Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 15, Issue 8, Pages 1129-1131Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2003.815338
Keywords
finite-difference beam-propagation method (FDBPM); linearly polarized modes; multimode interference; reimaging theory
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A new concept for a multimode interference-based fiber-optic displacement sensor is investigated both theoretically and experimentally. By applying multimode interference and reimaging theory to optical fibers, a displacement sensor consisting of only a section of multimode fiber fusion spliced to a single-mode fiber can be readily fabricated. Observation and analysis of the power reflected off of a surface and back through the device over a finite wavelength range provides enough information to use the device as a calibrated displacement sensor over a large displacement range.
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