Silica glass has been used to fabricate SMFs or multimode fibers (MMFs) in the preform-drawing process. First, a preform is produced using MCVD technology, focusing on the deposition of core materials, e., silica doped with germanium, ytterbium, erbium, bismuth, and so forth. Germanium dopant is. Multimode fibers are optical fibers which support multiple transverse guided modes for a given optical frequency and polarization. In most cases, that number of guided modes is large, e. Multimode fiber typically operates at a wavelength of 850 nm as it allows. At the Core As you know, there are two main types of optical fiber: single-mode and multimode. Single-mode fiber. High bandwidth demanding applications such as high-performance computing and hyperscale datacenters are drivers for co-packaged optics, which aims to bring optical signals as close as possible to the electrical computing chips by integrating the electro-optic transceivers and ASICs on the same. Basically, fiber manufacturers use two methods to fabricate multimode and single mode glass fibers. In vapor phase oxidation, gaseous metal halide compounds, dopant material, and oxygen are oxidized (burned) to form a.