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Pump-Linewidth-Tolerant Optical Data Exchange between 16QAM and QPSK with 50-GHz Channel-Spacing using Coherent DFB Pump

Lu, G.-W. ; Albuquerque, A. ; Puttnam, B. J. ; Sakamoto, T. ; Drummond, M. V. ; Nogueira, R.N. ; Kanno, A. ; Shinada, S. ; Wada, N. ; Kawanishi, T.

Pump-Linewidth-Tolerant Optical Data Exchange between 16QAM and QPSK with 50-GHz Channel-Spacing using Coherent DFB Pump, Proc European Conf. on Optical Communications - ECOC, Cannes, France, Vol. 40, pp. P.2.18 - P.2.18, September, 2014.

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Abstract
We propose and experimentally demonstrate optical data exchange scheme between16QAM and QPSK with narrow spacing of 50GHz. The use of coherent pump makes it free of phase noise from pumps, and enables the use of low-cost DFB as pump source.