Abstract: The recently reported the high spectral efficiency and high-baud-rate signal transmission are all based on digital signal processing (DSP). DSP simplifies the reception of advance modulation format and also enable the major electrical and optical impairments to be processed and compensated in the digital domain, at the receiver or transmitter side. In this paper we summarize the research progress on high speed signal detection.

Keywords: DSP, FDM, Coherent system, SDM, Optical communication, Advanced DSP.