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We theoretically and experimentally investigate a singlemode-multimode- singlemode (SMS) structure based on chalcogenide (As 2S 3) multimode fiber and conventional silica singlemode fibers. The experimental results show a general agreement with the numerical simulation results based on a wide angle-beam propagation method (WA-BPM). The chalcogenide fiber and silica fibers were mechanically spliced and packaged using a UV cured polymer with a low refractive index on a microscope slide. Multimode interference variation was observed by photo-induced refractive index changes resulting from both a localized laser irradiation at a wavelength of 405 nm and a UV lamp. Our result provides a platform for the development of compact, high-optical-quality, and robust photonic nonlinear devices. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

An SMS fiber structure based on chalcogenide multimode fiber