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The reduction of detectors in PET systems, without significantly compromising the PET utility, is an important cost consideration in a PET-system design. Recent advances in algorithm development can be used for enabling the design and assessment of innovative PET systems. In this work, we investigate PET configurations with reduced number of detectors by using the ASD-POCS algorithm that was developed...
A photonic scheme to act as microwave digital synthesizer based on a tunable polarization diversified comb filter and the process of frequency-to-time-mapping is proposed and experimentally demonstrated. 2-ASK/PSK/FSK signals are generated with tunabilities in the bit-rate, duty-cycle and carrier frequencies.
A photonic-assisted microwave phase shifter using phase modulator and fiber-Bragg-grating in a round trip configuration is proposed. The phase of 20∼30 GHz microwave signals can be shifted by properly adjusting the voltage of PM-driving signal.
A novel approach to generate tunable microwave photonic pulse shaping based on modified incoherent frequency-to-time mapping (FTTM) is proposed. By adjusting the product of the bit-rate and the pulsewidth (i.e. BΔT) to introduce the intersymbol interference, we demonstrate the effectiveness of our approach by generating typical UWB and triangular pulses.
Multiform spectral shaping schemes to provide tunability on the shape, free spectral range and bandwidth of microwave photonic signals are reviewed. By utilizing specific dispersion-based conversion techniques, the proposed scheme scan be widely used to achieve flexible manipulation of microwave signals.
This paper focuses on a basic research of out-of-phase synchronization currents of a single phase transformer and its impact on a system of synchronous machine, transformer, switch and grid. The effect of transformer saturation is studied for different switching conditions using the finite element software FLUX 3D. The position of the switch has a significant influence on the peak current. The studied...
We describe recent experimental progress with the JILA Sr optical frequency standard, which has a systematic uncertainty at the 10−16 fractional frequency level, currently limited by frequency shifts due to atomic interactions and room temperature blackbody radiation (BBR). We will discuss systematic measurements of collisional shifts and provide a complete theory to understand these interaction effects...
Manipulation of optical signals with tunablity and reconfigurability is essential for high-speed systems or networks. We review tunable photonic microwave signal generation and filtering, followed by all-optical signal processing in polarization-division-multiplexed systems.
Advances in ultra-stable lasers now permit sub-Hz resolution of optical atomic transitions. At this level, weak interactions by any ordinary scale can in fact dominate the dynamics of the interrogated atoms, even for spin polarized fermions at ultralow temperatures. Contrary to results obtained in radio frequency spectroscopy of alkali fermionic atoms, optical spectroscopy of 87 Sr and 171 Yb has...
An all-optical multi-level RZ-to-NRZ format converter for two tributaries of a PDM signal is proposed using a polarization-maintaining-fiber inside a polarization-diversified-loop. A three-level format conversion in a 2×15.85-Gbit/s PDM system is experimentally demonstrated.
All-optical RZ to NRZ format conversion for two tributaries of a PDM signals simultaneously is demonstrated through a single highly nonlinear fiber with polarization nonlinear loop mirror configuration. Less than 1-dB power penalty is achieved.
Silicon represents a mature, affordable platform for fabricating electronic and optical signal processing devices. We discuss all-optical 170 Gbit/s switching, a 42 Gbit/s electro-optic modulator, and proof-of-concept results for a surface plasmon polariton absorption modulator.
We report successful reception of dual-LP11-mode CO-OFDM signals traversing few-mode compatible optical add/drop multiplexer (OADM). The power penalties for add, drop and through ports are 2.6, 2.4, 0.7 dB, respectively for 3×318 Gb/s OFDM signals.
We have proposed a fiber-optic spectrum shaper that can generate optical spectrum with variable shapes. The simulation results verified the diversity of the output optical spectrum and the experimental results are shown to demonstrate the effectiveness of this spectrum shaper.
We present an OPO frequency comb spectrometer accessing the 2200–3700-cm−1 spectral range. The system allows rapid, high-resolution molecular fingerprinting for trace gas detection. Permitting further wavelength extension, recent development of a 2-μm comb is demonstrated.
This work presents a nanoplasmonic photoconductive antenna (NP-PCA) for high power terahertz emission. Plasmonically matched metal nanostructures are integrated on a photoconductive bow-tie type THz antenna by incorporating microfabrication and electron-beam lithography. The plasmonic resonance wavelength of metal nanostructure is matched with the optical wavelength of incident pulsed beam. Metal...
Devices and concepts based on nanoplasmonics have seen tremendous developments during recent years. On the one hand, nanophotonic waveguides based on surface plasmons have been shown to exhibit deep-subwavelength guiding properties, and on the other hand plasmonic nanostructures have been optimized for local sensing applications, such as surface enhanced Raman scattering (SERS). In both application...
A synthesis scheme to generate microwave triangular-shaped pulses based on spectral shaping and frequency-to-time mapping is proposed. Triangular-shaped signals with periods of 0.2ns, 0.4ns, 1.6ns and pulse widths of 0.13ns, 0.35ns are demonstrated.
PMD mitigation in 2×10-Gb/s RZ-OOK PDM systems is demonstrated through a single all-optical-regenerator with polarization-diversified loop configuration. 3.0-dB eye-diagram-based SNR improvement is achieved in the presence of 6.3-ps DGD for RZ signals with 18-ps pulsewidth.
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