Abstract
Significant uncompensated reach extension of highly chirped 10-Gbit∕s directly
modulated lasers is demonstrated by use of optical filtering provided by optical
demultiplexers at the link end. Narrowband filtering narrows the optical spectrum of
the chirped signal to minimize dispersion effects when the filter's center
wavelength is appropriately adjusted relative to the laser wavelength. We show that
an equivalent reach improvement is obtained with a dense wavelength division
multiplexing (DWDM) demultiplexer as the filtering agent with optimal filter-laser
alignment. Experimental uncompensated reach lengths of greater than 100 km of
Corning LEAF® fiber are demonstrated, without the need for forward error correction.
This represents a reach improvement of up to 50% in comparison with nominally
unfiltered signal transmission. We also examine the correlation of performance with
the filter insertion loss derivative.
© 2005 Optical Society of America
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