Patent ID: 9660754
Date: 2017-05-23
CPC Classifications: H04J

Claim:
1. A method in an optical network termination for use in a wavelength division multiplexing passive optical system, the method comprising: receiving one optical sub-signal extracted from a multiplexed optical downstream signal that was transmitted from an optical line terminal via a passive distribution node, identifying the received sub-signal, and the method characterized in: setting an optical wavelength of an upstream optical signal as a function of a predefined relationship between an optical wavelength of the received sub-signal and the optical wavelength of the upstream signal, wherein the predefined wavelength relationship is implemented as a difference in filtering properties of a filter device for the identifying of the received sub-signal and a filter device for the setting of the wavelength of the upstream signal, and transmitting the upstream signal to the optical line terminal via the passive distribution node.