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This work reviews a high-speed, direct modulation underwater optical communication link enabled by a combination of polarization and Orbital Angular Momentum (OAM) multiplexing techniques that results in a data rate of 12 Gbit/s. An efficient technique for combining and sorting multiple OAM modes is presented based on log-polar coordinate transformation diffractive phase only optics.
This work presents the generation, dynamic phase modulation and phase detection of interfering composite optical vortices. This technique demonstrates a new method for encoding information onto an optical beam for potential use in underwater communication as well as sensing applications including object detection and channel characterization.
Pronounced plasmonic absorption features at terahertz frequencies are measured in large-area graphene sheets coupled to periodic arrays of metallic nanoparticles, and limitations on their tunability caused by carrier density inhomogeneities are investigated.
InGaP alloy nanowires with In-composition continuously varying from 12% to 73% are demonstrated using chemical vapor deposition on a single silicon substrate, corresponding peak of photoluminescence changing from 580 nm to 780 nm.
We design a three mode elliptical-core mode-selective photonic lantern (EC-MSPL) which can match well with the elliptical core few mode fiber in MIMO-free MDM systems. The mode crosstalk of the EC-MSPL are below −20dB for all three modes.
The precise characterisation of boiling in microchannels is essential for the optimisation of applications requiring two phase cooling. In this paper polydimethylsiloxane (PDMS) is employed to make microchannels for characterising microboiling. In particular the material properties of PDMS facilitate rapid prototyping and its optical transparency provides the capability to directly view any fluid...
A novel optical method for enhancing nanopore-based single molecule detection is demonstrated. Microbeads containing DNA targets are optically trapped under a nanopore to locally increase the concentration. Thermally released DNAs are then detected electrically when moving through the pore at up to 91x higher rates.
Near-zero index metamaterials play an important role in wave-matter interactions, exhibiting several promising techniques to control and manipulate fields and waves. In this paper, we study the scattering properties of the epsilon-and-mu-near-zero metamaterials. By immersing a non-magnetic dielectric rod within the epsilon-near-zero host, we can imitate the far-field scattering pattern of epsilon-and-mu-near-zero...
Thermal plastic material polypropylene (PP) has been considered as a promising candidate for recyclable insulation of power cable. However, the stiffness of PP is higher than that of XLPE which makes it difficult to be used directly as cable insulation. In this work, two kinds of elastomers, i.e. polyolefin elastomer (POE) and propylene-based elastomer (PBE), have been added into isotactic polypropylene...
The analysis of trabecular bone micro structure from in-vivo CT images is still limited due to limited spatial resolution even with the new High Resolution peripheral Quantitative CT (HR-pQCT) scanners. In previous works, it has been proposed to exploit super resolution techniques to improve spatial resolution. However, the application of such methods requires to know the blurring kernel, which is...
We demonstrated experimentally a stable 1μm multi-wavelength YDF based random fiber laser by using a polarization independent Sagnac-loop mirror with output power of 1.6W and high OSNR of 30dB.
Structural and functional neuroimaging studies have indicated that the cortico-striato -thalamo-cortical (CSTC) circuit contributes to the pathophysiology of obsessive compulsive disorder (OCD). As an essential component of CSTC circuit, the dorsal anterior cingulate cortex (dACC) plays an important role for its advanced function in cognition and emotion control. A comprehensive understanding of the...
In a Cloud Radio Access Network (C-RAN) architecture, different baseband processing functions (BPFs) splits options are available on the interface between the central unit (CU) and the radio units (RUs) [1]. A lower layer split, e.g., low-physical (PHY), can support advanced radio coordination techniques, for example Joint Reception (JR) Coordinated MultiPoint (JR-CoMP) [2]. However, the interface...
A bidirectional fiber-IVLLC and fiber-wireless convergence system based on two orthogonally polarized optical sidebands for hybrid CATV/MMW/BB signal transmission is proposed and demonstrated. Two orthogonally polarized optical sidebands are transmitted over a 40-km SMF transport to effectively reduce the fiber dispersion and the distortion. The approach presented in this work signifies the advancements...
Decomposition is performed for the 4×4 SMAP radar channel covariance matrix and the correlation between resulting components, surface soil moisture and vegetation is examined. Globally, the first principal component is the most dominant and the correlation coefficients with respect to soil mortise is highest (R2 ≥ 0.8) in regions with fractional ground cover and sufficient temporal dynamics of soil...
A novel phase-shifted optical analog-to-digital converter using cascaded step-size MMI as quantization module is demonstrated. The cascaded MMI on SOI has a compact footprint of 7.5×100 μm2 and ultra-low insertion loss of 0.2dB.
The coupling between neuronal activity and cerebral blood flow(CBF), known as neurovascular coupling, serves as the basis of functional brain imaging. Optogenetics provides a precise and selective approach to manipulate the activity in cell-specific neurons. It has been used in neuroscience research for comprehensive understanding about the light-evoked neurovascular coupling in rodent neuronal circuits...
A novel suspended GeSn microstructure is demonstrated by selective etching of GeSn thin film on Ge. XRD and μ-Raman measurements show that the compressive strain in the GeSn thin film is effectively relaxed, and furthermore, unexpected tensile strain was introduced in the suspended GeSn.
We present our recent researches on novel group IV nano- and micro-structures for potential light sources on Si, including the tensile strained Ge quantum dots (QDs), GeSn thin films and microstructures, and Ge(Sn) nanowires. Tensile-strained Ge QDs were grown by SS-MBE, and photoluminescence was achieved. The GeSn thin films were demonstrated with Sn concentration above the bandgap transition critical...
In CPU, SOC, GPU, and PC-on-chip, I/O power consumption can be significant. To improve power efficiency, I/O bundles in group of 4, 8, or 16b, should scale their data rate according to the application requirements. However, clocking architecture imposes significant challenges to support different data rate simultaneously. In high bandwidth I/O, LC oscillators are preferred for low jitter, but the...
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