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.
© 2012 IEEE
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