Artículos

Four-channel WDM transmitter with heterogeneously integrated III-V/Si photonics and low power 32 nm CMOS drivers

Fri, 01 Jan 2016 00:00:00 GMT

Four-channel WDM transmitter with heterogeneously integrated III-V/Si photonics and low power 32 nm CMOS drivers Huynh, Tam; Ramaswamy, Anand; Rimolo-Donadio, Renato; Schow, Clint; Roth, Jonathan; Norberg, Erik; Proesel, Jonathan; Guzzon, Robert; Shin, Jaehyuk; Rylyakov, Alexander; Baks, Christian; Koch, Brian; Sparacin, Daniel; Fish, Greg; Lee, Benjamin We experimentally demonstrate a novel four-channel wavelength division multiplexing transmitter operating at 1.3 μm wavelength employing heterogeneously integrated III-V/Si photonic circuit copackaged with low-power 32-nm SOI CMOS driver integrated circuits (ICs). Error-free operation (BER < 10−12 ) has been achieved across all four channels for back-to-back, 2 and 10 km single-mode fiber transmission at 25 Gb/s per each channel, targeting intra- and inter-datacenter interconnect applications. Power consumption as low as 19.2 mW for four CMOS driver ICs has been recorded, which yields 0.19 pJ/bit energy efficiency. Artículo científico

Flexible transmitter employing Silicon-segmented Mach–zehnder modulator with 32-nm CMOS distributed driver

Fri, 01 Jan 2016 00:00:00 GMT

Flexible transmitter employing Silicon-segmented Mach–zehnder modulator with 32-nm CMOS distributed driver Huynh, Tam; Rimolo-Donadio, Renato; Gill, D. M.; Rylyakov, Alexander; Green, William; Dupuis, Nicolas; Proesel, Jonathan; Baks, Christian; Schow, Clint L.; Lee, Benjamin We propose a flexible optical transmitter for shortreach optical interconnects that includes a silicon photonic segmented Mach-Zehnder modulator (MZM) driven by a distributed six-channel 32nm SOI CMOS driver integrated circuit. Optical equalization is demonstrated to extend the bandwidth limitation of the transmitter with NRZ signaling at 25Gb/s. We also generate four-level pulse amplitude modulation (PAM-4) signaling using the same transmitter architecture. Transmission of 46Gb/s PAM-4 signal with bit error rate (BER) well below hard-decision forward error correction limit (BER=3.8×10-3) is experimentally demonstrated. Low driver power consumption of 130 mW at 46Gb/s PAM-4, corresponding to 2.8 pJ/bit power efficiency, is also achieved. Artículo científico

PEDOT:PSS: A conductive and flexible polymer for sensor integration in Organ-on-Chip platforms

Fri, 01 Jan 2016 00:00:00 GMT

PEDOT:PSS: A conductive and flexible polymer for sensor integration in Organ-on-Chip platforms Quiros-Solano, William; Gaio, Nikolas; Silvestri, Cinzia Sensing and stimulating microstructures are necessary to develop more specialized and highly accurate Organ-on-Chip (OOC) platforms. In this paper, we present the integration of a conductive polymer, poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), on a stretchable membrane, core element of an Heart-on-Chip. The electrical conductivity along with its biocompatibility, high transparency (��88 %) and mechanical elasticity (��1.2 GPa) make this material a candidate to develop novel microstructures for electrical monitoring and stimulation of cells in flexible-substrate based OOCs. Microstructures with different shapes and geometries of PEDOT:PSS embedded in a 9 μm-thick Polydimethylsiloxane (PDMS) membrane are developed following a wafer-level fabrication approach. PEDOT:PSS layers between 120 nm and 300 nm are obtained by varying the deposition conditions. The layers are successfully patterned and microstructures with lateral dimensions down to 2 μm. The obtained results indicate that this polymer is a suitable material for microfabrication of sensing and stimulating elements in OOC platforms. Conferencia

Model reduction of a flexible-joint robot: a port-Hamiltonian approach

Fri, 01 Jan 2016 00:00:00 GMT

Model reduction of a flexible-joint robot: a port-Hamiltonian approach Jardón-Kojakhmetov, Hildeberto; Muñoz-Arias, Mauricio; Scherpen, Jacquelien In this paper we explore the methodology of model order reduction based on singular perturbations for a flexible-joint robot within the port-Hamiltonian framework. We show that a flexible-joint robot has a port-Hamiltonian representation which is also a singularly perturbed ordinary differential equation. Moreover, the associated reduced slow subsystem corresponds to a port-Hamiltonian model of a rigid-joint robot. To exploit the usefulness of the reduced models, we provide a numerical example where an existing controller for a rigid robot is implemented. Artículo científico