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The visible light communications properties of a microLED-pumped inorganic perovskite quantum dot color converter are reported. Free-space data communications at 364 Mb/s, using solely the color-converted light as the data signal optical carrier, is demonstrated.
Ultrafast laser inscription (ULI) allows the fabrication of compact, highly-efficient and robust laser sources over a broad range of crystalline, ceramic and glass gain media. For instance, subsurface waveguides can be formed by the stress induced refractive index modification effect which takes place between two parallel modified regions referred to as “Type II” guiding [1]. Previously, a family...
The properties and performance of CdSSe/ZnS colloidal quantum dot composite materials for use as InGaN LED color converters in visible light communications applications is reported. 500Mb/s optical wireless transmission is demonstrated.
Accurate positioning of semiconductor nanowires with lasing emission at room temperature at targeted locations, onto multiple substrates and forming complex spatial patterns is demonstrated using a novel nanoscale Transfer Printing technique.
Proof-of-principle coarse WDM transmission over SI-POF is demonstrated employing μLEDs, an APD receiver and PAM modulation. A record aggregate data rate of 11 Gb/s is achieved over 10 m of POF with a BER<10−3.
In this paper, feed-forward pre-equalization in conjunction with a PAM modulation scheme are proposed for use in wireless visible light communication (VLC) systems in order to enable the transmission of data rates >1 Gb/s. Simulation results demonstrate that simple few-tap feed-forward pre-equalization is able to remove the intersymbol interference caused by the limited link bandwidth of a line...
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%.
We report color-conversion of InGaN LEDs and lasers using an AlInGaP multi-quantum-well nanomembrane. In particular, we demonstrate free-space OOK data transmission at 180 Mb/s from a laser diode blue-to-red converted by a heterogeneous nanomembrane/sapphire lens assembly.
Feed-forward pre-equalization is investigated to extend the transmission capability of μLED-based links, providing better receiver sensitivities up to 5dB compared with post-equalization. Error-free 2Gb/s free-space VLC over 0.6m is demonstrated using a PAM-4 modulated blue μLED and an APD receiver.
Optically-generated PAM schemes using μLED arrays are implemented for high-speed POF links for the first time. 6.25Gb/s PAM-16 transmission is demonstrated using 4 μLEDs, exhibiting 3.8dB greater power-margin than a link with a single μLED.
Visible light communications (VLC) have attracted considerable research interest in recent years for use in both free-space and guided-wave optical links. In this paper, we review recent work on the development of guided-wave VLC links over plastic optical fibres (POF) and multimode polymer waveguides utilising micro-pixelated light-emitting diodes (μLEDs) and pulse amplitude modulation (PAM) schemes...
The integration of arrays of 486nm-emitting micron-size LEDs onto non-native substrates (including diamond, ultra-thin glass and MQW epitaxial structures) is demonstrated. The device bonding process relies solely on solvent-assisted capillary adhesion, and precision assembly through transfer printing.
Mechanically-flexible lasers made of thin-films of colloidal quantum dots on glass membranes are reported. These ns-pulsed lasers have 0.5mJ/cm2 (100 kW/cm2) thresholds and are wavelength-tunable across 18 nm. Improvements of CQD-laser materials are also studied.
Hybrid sources consisting of 450nm InGaN LEDs with capillary-bonded micron-thick multi-quantum-well color-converting membranes are reported. Such sources are attractive for visible light communications and a 540nm-emitting hybrid LED having a 57MHz modulation bandwidth is demonstrated.
We present an organic semiconductor distributed feedback laser biosensor and demonstrate its sensing capabilities. Optimization of the gain layer thickness to maximize the response to refractive index changes and bulk sensing results are shown. Desthiobiotin-avidin sensing assay results are also presented and the potential to perform multiple, repeated sensing measurements is demonstrated.
The nanosecond lasing performance of core-shell and alloyed CdSe/ZnS colloidal quantum dots is reported. Low amplified spontaneous emission and laser oscillation thresholds of 0.55mJ/cm2 and 0.9mJ/cm2 are demonstrated for, respectively, thin-films and distributed-feedback cavity structures.
We present a truxene-based distributed feedback laser sensor and demonstrate its sensing capabilities. Results for bulk refractive index sensing, detection of nano-layer adsorption at the laser surface and specific biomolecule sensing are shown.
We report on a new fabrication approach to create individually-addressable InGaN-based nanoscale-LEDs. It is based on the creation by LEEBI of a spatially confined sub-micron-size charge injection path within the p-GaN of an LED structure.
We report the modulation performance of micro-light-emitting diode arrays with peak emission ranging from 370 to 520 nm, and emitter diameters ranging from 14 to 84 μm. Bandwidths in excess of 400 MHz and error-free data transmission up to 1.1Gbit/s is shown. These devices are shown integrated with electronic drivers, allowing convenient control of individual array emitters. Transmission using such...
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