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Proceedings Paper

A new electro-absorption modulator structure based on Ge/SiGe coupled quantum wells for on-chip optical interconnects
Author(s): Yusi Chen; Xiaochi Chen; Yijie Huo; Ching-Ying Lu; Edward T. Fei; Kai Zang; Colleen Shang; Yangsen Kang; Jieyang Jia; Theodore I. Kamins; James S. Harris
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Paper Abstract

In this paper, a novel electro-absorption modulation mechanism based on coupled-quantum-wells (CQWs) is proposed and demonstrated. Compared to a quantum-confined-stark-effect (QCSE) modulator with multiple fully decoupled single-QWs, the newly designed CQW modulator has two sub-quantum-wells partially coupled with a small barrier in between. Modulation is based on the change of electron and hole wave-function overlap in the CQWs, which requires a small bias electric field of <10 kV/cm) compared to the operation of a typical QCSE modulator which requires >50 kV/cm bias electrical field. Theoretically, the power consumption of this new CQW modulator can be lower than 20 fJ/bit and the speed can be higher than 10 Gbps, which outperforms the best Ge/SiGe QCSE modulator that has been previously demonstrated. A proof-of-concept Ge/SiGe CQW modulator based on this novel modulation mechanism was designed and fabricated. Instead of a traditional PIN diode structure, the new CQW modulator uses a PIP structure.

Paper Details

Date Published: 13 November 2014
PDF: 6 pages
Proc. SPIE 9277, Nanophotonics and Micro/Nano Optics II, 92770Y (13 November 2014); doi: 10.1117/12.2071673
Show Author Affiliations
Yusi Chen, Stanford Univ. (United States)
Xiaochi Chen, Stanford Univ. (United States)
Yijie Huo, Stanford Univ. (United States)
Ching-Ying Lu, Stanford Univ. (United States)
Edward T. Fei, Stanford Univ. (United States)
Kai Zang, Stanford Univ. (United States)
Colleen Shang, Stanford Univ. (United States)
Yangsen Kang, Stanford Univ. (United States)
Jieyang Jia, Stanford Univ. (United States)
Theodore I. Kamins, Stanford Univ. (United States)
James S. Harris, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 9277:
Nanophotonics and Micro/Nano Optics II
Zhiping Zhou; Kazumi Wada, Editor(s)

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