Phys.org February 2, 2022
Mitigating the stochastic noise introduced during the generation, transmission, and detection of temporal optical waveforms remains a significant challenge across many applications. An international team of researchers (Canada, Spain) proposed a versatile concept for simultaneous amplification and noise mitigation of temporal waveforms, and successfully demonstrated on optical signals with bandwidths spanning several orders of magnitude, from the kHz to GHz scale. The concept was based on lossless temporal sampling of the incoming coherent waveform through Talbot processing. By reaching high gain factors (>100), they showed the recovery of ultra-weak optical signals, with power levels below the detector threshold, additionally buried under a much stronger noise background. The method is inherently self-tracking, a capability demonstrated by simultaneously denoising four data signals in a dense wavelength division multiplexing scheme. Their work is relevant to various fields like telecommunications, bioimaging and remote sensing… read more. Open Access TECHNICAL ARTICLE
Narrowband filtering concept… Credit: Optica Vol. 9, Issue 1, pp. 130-138 (2022)Â