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A novel approach based on few-mode tilted fiber Bragg grating (FM-TFBG) to realize mode conversion, mode multiplexing, mode de-multiplexing and space-division multiplexing (SDM)-wavelength division multiplexing (WDM) simultaneously is proposed and studied theoretically in this paper. In FM-TFBG, forward-propagating core guided modes can be converted to radiated modes when the phase matching condition...
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