Jet Assisted Aerosol Chemical Vapor Deposition for Optical Fiber Synthesis

Abstract

Various kinds of high quality optical bers are routinely fabricated by the modi ed chemical vapor deposition (MCVD), in which ne particles are generated through the oxidation of chemical precursor and deposited in a silica tube reactor. Ef ciency, rate, and uniformity of particle deposition determine the quality and cost of optical bers; therefore efforts to enhance aerosol deposition performance should be important for further improving both quality and cost. Here we propose a jet assisted aerosol chemical vapor deposition method utilizing gas jets in the conventional MCVD silica tube reactor for the purpose of enhancing the ef ciency, rate, and uniformity of particle deposition. High temperature helium gas is injected radially through an electrically heated thin tube inserted inside the silica tube. High temperature gas jets push particles generated in a tube toward the tube wall and therefore shorten the axial length of particle trajectories before deposition and cause particles to experience higher thermophoretic force. As a result, deposition ef ciency (and rate) was found to considerably increase compared to the conventional method, and the uniformity was also signi cantly improved.

Jet‐Assisted Aerosol CVD for Multicomponent Particle Deposition

“…The eight jet exit holes on the side of the inner tube were located 1.5 cm ahead of the torch. An additional jet exit hole was located on the front end of the inner tube to inject high temperature helium jet in the opposite direction to the main gas flow, which is effective to prevent particle deposition on the surface of the inner tube [15]. High temperature internal jets not only move SiO 2 /GeO 2 particles closer to the tube wall, but also ensure higher thermophoretic force near the tube wall, which could eventually lead to the improvement of uniformity and efficiency of multicomponent particle deposition.…”

“…For single component SiO 2 particle deposition, we not only achieved substantial increase in particle deposition efficiency, but also reduced the axially non-uniform deposition zone (tapered entry ) significantly. [15] In the present study, we apply the same method of jet-assisted aerosol CVD to the deposition of multicomponent SiO 2 /GeO 2 particles and investigate whether this method could improve the composition uniformity of dopant incorporation along the fiber preform length as well as overall particle deposition efficiency. Of particular interests are the effects of internal jet flow rates, jet temperatures, and various jet gases.…”

Spectroscopic Properties from Er3+/Yb3+ Co-doped Tellurite Glass and Fiber

“…Considering the shortage of the MCVD method [12] to the multi-component glasses [13], the fiber preform is fabricated by a new hot-jointing technique [13]. The content of the core glass is the same with glass sample NO.…”

“…On the other hand, for application, Er3+ doped tellurite fibers have recently been the focus of intensive research in ASE sources [4][5][6][7] as well as optical amplifiers [8,9]. In fact, an incoherent broadband optical source with low spectral ripples and high power intensity in ASE spectrum is required.…”