Download or read book Tunable Micro-cavities in Photonic Band-gap Yarns and Optical Fibers written by Gilles Benoit (Ph. D.) and published by . This book was released on 2006 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) We demonstrate that the resonance wavelength of Fabry-Perot cavities embedded in reflecting fibers can be tuned reversibly under applied elastic strain or external illumination at 514 nm. A simple opto-mechanical model is developed to assess the mechanical tuning efficiency while a review of the photodarkening effect in chalcogenide glasses and accurate measurements of the amplitude and response time associated with its transient component are presented to explain and optimize the optical tuning scheme. Modulation of the fibers' reflectivity near their cavity resonant wavelengths is demonstrated at various frequencies. Based on these results, we show that optical micro-cavities in transmission fibers can induce very high group-velocity dispersion as a result of the interaction between the propagating core modes and the lossy cavity resonant mode(s). Widely tunable dispersion is achieved using a mechanical tuning scheme. Applications for these fibers and future research directions are envisioned.