| 摘要 |
A baseband transceiver in a WDM/SCM(Wavelength Division Multiplexing Sub-Carrier Multiplexing)-PON(Passive Optical Network) is provided to offer a high-speed data service of more than 100 Mbps to each ONT(Optical Network Terminal), to simply implement the structure of an analog transceiver by executing digital modulation and demodulation, and to secure the SNR gain of an optical Tx/Rx channel by restoring bit errors of a transmission line through an error correction encoder. A baseband transmitter in a WDM/SCM-PON consists of an error correction encoding part(402), a scrambling part(403), a digital modulation part(404), a preamble insertion part(405), a transmission filter(406), and a digital/analog conversion part(407). The error correction encoding part(402) receives data, recombines or encodes the data, and adds a certain error correction bit to the data. The scrambling part(403) scrambles output data of the error correction encoding part(402). The digital modulation part(404) converts the scrambled data into modulated symbol data based on a certain modulation scheme. The preamble insertion part(405) adds a preamble to the preamble-added modulated symbol data. The transmission filter(406) cancels interference between the modulated symbol data. The digital/analog conversion part(407) converts the interference-cancelled modulated symbol data into an analog signal and creates a baseband signal. |
