Polycrystalline SnO2 film of tetragonal rutile structure with an optical band gap 3.9eV was formed by oxidation process at 1000°C on electron beam evaporation deposited Sn film. Room temperature electroluminescence from the SnO2∕p-Si heterojunction observed 590nm when device under sufficient forward bias positive voltage applied p-Si substrate. It is proposed that electrons in conduction relax to defect states resulted dangling bonds surface small grains and then radiatively recombine holes...

Abstract Background To explore the efficacy of a prediction model based on diffusion‐weighted imaging (DWI) features extracted from deep learning (DL) and radiomics combined with clinical parameters apparent diffusion coefficient (ADC) values to identify microsatellite instability (MSI) in endometrial cancer (EC). Methods This study included cohort 116 patients EC, who were subsequently divided into training ( n = 81) test 35) sets. From DWI, conventional convolutional neural network‐based...

Chirp characteristics of Silicon Mach-Zehnder Interferometer (MZI) modulators with forward-biased p-i-n and reverse-biased p-n structures are investigated by performing small-signal simulation, respectively. Simulation result shows that the chirp parameter is negative influenced carrier absorption effect, amplitude, frequency applied sinusoidal modulating signals. performance at 10 GHz modulation can be obtained utilizing depletion mode structure. Finally, a way to further lower absolute...

The microring-assisted (MRA) Mach-Zehnder (MZ) modulator offers a potential solution to attaining highly linear optical modulators. In this paper, the influence of waveguide loss on linearity property MRA-MZ is analyzed. way choose biasing points introduced. Analysis shows that high, even at low-loss conditions. By properly setting phases, 2nd- and 3rd-order harmonic terms modulation curve can be removed. range reach 90% when round-trip microring less than 3 dB. maximum depth main factor...

Utilizing the thermooptical effect of polymers, a compact variable optical attenuator (VOA) based on multimode interference (MMI) is demonstrated. By directly modulating in MMI region according to overlapping imaging MMI, attenuation achieved. The device length less than 6 mm. experiment shows that VOA has 25-dB at driving power only 7.8 mW. response time around 3-4 ms. polarization-dependence loss 0.3 and 0.8 dB when 15 about 20 dB, respectively.

A two-dimensional multimode-interference optical power splitter is designed and demonstrated. The new device can be used for the splitting in two transverse directions. Silicon-on-insulator technology utilized to fabricate device. performance of tested.

Propagation constant errors (PCEs) of guided modes in regions multimode interference optical networks were analyzed. Results show that a graded-index waveguide can effectively decrease the PCEs. An example based on an exponential function is presented. Numerical results addition greatly improves device performance this structure.

Due to the rapid growth of distribution systems in urban areas, increasing complexity these brings challenges accurate topology identification. The collected voltage data from smart meters have been proven effective identification applications. However, when multiple feeders are connected same bus, accuracy existing voltage-correlation-based can be degraded significantly. To address this challenge, a comprehensive inference method is proposed article identify <sc...

A novel magneto-optical (MO) waveguide with a nanoscale air gap (NAG) is presented. By using an NAG, the nonreciprocal phase shift (NPS) of MO can be enhanced. linear transition model proposed to theoretically explain NPS NAG. Simulation result shows that when NAG thickness less than 10 nm, exhibits more four times without

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> By implanting nonreciprocal phase shifts (NPS) into a ring-coupled Mach–Zehnder interferometer (RCMZI) structure, wavelength-selective isolation can be obtained over wideband range. Different transmission lineshapes and structures of the RCMZI were examined to meet requirements multiwavelength usage. It was demonstrated that with high-peak could achieved just reciprocal arm linear in MZI...

Low-loss glass-based buried multimode waveguides are fabricated by using the field-assisted Ag+-Na+ ion-exchange technique, and optical power splitters investigated. The measured loss of is lower than 0.1dB/cm, additional 1.3 dB under uniform splitting condition.

This paper presents a multiband reconfigurable low noise amplifier (LNA) based on dual-feedback common-gate (CG) configuration. The input impedance of the LNA is tuned synchronously with output load due to reflection by proposed source-follower positive feedback method. method also improves stability LNA, which an issue in conventional methods. In addition, both and negative capacitor cross-coupling help reduce figure. Fabricated TSMC 0.18 µm CMOS process, measurement results show from 1.833...

Based on the guided-mode propagation analysis method and self-imaging effect, general imaging properties of two-dimensional multimode interference coupler (2-D MMI) are generalized discussed. The formulas for positions, intensities, phases self-images, image overlap in 2-D MMIs derived. numbers, self-images directly related to position input field positional number. can be regarded as superposition two orthogonal one-dimensional effects. These results verified by analysis.

The thermo-optic effect in the lateral-carrier-injection pin junction SOI ridge waveguide is analyzed according to thermal field equation. Numerical analysis and experimental results show that caused by carrier injection significant such devices, especially for small structure ones. For a device with 1000 μm modulation length, refractive index rise introduced heat accounts 1/8 of total under normal working conditions. A proposal adjusting electrode position cool devices diminish...

Using 0.8μm industrial CMOS technology, a 1×2 optical switch based on the carrier dispersion effect was fabricated. The device employed conventional P-I-N structure with typical 1μm-wide waveguide. main process flow is presented in detail. switching extinction ratio and speed of are 21dB 20ns, respectively. fabrication repeatability stable reliable.

Based on the principle of graded-index multimode interference (MMI), an 8×8 MMI optical coupler is designed and fabricated by using K+-Na+ion-exchange technique a BK7 glass substrate. The performance device tested. output has high uniformity approximately 0.72 dB.

The beam-propagation characteristics of the total internal reflection (TIR) induced by thermo-optic effect are investigated. Based on Fourier heat-transmission principle and variable separation method, we derive an analytical transient expression thermal field for general devices. With expression, time response steady-state temperature distribution devices presented. beam expansion rule TIR in is developed mathematically, a quantitative calculation given as well. To illustrate application...

This paper presents a 6-bit 38 GHz vector-summing phase shifter developed for 5G phased array communications. A linear gain adjustment VGA with modified control method is presented and used in vectors weighting. Combined degenerated-Q quadrature all-pass filter (QAF) accurate I/Q generation, high resolution achieved easy compact size. Fabricated 0.13 um SiGe BiCMOS process, the has measured average insertion loss of 5.7 dB at center frequency, −3 bandwidth 12 GHz. The RMS errors are less...

In order to accurately recognize the degradation state of rolling bearing, a hybrid method combining Genetic Algorithm(GA)and Support Vector Machine (SVM) was proposed,and model for recognition bearing constructed.Firstly feature vectors were extracted through combination GA and SVM from statistical characteristic.Then probability distribution historical remn ant life are calculated deter mine optimal number state, whi ch is employed construct deg radation recognition.Finally characteristic...