  We analyze whether the THz transmission distance can be extended with
systematic linear network coding (sRLNC) and a low-bitrate additional channel.
While various coding techniques have been proposed to mitigate issues of
channel quality, and other techniques have used auxiliary channels to enable an
effective THz transmission system configuration, their combination is new, and
carries potential for significant improvements in transmission quality. Our
specific solution is designed to complementing a generic low complexity FEC
code by a low complexity erasure code (sRLNC), whereby channel coding is
proposed to simultaneously send the native and coded data over two parallel
channels, including one main THz channel and one auxiliary channel with
comparably lower bitrate. We show theoretically that the proposed system can
improve throughput, support higher modulation levels and transfer data over the
longer distances with THz communications.
