High-speed and broadband digital receiver based on optical sampling pulse waveform matching.

In this Letter, we propose a high-speed, broadband photonic digital receiver that can realize the matched filtering of the digital signal through shaping the optical sampling pulse according to the specific waveform of the transmitted digital signal. The receiver's filtering response is matched with the spectrum of the digital signal's specific waveform, and the instantaneous signal-to-average-noise ratio of the filtered signal is maximized at the sampling points. The principle of proposed receiver is theoretically analyzed and experimentally verified. The weak digital signals with different signal-to-noise ratio are detected and correctly distinguished in the experiments.