Abstract:
The present document relates to optical transmission systems. In particular, the present document relates to a system and method enabling the coexistence of tunable and non-tunable Optical Network Units (ONUs) in a passive optical network (PON), e.g. a wavelength division multiplexing (WDM) PON. A media access controller for a passive optical network (200) is described. The passive optical network (200) comprises a first optical line terminal (201) with a receiver for a first wavelength range; a second optical line terminal (202) with a receiver for a second wavelength range, adjacent to the first wavelength range; and an optical network unit (101) with a transmitter having a transmitter wavelength which drifts between the first and the second wavelength range. The media access controller is adapted to assign the optical network unit (101) to the first (201) and the second (202) optical line terminal, such that an optical burst transmitted by the optical network unit (101) is received by the first optical line terminal (201) and the second optical line terminal (202).
Abstract:
The invention relates to a method for operating an optical transmission line with several transmission channels for communication of several optical transmitters with several optical receivers using different wavelengths (lambda1 to lambda20), where to each optical receiver an optical transmission channel is assigned, wherein to each transmission channel a set of different wavelengths (lambda1, lambdas, lambda9...; lambda2, lambda6, lambda10...;...) is assigned, wherein each wavelength is assigned to one set of different wavelength only, wherein the wavelengths of each set of wavelengths are spread over an area of wavelength (lambda1 to lambda20) commonly permitted to all sets of wavelengths, wherein to each optical receiver is assigned a set of optical filters that pass the wavelengths of one set of wavelengths, and wherein each optical transmitter chooses a wavelength from the set of wavelengths assigned to it that is usable for it with small effort, as well as to an optical transmission system, an optical transmitter, a set of optical filters, and an optical filter device.