Patent ID: 7389048
Filing Date: 2008-06-17
Classification: H04J

Abstract:
1. A wavelength-division multiple access system having a center apparatus (OLT), n optical network units (ONU), and m ONUs arranged via a wavelength multi/demultiplex apparatus, the OLT and the wavelength multi/demultiplex apparatus being connected together in a multiplex section via multiplex section optical fibers, the wavelength multi/demultiplex apparatus and the ONUs being connected together in an access section via access section optical fibers, downlink optical signals from the OLT to the ONUs and uplink optical signals from the ONUs to the OLT being transmitted through the multiplex section using wavelengths assigned to the respective ONUs while multiplexing the wavelengths, the wavelength multi/demultiplex apparatus carrying out wavelength multiplexing or demultiplexing for bidirectional transmissions, wherein a wavelength band Da (wavelengths λd said OLT comprises: said wavelength multi/demultiplex apparatus comprises: each of the ONUs comprises: