Abstract
Long period gratings (LPGs) were written into a D-shaped single-mode fiber. These LPGs were subjected to a range of curvatures, and it was found that as curvature increased, there was increasingly strong coupling to certain higher order cladding modes without the usual splitting of the LPGs stopbands. A bend-induced stopband yielded a spectral sensitivity of 12.55 nm · m for curvature and 2.2 × 10-2 nm°C-1 for temperature. It was also found that the wavelength separation between adjacent bend-induced stopbands varied linearly as a function of curvature. Blue and red wavelength shifts of the stopbands were observed as the sensor was rotated around a fixed axis for a given curvature; thus, in principle, this sensor could be used to obtain bending and orientational information. The behavior of the stopbands was successfully modeled using a finite element approach.
| Original language | English |
|---|---|
| Pages (from-to) | 130-135 |
| Number of pages | 6 |
| Journal | IEEE Transactions on Instrumentation and Measurement |
| Volume | 53 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Feb 2004 |
Bibliographical note
© 2004 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Keywords
- curvature measurement
- d-shaped optical fiber
- long-period fiber gratings
- optical fiber devices
- temperature measurement