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For cost and design simplicity, various optical access network architectures have been proposed where downstream traffic from the optical line terminal to the optical networking unit is transmitted by carriers in the 1550 nm window and upstream traffic by those in the 1300 nm window. A new generation of multimode fibre has been designed to accommodate this requirement and to address technical challenges associated with fibre coupling. By restricting the number of modes at both fibre input and output using off-the-shelf singlemode transceivers, single-wavelength 40 Gbit/s data transmission over 3.4 km broad wavelength window multimode fibre has been demonstrated. A bandwidth distance product of 136 Gbit/s is achieved.