FBG stretching mechanism with integrated thermal compensation
US6498891B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2001 |
| Grant date | Dec 24, 2002 |
| Priority date | — |
| Expiry date | Aug 8, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02209
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Temperature compensated fiber stretching is accomplished by amplifying with a unique flexure the relative displacement between a rigid frame and a longitudinal spacing element. For passive compensation, relative displacement results from differential thermal expansion between the frame and the longitudinal spacer. For active thermal compensation and/or for wavelength tuning of an embedded fiber Bragg grating, relative displacement results from combining differential thermal expansion with active feedback length control of the longitudinal spacer. The feedback control can stabilize using length feedback from a displacement sensor or actively control length using temperature feedback, including logic elements, for example algorithms or look up tables. In an optical system, combined passive compensation and active control with flexure amplification provide superior thermal wavelength stability and tuning range. In some embodiments, the rigid frame and the flexure are of the same material and can be formed as a single monolithic piece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.