Tunable microwave signal generator with an optically-injected 1310nm QD-DFB laser

Tunable microwave signal generation with frequencies ranging from below 1 GHz to values over 40 GHz is demonstrated experimentally with a 1310nm Quantum Dot (QD) Distributed-Feedback (DFB) laser. Microwave signal generation is achieved using the period 1 dynamics induced in the QD DFB under optical injection. Continuous tuning in the positive detuning frequency range of the quantum dot's unique stability map is demonstrated. The simplicity of the experimental configuration offers promise for novel uses of these nanostructure lasers in Radio-over-Fiber (RoF) applications and future mobile networks. © 2013 Optical Society of America

Photonic-Enabled Microwave and Terahertz Communication Systems

An optical heterodyne technique for generating millimetre-wave and THz carriers with high spectral purity and low phase noise is described, for application to Gb/s wireless communications systems. Progress on key integrated optical components is reported. (C) 2008 Optical Society of Americ

Photonic-Enabled Microwave and Terahertz Communication Systems

Abstract: An optical heterodyne technique for generating millimetre-wave and THz carriers with high spectral purity and low phase noise is described, for application to Gb/s wireless communications systems. Progress on key integrated optical components is reported. Introduction Microwave photonics research [1] has found applications in areas as diverse as electronic warfare and medical imaging, and the development of wireless-over-fibre systems for distribution of cellular radio and other wireless signals within large buildings and other areas where coverage from conventional hill-top sites is poor, has proved to be of considerable commercial importance, with sales of systems reaching some $250 m annually. Now, with wireless local area networks (LANs) ubiquitous and demand for higher wireless transmission rates using IEEE 802.16 and similar standards growing, new potential applications for photonics in wireless communications are emerging, to generate, modulate and detect signals at higher carrier frequencies (>60 GHz) that can support Gb/s data rate

Purification and Characterization of Fatty Acyl-Acyl Carrier Protein Synthetase from Vibrio-Harveyi

No abstract available

Exercise hemodynamic and neurohormone responses as sensitive biomarkers for diltiazem in rats

Purpose. To investigate the potential of exercise hemodyanamic and neurohormone variables as sensitive biomarkers for pre-clinical evaluation of diltiazem (DTZ). Methods. Sprague Dawley (SD) rats were randomly divided into 3 groups (n = 6-8 each), and each group received DTZ 10 mg/kg twice daily for 5 doses or saline followed by a treadmill exercise protocol for 7 min with speed set at 7 m/min at 3% grade. The 3rd group received saline but no exercise. Results. Exercise increased SBP from 108 +/- 2 to 131 +/- 3 mmHg, and HR from 437 +/- 6 to 503 +/- 6 bpm, and plasma epinephrine concentrations from 2.0 +/- 0.6 to 5.8 +/- 1.7 ng/mL in control rats (p 0.05). Conclusion. Exercise hemodynamic and neurohormone responses are sensitive biomarkers which could be used for safety and efficacy evaluation of DTZ and perhaps also other calcium antagonists in pre-clinical animal models