To obtain relationship between concentration of SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> decomposed characteristic components (or their ratio) during the formation process and partial discharge qualities pulse repetition rate, this paper used needle-plate electrode to simulate outthrust insulation fault conducted a serial experiments. First, decomposition under different PD strengths is obtained. Then defines average per second...

Multi-direction impact forging (MDIF) was applied to the as-extruded ZK60 Mg alloy, and microstructure, texture evolution yield strength symmetry were investigated in current study. The results showed that average grain size of forged piece greatly refined 5.3 µm after 120 passes, which ascribed segmenting effect {10–12} twins subsequent multiple rounds dynamic recrystallization (DRX). A great deal activated at beginning MDIF process, played an important role refinement. With proceeding,...

We present detailed modeling and experimental results for an improved design of InGaAsP-InP wavelength demultiplexer based on a monolithically integrated Rowland circle grating. The incorporated ten channels at 1.55 /spl mu/m with uniform spacing 2 nm. total on-chip loss was about 10 dB the crosstalk between adjacent as low -25 dB. It shown that low-loss etched turning mirrors can reduce by 4 compared to traditional 90/spl deg/ curved multimode waveguides. By replacing standard flat grating...

A new semiconductor laser structure with digitally switchable wavelength is proposed. The device comprises two coupled cavities different optical path lengths, which form V-shaped branches a reflective 2x2 half-wave coupler at the closed end. designed to have pi-phase difference between cross-coupling and self-coupling so as produce synchronous power transfer functions. High single-mode selectivity achieved by optimizing coupling coefficient. range greatly increased using Vernier effect....

We demonstrate an ultrahigh sensitivity silicon photonic biosensor based on cascaded Mach-Zehnder interferometer (MZI) and ring resonator with the Vernier effect using wavelength interrogation. Experimental results show that sensitivities reached 2870 nm/RIU 21,500 for MZI sensor MZI-ring sensor, respectively. A biosensing application was demonstrated by monitoring interaction between goat antigoat immunoglobulin G (IgG) pairs. The measured 1 ng/ml IgG resulted in 0.035 nm 0.5 shift This...

This paper aims to explore the decomposition characteristics of SF6 under thermal fault, which can further improve method using decomposed components diagnose inner insulation status insulated equipment. Hence, fault simulation system electrical equipment is designed and serials experiments are conducted. It initially gets characteristic for temperature below 400°C. Then it analyzes component species their generation regularity, determines main chooses key represent severity. The result...

A highly sensitive optical waveguide sensor based on simple intensity interrogation with a broadband light source is proposed and investigated. It consists of two cascaded microring resonators the same or slightly different free spectral ranges. The variation refractive index analyte sample results in large shift envelope function transmission peaks sensor, and, consequently, change transmitted power. low-cost sensing scheme can achieve an ultrahigh sensitivity 2 × 10⁴ dB/RIU. Experimental...

Tunable semiconductor lasers are often listed in critical technology road maps for future dense-wavelength-division-multiplexing (DWDM) systems and high-performance computing systems, they increasingly demanded long-haul, metropolitan, access networks. The capability to produce such directly on silicon (Si) could boost the use of Si photonics facilitate adoption optical data transmission even at chip scale. Moreover, just as a cheap large-diameter substrate device production is very...

As appropriate alternatives to precious metals in volatile organic compound (VOC) combustion, La-based perovskites have attracted increasing attention due their tunable structure and sintering-resistance capacity. Herein, chemically tailored surface Co-enriched LaCoO3 perovskite oxides (LCO) with abundant defects were successfully constructed via a facile selective acid-etching method, which lanthanum located at the A-site was preferentially dissolved exsolved cobalt opportunely dispersed on...

Intermixing the wells and barriers of quantum-well (QW) laser heterostructures generally results in an increase bandgap energy is accompanied by changes refractive index. A technique, based on ion implantation-induced QW intermixing, has been developed to enhance intermixing (QWI) rate selected areas a wafer. Such processes offer prospect powerful simple fabrication route for integration discrete optoelectronic devices forming photonic integrated circuits.

