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A microresonator having Q factors greater than 200 million and featuring a silicon-nitride integrated coupling waveguide is described. The device is a critical advance for new microcavity applications requiring integrated, ultra-high-Q and millimeter-scale cavities.
We demonstrate an optical clock based on stabilization of a microcomb to rubidium optical transitions. The clock's output is the 33 GHz microcomb line spacing, which is a coherent, integer sub-division of the rubidium reference.
In my presentation I will review our recent results related to nanophotonic hybrid waveguides in fiber form. I will discuss plasmonic hybridization of spiralling plasmons excited on metallic nanowires in photonic crystal fibers. I will also discuss the optical properties and fabrication of highly nonlinear chalcogenide-silica waveguides and their application in infrared supercontinuum generation.
A multicasting fiber optic switch employing a liquid crystal on silicon spatial light modulator is used to demonstrate wavefront encoding, a novel technique for crosstalk mitigation. Experimentally we reduce worst case crosstalk by 7.5dB.
We propose a new low-cost solution using orthogonal transmission of non-return-to-zero and carrierless-amplitude-and-phase format data to realize a coarse OFDM transmission system. Using low bandwidth electronics and optoelectronic components, the system is demonstrated at 37.5Gb/s.
A 2-D Hermite-Gaussian square launch is demonstrated to show improved systems capacity over multimode fiber links. It shows a bandwidth improvement over both center and offset launches and exhibits ±5 μm misalignment tolerance.
A novel elliptical Gaussian beam line launch is shown to allow improved system capacity for high speed multimode fibre links. This launch maintains higher bandwidth than dual launch even with misalignment of ±6 μm despite not requiring testing at installation.
We demonstrate novel detuned dual-mode laser for tunable continuous-wave terahertz generation with InGaAs-based photomixers. The beat frequency from this dual-mode multisection laser is continuously tuned from 0.30 to over 1.15 THz.
Photonic crystal fibers (PCFs) consist of arrays of micrometer-size hollow channels extending along the entire fiber length. A new approach to modify the optical properties and to improve the design flexibility of such fibers is to fill the air holes of the array by with different materials, realizing all-solid hybrid fiber structures. In this talk, recent results on silica PCF filled with noble metals,...
The optic disc is an important feature in the retina. We propose a method for the detection of the optic disc based on a supervised learning scheme. The method employs pixel and local neighbourhood features extracted from the ROI of a digital retinal fundus photograph. A support vector machine based classification mechanism is used to classify each image point as belonging to the cup and retina. The...
We demonstrate Cerenkov radiation generation in a higher-order-mode fiber with anomalous dispersion from approximately 700 to 800 nm. Cerenkov radiation at 850 nm with 0.6 nJ pulse energy is generated with 60% power conversion efficiency.
This paper presents a novel hierarchical and grid based reconfigurable optical-wireless network (GROW-Net) architecture. GROW-Net supports scalable and flexible integration of a large scale wireless mesh network in a municipal environment. Under the GROW-Net architecture, a joint evolution strategy is proposed to allow graceful upgrades in both optical backbone and wireless mesh network. To alleviate...
We report a novel method for measuring wide-band dispersion characteristics of electro-optic (EO) and thermo-optic (TO) switches based on a white-light interferometry. The dispersion spectra of the EO and TO coefficients of the optical switch materials over a wide wavelength can be determined with this method for potential applications of the switches to wide-band wavelength-division-multiplexed (WDM)...
Here we review on our results of photonic crystal fibres (PCFs) which have been filled with solid materials such as metals, semiconductors and low-melting temperature compound glasses. As filling method we used the high-temperature pressure cell technique. Depending on the material in the air-holes, we observed the excitation of spiralling plasmonic modes, Mie-resonances and coupled waveguide modes...
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