METHOD FOR DETERMINING PHYSICAL LAYER WAVELENGTH OF TUNABLE OPTICAL NETWORK UNIT IN TIME AND WAVELENGTH DIVISION MULTIPLEXING-PASSIVE OPTICAL NETWORK

摘要

The purpose of the present invention is to provide a method for determining a physical layer wavelength, whereby an optical network unit (ONU) with a tunable receiver is enabled to effectively select an available channel, i.e., a downstream wavelength in a system, such as a TWDM-PON system, in which multiple channels can be operated. Provided is a method for determining a physical layer wavelength of a tunable ONU in a time wavelength division multiplexing-passive optical network (TWDM-PON). First, a receiving wavelength of a tunable receiver is tuned to a downstream wavelength of one among a plurality of channels operable in a TWDM-PON system. Then, it is checked whether the tunable receiver maintains a state of loss of signal (LOS) or the state of LOS is cleared, for a predetermined period of time. In response to a determination that the state of LOS is cleared, the ONU performs subsequent link establishment procedures in the channel, and in response to a determination that the state of LOS is maintained, the receiving wavelength of the tunable receiver is changed to a downstream wavelength of another channel.;COPYRIGHT KIPO 2015