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This paper presents a novel time-interleaving digital-to-analogue converter architecture. Optical pulses sample the analog output of electrical converters and then combine them using an optical multiplexer. Since sampling and time alignment are superior in optical domain, doubling the current state-of-the-art performance is expected.
A circular-polarized orbital angular momentum (OAM) generator and multiplexer based on silicon on insulator is designed and simulated. This device can generate right hand and left hand circular polarized channels that can be coupled to OAM fiber without losses associated with filtering out unwanted polarization.
Phase Stretch Transform (PST), a physics-inspired computational approach for feature enhancement, is used to develop a diagnostic assistance tool for pneumothorax in X-ray images. The tool, which is first of its kind, helps in locating the boundary of collapsed lung, a life-critical clinical examination.
We discuss the possibility of multi Pb/s transmission using homogeneous, single-mode, multi-core fibers. We outline the key components of a recent demonstration, the consequences of fiber properties such as inter-core crosstalk and skew and potential for even greater efficiency from spatial-superchannel transmission.
MT type connector for 12 multicore fibers arranged in 2×6 array is developed. Rotational alignment precision within ± 0.9 degree is realized by employing alignment member with two fiber holes. Low connection loss less than 0.8 dB is also realized in all 84 cores.
A SiGe-on-SOI carrier-depletion Mach-Zehnder modulator is presented. Compared with Si modulators, it enables a dual-waveguide design using small SiGe waveguides for modulators and large Si waveguides for edge coupling thus eliminates advanced lithography for inverse tapers. DC and high speed test results are included.
This paper will outline proof-of-concept demonstrations of multi-Gigabit/s optical wireless transmission and will discuss challenges faced by the optical wireless in meeting Tutu re requirements such as supporting multiple users, low profile transceivers and resilience against noise and obstructions.
III-V nanostructures are promising building blocks for future optoelectronics applications. In order to exploit the unique properties of the III-V nanostructures such as high carrier mobility, high spin-orbit interaction and optimum band-gap for various applications one needs to be able to grow nanostructures with high crystallinity and desired dimensions and configurations.
High performance electro-optic (EO) polymers of side-chain polyurethane-imide were designed and synthesized to fabricated EO modulators. The polymers possess a high EO coefficient of larger than 55 pm/V and the fabricated modulator exhibits a low half-wave voltage of 1.875 V at 1550 nm.
It has been theoretically predicted that 1.9% biaxial tensile strain can convert Ge [1], which is compatible with Si CMOS technology, into a direct band-gap semiconductor, making it a candidate material for light sources on Si [2, 3]. Combining the advantage of tensile strain with quantum dot (QD), we proposed that tensile-strained QD is a new route toward light emission from Ge [4]. In this work,...
We present a transparent all-optical wireless architecture for full-duplex two-dimensional beam-steered communication system with wavelength reuse. We compare the performances of symmetric (down 10 Gbit/s / up 10 Gbit/s) and asymmetric (down 10 Gbit/s / up 2.5 Gbit/s) systems through experimental evaluation.
We propose a new approach to solve optimization problems using Generalized Lotka-Volterra with global inhibition. Stability criteria ensure the convergences of valid solutions are obtained and the solution is given by the switching time of the network elements. A network of coupled lasers is proposed.
Energy consumption and electrical bandwidth of reverse-biased optical modulators are studied numerically. Tradeoffs for bandwidth versus energy consumption as well as electrical versus optical and intrinsic versus extrinsic energy consumption are investigated. Enhancement of bandwidth-energy consumption tradeoff using a slow light structure is presented.
Germanium-tin is an emerging optoelectronic material, but its device properties are not yet well understood. To evaluate the feasibility of GeSn-based p-n junction diodes for device and circuit applications, layers of doped GeSn with Sn contents up to 10 % were grown by the method of solid source molecular beam epitaxy (MBE) at substrate temperatures near 150 °C, on Ge substrates as shown in Fig....
GeSn alloy has recently received significant attention due to the fact that their direct-bandgap behavior can be predicted when the Sn content is larger than about 0.1. Moreover, the bandgap of these alloys can be adjusted in the infrared range. This has the potential to extend Si-based materials to infrared application. However, the epitaxial growth of GeSn on Si substrates has several challenges...
Few-mode fibers offer high optical power handling capability that enables improvement of the RF gain, noise figure and dynamic range of analog fiber-optic links. We demonstrate the advantages in both single-channel and WDM transmission over few-mode fiber links.
Using a wavelength division multiplexer, we increase the spectral bandwidth of a multimode-fiber-based spectrometer to 100nm with the spectral resolution of 0.03nm. An effective algorithm is developed to achieve fast, accurate reconstruction of diversified spectra.
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