A multivendor multiservice local network based on wavelength-division multiplexing and subcarrier multiplexing

A novel optical network based on wavelength-division-multiplexing (WDM) and subcarrier-multiplexing (SCM) technologies is proposed that allows support of multiple service vendors on a common distribution infrastructure. At the central office, wavelengths lambda /sub 1/ to lambda /sub 8/, which carry switched information streams to eight separate subscribers, are multiplexed optically onto one optical fiber. Another eight distinct wavelengths, lambda /sub 9/ to lambda /sub 16/, are used to carry the broadcast video channels of eight video vendors to the subscribers. The signals on the eight video wavelengths are combined and split 128 ways using all 8*128 asymmetric star coupler. Each of the 128 outputs is associated with a set of eight subscribers, and each output is combined with the output of an associated WDM device through a coupler. Thus, each video source supports a total of 128*8=1024 subscribers. An optical amplifier is used to boost the combined signals.<>