
01:19:06
03 2007
Light from rare earths for optical telecom systems
Edited by: Institute of applied physics "Nello Carrara" - IFAC
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The researchers in the Optoelectronic Technologies Laboratory of IFAC have a great expertise in the development of integrated optical components and devices, and since a few years " also thanks to the participation in European ESPRIT and ACTS projects " they have started to investigate rare-earth-doped glasses, and Erbium-doped glasses in particular, to achieve optical amplification.
In the frame of an international collaborative network (including several CNR and Italian Universities’ groups; University of Nottingham; INESC, Lisbon; Optical Science Center, Tucson; Vavilov Optical Institute, St. Petersburg) it has been possible to synthesize and characterize a series of novel glasses, all containing Erbium, but based on different oxide formers. Thus, silicates, phosphates and tellurites (i.e. glasses based on tellurium oxide) have been produced, and optical waveguides were fabricated in these glasses. The main aim was to combine the property of high transparency (low propagation loss) with intense emission (high quantum efficiency). The results achieved so far by the research group are quite promising, and an optical amplifier with a net optical gain of 1,5 dB/cm (i.e. light intensity is doubled after 2 cm propagation length) using a pump diode at 980 nm was demonstrated. The group is now working, under an Italian FIRB project, with the aim of developing integrated optical lasers and amplifiers in tellurite glasses, which exhibit a bandwidth almost three times wider than silicate glasses.
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