Gui Chengcheng, Li Chao, Yang Qi, Wang Jian
Opt Express. 2015 Apr 20;23(8):9736-45. doi: 10.1364/OE.23.009736.
We design and fabricate silicon vertical slot waveguides for terabit-scale data transmission. The designed silicon photonic device is composed of apodized grating couplers, strip waveguides, strip-to-slot/slot-to-strip mode converters, and slot waveguide. Tight light confinement in the nano-scale air slot region is achieved in the silicon vertical slot waveguide which features relatively lower nonlinearity compared to silicon strip waveguide. Using the fabricated silicon photonic devices, we first demonstrate ultra-wide bandwidth 1.8-Tbit/s data transmission through a 2-mm-long silicon vertical slot waveguide using 161 wavelength-division multiplexing (WDM) channels each carrying 11.2-Gbit/s orthogonal frequency-division multiplexing (OFDM) 16-ary quadrature amplitude modulation (16-QAM) signal. All 161 WDM channels achieve bit-error rate (BER) less than 1e-3 after on-chip data transmission. We further demonstrate terabit-scale data transmission through four silicon vertical slot waveguides with different lengths (1 mm, 2 mm, 3.1 mm, 12.2 mm). The optical signal-to-noise ratio (OSNR) penalties of data transmission through four silicon vertical slot waveguides are 1, 2, 3.2 and 4.5 dB at a BER of 1e-3, respectively. The obtained results indicate that the presented silicon vertical slot waveguide might be an alternative promising candidate facilitating chip-scale high-speed optical interconnections.
我们设计并制造了用于太比特级数据传输的硅垂直槽波导。所设计的硅光子器件由切趾光栅耦合器、条形波导、条形-槽形/槽形-条形模式转换器以及槽波导组成。在硅垂直槽波导中，纳米级空气槽区域实现了紧密的光限制，与硅条形波导相比，其非线性相对较低。利用所制造的硅光子器件，我们首先通过一个2毫米长的硅垂直槽波导，使用161个波长 division multiplexing（WDM）信道，每个信道承载11.2-Gbit/s正交频分复用（OFDM）16进制正交幅度调制（16-QAM）信号，演示了超宽带宽1.8-Tbit/s数据传输。在片上数据传输后，所有161个WDM信道的误码率（BER）均小于1e-3。我们进一步演示了通过四个不同长度（1毫米、2毫米、3.1毫米、12.2毫米）的硅垂直槽波导进行太比特级数据传输。在误码率为1e-3时，通过四个硅垂直槽波导进行数据传输的光信噪比（OSNR）代价分别为1、2、3.2和4.5 dB。所获得的结果表明，所提出的硅垂直槽波导可能是促进芯片级高速光互连的一个有前途的替代候选方案。
