Share Email Print
cover

Proceedings Paper

Tunable fiber Bragg grating ring lasers using macro fiber composite actuators
Author(s): Demetris L. Geddis; Sidney G. Allison; Qamar A. Shams
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The research reported herein includes the fabrication of a tunable optical fiber Bragg grating (FBG) fiber ring laser (FRL)1 from commercially available components as a high-speed alternative tunable laser source for NASA Langley's optical frequency domain reflectometer (OFDR) interrogator, which reads low reflectivity FBG sensors. A Macro-Fiber Composite (MFC) actuator invented at NASA Langley Research Center (LaRC) was selected to tune the laser. MFC actuators use a piezoelectric sheet cut into uniaxially aligned rectangular piezo-fibers surrounded by a polymer matrix and incorporate interdigitated electrodes to deliver electric fields along the length of the piezo-fibers. This configuration enables MFC actuators to produce displacements larger than the original uncut piezoelectric sheet. The FBG filter was sandwiched between two MFC actuators, and when strained, produced approximately 3.62 nm of wavelength shift in the FRL when biasing the MFC actuators from -500 V to 2000 V. This tunability range is comparable to that of other tunable lasers and is adequate for interrogating FBG sensors using OFDR technology. Three different FRL configurations were studied. Configuration A examined the importance of erbium-doped fiber length and output coupling. Configuration B demonstrated the importance of the FBG filter. Configuration C added an output coupler to increase the output power and to isolate the filter. Only configuration C was tuned because it offered the best optical power output of the three configurations. Use of Plastic Optical Fiber (POF) FBG's holds promise for enhanced tunability in future research.

Paper Details

Date Published: 19 October 2006
PDF: 10 pages
Proc. SPIE 6371, Photonic Sensing Technologies, 637101 (19 October 2006); doi: 10.1117/12.684181
Show Author Affiliations
Demetris L. Geddis, Norfolk State Univ. (United States)
Sidney G. Allison, NASA Langley Research Ctr. (United States)
Qamar A. Shams, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 6371:
Photonic Sensing Technologies
Michael A. Marcus; Brian Culshaw; John P. Dakin, Editor(s)

© SPIE. Terms of Use
Back to Top