Angelantonio Gnazzo

Spectroscopic properties of Er3+-doped glasses for the realization of active waveguides by ion-exchange technique

The fabrication of different types of Er3+-doped glasses and the study of their absorption and emission spectra, cross sections, lifetimes, and bandwidths are described. The purpose is to get guidelines for the synthesis of the appropriate glasses to manufacture active planar waveguides. The feasibility of active integrated optical waveguides by ion-exchange on these glasses is also demonstrated, using an Er3--doped soda-lime glass.

Splitter position in a PON-based architecture: a techno-economic analysis

Passive Optical Networks (PONs) are a promising future-proof solution for the broadband access network. A topic to be considered in planning a PON architecture is the position of the branching devices (splitters). Some technical and economical considerations about the splitter location are given in order to evaluate the advantages and the critical issues of the different possibilities.

Improved Analysis and Design of Waveguide Bragg Grating Filters for Wavelength Division Multiplexing Applications

Waveguide Bragg gratings are attracting increased attention as narrow-band filters to separate different channels in closely-spaced wavelength-division-multiplexing (WDM) systems. In fact grating filters directly written into Ge-doped optical fibers are already available and exhibit quite attractive features. However, the added structural flexibility inherent in integrated optical waveguides can offer an even increased variety of device and subsystem architecture and performance.

Effect of the glass composition on the emission band of erbium-doped active fibers

The positive effect of widening the 1.5 micrometers Erbium fluorescence band provided by alumina on germanosilicate core glass of active fibers is partially obtained also in magnesia silica host, but to a lesser extent, while zirconia silica fibers do not exhibit modification of the emission band. Excited state lifetimes, absorption, shape, and width of the band in different glass hosts were measured with the aim to optimize the core glass composition.