Optical fibers form the basis of modern telecommunications by their extraordinary abilities of manipulating photons over a long distance. On the other hand, semiconductor-based optoelectronic devices, such as lasers, amplifiers, and detectors, are the key elements to generate, reshape, and capture photons. Conversion from photons to electrons is needed in order to demodulate the optical signal. However, conversion between optical and electronic signals not only increases the complexity of the overall system, but also seriously degrades the transmission speed and increases the total loss. Although silicon-waveguide-based optoelectronic devices have been realized, such as a Raman waveguide laser in the near-infrared (NIR) region1 and an image amplifier in the medium-wave-infrared (MWIR) region,2 it is desirable to avoid such conversions and maintain the photons within the fiber. Silicon-based all-fiber optoelectronic devices are highly desired for the future telecommunication networks. In addition, regular optical fibers are made of fused silica with some special dopants in the core, such as germanium. They cut off at a wavelength of . In comparison, silicon allows low-loss optical transmission to the MWIR region . Particularly, most chemical and biological agents have stronger and more unique signature absorptions in the MWIR region as compared to the NIR region, which can make silicon optical fibers ideal sensing devices. Silicon core optical fibers have been fabricated using high-pressure microfluidic chemical deposition technology.3 However, this technology experiences difficulties in order to fabricate fibers at a longer length and in a large quantity. Recently, silicon optical fibers have also been fabricated by the rod-in-tube technique using a traditional fiber draw tower.4 Although suitable for regular optical fiber manufacturing in a large quantity, the fiber draw tower is not suitable for fabricating small quantities of special fibers that are still in the development stage and that may require many iterations to be performed quickly to determine the proper processing parameters. Once all these parameters are determined, a fiber draw tower might then be used to make large quantities of the fiber at the predetermined conditions. In Ref. 4, fibers were drawn from a preform that had a silicon rod sleeved by silica tubes. These fibers ranged in diameter from , making them inflexible. Thus, their functionalities as practical fibers are very limited.