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We demonstrate all-optical operation of nonvolatile memory cells made from phase-change materials. The cells are embedded in nanophotonic circuits and can be used at writing speeds approaching the GHz-regime.
Power and spectral characteristics of lasers with asymmetric barrier layers (ABLs) and a wide waveguide are studied. The use of ABLs reduces the saturation of light-current characteristic, associated with the parasitic recombination in the waveguide.
We will review recent record transoceanic length transmission demonstrations and discuss techniques that facilitated capacity improvements in laboratory experiments. In particular, transmission using coded modulation and broad-bandwidth amplification will be discussed.
The gain-current relationships for quantum-dot and quantum-well lasers are compared experimentally and theoretically. Rigorous treatment of collision effects using quantum-kinetic equations improves precision in determination of extrinsic parameters and prediction of performance.
Optical characterisation of a Nephila edulis spider dragline silk is performed. The silk fiber transmits light up to 1400 nm with a propagation loss of ∼9 dB/cm and birefringence of 8×10−3 measured at 1302 nm.
We demonstrate a replica molded photonic crystal structure with embedded quantum dots in which electrohydrodynamic jet printing is used to control the position of the quantum dots within the device structure. This results in significantly less waste of the quantum dot material and the targeted placement of the quantum dots minimizes any emission outside of the resonant enhancement field, enabling...
We demonstrate a mode division multiplexing (MDM) system over an 8 km conventional graded index multimode fiber (GI-MMF). Spatial light modulators (SLMs) are used to multiplex and demultiplex three linearly polarized (LP) modes (LP01, LP11a and LP11b) in two polarizations. A 6×6 sparse frequency domain equalizer (FDE) is used as the channel impulse response of the SLM-based MDM system is found to...
Grating-coupled, surface-emitting (GCSE) quantum-cascade lasers (QCLs) have been studied since 2000 [1] and generally operate in a two-lobe beam pattern [1,2]. Recently, single-lobe surface emission has been reported either from asymmetrically-coated devices [3] or from chirped-grating, ring-cavity devices [4], but at powers ≤ 0.1 W. Here we present the implementation of a novel concept for high-power,...
The phase change dispersion during the surface plasmon wave coupling process was extracted experimentally using a slit-groove interferometer and validated through numerical simulation, enriching the fundamental understanding of plasmonic subwavelength optics on a chip.
The existence and stability of moving gap solitons in coupled Bragg gratings with cubic-quintic nonlinearity are investigated. The effect of quintic nonlinearity and velocity of soliton on the stability of gap solitons are analyzed.
This talk describes how high-performance ultra-wideband Phased Array Systems can be enabled through silicon photonics based photonic integrated circuits. Component technologies including heterogeneous integration of III–V materials and ultra-low-loss silicon nitride waveguides, plus laser, modulator, filter and true-time-delay devices and sub-systems will be described.
This talk describes the theory and implementation of dynamically biased APDs for nulling the avalanche buildup time in direct-detection optical communications. The technique is applicable to any APD and can enable operation at data rates that exceed the traditional limits dictated by the gain-bandwidth product associated with statically biased APDs.
We present an experimental characterization of longitudinal zero-dispersion wavelength variations in a novel, strained, highly nonlinear fiber, by simple four-wave mixing spectrum analysis, and provide new insights to the analysis supported by detailed numerical simulations.
Au nanoparticles were anchored on top of monolayer MoS2. Direct reflection spectra were studied, which indicates significant improvement (∼ 3.5%) of total average absorption in vis-NIR range by the plasmonic absorption of Au nanoparticles.
A CdSxSe1−x/ZnS colloidal quantum dot distributed-feedback laser operating in the nanosecond-regime with a threshold below 3 kW/cm2 is reported. The laser emits vertically up to 40 nJ at 600 nm with an efficiency of 1.2%.
A self-delayed heterodyne measurement of a short cavity swept source is presented, enabling the real-time reconstruction of the entire complex electric field over multiple sweep periods. The instantaneous wavelength is measured over the ∼100 nm sweep range. Knowledge of the full electric field furthermore allows numerical calculation of various laser properties, including for example the instantaneous...
We present the first real-time transmission experiment over a 60-km-long fiber supporting six coupled spatial and polarization modes, enabled by a custom receiver board and an FPGA-implementation of an unconstrained adaptive frequency-domain MIMO equalizer.
We discuss the dispersion properties of silicon nitride waveguides by taking into account the effect of bending, as relevant to microring resonators. Material dispersion characterized by near-infrared spectroscopic ellipsometry is also presented.
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