US Patent 7330438 Apparatus for transceiving packets in WDM-PON

Provided is an apparatus that enables improvement of efficiency of up/downstream packet tensception by reflecting a plurality of variables of packet transmission, such as a temporal variety of packet lengths, asymmetry of downstream and upstream traffics, and an instantaneous burst of a traffic amount, on a loop-back-based WDM-PON. The apparatus includes: a downstream code sensor sensing an idle code from a downstream data frame to be transmitted to an optical network terminal (ONT); a trailer transmission controller receiving an idle code sensing signal from the downstream code sensor and forming a trailer of the downstream data frame (hereinafter, a downstream trailer) by adding overhead for a reception control of the downstream data frame by the ONT and a transmission control of an upstream data frame to be loop-back-transmitted from the ONT; an upstream code sensor receiving and sensing a trailer of the loop-back-transmitted upstream data frame (hereinafter, an upstream trailer); and a trailer reception controller receiving overhead information, which is added by the ONT, for a reception control of the upstream data frame from the upstream code sensor and controlling a reception of the upstream data frame.