A power saving apparatus for an optical line terminal (OLT) and an optical network unit (ONU) is provided. The power saving apparatus includes a determination unit configured to determine whether a data traffic is generated between the ONU and a customer premises equipment (CPE), and a control unit configured to perform control such that each of the OLT and the ONU are converted to a power saving mode if a result of the determination is that a data traffic is not generated.
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