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25 Gbit/s differential phase-shift-keying signal generation using directly modulated quantum-dot semiconductor optical amplifiers

 
: Zeghuzi, A.; Schmeckebier, H.; Stubenrauch, M.; Meuer, C.; Schubert, C.; Bunge, C.-A.; Bimberg, D.

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Applied Physics Letters 106 (2015), No.21, Art. 213501
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
English
Journal Article
Fraunhofer HHI ()

Abstract
Error-free generation of 25-Gbit/s differential phase-shift keying (DPSK) signals via direct modulation of InAs quantum-dot (QD) based semiconductor optical amplifiers (SOAs) is experimentally demonstrated with an input power level of −5 dBm. The QD SOAs emit in the 1.3-μm wavelength range and provide a small-signal fiber-to-fiber gain of 8 dB. Furthermore, error-free DPSK modulation is achieved for constant optical input power levels from 3 dBm down to only −11 dBm for a bit rate of 20 Gbit/s. Direct phase modulation of QD SOAs via current changes is thus demonstrated to be much faster than direct gain modulation.

: http://publica.fraunhofer.de/documents/N-352119.html