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Enhancement of Brillouin Scattering Signal in Perfluorinated Graded-Index Polymer Optical Fibers
Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
* Author to whom correspondence should be addressed.
Received: 26 December 2011; in revised form: 18 January 2012 / Accepted: 20 January 2012 / Published: 31 January 2012
Abstract: Perfluorinated graded-index polymer optical fibers (PFGI-POFs), fabricated by replacing the hydrogen atoms of standard polymethyl methacrylate-based POFs with fluorine atoms, have been extensively studied due to their relatively low propagation loss even at telecommunication wavelength. Recently, Brillouin scattering, which is one of the most significant nonlinear effects in optical fibers, has been successfully observed in PFGI-POFs at 1.55-μm wavelength. The Brillouin Stokes signal was, however, not large enough for practical applications or for detailed investigations of the Brillouin properties. In this paper, we review our recent work on Stokes signal enhancement. First, we induce stimulated Brillouin scattering based on the so-called pump-probe technique, and discuss its applicability to temperature sensors. Then, we investigate the influence of the core diameter and length of PFGI-POFs on Stokes signal, and observe the Brillouin linewidth narrowing effect. We believe our work is an important technological step toward the implementation of practical Brillouin-based devices and systems including distributed strain and temperature sensors.
Keywords: Brillouin scattering; Brillouin gain spectrum; perfluorinated graded-index polymer optical fiber; pump-probe technique; fiber-optic sensing; distributed temperature sensing; nonlinear optics
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MDPI and ACS Style
Mizuno, Y.; Nakamura, K. Enhancement of Brillouin Scattering Signal in Perfluorinated Graded-Index Polymer Optical Fibers. Appl. Sci. 2012, 2, 46-60.
Mizuno Y, Nakamura K. Enhancement of Brillouin Scattering Signal in Perfluorinated Graded-Index Polymer Optical Fibers. Applied Sciences. 2012; 2(1):46-60.
Mizuno, Yosuke; Nakamura, Kentaro. 2012. "Enhancement of Brillouin Scattering Signal in Perfluorinated Graded-Index Polymer Optical Fibers." Appl. Sci. 2, no. 1: 46-60.