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In this letter, we propose a method to implement a 155-Mb/s optical star network using existing passive optical network (PON) cable plant and demonstrate its feasibility experimentally. The light-emitting diode-(LED) based optical star network, wavelength-compatible with the asynchronous transfer mode (ATM) PON system, showed a power penalty of 1.1 dB compared to back-to-back connection. The overlay network had little effect on ATM PON signals.Index Terms-Asynchronous transfer mode passive optical network system, local area network, optical access network, optical star network, passive optical network.

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