Ultra fast optical amplifier: Silicon and erbium on one chip for the first time

Sep 21, 2012
Image of the chip including silicon optical waveguide (SOI: silicon on insulator) as well as erbium-doped aluminium oxyde

Within optical microchips, light finds its way through channels, waveguides, made of silicon. Light from a glass fiber, for example, is led through a structure of optical channels with splitters and couplers. Silicon is the workhorse for this, but it is still passive conduction of light, with some losses as well. To be able to amplify the signal, or even to include a light source on the chip, extra steps are necessary. Other types of semiconductors, like gallium arsenide, are an option. But materials doped with the rare earth material erbium have good amplification properties as well.

Until now, no chip existed, on which both silicon and erbium-doped material were integrated. In her thesis, PhD candidate Laura Agazzi of the University of Twente demonstrates a working chip for the first time. It will be able to amplify light at speeds up to 170 Gbit/sec. The prototype chip has a of 7.2 decibel at infrared light (1533 nanometer).

The prototype is a starting point, but the results are very promising. One of the possibilities is a laser with an extremely narrow linewidth of 1.7 kHz. "In any application that needs emission or amplification of light, this integration of both materials is useful. It is not limited to telecom. You could use these chips for sensor purposes, for tracing extremely small particles, for example," Agazzi adds.

Laura Agazzi has investigated the of aluminium oxide doped with erbium, to understand the mechanisms that influence the amplification properties in a negative way. One of these is called energy-transfer up conversion (ETU), which is detrimental for good functionality."If  you want a large amplification, you would like to put many erbium ions in the material, this in turn can cause a higher ETU. There are possibilities in adapting the , causing less interaction of the ions. With my models, I have gained better insight in these and other mechanisms that lower the amplification.

Explore further: 'Dressed' laser aimed at clouds may be key to inducing rain, lightning

More information: Laura Agazzi conducted her research within the Integrated Optical Microsystems (IOMS) of prof Markus Pollnau, which is part of the MESA+ Institute for Nanotechnology of the University of Twente. On September 20 she successfully defended her thesis Spectroscopic Excitation and Quenching Processes in Rare-Earth-Ion-Doped Al2O3 and their Impact on Amplifier and Laser Performance. Her thesis, or a summary, are available digitally.

add to favorites email to friend print save as pdf

Related Stories

Scientists succeed in cooling solid material with laser

Jul 26, 2006

A team of researchers at the University of the Basque Country have experimentally demonstrated something that other scientists have been trying to achieve for decades: the cooling of erbium-doped materials with laser light.

Giant optical gain in a rare-earth-ion-doped microstructure

Jan 12, 2012

Prof. Markus Pollnau and co-workers at the MESA+ Institute for Nanotechnology at the University of Twente (The Netherlands) have developed a rare-earth-ion-doped optical amplifier with performance comparable to semiconductor ...

Recommended for you

Robotics goes micro-scale

Apr 17, 2014

(Phys.org) —The development of light-driven 'micro-robots' that can autonomously investigate and manipulate the nano-scale environment in a microscope comes a step closer, thanks to new research from the ...

High power laser sources at exotic wavelengths

Apr 14, 2014

High power laser sources at exotic wavelengths may be a step closer as researchers in China report a fibre optic parametric oscillator with record breaking efficiency. The research team believe this could ...

User comments : 0

More news stories

NASA's space station Robonaut finally getting legs

Robonaut, the first out-of-this-world humanoid, is finally getting its space legs. For three years, Robonaut has had to manage from the waist up. This new pair of legs means the experimental robot—now stuck ...