Abstract
We describe a new multicore fiber (MCF) having seven single-mode cores
arranged in a hexagonal array, exhibiting low crosstalk among them and low
loss across the C- and L-band. In order to spatially multiplex
and demultiplex optical signals in and out of the MCF, we designed and
fabricated a tapered MCF connector (TMC) with ultralow crosstalk and loss
for space-division-multiplexing (SDM) transmission. The key crosstalk
properties of MCF, including wavelength and distance dependence crosstalk
characteristics, and statistical distribution of crosstalk over time, are
measured and discussed. Using the MCF and TMC, we experimentally demonstrate
a record transmission capacity of 112 Tb/s over a 76.8 km MCF using SDM and
dense wavelength division multiplexing. Each core of the MCF carries 160 107
Gb/s polarization-division multiplexed quadrature phase-shift keying
(PDM-QPSK) channels on a 50 GHz grid in the C- and L-band,
resulting in an aggregate spectral efficiency of 14 b/s/Hz. The system
impact of the intercore crosstalk on a 107 Gb/s PDM-QPSK signal is further
investigated by transmitting it through the center core while the six outer
cores carry same-wavelength 107 Gb/s signals. The system implication of the
core-to-core crosstalk on ultralong-haul transmission is also
discussed.
© 2011 IEEE
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