this process from MCVD and OVPO is the continuous fabrication of the fiber preform in the axial direction. A porous preform is grown by deposition of fine glass particles synthesized with vapor-phase reaction of raw materials and is successively consolidated into a transparent preform by zone melting. Such a simple process has the advantage of tong large-diameter preform fabrication.
© 1981 Optical Society of America
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