KEYWORDS: Signal detection, Multimode fibers, Sampling rates, Pulse signals, Dispersion, Compressed sensing, Analog to digital converters, Reconstruction algorithms
We demonstrate the capability of the multimode fiber and photonic time-stretch based compressive sampling scheme to detect chirp radio frequency signals, with the advantages of fast speed, high accuracy, less complexity and low cost.
We propose a joint pre-compensation method based on digital resolution enhancer (DRE) and Tomlinson-Harashima precoding (THP) for low-resolution data center optical interconnect. DRE is utilized to reduce the quantization noise of the digital-to-analog converter (DAC), while THP is utilized to fall off the frequency fading caused by the system bandwidth limitation and chromatic dispersion. By combining THP and DRE, we can achieve a 112-Gb/s PAM4 system over a 40-km standard single-mode fiber with a physical number of bits (PNOB) = 4 DAC on the transmitter side Moreover, using THP in bandwidth-constrained systems can increase the transmission capacity by 26.15%.
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