Journal
OPTICS LETTERS
Volume 42, Issue 1, Pages 167-170Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.42.000167
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Funding
- National Natural Science Foundation of China (NSFC) [61475029, 61520106012, 61635004]
- Key Research and Development Project of Ministry of Science and Technology of the People's Republic of China (MOST) [2016YFC0801200]
- Science Fund for Distinguished Young Scholars of Chongqing [CSTC2014JCYJJQ40002]
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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 similar to 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 pi phase shift at the resonant wavelength is introduced to the Mach-Zehnder interferometer. (C) 2016 Optical Society of America
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