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This paper reports results of the simulation of an optical phase modulator. The proposed modulator consists of an elongated p-i-n structure fabricated in a silicon-on-insulator material such as SIMOX. It utilizes the free-carrier effect to produce the desired refractive index change in a single-mode optical rib waveguide. The MEDICI two-dimensional semiconductor device simulation package has been employed to optimize the overlap between the injected free carriers and the propagating optical guided mode. Although the device is designed to support a single optical guided mode, it measures several micrometers in cross-sectional dimensions, thereby simplifying fabrication and allowing efficient coupling to/from other single-mode devices. Furthermore, the device has an extremely high figure of merit, predicting over 200" of induced phase shift per volt per millimeter, as well as a low drive current of less than 10 mA. This is approximately an order of magnitude lower than most other reported devices in silicon.

Electrocardiogram (ECG) signal feature extraction is important in diagnosing cardiovascular diseases. This paper presents a new method for nonlinear feature extraction of ECG signals by combining principal component analysis (PCA) and kernel independent component analysis (KICA). The proposed method first uses PCA to decrease the dimensions of the ECG signal training set and then employs KICA to cal-B Hongqiang Li Circuits Syst Signal Process culate the feature space for extracting the nonlinear features. Support vector machine (SVM) is utilized to determine the nonlinear features of the ECG signal classification. Genetic algorithm is also used to optimize the SVM parameters. The proposed method is advantageous because it does not require a huge amount of sampling data, and this technique is better than traditional strategies to select optimal features in the multi-domain feature space. Computer simulations reveal that the proposed method yields more satisfactory classification results on the MIT-BIH arrhythmia database, reaching an overall accuracy of 97.78 %.

Chip-scale demonstration of hybrid III-V/silicon photonic Chip-scale demonstration of hybrid III-V/silicon photonic Chip-scale demonstration of hybrid III-V/silicon photonic integration for an FBG Chip-scale demonstration of hybrid III-V/silicon photonic integration for an FBG interrogator interrogator

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