Characterization of soot from multimode vapor-phase axial deposition (VAD) optical fiber performs

Nanoscale characterization of silica soots and aluminium solution doping in optical fibre fabrication

“…6). It was observed that soot layer structures appear to comprise small particles partially fused together to form chains, similar to behaviour seen in growth of fumed silica particles produced by methods other than MCVD [10]. It is not clear at what point in the process these chains are formed; whether the chains are created while the particles are still in the hot-zone immediately after generation, whether they are carried back into the hot region by vortices in the gas flow or whether they are partially sintered [11] to form chains by the burner traversing past them after deposition.…”

Germania nanocrystals in Modified Chemical Vapour Deposition

“…Recent studies of silica soot particles (SiO 2 ) in MCVD have found them to be invariably amorphous [7]. Several studies of the VAD process [8][9][10][11][12][13][14] have reported that under certain conditions some of the GeO 2 soot particles formed are crystalline. Crystalline GeO 2 has never been reported in MCVD.…”

Characterization of porous core layer for controlling rare earth incorporation in optical fiber

“…Unless the soot layer morphology is completely known and can be controlled with respect to the fabrication conditions, the fiber performance cannot be improved. Some data have been reported on the soot characteristics of a multimode soot boule prepared by VAD process [14] but no such result is available for soot layers deposited by MCVD process.…”