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We present a compact highly sensitive microfiber coupler-based twist sensor formed by fusing and tapering two optical fibers and then connecting two of the pigtails to form a Sagnac loop. The device is miniature, low cost, and easily fabricated. The sensor has high twist sensitivities of $\sim 0.9$ nm/° when measuring wavelength shift and $\sim 0.16$ dB/° when measuring transmission power, both...
In this paper, we demonstrate one kind of fibre-optic device — microfiber coupler (MFC). Spectral response to the micro-force axially is recorded in the experiment. Besides, utilizing the home-made MFC, we propose a high-sensitivity Ampere force based magnetic field meter. We believe more applications in mechanics of the MFC will appear in the near future.
In this paper, we demonstrate a compact Sagnac loop based on microfiber coupler which has a potential in application of laser, communication and sensing. As an example, a thermometer based on this structure is fabricated and shows a good temperature sensitivity.
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