A special kind of microstructured optical fiber is proposed and fabricated in which, in addition to the holey region (solid core and silica-air cladding), two large holes exist for electrode insertion. Either Bi-Sn or Au-Sn alloys were selectively inserted into the large holes forming two parallel, continuous and homogeneous internal electrodes. We demonstrate the production of a monolithic device and its use to externally control some of the guidance properties (e. g. polarization) of the fiber.
Chesini, G., Cordeiro, C. M. B., de Matos, C. J. S., Fokine, M., Carvalho, I. C. S., & Knight, J. C. (2009). All-fiber devices based on photonic crystal fibers with integrated electrodes. Optics Express, 17(3), 1660-1665. https://doi.org/10.1364/OE.17.001660