Highly Sensitive Photodetector Using Ultra-High-Density 1.5-μm Quantum Dots for Advanced Optical Fiber Communications

Toshimasa Umezawa; Kouichi Akahane; Naokatsu Yamamoto; Atsushi Kanno; Tetsuya Kawanishi

doi:10.1109/JSTQE.2014.2321288

Highly Sensitive Photodetector Using Ultra-High-Density 1.5-μm Quantum Dots for Advanced Optical Fiber Communications

Toshimasa Umezawa, Kouichi Akahane, Naokatsu Yamamoto, Atsushi Kanno, Tetsuya Kawanishi

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

We have fabricated a high-density 1.5-μm quantum dot photodetector for advanced optical fiber communications and have found unique optical properties, including avalanche multiplication. The structure of the absorption layer had stacked InAs/InGaAlAs layers with a high density of 1 × 10¹² cm^-2, which consisted of strained 1.5-μm InAs quantum dots and a strain compensation layer of InGaAlAs. A three times larger absorption coefficient than the InGaAs layer, an avalanche multiplication effect, and a low dark current are reported with InAs quantum dot conditions.

Original language	English
Article number	6808407
Journal	IEEE Journal on Selected Topics in Quantum Electronics
Volume	20
Issue number	6
DOIs	https://doi.org/10.1109/JSTQE.2014.2321288
Publication status	Published - 2014 Nov 1
Externally published	Yes

Keywords

Avalanche photodiodes
optical fiber communications
photodetectors
quantum dots (QDs)

ASJC Scopus subject areas

Electrical and Electronic Engineering
Atomic and Molecular Physics, and Optics

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Highly Sensitive Photodetector Using Ultra-High-Density 1.5-μm Quantum Dots for Advanced Optical Fiber Communications. / Umezawa, Toshimasa; Akahane, Kouichi; Yamamoto, Naokatsu; Kanno, Atsushi; Kawanishi, Tetsuya.

In: IEEE Journal on Selected Topics in Quantum Electronics, Vol. 20, No. 6, 6808407, 01.11.2014.

Research output: Contribution to journal › Article › peer-review

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