Showing papers by "Leilei Shi published in 2017"
TL;DR: An in-fiber Mach-Zehnder interferometer and sphere whispering gallery mode resonator coupling structure is demonstrated by femtosecond laser micromachining and asymmetric spectra around the resonant wavelength of the whispering gallery cavities in different coupling states are experimentally observed.
Abstract: 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.
16 citations
TL;DR: In this paper, the authors demonstrate a very simple electrically assisted technique for broad-range tuning of whispering gallery modes in microtube resonator, which is fabricated by embedding a FeCrAl heating wire with small resistance into a tapered silica microtube.
Abstract: We demonstrate a very simple electrically assisted technique for broad-range tuning of whispering gallery modes in microtube resonator, which is fabricated by embedding a FeCrAl heating wire with small resistance into a tapered silica microtube. The huge Joule heat generated by the heating wire can be effectively and thermally conducted to the microtube and consequently changes the path of the optical whispering gallery modes due to the thermo-optic effect. Experimental results show that such a device has a tuning range of 0.57 nm with excellent stability under the applied current of 200 mA, fast response (<100 ms), and low power consumption (~0.1 mW). This makes it to have potentials in tunable filters or fast optical switches.
4 citations