Chen Shaowu, Zhang Libin, Fei Yonghao, Cao Tongtong
State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
Opt Express. 2012 Mar 26;20(7):7454-68. doi: 10.1364/OE.20.007454.
Bistability (BS) and self-pulsation (SP) phenomena in silicon microring resonators (MRR) with intense CW light injection are studied. Several nonlinear optical effects including Kerr effect, two-photon absorption, free carrier absorption and free carrier dispersion are taken into account. The threshold optical intensity of BS and SP is derived from the coupled mode theory and a linear stability analysis method. The influences of MRR's parameters (carrier lifetime, linear loss and radius) and light injection conditions (input power, wavelength detuning) on the characteristics of SP (modulation depth and oscillating frequency) are analyzed and discussed. It is shown that, SP occurs only if the carrier lifetime ranges from several ps to several-hundred ps and the input light intensity is higher than 10⁶W/cm². The modulation depth of SP can be as large as 8dB and the associated oscillating frequency is in the range from several GHz to beyond 10 GHz.
研究了在强连续波光注入下硅微环谐振器（MRR）中的双稳态（BS）和自脉动（SP）现象。考虑了包括克尔效应、双光子吸收、自由载流子吸收和自由载流子色散在内的几种非线性光学效应。双稳态和自脉动的阈值光强由耦合模理论和线性稳定性分析方法推导得出。分析并讨论了微环谐振器的参数（载流子寿命、线性损耗和半径）以及光注入条件（输入功率、波长失谐）对自脉动特性（调制深度和振荡频率）的影响。结果表明，只有当载流子寿命在几皮秒到几百皮秒范围内且输入光强高于10⁶W/cm²时才会出现自脉动。自脉动的调制深度可达8dB，相关的振荡频率在几吉赫兹到超过10吉赫兹的范围内。
