Department of Information Science and Electronics Engineering, Zhejiang University, Hangzhou, China.
Opt Lett. 2013 Jul 15;38(14):2512-5. doi: 10.1364/OL.38.002512.
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 -0.006 are obtained. Its insertion loss is roughly -1.37 dB. This modulator consumes low power and has a small footprint. It can potentially be ultrafast as well as CMOS compatible.
我们提出了一种混合石墨烯-硅波导，它由一个带有三层石墨烯薄片的横向槽波导组成。通过理论分析，在波导上施加电压可以得到约 0.05 的有效折射率变化。我们基于这个波导设计了一个马赫-曾德尔调制器，并证明它可以处理几乎无啁啾的信号。计算表明，即使臂长缩短至 43.54 μm，驱动电压也只有 1 V。我们获得了高达 34.7 dB 的消光比和-0.006 的最小啁啾参数。其插入损耗约为-1.37 dB。这个调制器功耗低，占用空间小。它可能具有超高速和与 CMOS 兼容的特点。
