Patent ID: 8649681

Claim:
An optical network unit of a passive optical network, wherein the optical network unit is configured to: set an initial value of an upstream wavelength (w US ) for an upstream signal (US) from the optical network unit to an optical line terminal, iteratively perform the following until an iteration criterion is met: i) transmit the upstream signal (US) to the optical line terminal, ii) receive from the optical line terminal power level data (p) for the upstream signal (US) as measured by the optical line terminal, and iii) set the upstream wavelength (w US ) for the upstream signal (US) to a wavelength-value as a function of a set of power level data associated with a respective upstream wavelength; and select, autonomous from the optical line terminal, the upstream wavelength (w US ) to one of the wavelength-values previously set during the iteratively performing and associated with one of the set of power level data corresponding to a certain power level.