Abstract
Tunable lasers are potential upstream optical light generators for
wavelength-division-multiplexing (WDM) passive optical network (PON), which
is a promising solution for next-generation broad-band optical access. The
wavelength provisioning flexibility of tunable lasers can increase the
admissible traffic in the network as compared to wavelength-specific lasers.
Generally, the broader the lasers' tuning ranges, the more the traffic can
be admitted to the network. However, broad tuning range requires
sophisticated technology, and probably high cost. To achieve the optimal
tradeoff between the admissible traffic and the cost, we investigate the
relationship between lasers' tuning ranges and the network's admissible
traffic and then design WDM PON by selecting lasers with proper tuning
ranges for the upstream data transmission. Specifically, we focus on
addressing two issues under three scenarios. The two issues are: how to
admit the largest traffic by properly selecting lasers, and how to admit
given upstream traffic using lasers with tuning ranges as narrow as
possible. The three scenarios are: full-range tunable and
wavelength-specific lasers are available, limited-range tunable lasers are
available, and the exact number of lasers with specific tuning ranges are
given.
© 2010 IEEE
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