Bekele Dagmawi A, Yu Yi, Hu Hao, Guan Pengyu, Ottaviano Luisa, Galili Michael, Oxenløwe Leif Katsuo, Yvind Kresten, Mork Jesper
Opt Lett. 2018 Feb 15;43(4):955-958. doi: 10.1364/OL.43.000955.
We experimentally demonstrate the use of a photonic crystal Fano resonance for carving-out short pulses from long-duration input pulses. This is achieved by exploiting an asymmetric Fano resonance combined with carrier-induced nonlinear effects in a photonic crystal membrane structure. The use of a nanocavity concentrates the input field to a very small volume leading to an efficient nonlinear resonance shift that carves a short pulse out of the input pulse. Here, we demonstrate shortening of ∼500 ps and ∼100 ps long pulses to ∼30 ps and ∼20 ps pulses, respectively. Furthermore, we demonstrate error-free low duty cycle return-to-zero signal generation at 2 Gbit/s with energy consumption down to ∼1 pJ/bit and power penalty of ∼2 dB. The device physics and limitations are analyzed using nonlinear coupled-mode theory.
我们通过实验证明了利用光子晶体法诺共振从长持续时间的输入脉冲中切出短脉冲。这是通过在光子晶体膜结构中利用不对称法诺共振并结合载流子诱导的非线性效应来实现的。纳米腔的使用将输入场集中到非常小的体积，导致有效的非线性共振偏移，从而从输入脉冲中切出短脉冲。在此，我们展示了分别将约500 ps和约100 ps的长脉冲缩短至约30 ps和约20 ps的脉冲。此外，我们展示了在2 Gbit/s下无差错的低占空比归零信号生成，能耗低至约1 pJ/bit，功率代价约为2 dB。使用非线性耦合模理论对器件物理和局限性进行了分析。
