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We propose a fiber-based 4-LP mode(LP01,LP11,LP21 and LP02)multi/demultiplexer,which excites or separates 4-LP mode simultaneously in the integrated structure of a single optical fiber.The structure contains a 4-mode transmitting core in the center of the fiber and the other three multi/demulitplexing parts(consist of a coupling core and several assistant cores or not)which are deployed around the transmitting core with 120 degrees between each other.