A passive double star (PDS) network, which shares one optical fiber with multiple subscribers by using a power splitter,
is being deployed as an infrastructure for the passive optical network (PON) systems. One of the main focuses for PON
network planning is to determine the optical cable route of a point-to-multipoint network that connects every subscriber
to the central offices (COs) through the power splitter(s) within a limited deployment cost under realistic restrictions,
such as possible fiber paths, the splitting ratio of optical splitters and locations, when the locations of COs and
subscribers are given.
In this paper, we propose a novel suboptimal design algorithm for PON outside plant deployment. Under the realistic
restrictions, the algorithm can automatically generate a suboptimal PON network that connects every subscriber to the
COs in terms of total fiber length.
We have experimentally investigated the reflection tolerance of upstream signals by comparing Manchester-encoded
downstream signals with NRZ ones in a RSOA-based fiber loop back system for a WDM PON. The results showed that
the reflection tolerance of the upstream signals strongly dependeds on the downstream signal modulation formats, and
that the Manchester format was more tolerant than the NRZ one against the reflection of the upstream signal.
The optimum signal format and the optimum FEC code rate for 40 Gbit/s-based WDM systems have been studied experimentally and numerically. We found that the bandlimited CS-RZ with highly efficient FEC of between 80 % and 90 % code rates is expected to be a suitable solution for ultralarge-capacity long-haul 40 Gbit/s WDM systems.
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