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Your search keyword '"Roberts, J.S."' showing total 162 results
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162 results on '"Roberts, J.S."'

15. Surface emission from MBE and MOVPE grown quantum cascade lasers

Author

Schrenk, W., primary, Pflugl, C., additional, Austerer, M., additional, Golka, S., additional, Strasser, G., additional, Green, R.P., additional, Wilson, L.R., additional, Revin, D.G., additional, Zibik, E.A., additional, Cockburn, J.W., additional, Tey, C.M., additional, Krysa, A.B., additional, Roberts, J.S., additional, and Cullis, A.G., additional

Published
2005
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17. MOVPE grown quantum cascade lasers: single mode performance and structural quality

Author

Green, R.P., primary, Wilson, L.R., additional, Revin, D.G., additional, Zibik, E.A., additional, Cockburn, J.W., additional, Krysa, A.B., additional, Tey, C.M., additional, Roberts, J.S., additional, Cullis, A.G., additional, Pflugl, C., additional, Schrenk, W., additional, Strasser, G., additional, Offermans, P., additional, Koenraad, P.M., additional, and Wolter, J.H., additional

Published
2005
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44. IEEE 802.11a Data Over Fiber Transmission Using Electromagnetic Bandgap Photonic Antenna With Integrated Asymmetric Fabry–PÉrot Modulator/Detector.

Author

Chin-Hsiu Chuang, Chin-Pang Liu, Ismail, T., Xiaojing Wang, Yang Hao, Parini, C., Huggard, P.G., Krysa, A.B., Roberts, J.S., and Seeds, A.J.

Abstract

We report bidirectional link characterization and the first IEEE 802.11a wireless local area network (WLAN) data transmission using an electromagnetic bandgap (EBG) photonic antenna with an integrated InGaAs/AlInGaAs multiple quantum-well (MQW) asymmetric Fabry-Perot modulator/detector (AFPM). The dual-function AFPM performs as an optical intensity modulator on the uplink and as a conventional photodetector on the downlink in a single device. This new InGaAs/AlInGaAs AFPM device has also shown an improved modulation slope -dR/dV of 17%/V, where dR is the differential optical reflectance and dV is the differential terminal voltage, compared to the previously reported 6%/V achieved with an InGaAsP/InGaAsP MQW AFPM. Half-duplex IEEE 802.11a connection was successfully established between a laptop computer and the photonic antenna which in turn was connected via an optical fiber to a wireless access point. A maximum data throughput of 7 Mbps was achieved at 8-m separation between the laptop and the photonic antenna. [ABSTRACT FROM PUBLISHER]

Published
2008
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45. InP-GaInP quantum-dot lasers emitting between 690-750 nm.

Author

Smowton, P.M., Lutti, J., Lewis, G.M., Krysa, A.B., Roberts, J.S., and Houston, P.A.

Abstract

We describe the growth, material characterization, and device characterization of InP-GaInP quantum-dot lasers for operation in the wavelength range 690-750 nm. We show that the growth conditions have a major influence on the form of the gain spectrum. Relatively flat gain can be achieved over a spectral width of 90 nm at 300 K using samples containing a bimodal distribution of dot sizes, or narrower gain spectra at shorter wavelength can be achieved by suppressing the bimodal distribution by using (211)B substrates. Optimization of samples grown on substrates with the growth surface of (100) misorientated by 10° toward [111] results in laser operation between 729 and 741 nm and with a room temperature threshold current density as low as 190 A·cm-2 for a 2000-μm-long device with uncoated facets. [ABSTRACT FROM PUBLISHER]

Published
2005
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