Abstract Mid-infrared (MIR) optical frequency combs can be used as coherent light sources in various fields, including molecular detection and communication. However, convenient generation of portable MIR remains challenging, mainly limited by practical pump accessible integrated devices. Here, we present an efficient method towards microcomb using cascaded high-speed electro-optic (EO) modulators. Through making full use the EO effect thin-film lithium niobate flexibility segmented...

We propose a high-temperature sensor based on suspended-core microstructured optical fiber (SCMF). The is constructed by fusion splicing piece of SCMF between two sections multimode fibers (MMFs) which act as light beam couplers. interference formed the air cladding modes and silica core in SCMF. Fast Fourier transform adapted to filtering raw transmission spectra MMF-SCMF-MMF structure. wavelength shift dominant spatial frequency monitored temperature varies from 50 °C 800 °C. sensitivities...

Heterogenous integration has become a sought-after solution for the semiconductor industry to achieve system level PPACt™ (chip Performance, Power, Area, Cost and time market) advancement. Wafer-to-Wafer hybrid bonding allows one high vertical interconnect density, enabled by small bond pad CD, tight pitch, percentage of Cu areal density. This paper showcases robust flow wafer-to-wafer with SiCN interface at 0.5 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML"...

3D integration by adopting wafer-to-wafer (W2W) or chip-to-wafer (C2W) direct bonding techniques scales up interconnect density. Heterogenous enabled technology brings wafers chips with different functionalities into close proximities, thus providing system performance benefits such as faster I/O speed and lower power consumption, etc. We have previously reported a robust flow high electrical yield for 300mm hybrid SiCN interface at 0.5 μm bond pad pitch [1]. was chosen the layer to harness...

GaAs was grown directly on silicon by molecular beam epitaxy (MBE) at low substrate temperature (/spl sim/250/spl deg/C). Both the wafer cleaning and film growth processes were done temperatures lower than Si-Al eutectic to enable monolithic integration of low-temperature-GaAs photoconductive switches with finished Si-CMOS circuits. The surfaces show less 1 nm rms roughness anti-phase domain density is below detection limit X-ray diffraction. Metal-semiconductor-metal made using this...

A configuration based on a parallel double Fabry-Perot interferometers (FPIs) is proposed and experimentally demonstrated to enhance the temperature sensitivity by Vernier-effect. Two separated FPIs constructed suspendedcore microstructured optical fiber (SCMF) are connected 3-dB coupler form structure. FPI-2 used for sensing, while FPI-1 as reference. With increasing from 40 °C 220 °C, both fine interference fringes envelope have linear redshift. This doubleFPIs shows an enhanced of 153.8...

Vibration energy harvesting attempts to generate electricity through recycling the discarded vibration that is usually lost or dissipated, and represents an alternative traditional batteries may even lead reliable self-powered autonomous electronic devices. Energy based on magnetostrictive materials, which takes advantage of coupling characteristics Villari effect Faraday electromagnetic induction effect, a recent research field great interest. Aiming develop new type harvester using Fe-Ga...

In this paper, we realize tunable Fano and electromagnetically induced transparency (EIT)-like resonances in the outputs of a nested feedback ring resonator. Compared with traditional add-drop resonator, arm introduces interference between different resonance modes. Using coupled mode theory, reveal that output are discrete modes continuum modes, whereas EIT-like only appears over-coupled state. We experimentally confirm two effects using optical fiber resonators, finding effect can be...

A high-temperature sensor based on a parallel double-Fabry–Pérot interferometer (FPI) structure is reported. The Vernier effect produced in the double-FPI to enhance temperature sensitivity. sensing FPI (SFPI) fabricated by fused splicing of suspended-core fiber and single-mode (SMF). Tip package technology for SFPI means that part not subjected disturbance from external medium. reference (RFPI) an air cavity constructed inserting two SMFs into hollow core tube; thus magnification can be...

This paper proposes an improved UNet segmentation algorithm to further improve the performance and adaptability meet problems such as complex retinal blood vessel structures, low image contrast, inaccurate of detail areas. To achieve this goal, two main strategies are adopted which residual module introducing depthwise separable convolution SE (Squeeze Excitation) attention mechanism. First, a new is designed by combining convolutional network replace traditional operation in original UNet....

By linking the unique capabilities of photonic devices with signal processing power electronics, photonically sampled analog-to-digital (A/D) conversion systems have demonstrated potential for superior performance over all-electrical A/D systems. We adopt a scheme using low-temperature (LT)-grown GaAs metal-semiconductor-metal (MSM) photoconductive switches integrated Si-CMOS converters. The large bandwidth LT and low timing jitter short width mode-locked laser pulses are combined to...

In high-speed analog-to-digital conversion of microwave bandwidth signals, jitter on the sampling pulse train limits speed and resolution. The use a mode-locked laser to minimize has been previously reported; in such previous study, pulses are converted electrical through photoconduction. Here, we report initial results technique which is performed by photoelectron emission. electron serves as comb emitted from photocathode illuminated 266-nm 1.3-ps pulses. Each deflected analog voltage...

A tip packaged high-temperature miniature sensor constructed by a suspended-core optical fiber (SCF) is presented and experimentally demonstrated. An SCF with short length spliced to the single-mode (SMF) utilized build Fabry-Perot interferometer (FPI). section of SMF acting as package end SCF, which gives immunity external refractive index (RI). The test processes heating up cooling down are repeated three times evaluate repeatability hysteresis. arithmetic means temperature sensitivity...

We demonstrate a novel GaAs-metal-semiconductor-metal (MSM)-based wavelength-selective photodetector integrated with its complementary metal-oxide-semiconductor (CMOS) driver and receiver. This receiver has /spl sim/1-ns wavelength switching access time been shown to detect 4 bits of 460-Mb/s (2.17-ns bit period) emulated data in nonreturn-to-zero format during the enabled 8.68-ns windows. The demonstrated channel spacing is sim/70.8 GHz. To our knowledge, this fastest reported for tunable optical

A high-sensitivity optical fiber sensor for low refractive index (RI) measurement is proposed and experimentally demonstrated. It fabricated by fused splicing a section of multimode (MMF) between two single-mode fibers (SMFs) with slight offset at joints, then the MMF tapered using tapering technology. The SMF can effectively excite more high-order modes. (TMMF) enhance strength evanescent field promote interplay modes surrounding medium. experimental results indicate that value waist...

A novel electrically controlled tunable metal-semiconductor-metal (MSM) photodetector is introduced and experimentally demonstrated with 2.5-ns wavelength-switching access time on a GaAs chip for switching between two wavelengths. This detector has 20.1-dB ON/OFF contrast ratio the selected rejected wavelength can resolve 179-GHz spaced wavelength-division multiplexing channels. In addition, device achieved differential input voltage swing of /spl plusmn/1.65 V. low bias makes it compatible...

In this Letter, Autler-Townes splitting and induced transparency windows are observed in a multimode microfiber knot. The knot is fabricated using tapered single-mode fiber, with the position located at transition area of fiber. spectrum, analogy to splitting, derives from mode two high-order excited modes, which theoretically explained by transfer matrix method. Moreover, without adding resonators, realized tunable coupling coefficients phase difference modes. tunable, easily fabricated,...

As a novel portable and robust broadband coherent light source, mid-infrared (MIR) Kerr microresonator-based frequency combs (microcombs) have prospective applications in the precision spectroscopy of molecules biochemical sensing. The mature integrated silicon photonics platform is well suited for MIR microcombs study because has both large linear nonlinear refractive index, but transparency window limited by cladding material. Here, we numerically demonstrate generation comb microring...