Title :
Joint-Polarization and Joint-Subchannel Carrier Phase Estimation for 16-QAM Optical Systems
Author :
Souto, Diego Vieira ; Olsson, Bengt-Erik ; Larsson, Christina ; Mello, Darli A A
Author_Institution :
Dept. of Electr. Eng., Univ. of Brasilia, Brasília, Brazil
Abstract :
Carrier phase estimation using information from multiple subchannels and orthogonal polarization channels is proposed and experimentally verified. The concept is evaluated with a 112 Gb/s dual-channel DP-16-QAM system, but may find applications in next generation Terabit systems utilizing superchannels and containing densely packed subchannels originating from the same laser. The new technique requires an accurate carrier frequency estimation algorithm, implemented in the paper using a decision-directed method. The algorithms are tested with a narrow (100 kHz) and a broad (2 MHz) linewidth laser in the coherent receiver.
Keywords :
channel estimation; frequency estimation; lasers; optical communication; phase estimation; quadrature amplitude modulation; broad linewidth laser; carrier frequency estimation algorithm; coherent receiver; decision-directed method; densely packed subchannels; dual-channel DP-16-QAM optical system; joint-polarization; joint-subchannel carrier phase estimation; narrow linewidth laser; next generation terabit systems; optical communication; orthogonal polarization channels; superchannels; Equalizers; Estimation; Frequency estimation; Optical polarization; Phase estimation; Phase noise; Signal processing algorithms; Carrier phase estimation; multichannel system; optical communications;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2012.2216255
