Shi Leilei, Zhu Tao, Huang Dongmei, Liang Chuancan, Liu Min, Liang Shibin
Opt Lett. 2017 Jan 1;42(1):167-170. doi: 10.1364/OL.42.000167.
An in-fiber Mach-Zehnder interferometer and sphere whispering gallery mode resonator coupling structure is demonstrated by femtosecond laser micromachining. Asymmetric spectra around the resonant wavelength of the whispering gallery cavities in different coupling states are experimentally observed. An extinction ratio of ∼7 dB and a slope of 117 dB/nm can be achieved in the asymmetric spectrum of the overcoupled whispering gallery cavity, where an additional π phase shift at the resonant wavelength is introduced to the Mach-Zehnder interferometer.
通过飞秒激光微加工展示了一种光纤马赫-曾德尔干涉仪与球形回音壁模式谐振器的耦合结构。实验观察到不同耦合状态下回音壁腔谐振波长附近的非对称光谱。在过耦合回音壁腔的非对称光谱中可实现约7 dB的消光比和117 dB/nm的斜率，其中在谐振波长处向马赫-曾德尔干涉仪引入了额外的π相移。
