Macrobending characteristics of a newly developed hetero-core splicing sensor is investigated from the viewpoint of the practical use intended both for relatively large distortion monitoring and for liquid adhesion detection. The hetero- core sensor can be simply fabricated by fusion splicing of a hetero- core fiber portion as short as approximately 5 mm in length, which is inserted in a typical low-transmission-loss single mode fiber with a 9- μm core diameter for the wavelength of 1.3μm as a fiber network line.
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