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Chung, Il-Sug
Nano-Optoelectronics Lab.
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Ultrahigh-speed Si-integrated on-chip laser with tailored dynamic characteristics

Author(s)
Park, Gyeong CheolXue, WeiqiPiels, MollyZibar, DarkoMork, JesperSemenova, ElizavetaChung, Il-Sug
Issued Date
2016-12
DOI
10.1038/srep38801
URI
https://scholarworks.unist.ac.kr/handle/201301/23708
Fulltext
https://www.nature.com/articles/srep38801
Citation
SCIENTIFIC REPORTS, v.6, pp.38801
Abstract
For on-chip interconnects, an ideal light source should have an ultralow energy consumption per bandwidth (operating en-ergy) as well as sufficient output power for error-free detection. Nanocavity lasers have been considered the most ideal for smaller operating energy. However, they have a challenge in obtaining a sufficient output power. Here, as an alternative, we propose an ultrahigh-speed microcavity laser structure, based on a vertical cavity with a high-contrast grating (HCG) mirror for transverse magnetic (TM) polarisation. By using the TM HCG, a very small mode volume and an un-pumped compact optical feedback structure can be realised, which together tailor the frequency response function for achieving a very high speed at low injection currents. Furthermore, light can be emitted laterally into a Si waveguide. From an 1.54-mu m optically-pumped laser, a 3-dB frequency of 27 GHz was obtained at a pumping level corresponding to sub-mA. Using measured 3-dB frequen-cies and calculated equivalent currents, the modulation current efficiency factor (MCEF) is estimated to be 42.1 GHz/mA1/2, which is superior among microcavity lasers. This shows a high potential for a very high speed at low injection currents or avery small heat generation at high bitrates, which are highly desirable for both on-chip and off-chip applications.
Publisher
NATURE PUBLISHING GROUP
ISSN
2045-2322

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