Patent ID: 8565619
Filing Date: 2013-10-22
Classification: H04J

Abstract:
1. An apparatus for preventing collision of upstream signals, suitable for a time division multiplexing (TDM) passive optical network (PON), the apparatus comprising: an optical coupler device, for receiving a first optical signal and splitting the first optical signal into a detection optical signal and a data optical signal, wherein the first optical signal is provided by an optical network unit (ONU); an optic-electron converter (O/E), coupled to the optical coupler device, for converting the detection optical signal into a first electrical signal; a control system, coupled to the O/E, for generating a control signal according to the first electrical signal; and an optical signal switch module, coupled to the optical coupler device and the control system, for determining whether to guide the data optical signal to a photoresist device of the optical signal switch module away from passing the apparatus for preventing collision of upstream signals according to the control signal, wherein the optical signal switch module guides the data optical signal away from passing the apparatus for preventing collision of upstream signals while the ONU is in an continuous wave (CW) mode if the continuous time of the first electrical signal being greater than a threshold value is longer than a predetermined time; and the optical signal switch module allows the data optical signal to pass the apparatus for preventing collision of upstream signals while the ONU is in an burst mode if the continuous time of the first electrical signal being greater than the threshold value is not longer than the predetermined time.