The performance of the magnesium fluoride/chromium/gold in-line fiber optic polarizer on the thickness of magnesium fluoride buffer layer and chromium metal thin film was theoretically investigated. To prove the theoretical study, the magnesium fluoride/chromium/gold polarizer was made based on the simulation results. The obtained polarizer showed an extinction ratio of about 40 dB which is in a good agreement with the theoretical result at the corresponding thicknesses. Both theoretical and experimental results showed that by covering the side polished single mode fiber with the optimum layer thicknesses, a novel and an efficient fiber polarizer with the high extinction ratio could be obtained. This is the first time that this type of polarizer has been made.

In this paper the group delay dispersion (GDD) of some laser mirrors is measured by a Gires-Tournois interferometer (GTI). The GTI is constructed with a partially reflective nondispersive mirror and a highly reflective dispersive mirror. The GDD of the dispersive mirrors is calculated by determining the spectral position of the minima in the reflection light of the GTI. The previous GDD measurement equation is modified by introducing a correction coefficient. An appropriate level of accuracy is obtained by optimizing the Gires-Tournois mirror distances in our simple and inexpensive practical setup.