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Performance comparison of different 8QAM constellations for the use in flexible optical networks

: Nölle, M.; Frey, F.; Elschner, R.; Schmidt-Langhorst, C.; Napoli, A.; Schubert, C.


Optical Society of America -OSA-, Washington/D.C.; Institute of Electrical and Electronics Engineers -IEEE-:
Optical Fiber Communications Conference and Exhibition, OFC 2014. Vol.3 : San Francisco, California, USA, 9 - 13 March 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-5731-6
ISBN: 978-1-55752-993-0
ISBN: 978-1-55752-994-7
Optical Fiber Communications Conference and Exhibition (OFC) <2014, San Francisco/Calif.>
Conference Paper
Fraunhofer HHI ()

We investigate the influence of DAC resolution and pulse shaping on the system performance of different 8QAM constellations. Furthermore, we experimentally show that a circular constellation outperforms the commonly used 8QAM constellation by 0.7 dB in terms of OSNR sensitivity at a BER of 3.8·10-3.