Comparison of DWDM network topologies with bit-rate adaptive optical OFDM regarding restoration

Abstract

4 different core networks − including EU and US − are studied for bit-rate adaptive optical-OFDM w.r.t. restoration. The gained benefit over fixed bit-rate 40 Gb/s networks is found to be strongly mean path-length/mean connectivity dependent and reaches up to 42 % savings on OE-interfaces. IntroductionRapid increasing demand of capacity requires higher flexibility and transparency of future DWDM photonic network. So far mainly single line-rate based networks have been deployed but new emerging applications (IPTV, VOD, etc.) lead to more heterogeneous traffic demands. Networks based on mixed line rates (MLR) like 10G/40G or 10G/40G/100G were proposed

Evolution from Wavelength-Switched to Flex-Grid Optical Networks

“…This first concept of elastic networks is compliant with legacy systems (particularly ROADM) based on 50 GHz grid [19,20]. Such elastic optical network architectures with flexible data rate and spectrum allocation ensure high resource efficiency, low cost, and low power consumption.…”

“…This relies on the creation of "elastic" optical networks in which a single type of transceiver can operate at various data rates according to the characteristics (capacity and signal degradation) of each connection providing similar benefits as mixed-rate solutions but with increased flexibility. In general, an elastic optical network can be based on Orthogonal Frequency-Division Multiplexing (OFDM) technologies [18,19] or on 100 Gb/s Polarization-Division-Multiplexed Quaternary Phase Shift Keying (PDM-QPSK) transceivers adapted for modulation-format versatility, lowering its data rates [20].…”

Offline RSA algorithms for elastic optical networks with dedicated path protection consideration

“…Firstly, the reconfiguration ability of BV-T strongly reduces the required spare resources in terms of opto-electronic interfaces [18], [19]. It is achieved thanks to the share of the required spare interfaces for any connection independently of its data-rate.…”

Path Splitting for Virtual Network Embedding in Elastic Optical Networks

“…In EON, it is possible to change the wavelength grid [10], [11], [12]. This is because a wavelength can be divided into multiple frequency slots (FS) and bandwidth-variable transponders allow transmitting, receiving and switching optical signals at multiple FS intervals [13].…”