Probabilistic Analysis of Cyclic Packet Transmission Scheduling in WDM Optical Networks We study the packet transmission scheduling problem with tuning delay in wavelengthdivision multiplexed (WDM) optical communication networks with tunable transmitters and fixedtuned receivers. By treating the numbers of packets as random variables, we conduct probabilistic analysis of the averagecase performance ratio for the cyclic packet transmission scheduling algorithm. Our numerical data as well as simulation results demonstrate that the averagecase performance ratio of cyclic schedules is very close to one for reasonable system configurations and probability distributions of the numbers of packets. In particular, when the number of receivers that share a channel andor the granularity of packet transmission are large, the averagecase performance ratio approaches one. Better performance can be achieved by overlapping tuning delays with packet transmission. We derive a bound for the normalized tuning delay xcex94 such that tuning delay can be completely masked with high probability. Our study implies that by using currently available tunable optical transceivers, it is possible to build singlehop WDM networks that efficiently utilize all the wavelengths.

Reduction of Delay Overfulfillment in IPoverDWDM Transport Networks The traffic in todayxe2x80x99s transport networks is increasing dramatically due to more demanding applications like video on demand and improving access technologies like 5G. Additionally, the quality of service requirements are becoming more stringent while network operators are seeking new ways for revenue creation. We propose a multilayer network reconfiguration approach that reduces the overfulfillment of service delay requirements. In that way it provides an incentive to customers with lowdelay services to acquire a more expensive service class for their traffic. Additionally, it relieves highly utilized links for services with very strict delay requirements. We provide an ILP formulation that solves this multilayer network problem by performing a crosslayer optimization. Further, we evaluate our approach for two nationwide backbone networks. We show that a reduction of service delay overfulfillment is possible and how that affects other network metrics.