In this paper, we study restoration mechanisms to handle channel and link failures in an optical wavelength division multiplexed (WDM) wavelength-routed wide-area backbone network based on a mesh topology. The solution uses a small number of tunable lasers to provide restoration capability. We consider two types of failures: link failures and individual channel (or wavelength) failures that occ...

In this paper, we have analyzed the performance of WDM Ethernet Passive Optical Network (EPON) with Radio over Fiber (RoF) optical link with the use of Dispersion compensating fiber at the transmission section. Performance of the system is improved with the use of DCF. The results are compared with and without DCF. The BER, Q factor and eye diagrams have been used for evaluating the performance...

In this paper, the link quality in SHF and EHF ranges are studied. In order to achieve high data rate higher frequencies must be used – centimeter waves (SHF), millimeter waves (EHF) or optical range. However, there are significant problem when a radio link work in that diapason – rain attenuation and attenuation in earth’s atmosphere. Based on statistical rain rates data for Bulgaria, the link...

We discuss enhancements to the OSPF protocol for routing and topology discovery in optical mesh networks. OSPF’s opaque LSA mechanism is used to extend OSPF to disseminate optical resource related information through optical LSAs. Standard link-state database flooding mechanisms are used for distribution of optical LSAs. Each optical LSA carries optical resource information pertaining to a sing...

In this paper, the link quality in SHF and EHF ranges are studied. In order to achieve high data rate higher frequencies must be used – centimeter waves (SHF), millimeter waves (EHF) or optical range. However, there are significant problem when a radio link work in that diapason – rain attenuation and attenuation in earth’s atmosphere. Based on statistical rain rates data for Bulgaria, the link...