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Optimizing an interleaved p-n junction to reduce energy dissipation in silicon slow-light modulators

Photonics Research 2020年第4期8卷 457-467页

作者： MARCO PASSONI dario gerace LIAM O’FAOLAIN LUCIO CLAUDIO ANDREANI Department of Physics University of Pavia27100 PaviaItaly Centre for Advanced Photonics and Process Analysis Cork Institute of TechnologyCorkIreland Tyndall National Institute CorkIreland Institute for Photonics and Nanotechnologies(IFN)-CNR 20133 MilanoItaly

Reducing power dissipation in electro-optic modulators is a key step for widespread application of silicon photonics to optical *** this work,we design Mach–Zehnder modulators in the silicon-on-insulator platform,which make use of slow light in a waveguide grating and of a reverse-biased p-n junction with interleaved contacts along the waveguide *** optimizing the junction parameters,we discuss the full simulation of the modulator in order to find a proper trade-off among various figures of merit,such as modulation efficiency,insertion loss,cutoff frequency,optical modulation amplitude,and dissipated energy per *** with conventional structures(with lateral p-n junction and/or in rib waveguides without slow light)highlights the importance of combining slow light with the interleaved p-n junction,thanks to the increased overlap between the travelling optical wave and the depletion *** a surprising result,the modulator performance is improved over an optical bandwidth that is much wider than the slow-light bandwidth.

关键词： Optimizing an interleaved p-n reduce energy silicon slow-light modulators

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Thermo-optically induced transparency on a photonic chip

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Light(Science & Applications) 2021年第12期10卷 2482-2491页

作者： Marco Clementi Simone Iadanza Sebastian A.Schulz Giulia Urbinati dario gerace Liam O’Faloain Matteo Galli Dipartimento di Fisica Universitàdi PaviaVia A.Bassi 627100 PaviaItaly Centre for Advanced Photonics and Process Analysis Munster Technological UniversityRossa Ave BishopstownCorkT12 P928Ireland Tyndall National Institute Lee Maltings Complex Dyke ParadeCorkT12 R5CPIreland SUPA School of Physics and AstronomyUniversity of St.AndrewsFifeKY169SSUK Present address:École Polytechnique Fédérale de Lausanne Photonic Systems Laboratory(PHOSL)STI-IELStation 11Lausanne1015Switzerland

Controlling the optical response of a medium through suitably tuned coherent electromagnetic fields is highly relevant in a number of potential applications,from all-optical modulators to optical storage *** particular,electromagnetically induced transparency(EIT)is an established phenomenon in which destructive quantum interference creates a transparency window over a narrow spectral range around an absorption line,which,in turn,allows to slow and ultimately stop light due to the anomalous refractive index *** we report on the observation of a new form of both induced transparency and amplification of a weak probe beam in a strongly driven silicon photonic crystal resonator at room *** effect is based on the oscillating temperature field induced in a nonlinear optical cavity,and it reproduces many of the key features of EIT while being independent of either atomic or mechanical *** thermo-optically induced transparency will allow a versatile implementation of EIT-analogs in an integrated photonic platform,at almost arbitrary wavelength of interest,room temperature and in a practical,low cost,and scalable system.

关键词： temperature transparency oscillating

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