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Coherent Nyquist UDWDM-PON with digital signal processing in real-time (Invited)

Ferreira, RMF ; Reis, J.D. ; Rossi, S. M. R. ; Amado, S. B. ; Shahpari, A. ; Guiomar, F. P. ; Oliveira, J. R. F. O. ; Pinto, A. N. ; Teixeira, A.

IEEE/OSA Journal of Lightwave Technology Vol. 34, Nº 2, pp. 826 - 833, January, 2016.

ISSN (print): 0733-8724
ISSN (online): 0733-8724

Journal Impact Factor: 2,567 (in 2015)

Digital Object Identifier: 10.1109/JLT.2015.2493207

Nyquist shaping UDWDM-PON combined with digital coherent optical systems has been recently proposed as a promising technology for future optical access networks. In this paper, we report real-time transmitter and receiver for a future coherent PON with high spectral efficiency and low-cost DSP implementation. Using FPGA-based 8-bit DSP, we experimentally demonstrate a high performance system based on 16×2.5 Gb/s QPSK signals in terms of receiver sensitivity and
fiber transmission. An optimal transmitted power of -7 dBm per channel is achieved for 50 km standard single-mode fiber in a 2.5 GHz grid. The experimental results show the feasibility of
coherent PON scenarios based on DSP supported by FPGAs.