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基于光通信系统对于全光调制和全光开关等的需求,从理论上和实验上研究了拉曼增益对回音壁模式光学微腔系统共振模式的全光调制。理论分析表明,拉曼增益能够补偿回音壁模式光学微腔系统的损耗,进而改变微腔系统的耦合机制,在不对微腔系统做任何机械性移动的前提下实现对系统共振透射率的连续调制。实验中采用光纤锥耦合的二氧化硅微芯圆环腔,利用560μW的低功率泵浦光引发的拉曼散射,波长为1 545.7 nm的信号光实现了13.5 d B的调制度,使得系统的耦合机制由欠耦合转化为临界耦合。
Based on the requirements of all-optical modulation and all-optical switch in optical communication system, the all-optical modulation of Raman gain on the resonant mode of the echo wall mode optical microcavity system is theoretically and experimentally studied. Theoretical analysis shows that the Raman gain can compensate the loss of the whispering gallery mode optical microcavity system, and then change the coupling mechanism of the microcavity system. The system can achieve continuous modulation of the system resonance transmittance without any mechanical movement of the microcavity system . In this experiment, the optical fiber cone-coupled silica micro-core toroidal cavity was used, the Raman scattering caused by the low power pump light of 560μW and the modulation of 13.5 d B was realized by the signal light with the wavelength of 1 545.7 nm, The coupling mechanism transforms from undercooling to critical coupling.