Abstract
Single-pixel cameras reconstruct images from a stream of spatial projection measurements recorded with a single-element detector, which itself has no spatial resolution. This enables the creation of imaging systems that can take advantage of the ultra-fast response times of single-element detectors. Here we present a single-pixel camera with a temporal resolution of 200 ps in the visible and short-wave infrared wavelengths, used here to study the transit time of distinct spatial modes transmitted through few-mode and orbital angular momentum mode conserving optical fiber. Our technique represents a way to study the spatial and temporal characteristics of light propagation in multimode optical fibers, which may find use in optical fiber design and communications.
Highlights
Conventional cameras record images using pixelated sensor arrays
The single-pixel detector measures the total intensity transmitted through the digital micro-mirror device (DMD) mask as a function of time, which constitutes a measurement of the level of correlation between the incident light field from the optical fiber and the mask pattern displayed on the DMD
In this work we have demonstrated a single-pixel camera that is sensitive in the visible and short-wave infrared (SWIR) with a temporal resolution of 200 ps
Summary
Conventional cameras record images using pixelated sensor arrays. In contrast, single-pixel imaging enables images to be reconstructed using a single-element detector such as a photodiode. We exploit the ultra-fast response times of single-element detectors to image light-in-flight, we apply the technique to directly observe the spatial and temporal evolution of light propagating through multimode optical fibers (MMFs). Timing resolution for ICCD systems range from a few nanoseconds to 200 ps by using an intensifier as a shutter to briefly expose the CCD, this produces a large pixel array that is capable of single-photon imaging As these methods rely on silicon detectors, they have no sensitivity to photon wavelengths outside of the visible and near-infrared. In this work we apply a temporally resolved single-pixel camera, operating with a temporal resolution of 200 ps, to observe the transit of light pulses propagating through multimode fibres This allows direct observation of the transit time of different spatial mode groups supported by the fibers. By replacing the visible detector with a short wave infra-red counterpart, we switch our system to operate in the SWIR telecommunication band, and use it to measure mode group transit time through an orbital angular momentum (OAM) conserving air-core fiber
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