U
Urban Westergren
Researcher at Royal Institute of Technology
Publications - 87
Citations - 1337
Urban Westergren is an academic researcher from Royal Institute of Technology. The author has contributed to research in topics: Extinction ratio & Modulation. The author has an hindex of 20, co-authored 82 publications receiving 1137 citations. Previous affiliations of Urban Westergren include Zhejiang University.
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Highly efficient nonuniform grating coupler for silicon-on-insulator nanophotonic circuits
TL;DR: The measured waveguide-to-fiber coupling efficiency of 64% (-1.9 dB) for the transverse electric polarization is achieved by the present nonuniform grating coupler directly defined on a regular silicon-on-insulator wafer.
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Segmented transmission-line electroabsorption modulators
TL;DR: In this article, a traveling-wave electroabsorption modulator (EAM) with a characteristic impedance close to 50 /spl Omega/ impedance and a very high bandwidth is presented.
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200 Gbps/Lane IM/DD Technologies for Short Reach Optical Interconnects
Xiaodan Pang,Weisheng Hu,Gunnar Jacobsen,Sergei Popov,Jiajia Chen,Oskars Ozolins,Rui Lin,Lu Zhang,Aleksejs Udalcovs,Lei Xue,Richard Schatz,Urban Westergren,Shilin Xiao +12 more
TL;DR: This article focuses on IM/DD transmissions, and provides an overview of recent research and development efforts on key enabling technologies for 200 Gbps per lane and beyond, and expects high-speed IM/ DD systems will remain advantageous in terms of system cost, power consumption, and footprint for short reach applications in the short- to mid- term perspective.
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50 Gb/s hybrid silicon traveling-wave electroabsorption modulator
TL;DR: A traveling-wave electroabsorption modulator based on the hybrid silicon platform that represents a significant improvement for modulators compatible with integration of silicon-based photonic integrated circuits is demonstrated.
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Monolithically Integrated 100 GHz DFB-TWEAM
TL;DR: In this article, a monolithically integrated distributed feedback (DFB) laser and traveling-wave electro-absorption modulator (TWEAM) with ges 100 GHz -3 dBe bandwidth suitable for Non-return-to-zero (NRZ) operation with on-off keying (OOK) is presented.