Transmission characterization of fiber Bragg gratings arrays for intracavity spectral control of a 1.5 micrometer fiber laser

Abstract: This thesis aims to investigate whether a fiber Bragg grating array (FBGA) can be designed to reduce the bandwidth of light from a 1.5 µm fiber laser while the distances between the fiber Bragg gratings are in the 10-20 cm range. The results from simulations show that for FBGA with multiple cavities, small changes in cavity length impact transmission drastically. For FBGA consisting of only two fiber Bragg gratings, the quality of the laser cavity's spectrum is improved, as the peak width is reduced and stability is increased. The conclusions of the experiments and the simulations are that FBGA with a single cavity gives best performance. For future studies, if higher computational power and production capabilities are available, an in depth analysis of a multi cavity FBGA could be conducted.