Satyajeet Ahuja

Total cost of ownership of WDM and switching architectures for next-generation 100Gb/s networks

The bandwidth efficiency and relative costs for 100 Gb/s WDM transport and switching architectures are compared in North American and pan-European long-haul networks. The first architecture uses muxponders and ROADMs for end-to-end wavelength transport with no digital sub-wavelength grooming. The other two utilize digital OTN switching, as either a standalone OTN switch or a converged integrated WDM/switch system, to efficiently groom services onto WDM wavelengths. Results show the integrated WDM/switch architecture utilizes the fewest WDM wavelengths and client service interfaces, and an integrated WDM/switch architecture using photonic integrated circuit technology provides the lowest operational costs.

Linear phase variable digital bandpass filters

A transformation for obtaining a linear phase variable cut-off low-pass digital filter has been recently described in the literature [1]. In this letter, this transformation is worked out for the case of linear phase bandpass digital filters with variable bandwidth and center frequency.

Comparing optical & OTN switching architectures in next-gen 100Gb/s networks

Bandwidth efficiency for 100Gb/s WDM and switch architectures are compared in a North American long-haul network. Results show that OTN grooming utilizes fewest WDM wavelengths, and integrated WDM/switch architecture utilizes fewest client service interfaces.