Husko C, Vo T D, Corcoran B, Li J, Krauss T F, Eggleton B J
Centre for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), Institute of Photonics and Optical Science (IPOS), School of Physics, University of Sydney, NSW 2006, Australia.
Opt Express. 2011 Oct 10;19(21):20681-90. doi: 10.1364/OE.19.020681.
We demonstrate an ultracompact, chip-based, all-optical exclusive-OR (XOR) logic gate via slow-light enhanced four-wave mixing (FWM) in a silicon photonic crystal waveguide (PhCWG). We achieve error-free operation (<10⁻⁹) for 40 Gbit/s differential phase-shift keying (DPSK) signals with a 2.8 dB power penalty. Slowing the light to vg = c/32 enables a FWM conversion efficiency, η, of -30 dB for a 396 μm device. The nonlinear FWM process is enhanced by 20 dB compared to a relatively fast mode of vg = c/5. The XOR operation requires ≈ 41 mW, corresponding to a switching energy of 1 pJ/bit. We compare the slow-light PhCWG device performance with experimentally demonstrated XOR DPSK logic gates in other platforms and discuss scaling the device operation to higher bit-rates. The ultracompact structure suggests the potential for device integration.
我们通过硅光子晶体波导（PhCWG）中的慢光增强四波混频（FWM）展示了一种超紧凑、基于芯片的全光异或（XOR）逻辑门。对于40 Gbit/s差分相移键控（DPSK）信号，我们实现了无误码操作（<10⁻⁹），功率代价为2.8 dB。将光减慢至群速度vg = c/32，对于一个396μm的器件，FWM转换效率η达到了-30 dB。与群速度vg = c/5的相对较快模式相比，非线性FWM过程增强了20 dB。异或操作需要约41 mW，对应于1 pJ/bit的开关能量。我们将慢光PhCWG器件的性能与其他平台上实验展示的异或DPSK逻辑门进行了比较，并讨论了将器件操作扩展到更高比特率的问题。这种超紧凑结构表明了器件集成的潜力。
