We describe the production of Bragg gratings at 980 nm in two types of single mode polymer optical fibres. The first
type is based on PMMA (polymethylmethacrylate) with a core of PMMA-PS copolymer with less than 5% PS
(polystyrene). The second type is based on PMMA with the addition of PBzMA (polybenzylmethacrylate) and PEMA
(polyethylmethacrylate) in the core. The success rate of inscribing gratings in the first and second type was 30 and 100%,
respectively. The reflectivity varied from grating to grating. The disappearance of the gratings after a certain period of
time is subject to further investigation.
We present a manufacturing method that produces azimuthally symmetric long period fibre gratings using a TEM<sub>01*</sub>-mode CO<sub>2</sub> laser. The outlay and optimization of the optical system are introduced, and the long period fibre grating
fabrication method is outlined. We also investigated the polarization properties of the fabricated long period fibre
gratings to determine the quality of the grating structures.
We use a figure-eight fibre laser with a photonic crystal fibre NALM (nonlinear amplifying loop mirror) to produce a
moderate supercontinuum from 1440 nm - 1680 nm in highly nonlinear dispersion shifted fibre. We also observe a 743
nm band in the fluorescence of the erbium doped amplifier outside the figure-eight fibre laser.
We present the Nonlinear Optical Loop Mirror (NOLM), the Nonlinear Amplifying Loop Mirror (NALM), a Two - NOLM configuration and a Two - NALM configuration. For all four arrangements the switching equations are derived and computer simulation results are presented. We investigate the switching behavior of two identical NOLM loops and two different NOLM loops in dependence of the length of the nonlinear Kerr fiber, the effective fiber core diameter and the coupling constant α. The same investigations are carried out with two identical NALM loops and two different NALM loops, where additionally the dependence of the gain is considered.