Multi-carrier modulation fiber optic systems constructed using a series of electrical carriers, modulating the data on the electrical carriers and combining the carriers to form a wideband signal. The wideband signal can then be intensity modulated on a laser and coupled to a fiber optic channel. A receiver...http://www.google.com.hk/patents/US7729452?utm_source=gb-gplus-share專利 US7729452 - Method, apparatus and system for high-speed transmission on fiber optic channel
