12 June 2000 Brillouin-active fibers for optical sensing, logic, and computation in smart structures
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We have studied stimulated Brillouin scattering in single-mode optical fibers as a sensor for both temperature and strain. Shape Memory alloy Nitinol is also studied for enhancement of active sensing and control in structures. We have introduced the hybrid sBs amplifier/oscillator scheme, in which the short fiber amplifier performs sensing and the long oscillator fiber provides the required signal. The sensing fiber can be coated with SMA thin film for ruggedness, increased sBs sensitivity to temperature and strain, and memory or trainability. The oscillator/amplifier scheme also serves as a building block in the design of optical threshold logic circuits, optical computation, and more sophisticated sensing schemes. Such sensing schemes can be highly competitive with those based on fiber Bragg grating. The incorporation of SMA thin films provides memory capability to all these applications.
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Chung Yu, Yongkab Kim, and Justin Foreman "Brillouin-active fibers for optical sensing, logic, and computation in smart structures", Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000); doi: 10.1117/12.388143; https://doi.org/10.1117/12.388143

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