| 1. |
- Eriksson, Klas, 1983, et al.
(author)
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InP DHBT Distributed Amplifiers With Up to 235-GHz Bandwidth
- 2015
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In: IEEE Transactions on Microwave Theory and Techniques. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9480 .- 1557-9670. ; 63:4, s. 1334-1341
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Journal article (peer-reviewed)abstract
- Three wideband amplifiers in double-heterojunction bipolar transistor technology have been designed and measured. The amplifiers use different types of distributed amplifier (DA) topologies, all based on cascode gain cells. A single-stage DA design achieves 7.5-dB gain and 192-GHz bandwidth and a two-cascaded single-stage DA achieves an average gain of 16 dB with a bandwidth of 235 GHz. The third circuit is a conventional DA with more than 10-dB gain from 70 kHz up to 180 GHz. To the authors' best knowledge, the single-stage DA and the two-cascaded single-stage DA are the widest band amplifiers in any technology reported to date. Furthermore, the conventional DA has a record bandwidth for circuits in conventional DA topology with gain from near dc.
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| 2. |
- Nopchinda, Dhecha, 1991, et al.
(author)
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Dual Polarization Coherent Optical Spectrally Efficient Frequency Division Multiplexing
- 2015
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In: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 28:1, s. 83-86
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Journal article (peer-reviewed)abstract
- A new optical spectrally efficient frequency division multiplexing technique, utilizing coherent detection and polarization division multiplexing, is proposed and demonstrated. The proposed system uses non-orthogonal and overlapping subcarriers to provide a significant reduction in both the electrical and optical bandwidth of up to 33%, relative to dual polarization orthogonal frequency division multiplexing (DP-OFDM), with an implementation penalty
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