In this paper, we review the current status of hybrid silicon photonic integration platform with emphasis on its prospects for increased complexity. The is maturing fast as increasingly complex circuits are reported tens integrated components including on-chip lasers. It shown that well positioned and holds great potential to address future needs medium-scale circuits.

The mode conversion in tapered submicron silicon ridge optical waveguides is investigated theoretically and experimentally. Two types of waveguide tapers are considered this paper. One a regular lateral taper for which the width varies while etching depth kept same. other so-called "bi-level" taper, includes two layers tapers. Mode between TM fundamental higher-order TE modes observed silicon-on-insulator due to hybridization resulting from asymmetry cross section. Such could have very high...

We present design, fabrication, and characterization of a silicon-on-insulator grating coupler high efficiency for coupling between silicon nanophotonic waveguide single mode fiber. By utilizing the lag effect dry etching process, consisting nonuniform grooves with different widths depths is designed fabricated to maximize overlapping upward wave fiber mode. The measured waveguide-to-fiber 64% (-1.9 dB) transverse electric polarization achieved by directly defined on regular wafer.

A distributed III-V-on-Si electroabsorption modulator based on an asymmetric segmented electrode has been developed the hybrid silicon platform for 1.3 μm transmission window. The measured modulation response shows a 2 dB drop at 67 GHz and extrapolated 3 bandwidth of 74 GHz. Large signal measurements show clearly open eye diagrams 50 Gb/s. An extinction ratio 9.6 back to 9.4 after 16 km were obtained with drive voltage 2.2 V.

An ultra-short (∼10 μm long) polarization beam splitter (PBS) based on an asymmetrical bent directional coupler (DC) is demonstrated experimentally by using silicon-on-insulator nanowires. The DC designed to cross-couple TM polarized light completely while there almost no coupling for TE polarization. Grating couplers are introduced at both ends of the PBS efficient single-mode fibers. measurement results show that extinction ratios fabricated higher than 10 dB polarizations in a broad...

The device and integration technology for silicon photonic transmitters are reviewed in this paper. hybrid platform enables on-chip lasers to be fabricated with circuits can integrated the CMOS back-end flow. Laser arrays from multiple die bonding quantum well intermixing techniques demonstrated extend spectral bandwidth laser array of transmitter. Two modulator technologies, modulators modulators, also described.

In this paper we investigate reducing threshold and improving the efficiency speed of distributed feedback hybrid silicon lasers. A low current 8.8 mA was achieved for a 200 μm cavity at 20 °C. 3 dB bandwidth 9.5 GHz as well 12.5 Gb/s direct modulation DFB laser diode on platform first time.

We present both theoretical and experimental results of an ultracompact waveguide coupler that is capable highly efficient coupling light from strip waveguides to slot waveguides, vice versa. By optimizing the geometrical parameters, it possible achieve extremely low-loss coupling. A efficiency 97% has been obtained experimentally while keeping overall size down range below 10 mum. Further analysis shows proposed relatively high tolerance fabrication errors wavelength insensitive.

We have demonstrated a traveling-wave electroabsorption modulator based on the hybrid silicon platform. For device with 100 μm active segment, small-signal electro/optical response renders 3 dB bandwidth of around 42 GHz and its modulation efficiency reaches 23 GHz/V. A dynamic extinction ratio 9.8 driving voltage swing only 2 V was at transmission rate 50 Gb/s. This represents significant improvement for modulators compatible integration silicon-based photonic integrated circuits.

A grating waveguide is introduced and designed to serve as both a polarization splitter an efficient vertical coupler between fiber silicon-on-insulator (SOI) nanophotonic waveguide. Through this waveguide, the light from can be efficiently coupled into SOI chip where two orthogonally polarized waves are separated travel towards opposite directions along According our simulations, optimized structure give high coupling efficiency of about 50% for polarizations, well large bandwidth over 70...

A stable and uniform multi-wavelength fiber laser based on the hybrid gain of a dispersion compensating (as Raman medium) an Erbium-doped (EDF) is introduced. The competition effects in amplification (FRA) EDF are analyzed compared experimentally. FRA mechanism can suppress effectively make present at room temperature. medium also increase lasing bandwidth with pure laser) power conversion efficiency laser).

The dynamic polarizabilities of the $4s$, $3d$, and $4p$ states Ca${}^{+}$, are calculated using a relativistic structure model. wavelengths at which Stark shifts between different pairs transitions zero computed. Experimental determination magic can be used to estimate ratio ${f}_{3{d}_{J}\ensuremath{\rightarrow}4{p}_{{J}^{\ensuremath{'}}}}$ ${f}_{4{s}_{1/2}\ensuremath{\rightarrow}4{p}_{{J}^{\ensuremath{'}}}}$ oscillator strengths. This could prove valuable in developing better atomic...

