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Our proposal adds an arrayed waveguide grating (AWG) operated at 1.5 mu m to the star coupler of a passive optical network (PON) in the remote node (RN) and separates the original PON and the overlay via 1.3/1.5 mu m splitters, which guarantees the maintenance function

An all-optical passive WDM high capacity overlay on a passive optical network (PON) is proposed and experimentally verified, using AWGs and direct detection receivers. The unmodified outside fibre plant and the AWG can be supervised from the central office (CO)

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