Abstract
The feasibility of a 40 Gbit/s wavelength
division multiplexed system using a power unbalanced polarization division
multiplexing (PUPDM) scheme has been explored for metropolitan distances using
the standard single mode fiber and erbium doped fiber amplifiers. PUPDM is
a quaternary communication scheme in which two subchannels, each carrying 20 Gbit/s information data, are combined on the same wavelength
to effectively communicate 40 Gbits/s using
only binary transmitters and binary receivers. PUPDM not only reduces the
cost of the optics and electronics in metropolitan networks but also reduces
the degrading effect of polarization mode dispersion (PMD) by actually transmitting
at half of the effective data rate. The effects of fiber nonlinearity and
PMD are extensively analyzed for each of two 20 Gbit/s subchannels
for an aggregate 40 Gbit/s capacity
per wavelength channel. The analysis suggests that a 40 Gbit/s PUPDM
system with 50 GHz channel spacing is feasible for up to 600 km of
transmission distance on single mode fiber, using 7% Reed-Solomon forward
error correction and 20 Gbit/s electronics.
© 2006 Optical Society of America
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