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16 December 1992 Photo induced refractive index changes in two-mode elliptical core fibers: Applications
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Proceedings Volume 1622, Emerging Optoelectronic Technologies; (1992)
Event: Emerging OE Technologies, Bangalore, India, 1991, Bangalore, India
Photoinduced refractive-index gratings are shown to affect the differential phase modulation between the LP and LP11 modes copropagating within the core of a germanium-doped (Ge-doped) two-mode elliptical-core (e-core) fiber. The beat length of fibers containing such gratings is shown to vary as a function of strain applied to the fiber leading to a new type of weighted optical fiber sensor whose sensitivity varies as a function of length along the structure to which it is attached or embedded. This novel type of spatially-weighted distributed fiber sensor is shown experimentally to function as an efficient vibration mode filter by enhancing either the first or second mode of a thin cantilever beam. These results support future applications of spatially-weighted/distributed optical fiber sensors for the evaluation and control of vibrating structures. I.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ashish M. Vengsarkar, Jonathan A. Greene, and Kent A. Murphy "Photo induced refractive index changes in two-mode elliptical core fibers: Applications", Proc. SPIE 1622, Emerging Optoelectronic Technologies, (16 December 1992);

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