L. Agazzi
University of Twente
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by L. Agazzi.
IEEE Photonics Technology Letters | 2010
J. Bradley; Remco Stoffer; Arjen Bakker; L. Agazzi; Feridun Ay; Kerstin Worhoff; Markus Pollnau
A combined planar lossless optical amplifier and 1 × 2 power splitter device has been realized in Al2O3:Er3+ on silicon. Net internal gain was measured over a wavelength range of 40 nm across the complete telecom C-band (1525-1565 nm). Calculations predict net gain in a combined amplifier and 1 × 4 power splitter device over the same wavelength range for a total injected pump power as low as 30 mW.
conference on lasers and electro optics | 2012
L. Agazzi; Kerstin Worhoff; Markus Pollnau
The influence of migration-accelerated energy-transfer upconversion and fast luminescence quenching on the performance of Al<sub>2</sub>O<sub>3</sub>:Er<sup>3+</sup> waveguide amplifiers is investigated. Results indicate that the latter has the stronger impact on the amplifier small-signal gain.
Proceedings of SPIE, the International Society for Optical Engineering | 2010
Kerstin Worhoff; J. Bradley; L. Agazzi; Markus Pollnau
Erbium-doped aluminum oxide channel waveguides were fabricated on silicon substrates and their characteristics were investigated for Er concentrations ranging from 0.27 to 4.2 × 1020 cm-3. Background losses below 0.3 dB/cm at 1320 nm were measured. For optimum Er concentrations in the range of 1 to 2 × 1020 cm-3, internal net gain was obtained over a wavelength range of 80 nm (1500-1580 nm) and a peak gain of 2.0 dB/cm was measured at 1533 nm. 170 Gbit/s high-speed data amplification was demonstrated in an Al2O3:Er3+ channel waveguide with open eye diagrams and without penalty. A lossless 1×2 power splitter has been realized in Al2O3:Er3+ with net gain over a wavelength range of 40 nm (1525-1565 nm) across the complete telecom C-band.
european quantum electronics conference | 2009
Markus Pollnau; Kerstin Worhoff; Feridun Ay; Dimitri Geskus; L. Agazzi; J. Bradley
In this paper we experimentally compare pumping at 977 nm and 1480 nm and the influence on gain in an Al2O3:Er3+ amplifier. We show that significantly higher gain can be achieved when pumping at 977 nm, and a record-high peak gain and gain bandwidth obtains compared to previous results in this material. Al2O3:Er3+ straight channel waveguide amplifiers were fabricated on thermally-oxidized silicon substrates by reactive co-sputtering, standard lithography and reactive ion etching [4]. The amplifiers were ~6-cm-long with a waveguide cross section of 1 Icircfrac14m x 4 Icircfrac14m and an etch depth of ~70 nm. The waveguide dimensions were selected for single-mode propagation at wavelengths of 977 nm and above, good overlap of pump and signal mode profiles (for both 977-nm and 1480-nm pumping) and strong confinement of the propagating pump and signal within the active region.
conference on lasers and electro optics | 2008
J. Bradley; L. Agazzi; Dimitri Geskus; Tom Blauwendraat; Feridun Ay; Kerstin Worhoff; Markus Pollnau
Reactively co-sputtered aluminum oxide layers with low background loss and varying Er concentrations have been deposited. Net optical gain of 0.76 dB/cm was obtained for an Er concentration of 0.9times1020 cm-3 in a channel waveguide.
Lasers, Sources, and Related Photonic Devices (2012), paper AT4A.18 | 2012
L. Agazzi; E. H. Bernhardi; Kerstin Worhoff; Markus Pollnau
The impact of luminescence quenching on rare-earth-ion doped lasers is investigated, and we show that the expression for the relaxation oscillation frequency needs to be modified to take the quenching properly into account.
conference on lasers and electro optics | 2010
L. Agazzi; J. Bradley; Günther Roelkens; Roel Baets; Feridun Ay; Kerstin Worhoff; Markus Pollnau
Co-sputtering and structuring active erbium-doped aluminum oxide waveguides directly on top of processed SOI passive waveguides provides coupling losses of 2.5 dB between active and passive waveguides and a signal enhancement of 7.2 dB.
Journal of Physical Chemistry C | 2013
L. Agazzi; Kerstin Worhoff; Markus Pollnau
lasers and electro optics society meeting | 2008
Stéphane Clemmen; Kien Phan Huy; Wim Bogaerts; Roel Baets; Philippe Emplit; Serge Massar; Kerstin Worhoff; L. Agazzi; N Ismail; Xjm Xaveer Leijtens
Systems & Control Letters | 2009
J. Bradley; Remco Stoffer; L. Agazzi; F. Ay; Kerstin Worhoff; Markus Pollnau