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A low-frequency electrical spectrum analysis method is researched for evaluating broadband characteristics of high-speed dual-parallel Mach-Zehnder modulators (DPMZMs) based on dual-frequency modulation and fixed-frequency bias. The method enables the broadband and high-resolution evaluation for the modulation depth and half-wave voltage of a high-speed DPMZM by using a low-frequency photodetector...
A hybrid tuning method for microwave filters with asymmetric phase shift effects is presented in this paper. This novel tuning technique is based on the combination of the modified Cauchy method and aggressive space mapping (ASM) technique. After remove the phase shift effect, Cauchy method is applied to determine the characteristic polynomials of the filter's response. Then the parameters (coupling...
A practical method for extracting the coupling matrix from measured or electromagnetic simulated S-parameters of narrow band cross-coupled filters with large losses is presented in this paper. The method can be applied to computer-aided tuning or computer-aided design of microwave filters to accelerate the filter design and physical implementation. The modified band-pass to low-pass transformation...
A lossy filter rational model extraction technique based on modified Cauchy method is presented in this paper. The conventional Cauchy method is only for lossless case, not suitable for lossy filter. The rational polynomials model is the prerequisite to synthesize the low-pass prototype (the evaluation of the coupling matrix) for computer-aided tuning. To this purpose, we modify the conventional Cauchy...
Compressive sensing (CS) is a novel signal sampling theory and it can recover sparse or compressive signals with lower rates than their Nyquist rates. Greedy pursuit algorithms are important recovery algorithms in CS. In this paper, we study the performance of subspace pursuit (SP) greedy algorithm and propose a modified SP termed as regularized multipath subspace pursuit (RMSP), which divides the...
Linear Diffraction Grating Interferometer (LDGI) is a long stroke and nanometer resolution displacement sensor for any linear stages. The principle of this diffractive interferometer is based on the Littrow configuration and phase information encoded by the ±1st order beams diffracted by a holographic grating. Because the emitted beams are separated on the grating plane, the yaw error of the stage...
We report a novel microfluidic surface-enhanced Raman scattering (SERS) device, which is achieved by bonding a polydimethylsiloxane cap with a microchannel structure onto an SERS-active substrate composed of noble-metal covered silicon nanopillar forests. The silicon nanopillar forests are fabricated by using nanomaterial dots, which are introduced in oxygen-plasma bombardment of photoresist, as etching...
This paper reports for the first time a novel highly-ordered three-dimensional (3D) petal-like arrayed structure (PLAS) which can serve as an ideal substrate for surface-enhanced Raman scattering (SERS). The structure is achieved by anisotropically etching a hexagonal close-packed silica nanoparticle (SNP) bilayer coated on a silicon substrate through evaporation-induced self-assembly, and then depositing...
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