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Berglind E.,KTH Royal Institute of Technology | Berglind E.,Kista Photonics Research Center | Berglind E.,Zhejiang University | Thylen L.,KTH Royal Institute of Technology | And 6 more authors.
IET Optoelectronics | Year: 2010

To investigate the potential for dense integration of photonic components, we analyse passive plasmonic/metallic waveguides and waveguide components at optical frequencies by using mostly microwave engineering approaches. Four figures of performance are formulated that are utilised to compare the characteristics of four different slab waveguides with zero frequency cut-off modes. Three of these are metallic based whereas the fourth one, which also serves as a reference, is dielectric based with high index-contrast. It is found that all figures of performance cannot be optimised independently; in particular there is a trade-off between the waveguide Q-value and the transversal field confinement. Microwave methods are used to design several photonic transmission line components. The small Q-value of the metallic waveguides is the main disadvantage when using materials and telecom frequencies of today. Hence plasmonic waveguides do not offer full functionality for some important integrated components, being severe for frequency-selective applications. To achieve a dense integration, it is concluded that new materials are needed that offer Q-values several orders of magnitude higher than metals. © 2010 © The Institution of Engineering and Technology.

Wosinski L.,KTH Royal Institute of Technology | Wosinski L.,Zhejiang University | Wosinski L.,Kista Photonics Research Center | Wang Z.,KTH Royal Institute of Technology | And 2 more authors.
International Conference on Transparent Optical Networks | Year: 2011

To solve the processors performance limitations, new chip-to-chip and on-chip communication needs to be introduced. Optical technology will play here a crucial role. Optical links will move into the chip multiprocessors connecting tens or even hundreds of processing elements and forming a photonic network for communication between them. In this talk we will present our solutions of silicon-based CMOS-compatible optical components for the main building blocks in application to computer interconnects. © 2011 IEEE.

Zhang A.Z.,Acreo Ab | Zhang A.Z.,Kista Photonics Research Center | Wang Q.,Acreo Ab | Wang Q.,Kista Photonics Research Center | And 20 more authors.
Semiconductor Science and Technology | Year: 2011

We report on the fabrication of a monolithically integrated semiconductor optical amplifier (SOA) and a reflective electro-absorption transceiver (EAT) for 40-60 GHz radio-over-fiber applications. The EAT can either function as a transmitter (reflective modulator) or as a receiver (photodetector) depending on operation mode. The SOA and the EAT sections are based on different InGaAsP multiple quantum-well active layers connected by a butt joint. Benzocyclobutene is used to reduce the capacitance beside the ridge mesa. Devices are designed to have a peaked response at the operating frequency through the design of microwave waveguides on top of the devices. The packaged device exhibits at 0.1 mW optical input power an amplified DC responsivity of 18.5 mA mW-1 and a modulation efficiency of 0.67 mW V-1. The estimated radio frequency loss at 40 GHz of an optical link consisting of two SOA-EAT devices was 23 dB using an unmodulated optical input carrier to the transmitter of 0.94 mW. © 2011 IOP Publishing Ltd.

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