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For all high-performance detectors, well-understood optical test systems are needed for precise characterisation and calibration. A cryogenic variable temperature blackbody load has been developed to test the optical efficiencies of ultra-low-noise (NEP ∼ 10−19 WHz−1/2) Transition Edge Sensors for space science. The few-mode, partially coherent illumination conditions of the measurement system are...
We show that with simple spectral filtering, the Schmidt number for the transmitted photon-pairs (with 90% transmittance) which are produced via type-II parametric down-conversion in a KTP waveguide equals to unity to within 0.2%.
Hybrid access network integrated with multi-level wireless vector signal and wireline OOK signal without optical filter is proposed for the first time. 312.5-MSymbol/sec RF 8-PSK signal and 1.25-Gb/sec BB signal are experimentally demonstrated.
This study demonstrates a novel filterless frequency quadrupling technique for optical millimeter-wave generation and WDM up-conversion. After transmission of 50-km SMFF, the sensitivity penalty of each channel is less than 1.5 dB.
The generation of optical millimeter-wave with frequency 8-tupling is experimentally demonstrated. 625-Mb/sec QPSK data transmission at 105-GHz (W-band) is achieved for the first time using the millimeter-wave generation technique and direct modulation of a NBUTC-PD.
A tunable photonic microwave filter using slow light in a VCSEL is proposed and experimentally demonstrated for the first time. Tunable microwave notch filter at 20 GHz can be achieved by adjusting the bias current of VCSEL.
A novel 60-GHz photonic millimeter-wave signal generation using a frequency quadrupling technique is proposed for the first time. A 312.5-MSym/s 8-QAM millimeter-wave signal at 60 GHz is demonstrated with negligible penalty following 25-km SMF transmission.
A novel all optical WDM up-conversion system using frequency quadruple technique is proposed. The proposed system can be utilized in the future 60-GHz band WiMAX RoF system.
This investigation experimentally demonstrates tunable slow light in a semiconductor optical amplifier (SOA) without an external pump laser. Tunable time delays are achieved by adjusting the feedback signal from the SOA.
A multi-services hybrid access network has been experimentally demonstrated. The scheme has no RF fading issue; can carry vector signals, and requires no optical filter at remote nodes.
This work demonstrates a novel mm-wave generation using a frequency quadrupling technique. Only one external MZM is used and no optical filter is needed. It provides a simple and inexpensive choice for WDM RoF applications.
The paper presents the design and experimentation of a high-performance optical packet-switched metro WDM ring network (HOPSMAN). Equipped with novel medium access control, HOPSMAN achieves superior bandwidth efficiency, access delay, fairness, and bursty traffic adaptation.
Two-stage double-pass EDFA with a broadband flat gain is constructed in a hermetically sealed package. The EDFA has a low noise-figure of 4 dB, a high output power exceeding 15 dBm and a /spl plusmn/0.2 dB gain flatness over a 30 nm bandwidth.
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