Photo induced refractive index changes in two-mode elliptical core fibers: Applications

Ashish M. Vengsarkar; Jonathan A. Greene; Kent A. Murphy

doi:10.1117/12.637004

16 December 1992 Photo induced refractive index changes in two-mode elliptical core fibers: Applications

Ashish M. Vengsarkar, Jonathan A. Greene, Kent A. Murphy

Proceedings Volume 1622, Emerging Optoelectronic Technologies; (1992) https://doi.org/10.1117/12.637004
Event: Emerging OE Technologies, Bangalore, India, 1991, Bangalore, India

Abstract

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.

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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); https://doi.org/10.1117/12.637004

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