We evaluate through computer simulation the performance of Photonic switching OPS/OBS networks of various sizes and configurations, based on a lossless (amplified) photonic switching node experimentally demonstrated previously. The great advantage of photonic switching is transparency to signal rate and format. Thus we propose a basic flexible network, with low-energy consumption and high-efficiency. In simulations traffic load is varied and network parameters such as, average number of hops (ANH), network latency (delay) and packet loss fraction are evaluated. Consistent results for the various configurations are presented, analyzed and discussed; and Interesting conclusions emerge.
Results and analysis of semiconductor optical amplifiers (SOA) are presented as applied to Photonic switching nodes in OPS/OBS future optical networks. Detailed characterization is provided to investigate physical constraints of optical power, gain and noise figure of SOAs. Two different lasers, one external cavity tunable laser and one DFB laser, verify that although the SOA gain is not significantly sensitive to input source a clear difference on the noise figure (NF) is observed. Another important result is that by limiting the average number of hops in the network accumulated ASE power from the amplifiers should not impair signal quality.
A new system for generation, switching and routing of optical packets in photonic networks, having 2x2 optical transparent nodes, is described. The optical packets are constituted of a frequency tone header in the low RF range (MHz), and a digital payload which can be of different rates or formats, in the range 1 to 5 Gb/s. Packets can have time frame between 2-6 μs, with separate fields for header and payload; the header field being much shorter than the payload field. The optical packet switch node includes blocking, routing and drop functions, controlled by electronic logic circuits, processing only the header information. Switching is performed on a packet-by-packet basis; and packets are routed according to header frequency allocation, which relates to node output ports and packet destination node addresses. Processing times for header recognition and packet switching are 2 μs. The digital payload remains untouched throughout the network, delivering high-bandwidth to final users, with very low latency in the network, and very small packet loss. This system is designed for application in metro-access next-generation optical networks (NGON), one example being interconnection of high-capacity wireless base stations.
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