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We propose a novel approach based on modeled blazed grating (MBG) to realize the mode conversion, multiplexing, demultiplexing, and switching in few-mode transmission fibers. The proposed grating can distribute different modes to different diffraction orders. We demonstrate the generation, multiplexing, demultiplexing, and high efficient conversion and switching of independent coaxial modes in a few-mode transmission fiber using MBG experimentally.