On the impact of carrier phase estimation on phase correlations in coherent fiber transmission
Paper i proceeding, 2015

Carrier phase estimation (CPE) is an integral part of the digital signal processing (DSP) of coherent optical communication systems as it compensates laser phase noise (LPN) introduced by free-running transmitter and local oscillating (LO) lasers. Nonlinear interactions during propagation are another source of correlated phase noise. In this paper, we show through simulations and in experiments that blind decision-directed (DD) CPE with regular block lengths removes a large portion of the memory. This makes it virtually impossible in practice to quantify correlations that come from propagation effects, or to obtain rate gains by exploiting the nonlinear phase noise (NLPN). Larger CPE block lengths leave the memory partly intact. This, however, comes at the expense of reduced information rates. We are able to fully recover this rate loss in simulations by using idealized processing of phase distortions. In experiments with full DSP, an almost full rate recovery is reported.

Författare

Tobias Fehenberger

Technische Universität München

Norbert Hanik

Technische Universität München

Tobias Eriksson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Pontus Johannisson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Magnus Karlsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

2015 Tyrrhenian International Workshop on Digital Communications, TIWDC 2015

35-38

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1109/TIWDC.2015.7323331

ISBN

978-1-4673-9260-0

Mer information

Senast uppdaterat

2018-03-16