Statistical Multiplexed Optical Burst-Train Switching Network

Abstract

The Optical Burst-Train Switching (OBTS) network efficiently transports multi-granular subwavelength constant-bit-rate (CBR) and variable-bitrate (VBR) traffic streams over an all-optical network with sparse wavelength convertibility while minimizing access blocking of traffic streams. Sub-wavelength traffic streams are shaped into periodic burst-trains at network edge with variable burst sizes. Proactive periodic reservation of burst-trains minimizes reservation signaling and scheduling overheads. OBTS combines variable-sized-slot time division multiplexing over network core and stream-based statistical multiplexing at network edge to provide guaranteed bandwidth for CBR traffic, while minimizing data loss of average-provisioned VBR traffic. Performance of OBTS is analyzed in terms of stream or burst-train blocking and data loss of average-rate provisioned VBR traffic. The tuning effects on OBTS performance are investigated with regards to wavelength convertibility factor, switching latency, periodic scheduling frame size, burst size and traffic burstiness. I.