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Dynamic characteristics of 20‐layer stacked QD‐SOA with strain compensation technique by ultrafast signals using optical frequency comb (Phys. Status Solidi A 3∕2017)
Author(s) -
Matsumoto Atsushi,
Akahane Kouich,
Sakamoto Takahide,
Umezawa Toshimasa,
Kanno Atsushi,
Yamamoto Naokatsu
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201770114
Subject(s) - ultrashort pulse , materials science , optical amplifier , optoelectronics , oscilloscope , optics , compensation (psychology) , physics , laser , psychology , detector , psychoanalysis
Here, Matsumoto et al. (Article No. 1600557 ) have evaluated the static and dynamic characteristics of the 20‐layer stacked quantum dot semiconductor optical amplifiers (QD‐SOAs), grown on an InP(311)B substrate with a strain compensation technique by ultrafast signals using an optical frequency comb. The gain peak wavelength of the fabricated QD‐SOA was 1520 nm, and a maximum gain of approximately 15.8 dB was obtained when the injection current was 350 mA. The dynamic behavior of the QD‐SOA with the pulse trains, whose minimum pulse interval was 4.2 ps, was observed by an optical sampling oscilloscope. It was found that the QD‐SOA could respond to ultrafast pulses that were equivalent to the signals of 220 Gb/s class speed, without any large pattern distortions. Furthermore, the gain recovery time of the QD‐SOA was estimated to be 6.0 ps by using a pump probe‐like method. One of the reasons that the fabricated QD‐SOA could respond to ultrafast signals was its ultrashort gain recovery time.