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Terahertz (THz) direct detectors based on superconducting niobium nitride (NbN) hot electron bolometers (HEBs) with microwave (MW) injection have been studied. Compared to the thermal biasing method, the injected MW is used here to bias the HEB to the optimum point. MW can be expected to be used as the easy read out for the detecting array. The used NbN HEB has an excellent performance as heterodyne...
Advances in technology for optical arbitrary waveform generation will be described. Combs spanning two octaves, from 500nm to 2µm, based on GHz modelocked Ti:sapphire and erbium-fiber lasers, have been carrier-envelope stabilized and frequency referenced.
The FM amplitude/phase responses of InP-based VCSELs at 1.5µm, 1.8µm and 2.3µm are presented and compared. The plasma effect is clearly observed although at 2.3µm it is significantly lower. This interesting result is discussed.
Based on Nb5N6 thin film, whose temperature coefficient of resistance is as high as -0.7% /K at room temperature, bolometer integrated with a planar bow-tie antenna has been designed and fabricated for detecting THz signal without the need to cool the bolometer itself. The best attainable electrical responsivity of the bolometer is about -400 V/W at a current bias of 0.4 mA. The electrical NEP is...
A coherent receiver with feedback was developed to linearly demodulate the phase of an analog signal. The receiver demonstrates a spur-free dynamic range of 125 dBmiddotPHz2/3 at a signal frequency of 300 MHz.
A simple theoretical model is used to derive closed form expressions for the FM response of VCSELs. These match measurement results very well and give a significant improvement over the usually assumed first order model.
This work experimentally demonstrates optical vector signal generation using frequency multiplication based on double sideband with carrier suppression. After transmission over 50-km SMF, the power penalty of 15-GHz 1.25-Gb/s RF signals is less than 0.2-dB.
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