Xingyuan Xu

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This paper studies the sensitivity of stress-enhanced transistor performance to layout variations. Stress simulations and mobility models are calibrated and verified for test structures with SiGe source/drain as a stressor. The role of STI on the stress transfer is explored. The numerical results show that variations of 15% in drive currents and of 44% in(More)
Dendritic cells (DCs) and invariant natural killer T (iNKT) cells play important roles in linking innate immunity and adaptive immunity. Mature DCs activated by Toll-like receptor (TLR) agonists directly activate iNKT cells and the iNKT ligand α-galactosylceramide (α-Galcer) can induce DC maturation, resulting in enhanced protective immune responses. In the(More)
The mechanisms underlying lymphocyte lineage stability and plasticity remain elusive. Recent work indicates that innate lymphoid cells (ILC) possess substantial plasticity. Whereas natural ILC2 (nILC2) produce type-2 cytokines, plastic inflammatory ILC2 (iILC2) can coproduce both type-2 cytokines and the ILC3-characteristic cytokine, IL-17. Mechanisms that(More)
An ultraflat self-oscillating optical frequency comb generator based on an optoelectronic oscillator employing cascaded modulators was proposed and experimentally demonstrated. By incorporating the optoelectronic oscillation loop with cascaded modulators into the optical frequency comb generator, 11 ultraflat comb lines would be generated, and the frequency(More)
In this letter, we proposed and experimentally demonstrated a novel self-oscillating triangular pulses generator based on dual-parallel Mach-Zehnder modulator (DPMZM). The fundamental harmonic of triangular pulses is produced by self-oscillating optoelectronic loop. Even-order harmonics suppression and phase-shifting of the odd-order harmonics are(More)
In this paper, we proposed and experimentally demonstrated a novel bias drift free optoelectronic oscillator (OEO) based on Sagnac loop. In the experiment, we built a Sagnac loop as the modulator of OEO where a phase modulator was used to introduce non-reciprocity without bias drift problem. 10 GHz microwave signals with relatively pure spectrum were(More)
A dynamic compensation scheme based on fixed servo-control loop is proposed and demonstrated in the present paper to improve the long-term stability of the wideband and tunable optoelectronic oscillator. Low frequency reference is employed to monitor and extract the phase drift of the long fiber link. The frequency drift of the OEO is compensated by tuning(More)
In this letter, a self-oscillating triangular waveform generator based on an optoelectronic oscillator (OEO) was demonstrated. As a result, 5.35 GHz full-duty-cycle triangular pulse trains were generated via a phase modulator cascaded with a Mach-Zehnder interferometer. Microwave signals were also generated with phase noise of −124dBc/Hz at 10 kHz(More)
In this Letter, we propose and experimentally demonstrate a novel broadband and wide-range feedback tuning scheme for phase-locked loop (PLL) stabilization of tunable optoelectronic oscillators (OEO). The proposed scheme was realized in a simple and feasible way based on a dual-parallel Mach-Zehnder modulator (DPMZM) and optical bandpass filter (OBPF). The(More)
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