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the entire WDM band should be backward propagated using
(7). In [13], nonlinear compensation for different intrachannel
and interchannel effects is discussed with various channel
granularities. XPM compensation significantly improves
system performance, especially the fine granularity. The
coherent nature of FWM requires the phase-locked LOs to
preserve the relative phase between channels [13], [32].
The disadvantage of BP is that it needs the information of
both the fiber link and signals of the neighboring channels.
Therefore, multichannel signals must be obtained in the
coherent receiver, which makes the system design more
complex. As a consequence, BP is only effective in
point-to-point fiber links in which all WDM channels share the
same TX-RX locations [13]. For optical networks with
add/drop multiplexers and signals that are routed differently,
interchannel nonlinear compensation is ineffective for BP.
Further study is required into blind equalization of
interchannel nonlinear distortions using some kind of
electrical equalization structure.
Acknowledgement
This work was supported by National Natural Science
Foundation of China (No. 61077053, 60932004, and
60877045) and National Basic Research Program of China
(No. 2010CB328201).
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Manuscript received: December 4, 2011
B
iography
S pecial Topic
Fan Zhang (fzhang@pku.edu.cn) received his PhD degree in electromagnetic
fields and microwave technology from Beijing University of Posts and
Telecommunications in 2002. From 2002 to 2004, he was a senior research
associate at City University, Hong Kong. From 2004 to 2006, he was a
Humboldt Research Fellow at Fachgebiet Hochfrequenztechnik, Technische
Universität, Berlin. Since May 2006, he has been an associate professor at the
School of Electronics Engineering and Computer Science, Peking University.
His current research interests include long-haul optical transmission and
photonic networking technologies, especially coherent optical communication
and digital signal processing. He has published more than sixty academic
articles in peer-reviewed international journals. Dr. Zhang is a senior member
of IEEE and a member of the Optical Society of America.
March 2012 Vol.10 No.1 ZTE COMMUNICATIONS 49