Abstract
Photonic time-stretch (PTS) technology enables revolutionary technical breakthroughs in ultrafast electronic and optical systems. By means of employing large chromatic dispersion to map the spectrum of an ultrashort optical pulse into a stretched time-domain waveform (namely, using the dispersive Fourier transformation), PTS overcomes the fundamental speed limitations of conventional techniques. The chromatic dispersion utilized in PTS can be implemented using multiple optical prism arrays, which have the particular advantages of low loss in the extended spectrum outside of the specific telecommunication band, flexibility, and cost-effectiveness. In this article, we propose and demonstrate the PTS technology established for a pair of prisms, which works as a data acquisition approach in ultrafast digitizing, imaging, and measurement regimes.
Highlights
In digital signal processing (DSP), the data consists of finite samples of discrete values, derived from a practically continuous physical system [1,2]
The simulated result illustrates that the spectral resolution of Photonic time-stretch (PTS) spectroscopy primarily relies on the wavelength of the incident light when the modality is built with a prism pair
Pair of prisms serving as the dispersive medium for DFT provide a premium candidate for addressing the fundamental challenges of generating a large amount of dispersions in PTS systems, which operates in the spectrum outside of the ordinary telecommunications band
Summary
In digital signal processing (DSP), the data consists of finite samples of discrete values, derived from a practically continuous physical system [1,2]. With its distinct attributes of sufficiently large optical bandwidth and immunity to channel-to-channel crosstalk, photonic DSP is capable of acquiring ultra-fast pulses and achieving analog-to-digital conversion of wideband electrical signals. The peculiar merits of multiple-prism systems, generally creating negative group-velocity dispersion, include low insertion loss, ease of adjusting, and mitigation of transverse displacement of temporally dispersed beams [35,36]. For this reason, the multiple-prism approach shows great potential for implementing PTS processes with large and uniform chromatic dispersion, which is essentially required in DFT.
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