A Two-Dimensional Fiber Grating Coupler on SOI for Mode Division Multiplexing

A grating-based approach to exciting higher order fiber modes in a few mode fibers is presented. By exploitation of higher order modes of silicon on insulator nanowaveguides and by the illumination of the grating from opposing ends, the LP 01 , LP 11, a , LP 11, b , and LP 21, a fiber modes could be excited in two orthogonal polarizations. Simulative and experimental results as a proof of principle are presented.