Abstract
We measure spectral efficiencies of ultra-dense (UD) wavelength-division
multiplexing (WDM) channels for metro applications. We change the channel
spacing in 500-MHz step using a beat-frequency-locking method. Applying both
a polarization control (PC) and a forward-error correction (FEC), we achieve
spectral efficiencies as high as 1.54 and 0.91 b/s/Hz in back-to-back
operations for channel-interleaved (CI) bidirectional and unidirectional
UD-WDM, respectively. If we use the PC and the FEC separately for the
CI-bidirectional UD-WDM, the PC enhances the spectral efficiency over the
FEC by 4.6%–21.2% as the transmission distance is increased.
© 2011 IEEE
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