Patent ID: 9197349
Filing Date: 2015-11-24
Classification: H04J

Abstract:
1. A method of operating a primary optical node, particularly an optical line terminal, (OLT), for an optical communications system wherein said OLT is configured to receive at least one upstream optical signal from at least one secondary optical node, particularly optical networking unit (ONU) within at least a first wavelength range, and to transmit at least one downstream optical signal to said at least one ONU within at least a second wavelength range, wherein said OLT: determines a currently unused wavelength subrange within said first wavelength range identifying at least a highest and lowest currently unused wavelength in the subrange; assigns a specific target wavelength within said currently unused wavelength subrange to said ONU; signals said target wavelength to said ONU; receives an upstream signal from said ONU; and provides feedback information to said ONU which comprises information on an indication whether said actual wavelength of said upstream optical signal is within the subrange with respect to the target wavelength.