Bert J. Offrein

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SiON high-refractive-index waveguide and planar lightwave circuits The rapidly growing optical communication market requires photonic components with ever-increasing functionality and complexity that can be fabricated reliably at low cost. Of the various approaches used to fabricate photonic components, those based on planar waveguides have achieved high(More)
—To reduce the coupling loss of a fiber-to-ridge wave-guide connection, a planar silica spot-size converter for a wavelength of 1.55 m is implemented in the form of a nonpe-riodic segmented waveguide structure with irregular tapering. A simple single-step lithography process is sufficient for the fabrication of the planar structures. An evolutionary(More)
The computational and storage demands for the future Square Kilometer Array (SKA) radio telescope are significant. Building on the experience gained with the collaboration between ASTRON and IBM with the Blue Gene based LOFAR correlator, ASTRON and IBM have now embarked on a public-private exascale computing research project aimed at solving the SKA(More)
—The protocol data rate governing data storage devices will increase to over 12 Gb/s by 2013 thereby imposing unmanageable cost and performance burdens on future digital data storage systems. The resulting performance bottleneck can be substantially reduced by conveying high-speed data optically instead of electronically. A novel active pluggable 82.5 Gb/s(More)
The computational and storage demands for the future Square Kilometer Array (SKA) radio telescope are significant. Building on the experience gained with the collaboration between ASTRON and IBM with the Blue Gene based LOFAR correlator, ASTRON and IBM have now embarked on a public-private exascale computing research project aimed at solving the SKA(More)
Apodised Bragg gratings in planar waveguides for add-drop filters a , b b b b b Abstract We report on the fabrication by electron-beam lithography of Bragg gratings, which serve as wavelength-selective elements of a Mach–Zehnder-type add-drop filter. To meet telecommunication network requirements, the gratings must have about 20 000 lines, corresponding to(More)
The ROAM (Revolutionizing optical fiber transmission and networking using the Orbital Angular Momentum of light) project investigates the orbital angular momentum (OAM) modes of light for communications and networking applications. OAM modes are exploited as a disruptive means of increasing fibre transmission capacity and as switching resource to improve(More)
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