Solar pumped laser (SPL) can find wide applications in space missions, especially for long lasting ones. In this paper a new technological approach for the realization of a SPL based on fiber laser technology is proposed. We present a preliminary study, focused on the active material performance evaluation, towards the realization of a Nd<sup>3+</sup> -doped fiber laser made of phosphate glass materials, emitting at 1.06 μm. For this research several Nd<sup>3+</sup> -doped phosphate glass samples were fabricated, with concentration of Nd<sup>3+</sup> up to 10 mol%. Physical and thermal properties of the glasses were measured and their spectroscopic properties are described. The effect of Nd<sup>3+</sup> doping concentration on emission spectra and lifetimes was investigated in order to study the concentration quenching effect on luminescence performance.
The mid-IR spectral range is of particular interest for two main reasons: many molecules exhibit signature optical absorptions in this wavelength range and specific transmission windows within these wavelengths are available in the Earth’s atmosphere. Options for compact, reliable, high power mid-IR optical sources are currently rather limited by the difficulty of finding host materials that are both transparent in the mid-IR wavelengths range and sufficiently stable, robust and easy to fabricate. In this paper the relevant glass host materials suitable for the development of mid-IR coherent sources based on rare earths doping are briefly reviewed. The current state of the art in mid-IR fiber laser and supercontinuum sources is also presented.
A Yb-doped phosphate glass double cladding optical fiber was prepared using a custom designed glass composition (P<sub>2</sub>O<sub>5</sub> - Al<sub>2</sub>O<sub>3</sub> - Li<sub>2</sub>O - B<sub>2</sub>O<sub>3</sub> - BaO - PbO - La<sub>2</sub>O<sub>3</sub>) for high-power amplifier and laser applications. The preform drawing method was followed, with the preform being fabricated using the rotational casting technique. This technique, previously developed for tellurite, fluoride or chalcogenide glass preforms is reported for the first time using rare earth doped phosphate glasses. The main challenge was to design an adequate numerical aperture between first and second cladding while maintaining similar thermo-mechanical properties in view of the fiber drawing process. The preform used for the fiber drawing was produced by rod-in-tube technique at a rotation speed of 3000 rpm. The rotational casting technique allowed the manufacturing of an optical fiber featuring high quality interfaces between core and internal cladding and between the internal and external cladding, respectively. Loss attenuation was measured using the cut-back method and lasing was demonstrated at 1022 nm by core pumping with a fiber pigtailed laser diode at the wavelength of 976 nm.
Poly-Methyl-MethAcrilate based optical fibers with Step-Index profile and 1 mm core diameter (PMMA-SI-POF) are
widely deployed in automobile infotainment systems thanks to the MOST standards that adopt them as the preferred
physical medium. However, thanks to their mechanical robustness and tolerance and their ease of installation, they make
a suitable medium for local networking. Unfortunately, their good mechanical characteristics have to be paid in terms of
performances, since PMMA-SI-POF based systems are severely limited in both bandwidth and attenuation. We will
present a review of the best research results that have been obtained at the different speeds that are defined by the
Ethernet standard: 10 Mb/s, 100 Mb/s and 1 Gb/s, showing that PMMA-SI-POF can easily overcome copper
performances while being smaller, cheaper, easier to install in brownfield environment. To date, the following results
have been obtained: 425 m at 10 Mb/s, 275 m at 100 Mb/s and 75 m at 1 Gb/s; these results have been obtained with
commercial eye-safe components, and we believe that overcoming them requires in most cases the development of a new
class of components.
An overview of the different modulation formats that have been adopted, the most suitable equalization techniques and
the best affordable components will be given. In the end, an overview of the current commercial systems performances
and the road standardization procedures are taking will be given.
In this paper we wish to introduce the FABULOUS European Project, started on the 1st of October 2012, that proposes a
new FDMA-PON architecture adopting Faraday rotation and a R-ONU based on a reflective modulator instead of the
conventional reflective SOA, designed on purpose and to be realized in silicon photonics, in order to cope with the target
performances set by FSAN and the need of realizing low cost devices for the final user.
Conference Committee Involvement (1)
Workshop on Photonic Components for Broadband Communication