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Phase-transparent amplification of 16 QAM signals in a QD-SOA

: Lange, S.; Contestabile, G.; Yoshida, Y.; Kitayama, K.-I.


IEEE Photonics Technology Letters 25 (2013), No.24, pp.2486-2489
ISSN: 1041-1135
Journal Article
Fraunhofer HHI ()

We study the nonlinear phase distortions in a columnar quantum dot semiconductor optical amplifier (QD-SOA) for coherent 16 quadrature amplitude modulation (QAM) signals. A few ps gain recovery in the QD-SOA enables suppression of the pattern dependent phase noise, which is a major performance limiting issue in conventional SOAs. A 25 dB phase and intensity transparent amplification of 40 Gb/s 16 QAM signals is experimentally demonstrated by error vector magnitude measurement.