| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the minimum reception level of a high speed optical network unit (ONU) without having an influence on a low speed ONU, regarding a passive optical network (PON) system in which data of different bit rates coexist. <P>SOLUTION: Regarding the PON system of the present invention, in an optical line terminal (OLT) 10, data of different bit rates are framed, framed data rows are subjected to forward error correction (FEC) encoding processing without changing the line-up of the data, a check bit is added to the end of the frame, and an optical signal that has been modulated in accordance with the data row to which the check bit has been added is transmitted to an optical transmission line 1. Then, in an ONU 30 that corresponds to a high speed bit rate to which an optical signal from the OLT 10 has been applied via a power splitter 2, error correction of the reception data is performed, thereby attaining improvement in the reception sensitivity of the ONU 30. <P>COPYRIGHT: (C)2008,JPO&INPIT |
