We present a hybrid graphene–silicon waveguide, which consists of a lateral slot waveguide with three layers of graphene flakes inside. Through a theoretical analysis, an effective index variation for about 0.05 is found in the waveguide by applying a voltage on the graphene. We designed a Mach–Zehnder modulator based on this waveguide and demonstrated it can process signals nearly chirp-free. The calculation shows that the driving voltage is only 1 V even if the length of the arm is shortened to be 43.54 μm. An extinction up to 34.7 dB and a minimum chirp parameter of are obtained. Its insertion loss is roughly . This modulator consumes low power and has a small footprint. It can potentially be ultrafast as well as CMOS compatible.
© 2013 Optical Society of AmericaFull Article | PDF Article
Zhaolin Lu and Wangshi Zhao
J. Opt. Soc. Am. B 29(6) 1490-1496 (2012)
Joerg Pfeifle, Luca Alloatti, Wolfgang Freude, Juerg Leuthold, and Christian Koos
Opt. Express 20(14) 15359-15376 (2012)
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