Higher order mode generation in an anti-resonant hollow-core fiber

Hollow core fibers have been investigated for several use cases relating to both single mode and multi-mode operation. Single mode, low-loss operation is a desired commodity in telecommunications and high-power delivery applications. Hollow core fibers can be designed with a structure that guides multiple modes in the core at low loss while also exhibiting strong stress sensitivity. In these anti-resonant hollow core fibers, perturbations to the structure such as micro-bending can efficiently couple core guided modes in short sections of fiber. This high sensitivity to structural distortion can be exploited for higher order mode generation, sensing, and for developing multimode nonlinear light sources. This work presents an investigation on using anti-resonant hollow-core fibers as a higher-order mode converter by inducing mechanical stress on the structure of the fiber.