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Dispersionless time-lens with an integrated silicon nitride ring resonator
Author(s): Arijit Misra; Stefan Preußler; Linjie Zhou; Thomas Schneider
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Paper Abstract

The observation of ultrafast signals by expanding them to a time scale that enables the measurement with conventional high-speed systems is of considerable interest in many applications. Usually, a time-lens can be used for this purpose. Like a lens in optics, a time lens expands the signal in time. This can be accomplished by a strong first order dispersion. However, higher order dispersion leads to a distortion of the signal and an integration of elements with a strong first order dispersion is challenging. Here we present a dispersion-less time-lens with an integrated ring resonator. Several replicas of a single input signal are generated by a microring resonator having a free spectral range (FSR) much less than the bandwidth of the input signal. These copies are then subjected to a coupled Mach-Zehnder intensity modulator (MZM) system driven by a single sinusoidal radio frequency (RF) signal to generate copies of the input spectrum. In the time-domain this can be seen as a multiplication of the input signal with a sinc-pulse sequence. The sinc-pulse sequence is tunable by the single sinusoidal radio frequency. By choosing a suitable radio frequency, the signal waveform can be sampled at a different position for each copy, so that an expanded waveform with a configurable stretching factor determined by the input RF can be achieved. This time lens system can be fully integrated into a photonic integrated circuit and requires neither an optical source nor a dispersive medium. In first preliminary experiments we present a sampling rate of around 110 GSa/s.

Paper Details

Date Published: 4 March 2019
PDF: 6 pages
Proc. SPIE 10921, Integrated Optics: Devices, Materials, and Technologies XXIII, 109211O (4 March 2019); doi: 10.1117/12.2506793
Show Author Affiliations
Arijit Misra, Technische Univ. Braunschweig (Germany)
Stefan Preußler, Technische Univ. Braunschweig (Germany)
Linjie Zhou, Shanghai Jiao Tong Univ. (China)
Thomas Schneider, Technische Univ. Braunschweig (Germany)

Published in SPIE Proceedings Vol. 10921:
Integrated Optics: Devices, Materials, and Technologies XXIII
Sonia M. García-Blanco; Pavel Cheben, Editor(s)

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