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We review the state of the art of silicon photonic switches, with an emphasis on their scalabilities. We also describe a high-radix MEMS-actuated silicon photonic switch that is scalable to hundreds of ports.
Using the Vernier effect and the interference between its three branches, the proposed self-imaging multi-mode-interferometer (MMI)-based tunable laser can access all ITU channels across C-band with high side-mode suppression ratios (SMSR).
Silicon nitride spot-size converters were fabricated in a damascene process to improve the performance of supercontinuum generation in arsenic-free chalcogenide waveguides. Supercontinuum generation covering 950–1750 nm with 200 pJ pulses is demonstrated.
We show that using nanoparticles made of low-loss doped semiconductors in place of noble metals with higher losses does not lead to the anticipated superior enhancement of the electric field.
Octave-spanning supercontinuum is generated in chalcogenide, Ge23Sb7S70, waveguides pumped at 1550 nm. The 2μm side is subsequently amplified in a Thulium-doped fiber amplifier and utilized for second-harmonic generation (SHG). The generated signal has 55 dB of signal-to-noise ratio.
We demonstrate low surface recombination velocity (∼8700 cm/s) and reduction of non-radiative lifetime in an InP/InGaAs nanoscale light emitting diode using a sacrificial Al2O3 layer. We predict high efficiency operation after modest enhancement of spontaneous emission rate with an optical antenna.
A heterogeneous platform i s demonstrated by integrating lithiumniobate and chalcogenide glass waveguides on silicon with optical transition through low-loss mode-converting tapers. The method provides an efficient utilization of second- and third-order nonlinearities on t he same chip for applications like stabilized octave-spanning optical combs.
We propose a novel structure to efficiently couple the output of electrically injected slot antenna based nanoLEDs into a single mode waveguide. 3D FDTD simulations show it is possible to achieve 85% waveguide-coupling efficiency with a 250nm 3dB bandwidth.
We report the stabilization of a 10 GHz monolithic passively mode-locked laser using a novel combination of multitone injection locking and regenerative mode-locking via optoelectronic loop. Comb-teeth linewidths are narrowed by 4000x and repetition rate is stabilized to better than 10−10/τ at 1 second.
The use of batteries and other electrochemical devices in modern power systems is rapidly increasing, with stricter requirements in terms of cost, efficiency and reliability. Innovative monitoring solutions are therefore urged to allow a successful development of a wide range of emerging applications, including electric vehicles and large-scale energy storage to support renewable energy generation...
Karlsruhe Institute of Technology (KIT) is doing research and development in the field of high power gyrotrons for W7-X, ITER, and, towards a future DEMOnstration fusion power plant. While the initial installation of the ECRH system at W7-X is finished and operating very successfully, KIT is still involved in the development of gyrotrons for ITER. This work is coordinated by F4E and ongoing in frame...
We present the design of an analog Silicon Photonic MEMS phase shifter based on vertically moving adiabatic couplers. Using a two-step electrostatic actuation method, the phase shifter can be turned on selectively by applying an actuation voltage on a first pair of electrodes, and the phase of the optical signal can be tuned continuously by applying an actuation voltage at a second electrode pair...
This paper presents a dynamic gene and transcriptional regulatory network inferring method by using the time-varying autoregressive (TVAR) model. It employs the Li-based regularization terms with spatial sparsity, temporal continuity and proposed multi-Laplacian prior (MLP) for key transcriptional factors (TFs) and their interactions identification. The MLP regularization allows the connections of...
This paper introduces the realization and calibration of complex impedance standard which is a kind of active simulation impedance. As a new calibration equipment for digital bridge, complex impedance standard can simulate any amplitude or angle of complex impedance by generating voltage and current to calibrate digital bridge in the whole complex plane, which can make up for deficiency in the calibration...
With optical antennas, spontaneous light emission becomes faster than stimulated emission, but the enhancement is limited by optical losses through the “anomalous skin effect”. Maintaining 50% efficiency, a 10x speedup beyond stimulated emission should be possible. The antenna-LED will replace the laser for on-chip optical communication.
We demonstrate the first silicon photonics enabled hyper-wideband wireless link with an instantaneous bandwidth of 12 GHz, which is 85% of the center frequency of 14 GHz. The silicon photonics based RF receiver consists of a four-channel optical phase encoder, an integrated hybrid-silicon mode-locked laser, and two silicon ring notch filters. The received CDMA RF wireless signal is correlated to baseband...
We present two key results in this work related to magnetic shielding. First, milliscale single layer magnetic shields were fabricated on 3D printed polymer molds and achieved shielding factors in excess of 4500. Second, microscale multilayer shields of alternating 10 μm layers of Permalloy and copper were microfabricated onto silicon using batch fabrication processes and characterized. While conventional...
We report on high density optical packaging of high radix (64×64) silicon photonic MEMS switches using pitch-reducing optical fiber array. The footprint of 61-channel optical I/O is as small as 330μm × 280μm.
Missing data imputation is often required in wireless sensor networks (WSNs) to fill up missing measurements due to transmission loss, hardware failure and other factors. In this paper, we propose new variable forgetting factor (VFF) and regularization extensions to the recursive dynamic factor analysis (RDFA) algorithm for imputation of missing data in WSN data. It takes advantage of the correlated...
This paper presents preliminary results and findings of a dynamic gene regulatory network analysis obtained from Saccharomyces cerevisiae (budding yeast) time-course DNA microarray data using a new Alternative Direction Methods of Multipliers (ADMM) based maximum a posteriori probability and time-varying autoregression model (MAP-TVAR) approach. It employs the Li-regularization based sparsity and...
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