Title :
A Compact All-Fiber LPG-AOTF Frequency Shifter on Single-Mode Fiber and Its Application to Vibration Measurement
Author :
Chan, Hon M. ; Huang, Rong ; Alhassen, Fares ; Finch, Owen ; Tomov, Ivan V. ; Park, Chang-Soo ; Lee, Henry P.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Irvine, CA
Abstract :
We demonstrate a compact, all-fiber frequency shifter by cascading a CO2-written long-period grating with a flexural acoustic-wave-induced microbending grating on a single-mode fiber. Carrier and image sideband suppressions of 30.0 and 28.1 dB, respectively, are measured. An all-fiber vibrometer based on this frequency shifter capable of nanometer resolution at frequencies up to megahertz is also demonstrated.
Keywords :
acousto-optical filters; diffraction gratings; elastic waves; fibre optic sensors; optical tuning; vibration measurement; acoustooptic tunable filter; all-fiber LPG-AOTF frequency shifter; all-fiber vibrometer; carrier sideband suppression; flexural acoustic-wave-induced microbending grating; image sideband suppression; long-period grating; nanometer resolution; single-mode fiber; vibration measurement; Fiber gratings; Frequency; Optical coupling; Optical fiber couplers; Optical fibers; Optical filters; Optical interferometry; Optical mixing; Vibration measurement; Vibrometers; Acoustooptic tunable filter (AOTF); frequency shifter; long-period grating (LPG); vibration measurement;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2008.928845
