DYNAMIC BANDWIDTH ALLOCATION METHOD, OLT, AND PON SYSTEM

摘要

In a PON system in which plural kinds of modulation schemes coexist, when uplink burst signals from respective ONUs are received, the receiving efficiency degrades as the number of the times of switching of the modulation scheme increases. In an optical access (PON) system supporting plural kinds of modulation schemes, an OLT allocates bandwidths for uplink signals, i.e., transmission timings each including a transmission start time and a transmission duration, to ONUs, respectively, such that the bandwidths allocated to plural ONUs for the same modulation scheme are as successive as possible. Based on the transmission timings allocated to the respective ONUs, the OLT switches the modulation scheme of a modulation-scheme variable burst-mode optical transmitter/receiver by control of a modulation scheme controller.

主权项

1. A dynamic bandwidth allocation method, wherein bandwidths for uplink signals transmitted from a plurality of ONUs (Optical Network Units) to an OLT (Optical Line Terminal) in a PON (Passive Optical Network) system supporting a plurality of kinds of modulation schemes are allocated to the plurality of ONUs, respectively, in such a manner that bandwidths allocated to ones of the ONUs, which employ the same one of the modulation schemes for transmission signals, are successive.