title: Comment on "High Gain Submicrometer Optical Amplifier at Near-Infrared Communication Band".
authors.affiliation: Department of Electronic Engineering, Tsinghua University, Beijing, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Feng
authors.affiliation: School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: Zhicheng
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Jurgen
authors.initials: J
authors.lastname: Michel
authors.affiliation: Department of Electronic Engineering, Tsinghua University, Beijing, China.|School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: Cun-Zheng
authors.initials: CZ
authors.lastname: Ning
authors.affiliation: Department of Materials and Nano Physics, School of Information and Communication Technology, KTH-Royal Institute of Technology, Electrum 229, Isafjordsgatan 22-24, 16440 Kista, Sweden.
authors.forename: Markus
authors.initials: M
authors.lastname: Pollnau
authors.affiliation: Department of Optical Engineering, Zhejiang University, Hangzhou, China.
authors.forename: Limin
authors.initials: L
authors.lastname: Tong
authors.affiliation: School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: Leijun
authors.initials: L
authors.lastname: Yin