Recent developments in vapor phase axial deposition

Evaluation of Silica Nanofluids in Static and Dynamic Conditions by an Optical Fiber Sensor

“…Silica nanoparticles were synthesized by the Vapor-phase Axial Deposition (VAD) method [26], in which a high-temperature O 2 -H 2 flame promotes the hydrolysis and oxidation of the SiCl 4 precursor according to the reaction:…”

“…The VAD system is designed for the fabrication of completely amorphous silica glass of high transparency, destined for the production of optical fiber preforms and other photonic components [26,27]. Therefore, due to the high purity and morphological control of the silica, and to the wide availability of characterization data of these particles [12,27,28], the use of the in-situ synthesized nanoparticles was preferred over commercially available materials.…”

10.1007/s10789-008-3012-4

“…At the same time, Davey et al [1] assumed that the additional losses in heavily doped MCVD SMFs are due to the dip in RIP. Given that the median value of optical losses in standard single-mode telecommunication fibers mass-produced by axial deposition, which rules out the formation of a central index dip, is somewhat lower than that in their MCVD analogs [25,26] and that GeO 2 -rich fibers with the lowest losses were produced by VAD, it is reasonable to assume that the effect in question is significant.…”

Processo automatizado de fabricação de preformas aplicado a fibras opticas mantenedoras de polarização para sensores fotonicos

“…Nota-se que, para esta configuração, é necessário efetuar etapas adicionais de overcladding para produzir uma preforma completa com núcleo e casca. Entretanto, existem sistemas onde a deposição da casca é realizada simultaneamente com o núcleo, através da utilização de mais de um maçarico (Murata 1986). Ao contrário do que ocorre nos métodos MCVD e OVD, no VAD as dimensões da preforma não são limitadas pela geometria do alvo inicial, o que permite produzir preformas com comprimento e diâmetro grandes, além de preservar o controle e homogeneidade das propriedades ópticas requeridas em vidros de alta qualidade.…”