Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 12, Issue 5, Pages 531-533Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/68.841276
Keywords
fiber mode coupling; long-period fiber grating; optical bend sensor; optical sensing; resonance mode splitting
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We report an effective new method of realizing optical bend sensing based on the measurement of bending-curvature encoded resonance mode splitting of long-period fiber grating. The bending induced mode splitting exhibits a near-linear response and the bending sensitivity achieved by this method is nearly four times higher than the previously reported wavelength shift detection method. The evolution of the transmission loss under bending appears dependent on the initial mode coupling strength.
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