Patent ID: 8150259

Claim:
A passive optical network system, comprising: a plurality of optical signal splitter receiving optical signals from a plurality of optical network units (ONUs) to provide a plurality of upstream optical signals having different wavelengths; a hybrid optical filter multiplexing the plurality of upstream optical signals in a wavelength division multiplexing (WDM) scheme; and an optical line terminal (OLT) receiving the multiplexed upstream optical signals in a time division multiplexing (TDM) scheme, wherein the optical line terminal comprises a wavelength divider dividing the multiplexed upstream optical signals into a plurality of groups according to the wavelengths, and a plurality of optical receivers receiving the divided groups from the wavelength divider, and wherein at least one of the optical receivers combines a plurality of optical network units corresponding to a plurality of wavelengths included in any one of the groups input among the plurality of optical network units in the time division multiplexing (TDM) scheme.