Abstract
We describe the design, fabrication, and performance of a fiber Bragg grating-based tunable optic filter. The filter, driven by two piezostacks, consists of a flexural hinge structure for displacement magnification and a fiber-ferrule assembly for axial compression of the fiber grating. Finite-element analysis was used to design the mechanical structure to achieve the required displacement magnification and the force for grating compression. A passive thermal compensation design was implemented to reduce thermal-induced wavelength drift. A feedback control system with a linear variable differential transformer was employed to control the displacement for accurate wavelength tuning and fine-tuning resolution. This tunable filter has achieved a closed-loop switching time of , and a passive thermal compensation that reduced the thermal drift of the Bragg wavelength to . The flexural-hinge structure that offers negligible backlash, noise-free motion, no need of lubricants, and no wear ensures its long-term reliability.
© 2006 Optical Society of America
Full Article | PDF ArticleMore Like This
E. Bélanger, M. Bernier, J. P. Bérubé, S. Gagnon, D. Côté, and R. Vallée
Appl. Opt. 47(5) 652-655 (2008)
Yi Qiao, Yi Zhou, and Sridhar Krishnaswamy
Appl. Opt. 45(21) 5132-5142 (2006)
Dong Ning Wang and Ming Fai Lim
Appl. Opt. 43(20) 4106-4109 (2004)