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Appl Opt. 2018 Nov 1;57(31):9351-9356. doi: 10.1364/AO.57.009351.

Energy attenuations in single microfiber and double-loop cavity supported by optical substrate.


We report on the characterization of energy losses in single-silica microfiber and double-loop microcavity deposited on MgF2 substrate. When the bending radius is less than ∼37  μm, the bending loss rate of a 1.4 μm diameter microfiber exceeds its propagation loss (∼0.039  dB/μm), which becomes the main source of energy attenuation. Furthermore, we measured the transmission energy losses during the assembling process of a double-loop cavity. The transmission loss in a double-loop cavity varies by adjusting the shape of the cavity. It is also found that a ∼30  μm radius cavity has a similar bending loss to that of a curved microfiber with the two bending radii of ∼60  μm, which demonstrates that the cavity can provide a more compact structure than a curved microfiber in integrated photonic circuits. By further bending the input end of a cavity, the output energy can be greatly attenuated, which indicates that the double-loop cavity is no longer suitable for integration.


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