Journal
PHOTONICS RESEARCH
Volume 8, Issue 4, Pages 457-467Publisher
CHINESE LASER PRESS
DOI: 10.1364/PRJ.382620
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Funding
- European Commission (H2020 QuantERA ERA-NET Cofund QT project CUSPIDOR) [H2020-ICT27-2015, 688516 COSMICC]
- Ministero dell'Istruzione, dell'Universita e della Ricerca
- Science Foundation Ireland [17/QERA/3472, 12/RC/2276_P2]
- CINECA-ISCRA (Project SlowMod) [HP10C0BQ66]
- Science Foundation Ireland (SFI) [17/QERA/3472] Funding Source: Science Foundation Ireland (SFI)
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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. (C) 2020 Chinese Laser Press
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