Patent ID: 9014568
Filing Date: 2015-04-21
Classification: H04B

Abstract:
1. An optical access network with centralized digital optical line termination OLT comprising: an optical line termination (OLT) unit having a digital transmitter and a coherent receiver for downstream signal transmitting and upstream signal receiving; and at least one optical network unit ONU with transceiver functions for communicating with said OLT unit over an optical path, said ONU including an analog transceiver with intensity modulation and single photodiode detection; wherein said digital transmitter includes digital signal processing DSP module, digital-to-analog conversion DAC module, and the coherent receiver in the DSP module that can be shared by one or more of said ONUs in said network, said DSP module reducing or removing dispersion and non-linearity effects in said network and said coherent receiver enabling performance of said downstream stream signal transmitting to match that of said upstream signal receiving in said OLT, said coherent receiver having a plurality of ADCs coupled to a Colorless, Directionless, Contentionless (CDC) communicating with a phase locked loop and to an on-off keying OOK demapper.