Title :
Digital PLL based frequency offset compensation and carrier phase estimation for 16-QAM coherent optical communication systems
Author :
Chongjin Xie ; Raybon, G.
Author_Institution :
Bell Labs., Alcatel Lucent, Holmdel, NJ, USA
Abstract :
We modify a 2nd-order digital phase-locked loop (PLL) with additional frequency-offset compensation and pilot-symbol aided cycle slip recovery modules, and show that the modified 2nd-order PLL can successfully recover the carrier phase for a 16-QAM coherent detection system with a frequency offset up to 10% of the symbol rate.
Keywords :
channel spacing; optical communication equipment; optical fibre communication; phase locked loops; quadrature amplitude modulation; 16-QAM coherent optical communication; carrier phase estimation; coherent detection system; digital PLL; frequency offset compensation; pilot symbol aided cycle slip recovery module; second order digital phase locked; Bit error rate; Frequency estimation; Lasers; Optical noise; Phase locked loops; Signal to noise ratio; Transmitters;
Conference_Titel :
Optical Communications (ECOC), 2012 38th European Conference and Exhibition on
Conference_Location :
Amsterdam
