A local improvement approach for survivable long-reach hybrid WDM-TDM PON design

Long-reach hybrid WDM-TDM PONs connect far away service areas to center offices of service providers. Typically, multiples fiber cables run from the center office side to each service area in order to feed the service area with data flows. We believe that mesh topology in service areas allows AWGs feeding each other and consequently less fiber cables need to be run between center offices and service areas. In this paper, we show some typical cases where mesh connections between AWGs are useful. We propose also an efficient algorithm based on Local improvement approach for designing survivable long-reach hybrid WDM-TDM PONs where mesh topology between AWGs is allowed. The experimental results show that a large percentage of PONs should use mesh topology in service areas in order to minimize the total PON deployment cost.