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Heavily sediment-laden flows have been described and classified as hyperconcentrated sediment flows, including mud floods, mudflows, and debris flows. The authors prescribe definitions based on governing physical processes and limited concentrations of cohesive material. Viscous mudflows contain large concentrations of fine cohesive material. Rocky debris flows contain large concentrations of clastic...
Photovoltaic backsheets are an essential part of photovoltaic modules. It is imperative that the backsheet perform and be shown to be weatherable over the 25 year expected module lifetime. This paper reports on findings from a study focused on understanding the durability of the outer weatherable layers of commercial backsheets exposed in south Florida. Within one year of exposure, Non-Fluoropolymer...
Bursting is a striking feature found in a wide range of physical and biological systems. It is characterized by periods of quiescence that are interspersed with periods of activity. We present an experimental and theoretical study of an interesting bursting mechanism in a two-mode semiconductor laser with single-mode optical injection. By tuning the strength and frequency of the injected light we...
We consider the application of cloud computing to the process of algorithm development. We introduce a case study focusing on the development of a novel algorithm in computational electromagnetics, illustrating several challenging areas for algorithm developers where cloud-based architectures can deliver enhanced productivity and potentially save costs. The development, verification and tuning of...
We demonstrate low timing jitter 100 GHz passive mode-locking of a discrete mode (DM) laser. This Fabry-Perot device incorporates a spatially varying effective index selecting modes. Near Fourier limited 2.5 ps pulses were obtained.
Mode-locking at 100 GHz with 2 ps pulse duration is demonstrated in a quantum-well diode laser designed to support a discrete comb of modes. Spectral filtering was achieved using a non-periodic patterning of the cavity effective index.
Modifications to a standard capacitive MEMS switch process have been made to allow the incorporation of ultra-nano-crystalline diamond as the switch dielectric. The impact on electromechanical performance is minimal. However, these devices exhibit uniquely different charging characteristics, with charging and discharging time constants 5-6 orders of magnitude quicker than conventional materials. This...
Modifications to a standard capacitive MEMS switch process have been made to allow the incorporation of ultra-nano-crystalline diamond as the switch dielectric. The impact on electromechanical performance is minimal. However, these devices exhibit uniquely different charging characteristics, with charging and discharging time constants 5–6 orders of magnitude quicker than conventional materials. This...
This paper presents a multi-quantum well InP/InGaAlAs two-colour Fabry-Perot laser that incorporates slotted regions in the laser ridge waveguide. A hysteresis loop of the output power in the uninjected mode as a function of the power injected in the long-wavelength primary mode . Pulse modulation of the injected power leads to switching between these states. To understand the structure of the bifurcations...
An experimental study of multimode dynamics in a two-mode semiconductor laser with optical injection is presented. The device we consider is a specially engineered two-colour Fabry-Perot laser diode [Eblana Photonics] with a large (THz) primary mode spacing. At a fixed injected power level, we vary the detuning of the injected field from the long wavelength mode of the device. The optical spectra...
We have fabricated and assessed 1550 nm SIBH FP lasers using a novel Ruthenium precursor for MOVPE. Low temperature analysis revealed no unexpected defects and performance is similar to standard p-n-p-n current blocking devices. Accelerated aging at 85degC indicates no significant degradation after 5,700 hours on test.
The semiconductor laser with an injected signal is a conceptually simple system which nevertheless displays complex dynamics including chaos. Experimental and theoretical studies of this system have tended to focus on single mode lasers. Using an inverse problem solution, which relates the threshold gain modulation in wavenumber space to the spatially varying refractive index in a Fabry-Perot (FP)...
A two-color Fabry-Perot laser is designed with a distribution of slots in the ridge waveguide, fabricated and characterised. The two-color lasing produces a strong four wave mixing signal, and is promising for direct THz emission.
A discrete mode Fabry-Perot laser is designed and fabricated to achieve two-color lasing. We demonstrate beating between the two laser modes and self-pulsation at 480 GHz.
We present two-colour Fabry-Perot lasers obtained using non-periodic effective index patterns. The devices oscillate simultaneously on two Fabry-Perot modes and are attractive for THz generation
Compact, low dispersion penalty modulators are described with time averaged optical output powers of up to 6 dBm in long reach 10 Gbit/s systems and up to 3.6 dBm in short reach 40 Gbit/s systems
The dielectric material used to fill trenches in Shallow Trench Isolation (STI) of transistors, is key to device performance. This paper (a) evaluates the integration of currently available dielectric technologies and (b) designs an optimized process scheme for 0.25 /spl mu/m node and beyond. A detailed study of LPCVD TEOS, SACVD oxide, Hydrogen-Silsesquioxane SOG (HSQ) and ICP (Inductively Coupled)...
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