This paper briefly highlights advancements in crystalline semiconductor core optical fibers. Such fibers potentially open the doors to marry on-chip optoelectronics with fiber optics, particularly nonlinear fiber optics. However, since crystals are grown, not drawn like glass, their fabrication into practical lengths represented a major limitation. This limitation can be overcome using the molten core method (MCM), which affords long lengths of crystalline core fibers using industry accepted glass fiber draw methods. This paper briefly reviews the process and the crystalline semiconductor core fibers realized to-date.

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J. Ballato, T. Zaengle, and T. W. Hawkins, "In-fiber crystal growth," Proc. SPIE 12399, Solid State Lasers XXXII: Technology and Devices, 1239903 (Presented at SPIE LASE: January 31, 2023; Published: 8 March 2023); https://doi.org/10.1117/12.2655518.