Photonic fiber laser

Abstract

Fiber optic lasers based on erbium doped fibers have been the subject of research for many years, and are still gaining in interest due to their possible applications. Fiber optic lasers present many more advantages than semiconductor lasers. This work demonstrates the construction of fiber optic lasers based on PM (polarization maintaining) erbium ion doped photonic fiber as well as the spectra generated by the lasers. Several laser configurations especially line and ring resonators have been presented. The main purpose of this work was to build a laser with optimal spectral properties for use in the WDM (wavelength division multiplexing) transmission. In order to obtain proper single wave signal spectra in the built lasers, FBG (Fiber Bragg Grating) fiber optic filters have been used. Lasers with multi-wavelength spectra generated have been built as well. In addition, there have been constructed lasers where a polarizer has been used in the resonator circuit as an element generating laser's single wave spectrum. Tuning within a few nanometers was obtained in this laser by means of propagated signal polarization change. The proposed solutions of a single- and multi-wavelength laser allow us to create the WDM-based system which requires the application of laser source of strictly defined spectral parameters. Full Text: PDF