Abstract
In this chapter, we introduce and analyze the coherent optical transmission system.We focus on the quasi-linear coherent optical detection system based on advanced digital signal processing technology, including front-end linear pre-equalization algorithm and back-end nonlinear processing algorithm. The bandwidth limitations of the device and the nonlinear damage of the fiber link have always been two important factors limiting the transmission of high-speed optical signals. The former limits the bandwidth and baud rate of the signal generation, while the latter limits the transmission distance of high-speed signals.
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