Xiaopeng Dong

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Electromagnetic emissions were measured from several radio receivers to demonstrate the possibility of detecting and identifying these devices based on their unintended emissions. Radiated fields from the different radio receivers have unique characteristics that can be used to identify these devices by analyzing time-frequency plots of measured radiation.(More)
A Mach-Zehnder interferometer based on a twin-core fiber was proposed and experimentally demonstrated for gas pressure measurements. The in-line Mach-Zehnder interferometer was fabricated by splicing a short section of twin-core fiber between two single mode fibers. A micro-channel was created to form an interferometer arm by use of a femtosecond laser to(More)
We proposed and experimentally demonstrated a twin-core fiber (TCF)-based Mach-Zehnder interferometer (MZI) to develop an ultrasensitive refractive index (RI) sensor. This fiber MZI was constructed by splicing a short section of TCF between two sections of single mode fibers. A microchannel was drilled through one core of the TCF by means of femtosecond(More)
An improved algorithm for trace C(2)H(2) detection is presented in this paper. The trace concentration is accurately calculated by focusing on the absorption spectrum from the frequency domain perspective. The advantage of the absorption spectroscopy frequency domain algorithm is its anti-interference capability. First, the influence of the background noise(More)
Curved corannulene (Cor) can produce reactive oxygen species (ROS) in a controlled manner due to the large dipole moment. However, the poor aqueous solubility of Cor necessitates the employment of solubilization vehicles. This work revealed that PEGylation was less efficient than the cyclodextrin complexation regarding ROS production.
The phenomenon of spatial frequency doubling generated by a two-step technique with the collimated beam at normal incidence in the second exposure is presented. Theoretical analysis demonstrates that the phenomenon is induced by the Talbot effect in photoresist and the superposition of two exposures, and the minimum achievable period of the grating with(More)
The topology of hydrophobic moieties can affect the stability of self-assembled micelles. Curved corannulene and flat perylene were selected as model hydrophobic molecules with poly(ethylene glycol) as the hydrophilic segment. The curvature can enhance the intermolecular π-π interaction, and hence the driving force of micelle formation.
An all-fiber tunable bandpass filter (TBPF) based on cascaded twin-core fiber (TCF) is theoretically analyzed and experimentally demonstrated. The spectrum of this proposed TBPF can be easily adjusted by bending, twisting, stretching, or changing the length of TCF to achieve the required filter parameters. In the example of a TBPF fabricated with TCF, the(More)
A novel broadband LP01↔LP02 mode converter for dispersion compensation based on special dual-core fiber is theoretically investigated by using the coupled-mode theory. The simulated mode converter has ∼22  nm bandwidth with a conversion efficiency of over 80%. Furthermore, this noncomplete conversion only introduces the insertion loss rather than multipath(More)
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