A theoretical demonstration of optical bistability in periodic layered media, particularly long-period GaAs/AlAs superlattices is presented. The proposed structure consists a multilayer system, as opposed to previously demonstrated nonlinear bistable devices which employed Fabry-Perot etalons. resonance effect essential for is, this case, induced by refractive index modulation. active medium distributed the whole rather than placed between two mirrors cavity. It shown complete calculation...

We study the scattering of light by longitudinal-acoustic phonons propagating along axis an infinite superlattice. In contrast to previous works, we take into account not only difference between acoustic and photoelastic parameters two media, but also their refractive indexes. this case incident scattered in superlattice are represented Bloch waves instead plane waves. The intensities, calculated closed form using a transfer-matrix method, then valid for any value wave vector q limited...

A digital microfluidic dye laser that integrates a Fabry–Perot cavity with two fiber-based mirrors is shown to exhibit single mode emission. In addition, fast switching achieved via the alternation of droplet streams contain different dyes. Single-longitudinal-mode emission observed for each wavelength (at 565 and 586 nm) linewidth narrower than 0.12 nm. This system appears thus well suited on-chip spectroscopy flow cytometry.

We demonstrate an integrated spectrometer-on-a-chip composed of echelle diffraction grating (EDG) and metal-semiconductor-metal (MSM) waveguide photodetector array based on silicon-on-insulator (SOI). In the passive section, silicon oxynitride (SiON) is chosen as material for core deposited after selectively removing top layer SOI wafer. The buried dioxide wafer functions lower cladding SiON waveguide. active MSM fabricated with a pitch width 7.5 μm. With butt-coupling structure,...

We report simple and compact V-cavity semiconductor laser capable of full-band wavelength tuning. A half-wave coupler is used to obtain high side-mode suppression ratio (SMSR) without any grating or epitaxial regrowth. Temperature induced gain spectrum shift employed in combination with the Vernier tuning mechanism extend range beyond free spectral limit. Wavelength 50 channels at 100GHz spacing SMSR up 38 dB has been demonstrated. show that a temperature variation 35°C, can be extended by...

We report the first experimental demonstration of a single-electrode-controlled digitally wavelength switchable V-coupled-cavity laser with high side-mode-suppression-ratio (SMSR) in 40 dB range. Sixteen-channel and twenty-six channel lasers 100 GHz spacing are demonstrated maximal SMSR 37 dB, respectively. They do not require complex gratings, multiple epitaxial growths, or tuning algorithms. The device size is only 500 μm×300 μm. Such simple, compact, high-performance has great potential...

The reflectance, transmittance, and absorptance of GaAs nanowire (NW) arrays are calculated by solving Maxwell's equations using the finite element method. model is compared with measurement results from well-ordered periodic NW fabricated dry etching. also reflectance measured NWs grown Au-assisted vapor-liquid-solid optimum diameter, periodicity (spacing between NWs), length determined to maximize AM1.5G solar spectrum short circuit current density in a array cell. period, were 180 nm, 350...

We demonstrate ultrahigh-sensitivity silicon photonic sensors based on two cascaded double-ring resonators operating in transverse-magnetic mode. Both wavelength interrogation and intensity methods are experimentally investigated the sensitivities reached 24,300 nm/RIU 2430 dB/RIU, respectively. also show that can be simply to realize simultaneous detection of multiple species, which is very promising for low-cost array applications.

A silicon nitride waveguide is a promising platform for integrated photonics, particularly due to its low propagation loss compared other complementary metal–oxide–semiconductor compatible waveguides, including silicon-on-insulator. Input/output coupling in such thin optical waveguides key issue practical implementations. Fiber-to-chip grating couplers usually exhibit efficiency because the moderate index contrast leads weak radiation strengths and poor directionality. Here, we present...

We propose a highly-sensitive temperature sensor employing Mach-Zehnder interferometer (MZI) based on silicon-on-insulator (SOI) platform. The waveguide widths in the two MZI arms are tailored to have different sensitivities but nearly same group refractive indices. A with an enhanced sensitivity of larger than 438pm/°C is experimentally demonstrated, which over seven times that conventional silicon optical (about 60pm/°C for quasi-TM mode). Moreover, easy fabricate, only by single mask, and...