Abstract

We report on the characterization of energy losses in single-silica microfiber and double-loop microcavity deposited on ${\mathrm{MgF}}_2$ substrate. When the bending radius is less than $\sim 37\mathrm{\mu m}$, the bending loss rate of a 1.4 μm diameter microfiber exceeds its propagation loss ($\sim 0.039\mathrm{dB}/\mathrm{\mu m}$), 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 $\sim 30\mathrm{\mu m}$ radius cavity has a similar bending loss to that of a curved microfiber with the two bending radii of $\sim 60\mathrm{\mu m}$, 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.

© 2018 Optical Society of America

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