METHOD AND ARRANGEMENT FOR TRANSMITTING SIGNALS IN A POINT TO MULTIPOINT NETWORK

摘要

Bidirectional data signals are exchanged between a central unit and a plurality of network terminals. A modulator unit (MOD_OLT) of the central unit modulates data signals (DSl - DSlO) onto subcarriers (?1 - ?10), generates two optical sin- gle sideband signals (LSB) and (USB) and combines both sideband signals with 180° phase shifted carrier signals (CW, CWI). The optical network units select their associated downstream signal and generate an associated upstream signal. The frequencies of the downstream and upstream signals are chosen that reflections do not interfere with the selected signal at the optical network unit and not with the received upstream signals at the central unit.