Sub‐carrier channel demultiplexing of THz‐wave OFDM signal assisted by optical technology.

A real‐time processing method for demultiplexing a high‐speed terahertz (THz)‐wave OFDM signal is proposed and demonstrated. An electrical signal, which is down‐converted from the THz‐wave OFDM signal, is up‐converted into an optical OFDM signal through an optical modulator. Then, the generated optical OFDM signal is demultiplexed into sub‐carrier channels in the optical domain by utilising an integrated‐optic OFDM demultiplexer with discrete Fourier transform function. The processing principle of the method and some preliminary experimental results including BER measurement to demonstrate the effectiveness of the method are reported. A 2 × 10 Gbit/s THz‐wave OFDM signal was demultiplexed into sub‐carrier channels with the method as preliminary investigation. [ABSTRACT FROM AUTHOR]