Photonics Research, 2020, 8 (4): 04000457, Published Online: Mar. 12, 2020  

Optimizing an interleaved p-n junction to reduce energy dissipation in silicon slow-light modulators Download: 513次

Author Affiliations
1 Department of Physics, University of Pavia, 27100 Pavia, Italy
2 Centre for Advanced Photonics and Process Analysis, Cork Institute of Technology, Cork, Ireland
3 Tyndall National Institute, Cork, Ireland
4 Institute for Photonics and Nanotechnologies (IFN)-CNR, 20133 Milano, Italy
Abstract
Reducing power dissipation in electro-optic modulators is a key step for widespread application of silicon photonics to optical communication. In 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 axis. After 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 bit. Comparison 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 regions. As a surprising result, the modulator performance is improved over an optical bandwidth that is much wider than the slow-light bandwidth.

Marco Passoni, Dario Gerace, Liam O’Faolain, Lucio Claudio Andreani. Optimizing an interleaved p-n junction to reduce energy dissipation in silicon slow-light modulators[J]. Photonics Research, 2020, 8(4): 04000457.

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