Design and modeling of multimode interference structures made by two step ion exchange in glass

摘要

Design, fabrication and RNF measurement of the optical multi-mode interference power splitter 1 to 2 with graded refractive index is reported. The design was developed by utilizing numerical solutions using the finite difference beam propagation method for operation wavelength 1550 nm. The deposition tests that led to the fabrication of the proposed structures were made after designing the structures. Several samples of optical MMI splitters 1×2 were obtained by Ag~+(← →)Na~+ two step field assisted ion exchange process in molten salt into a new special optical glass substrate for ion exchange technology. The refractive index profile of the channel waveguide was verified by the direct measurement near-filed method by the Refractive Near Field Profilometer.