Coherent Optical Communication Systems
نویسنده
چکیده
The rapid evolution of long-haul optical communications systems, witnessed in the last five years, is due to the gradual adoption of spectrally efficient, multilevel modulation formats, in conjunction with polarization division multiplexing (PDM) and coherent intradyne detection assisted by digital signal processing (DSP). The objective of this tutorial chapter is to briefly review the operating principles of state-of-the-art long-haul coherent optical communications systems. Due to limitations in space, it focuses mainly on coherent optical systems using quadrature phase-shift keying (QPSK) modulation.
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