Digital signal processing for fiber-optic communications

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Recent developments in digital signal processing technology have led to a new paradigm in fiber-optic communications. The realization of suitable high-speed digital-to-analog converters, analog-to-digital converters, and digital signal processors has allowed advanced digital signal processing to offer substantial improvements in system performance and functionality. The signal processing can be performed in the transmitter or the receiver. In the transmitter, the synthesis of the appropriate drive signals for an optical modulator permits the generation of modulated optical signals with unprecedented control of the signal amplitude and phase. This allows for the pre-compensation of transmission impairments and non-ideal device properties, and the generation of spectrally efficient modulation formats that require complex multi-level drive signals. In the receiver, coherent detection recovers both the amplitude and phase of the received optical signal, thereby allowing digital signal processing to effectively post-compensate transmission impairments and implement key receiver functions.