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Summary: 228 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 28, NO. 2, JANUARY 15, 2010
Design of WDM PON With Tunable Lasers:
The Upstream Scenario
Jingjing Zhang, Student Member, IEEE, and Nirwan Ansari, Fellow, IEEE
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-gen-
eration 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
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