Employing air-filled core surrounded by glass webbing, Hollow-Core Fiber allows light to propagate through free space rather than solid glass core. Radiation hardened fiber can be bent and coiled to tight bend radius while guiding light. Single-spatial-mode forces light to take only single path, enabling high bandwidth and low noise. Orientation of light waves is fixed in fiber, which is necessary for applications such as sensing, interferometry, and secure communications.
This story is related to the following:Optical Fibers