Multiplexed Single-Mode Wavelength-to-Time Mapping of Multimode Light

Harikumar Kuzhikkattu Chandrasekharan, Frauke Izdebski, Itandehui Gris-Sanchez, Nikola Krstajic, Richard Walker, Helen Bridle, Paul A. Dalgarno, William Neil MacPherson, Robert Henderson, Tim A. Birks, Robert R. Thomson

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When an optical pulse propagates along an optical fibre, different wavelengths travel at different group velocities. As a result, wavelength information is converted into arrival-time information, a process known as wavelength-to-time mapping. This phenomenon is most cleanly observed using a single-mode fibre transmission line, where spatial mode dispersion is not present, but the use of such fibres restricts possible applications. Here we demonstrate that photonic lanterns based on tapered single-mode multicore fibres provide an efficient way to couple multimode light to an array of single-photon avalanche detectors, each of which has its own time-to-digital converter for time-correlated single-photon counting. Exploiting this capability, we demonstrate the multiplexed single-mode wavelength-to-time mapping of multimode light using a multicore fibre photonic lantern with 121 single-mode cores, coupled to 121 detectors on a 32 × 32 detector array. This work paves the way to efficient multimode wavelength-to-time mapping systems with the spectral performance of single-mode systems.
Original languageEnglish
Article number14080
JournalNature Communications
Publication statusPublished - 25 Jan 2017


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