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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...
An on-wafer and self-calibrated scheme is proposed and demonstrated for self-referenced microwave characterization of a silicon integrated optical transceiver. The proposed self-calibration method enables on-wafer selective extraction of microwave characteristic parameters of high-speed modulators and photodiodes in the integrated optical transceiver, without the need for extra electrical-to-optical...
This paper describes the fabrication and high speed characterization for uni-traveling-carrier photodetectors (UTC-PD) with dipole-doping layers. The dipole-doping InGaAs/InP layer has been introduced at the InGaAs (absorption layer) and InP (collection layer) interface to prevent current blocking in our UTC-PD devices. These UTC-PDs have achieved high photocurrent of 52 mA, high responsivity of 0...
A compact conformal planar inverted-F antenna (PIFA) array, working at UHF band, is presented in this paper. This array consists of four PIFA elements. The parallel feeding network has been designed to drive the elements. The size of the proposed array is 100.5 mm × 48 mm. The proposed antenna is fabricated on a very thin substrate with a thickness of 0.254 mm, which is benefit for conformal structure...
Terahertz surface plasmon polaritons propagating in semiconductor surfaces have been explored for the study of plasma frequency measurement, carrier density and surface defects. We also highlight to possibility of studying biochemical thin films using Terahertz spectroscopy.
In this paper, a "V"-type structure of ±45° dual-polarized broadband base station antennas is presented. The simulated and measured results show that the antenna can cover 30% of the bandwidth when the VSWR is less than 1.4. Good radiation characteristics of the antenna are also observed, such as the cross-polarization ratio which is below -18dB at axis, -15dB at±60° and the front to back...
A novel circular polarized patch antenna with modified T-probe fed structure is proposed. By replacing the bent part of a T-probe with a printed strip on the substrate and by placing a radiating patch beneath the substrate, the proposed antenna can be more easily fabricated by using the printed technology. The simulation and experimental results show that the modified T-shaped probe single-fed CP...
In this paper, the reduction of mutual coupling between two microstrip patch antennas is presented by implementing a novel parasitic structure. The measured results show that a 21 dB mutual coupling reduction was obtained in the bandwidth of 2.2% without affecting the radiation patterns obviously. This structure can be easily integrated into an adaptive antenna array to improve the null depth, or...
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