T bit/s Coherent Optical Transmission with Frequency Division Multiplexing

New services such as high definition(HD)TV,video-on-demand(VOD),and cloud computing require a large and flexible optical fiber transmission network.This paper highlights several ways of creating super channels that are capable of T bit/s transmission.Limited by electronic bottleneck,T bit/s transmission requires a super-channel with many intensive optical orthogonal subcarriers.Orthogonal frequency division multiplexing(OFDM)multicarrier technology and single-carrier technology with time or frequency domain equalization can be used on each optical subcarrier.Bandwidth-variable optical transmission and switching can be achieved by adjusting the optical subcarrier quantity,granularity,or applied modulation formats.