Patent ID: 8116627

Claim:
A passive optical network (PON) system, comprising: an optical line terminal (OLT) and a plurality of optical network units (ONU) connected via an optical fiber, OLT including an optoelectronic transducer that changes in current multiplication factor according to applied reverse-bias voltage, the OLT determining, when allocating transmission bandwidths of upstream signals to the plurality of ONUs, an allocation order of the transmission bandwidths in such a way that, for each ONU of the plurality of ONUs to which a subsequent transmission bandwidth is allocated immediately after a previous transmission bandwidth was allocated to another ONU of the plurality of ONUs, a voltage difference between a reverse-bias voltage necessary to receive an upstream signal from the ONU to which the subsequent transmission bandwidth is allocated and a reverse-bias voltage necessary to receive an upstream signal from the ONU to which the previous transmission bandwidth was allocated is satisfactorily small.