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We demonstrate the first multicore multimode fiber (MC‐MMF) for passive optical network, efficiently utilizing the space division multiplexing to reduce the upstream traffic losses by eliminating the need of multiple feeder fibers. From the simulation results, the error‐free performance is achieved for upstream transmission over 18 modes of MC‐MMF. The differential group delay per unit length of fiber is also analyzed at different modes of MC‐MMF with attenuation per unit length of fiber, respectively.

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