All‐Optical Parametric‐Assisted Oversampling and Decimation for Signal Denoising Amplification

Decimation is a common process in digital signal processing that involves reducing the sampling rate of an oversampled by linearly combining consecutive samples. Among other applications, this represents simple means to mitigate noise content signal. In work, novel optical concept inspired these operations proposed, which called Parametric-assisted Oversampling and (POD). By using all-fiber setup, POD processor first realizes ultra-fast parametric oversampling incoming temporal (at >100 Gigasamples per second), followed decimation reduces any user-defined factor lossless manner. way, delivers amplified sampled copy signal, where peak-to-peak gain results from combination amplification “passive” equal factor. report, joint passive ≈50 on GHz-bandwidth signals demonstrated. Furthermore, it shown can effectively effects narrowband noise, outperforming traditional filtering techniques. experimentally achieving ultra-high factors (>750), (MHz-bandwidth) waveformsthat are lost much stronger background recovered.