We demonstrate experimentally the existence of magic wavelengths and determine ratio oscillator strengths for a single trapped ion. For first time, two near 396 nm ${^{40}\mathrm{Ca}}^{+}$ clock transition are measured simultaneously with high precision. By tuning applied laser to an intermediate wavelength between transitions $4{s}_{1/2}\ensuremath{\rightarrow}4{p}_{1/2}$ $4{s}_{1/2}\ensuremath{\rightarrow}4{p}_{3/2}$, sensitivity Stark shift is greatly enhanced. Furthermore, wavelengths,...

A one-dimensional grating serving both as a polarization beam splitter and vertical coupler for silicon photonic circuits is designed, fabricated, characterized. Bragg reflectors are employed to improve greatly the coupling efficiency. Over 50% efficiency polarizations achieved experimentally, extinction ratio between them also high ( -20 dB).

We report on the anisotropic expansion of ultracold bosonic dysprosium gases at temperatures above quantum degeneracy and develop a quantitative theory to describe this behavior. The expresses post-expansion aspect ratio in terms temperature microscopic collisional properties by incorporating Hartree-Fock mean-field interactions, hydrodynamic effects, Bose-enhancement factors. Our results extend utility imaging providing accurate thermometry for dipolar thermal Bose gases, reducing error...

A semi-empirical atomic structure model method is developed in the framework of a relativistic case. This starts from Dirac—Fock calculations using B-spline basis set. The core-valence electron correction then treated core polarization potential. As an application, properties alkali metal atoms, including static polarizabilities and long-range two-body dispersion coefficients, have been calculated. Our results are good agreement with obtained ab initio many-body perturbation available...

This letter demonstrates a high-speed and energy-efficient lumped electroabsorption modulator on the hybrid silicon platform for an uncooled operation at up to 80 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> C . 100-μm-long has 3-dB bandwidth of 30 GHz. Eye diagrams measured temperatures 20 , 40 C, 60 with corresponding adjustment input wavelength bias voltage show dynamic extinction ratio around 5 dB Gb/s 1-V drive swing energy...

An ultracompact tapered coupler, which is suitable for mode transformation between a 220 nm high silicon wire waveguide and Si/III-V hybrid waveguide, proposed heterogeneous integration. The coupler composed of three sections. Since the avoids exciting unwanted high-order modes in III-V length can be dramatically shortened. In structure, total trisectional as short 8 μm with fundamental mode-coupling efficiency over 95% bandwidth 100 nm. alignment tolerance structure also analyzed.

We review recent progress made on the hybrid silicon platform towards realizing an integrated WDM transmitter silicon. Using ion implantation enhanced quantum well intermixing, four band gaps are a single chip and used to demonstrate DFB laser-EAM array. The latest results design changes improve Mach-Zender EA modulator performance also described prospects for fabricating terabit per second presented.

In this paper, we report the relativistic Fock space multireference coupled-cluster method for atomic structure calculations. We use no-pair Dirac-Coulomb-Breit Hamiltonian, together with a finite $B$-spline basis set to expand large and small components of Dirac wave function. Our is applied calculate ionization energies, reduced matrix elements, lifetimes, polarizabilities many states francium. To evaluate uncertainties our results investigate role electron correlation effects, carry out...

Abstract: A cyclic pentapeptide c(Tyr‐Leu‐Ala‐Gly‐Pro) ( I ), which was isolated and identified from Pseudostellaria heterophylla medicinal herbs, two heptapeptides, c(Gly‐Tyr‐Gly‐Gly‐Pro‐Phe‐Pro) II ) c(Gly‐Ile‐Pro‐Tyr‐Ile‐Ala‐Ala) III were Stellaria yunnanensis Franch (M), synthesized by using 3‐(diethoxyphosphoryloxy)‐1,2,3‐benzotriazin‐4(3 H )‐one (DEPBT) as a coupling reagent in solution, mediated different metal ions, their linear peptide precursors H‐Tyr‐Leu‐Ala‐Gly‐Pro‐OH I‐1...

Applying cascade air source heat pumps (CASHPs) in colder areas is a promising option to encourage wider application of (ASHPs) due their advantage higher energy efficiency. When CASHPs are operated heating mode, frosting/defrosting has been problematic. This paper proposed novel thermal storage (TES) based reverse cycle defrosting method for which can provide and continuously supply the indoor space. The comparative experiments on its operating performances was carried out by comparing...