The phase-conjugation is achieved by four-wave mixing in an optimized semiconductor optical amplifier (SOA), which solves the dispersion problem of the FSK/IM orthogonal signal.

• 其中,FSK/IM正交信号的频谱反转由基于半导体光放大器(SOA)的四波混频效应实现,此技术有效克服了FSK/IM正交信号在传输中色散带来的影响。