Yuan Guohui, Wang Zhuoran
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054, China.
Opt Express. 2013 Apr 22;21(8):9624-35. doi: 10.1364/OE.21.009624.
We investigate mode multistability, i.e. coexistence of direction bistability and wavelength bi/multistability in microring lasers (MRLs) theoretically and numerically. We derive the expressions for conditions required for mode multistable operation in microring lasers based on a nonlinear multimode model with nonlinear effects stemming from carrier density pulsation, carrier heating and spectral hole burning included. We find theoretically that lasing mode can be selected from the multistable modes by external optical injection through gain saturation, and removal of the external optical injection will not affect the stability of the established lasing mode. Numerical results on all-optical multistate flip-flop function demonstrate that switching between multistable modes can be induced by trigger signals with each states self-sustained after the removal of the trigger signals in a 50µm-radius microring laser.
我们从理论和数值上研究了微环激光器（MRL）中的模式多稳定性，即方向双稳性和波长双稳/多稳性的共存。基于包含载流子密度脉动、载流子加热和光谱烧孔等非线性效应的非线性多模模型，我们推导了微环激光器模式多稳运行所需条件的表达式。我们从理论上发现，通过增益饱和的外部光注入可以从多稳模式中选择激射模式，并且去除外部光注入不会影响已建立的激射模式的稳定性。全光多态触发器功能的数值结果表明，在半径为50μm的微环激光器中，触发信号可以诱导多稳模式之间的切换，并且在去除触发信号后每个状态都能自我维持。
