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The AC Quantum Voltmeter, which was a breakthrough as an accredited, industrial-tested, fast and easy-to-use DC and AC voltage quantum-based calibrating system, has now been taken one step further with new extensive capabilities covering resistance and current measurements. Using equipment readily available in calibration laboratories, the new Quantum Calibrator covers a wide range of resistance by...
This paper describes the properties of a 10 V programmable Josephson voltage standard (PJVS) array operated in a cryocooler. The operating margins at 70 GHz frequencies are discussed and compared to liquid helium cooling. A crucial factor is the limited heat conduction between PJVS chip and cold stage. A method is presented to estimate the heat conduction directly with the Josephson array. Finally,...
Existing instruments that assess the individual's relationship with technology tend to focus on negative constructs and assume that a high use of technology reflects pathology. Since technology use can be beneficial, there is a need for a more balanced instrument. An initial survey to assess the individual's relationship with their mobile phone was developed, checked for face validity and the resulting...
We investigate the strong light-matter interactions of intersubband resonances (ISRs) in a triangular quantum well to a THz metamaterial. The large tuning possibility of ISRs with a high quality epitaxial gate enables the device to be electrically driven in-and-out of the coupling regime.
This paper describes the performance of a new turn-key AC quantum voltmeter, an AC Josephson voltage standard system, used for calibration of common DC and AC voltage standards. The capabilities and handling of the system in an industrial environment were investigated and are discussed here. Several Fluke 5700A series calibrators were tested and their voltage and frequency dependence is characterized...
A Voltage Calibrator based on a 10-V programmable Josephson Array that is simple to use, provides DC and AC calibration up to kHz range for industry-common equipment, and ensures direct traceability to a quantum-based standard, is under development. This device has proven to excel conventional DC standard systems and will extend into low frequency AC range, thereby making itself a practical and robust...
Optical and wireless integration in the same platform is an essential requirement for future access networks in order to achieve an economically feasible business model, especially for the deployment of Next Generation Networks. The combination of both technologies offers high bandwidth together with mobility, thus making a strong contribution to future high capacity applications. PON (passive optical...
We present the first experimental demonstration of a bi-directional, reflective, electro-absorption transducer-based, 480 Mbps UWB-wireless/optical transmission system. A -21.4 dB error vector magnitude was observed over 1 km of single mode fibre.
Wireless and optical integration is pivotal to the exploitation of future access solutions. Optics provides greater bandwidths and long reach while wireless offers easier deployment, mobility and freedom to end users. By combining both, service experience is highly enhanced. Single types of transmission systems indeed have their advantages, but integration is essential if broadband really is for all...
Current TDM-PONs are unlikely to provide sufficient bandwidth for emerging high-quality video and multimedia applications. Consequently, topologies combining and overlaying TDM-PONs with WDM are currently being investigated. In this work, we present a seamless upgrade path from TDM-PONs to WDM-PONs; provision being made on an on-demand basis that is transparent to existing deployments. In these next-...
An advanced network topology based on a combination of WDM and TDMA on a hybrid ring-tree outside plant is presented and experimentally demonstrated. The topology offers resilience and dynamic bandwidth allocation capabilities.
Designs of low cost ONU for WDM-PON are presented and evaluated. Reflective-SOAs are proposed to be used as core of the ONU in a bidirectional single-fiber single-wavelength topology. FEC is employed to mitigate crosstalk effects
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