Abstract
We report a two-span, 67-km space-division-multiplexed (SDM) wavelength-division-multiplexed (WDM)
system incorporating the first reconfigurable optical add–drop multiplexer (ROADM) supporting spatial
superchannels and the first cladding-pumped multicore erbium-doped fiber amplifier directly spliced to multicore
transmission fiber. The ROADM subsystem utilizes two conventional 1 × 20 wavelength selective switches (WSS)
each configured to implement a 7 × (1 × 2) WSS. ROADM performance tests indicate that the subchannel
insertion losses, attenuation accuracies, and passband widths are well matched to each other and show no significant
penalty, compared to the conventional operating mode for the WSS. For 6 × 40 × 128-Gb/s SDM-WDM
polarization-multiplexed quadrature phase-shift-keyed (PM-QPSK) transmission on 50 GHz spacing, optical
signal-to-noise ratio penalties are less than 1.6 dB in Add, Drop, and Express paths. In addition, we demonstrate
the feasibility of utilizing joint signal processing of subchannels in this two-span, ROADM system.
© 2013 IEEE
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