Abstract
This paper proposes a wavelength-division-multiplexing passive optical
network architecture with colorless user terminals based on the use of a different
modulation scheme for each way of communication. Narrow-frequency-shift keying
(FSK) modulation obtained by direct modulation of a distributed feedback laser
has been used for the downstream channel, and intensity modulation has been
used for the upstream channel. The performance of a link based on this scheme
has been assessed, with particular emphasis on the description of the narrow-FSK
modulation technique and its range of applicability in terms of bit rates
and power levels. The operation of the architecture is demonstrated by simultaneously
transmitting Ethernet frames at 1.25 Gb/s (gigabit Ethernet) in both the upstream
and downstream channels. Error rates for downstream and upstream channels
show excellent performance for distances up to 50 km.
© 2008 IEEE
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