source: © 2007 Optical Society of America
We demonstrate a novel method that enables one to measure the structure of highly reflecting fiber Bragg gratings. The method is based on measuring both the transmission and reflection spectra of the grating and applying an inverse-scattering algorithm. The use of the transmission spectrum significantly reduces the sensitivity of the reconstruction to measurement noise, and therefore it significantly decreases the measurement duration. We experimentally demonstrate our method for reconstructing the structure of an apodized grating with a reflectivity of 99.91%. Â [Read more…]
Fig. 1 Schematic description of experimental setup used for measuring structure of strong FBGs. FBG is the interrogated fiber Bragg grating and M is a mirror. The intensity transmission spectrum and the interference spectrum between a reflection from the grating and a reference signal, obtained by using a mirror, are measured.