In data center networks use of optical communication has revolutionized the data transfer mechanism. Optical communication heavily relies on enormous bandwidth of optical fiber. Wavelength Division Multiplexing (WDM) technique can be used for utilization of huge bandwidth. To employ WDM which uses distinct set of wavelengths to carry data wavelength converters are required. However as the tunable range of wavelength converter increases both cost and technological design complexity rises exponentially. Therefore, both Limited Range Wavelength Converter (LRWC) and Full Range Wavelength Converter (FRWC) are considered. However, under higher loading conditions buffering is also required as using wavelength converter (WC) blocking can be reduced significantly. This paper presents comprehensive analysis of blocking performance under various types of wavelengths converters and buffering of contending packets.
Optical packet switching has gained lot of momentum in last decade due to the advantages of optical fiber over copper cables. Optical switching is beneficial in optical networks which form connections of links and switching nodes. In these high speed networks minimum delay and high throughput are two important parameters which are considered. To minimize network delay shortest path algorithm is used for route selections. In previous studies while choosing shortest path distance among various nodes is considered. In this work we have shown that it is necessary to consider both distance and number of hops while choosing path from source to destination to minimize power per bit used for the transmission.
Optical burst switching is a high-speed data transfer technology where, in place of isolated packets, a bunch of packets known as a burst is sent. However, this mechanism is simple in transmission and reception as bursts propagate on a dedicated path, but burst assembly is a complex problem, and till date, the optimum burst length for data transmission is not fixed. This is the main hurdle in the implementation of OBS. In this paper, a mathematical model is developed to obtain network traffic flow equations and packet/bust drop rates under with and without considering the buffers at various nodes of the switches. The burst length modelling is also detailed, and finally, Monte Carlo simulation is performed to obtain various results. The obtained results clearly reveal that the proposed mathematical model is well in agreement of simulation results.
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