All-Optical Switching Based on Induced Wavelength Shift in a CDSSE-Doped Fiber

摘要

A non-linear, doped spaciality fiber was fabricated consisting of cadmium sulfurselenide (CdSSe). The fiber had a core composed of a Schott Glass material (RG630). The RG630 is a CdSSe/glass composite material in which the semiconductor is in the form of nano-spherical particles with average diameter of 3.7 nm and occupies a volume fraction of 0.32%. Previous theoretical modeling indicated that such a semiconductor doped fiber would have a nonlinear refractive index higher than ordinary silica fiber and yet have losses low enough to be of practical significance. Three major phases of the effort were performed. Phase-I; fabrication of the fiber for single mode operation in the wavelength region of 1300 nm and 1550 nm (communication wavelength regions), Phase-II; characterization of the linear performance of the fiber (ie; transmitivity and absorption coefficient were determined), and Phase-III; characterization of the nonlinear refractive index of the fiber. The response time of nonresonant effects were measured between 1-10 Ps. This suggested that such a fiber could be used to design ultrafast optical switches and modulators.