Ultrasensitive Dispersive Fourier Transform Characterization of Nonlinear Instabilities
2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)(2023)
摘要
Noise-driven dynamics of modulation instability (MI) continue to be a source of great interest since it lies at the heart of many nonlinear optical systems. [1]. The Dispersive Fourier transform (DFT) is a well-known optical characterization technique, which was demonstrated useful to gain insight into such complex dynamics [2]–[3]. Using optoelectronic detection, single-shot spectra can be captured in the time domain, and statistical analysis of such fluctuations can be performed, as shown in Fig. 1(a). However, fast photodetectors (e.g. photodiode - PD) are limited by their detection bandwidth, which can only reach a few tens of GHz, thus limiting the equivalent spectral DFT resolution. Furthermore, their low sensitivity with poor noise figures, paired with the low dynamic range of high-speed oscilloscopes, drastically hamper real-time spectral measurements at low intensity (or for signals with over 30 dB contrast). Here, we propose an innovative variation of this technique that overcomes these limitations by using multiple single photon detectors (SPD).
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关键词
complex dynamics,detection bandwidth,equivalent spectral DFT resolution,fast photodetectors,heart,low dynamic range,MI,modulation instability,noise figure 30.0 dB,noise-driven dynamics,nonlinear instabilities,nonlinear optical systems,optical characterization technique,optoelectronic detection,poor noise figures,real-time spectral measurements,single-shot spectra,statistical analysis,time domain,ultrasensitive Dispersive Fourier transform characterization
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