Abstract
This paper deals with fabrication of an optical microfiber and demonstration of a Sagnac loop interferometer constructed with it. An optical microfiber with a diameter ∼2 µm and loss ∼0.03 dB/mm is manufactured by tapering a conventional single-mode fiber using a flame-brushing technique. A Sagnac interferometer is assembled by twisting the fabricated microfiber into a loop. The intertwisted section of the loop functions as a directional coupler whose coupling ratio is tunable by changing the twist rate. Transmission characteristics of the interferometer may allow us to use it as a potential photonic device such as a linear edge filter, an optical variable attenuator, or a gain flattening filter.
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