Co Existence Of Packets And Bursts In High Speed Networks

Abstract

In modern network computing, there is a high demand for bandwidth to satisfy the core newlinecomputing requirements of data-intrinsic applications. Moreover, the bandwidth newlinedemand is coupled with the challenge of low-latency Round Trip Time (RTT) of newlineswitched data among the core network. To satisfy the dual requirements, the focus has newlineshifted towards optical network-based communication. Thus, optical networking, newlinethrough fibre lines, is considered a viable choice for the core computing infrastructures, newlinenamely in data centres. In optical networking, two types of key switching technologies newlineare proposed for routing packets through the core networks- Optical Packet Switching newline(OPS), and Optical Burst Switching (OBS). newlineIn OPS, packets are routed through a core optical fibre backbone based on source newlineand destination Internet Protocol (IP) addresses. In the backbone, optical switches newlinereceive packets in enormous quantities, and thus many packets are faced with newlinecontention for the outgoing line. In case of contention, the packets can be re-circulated newlinethrough fibre-delay lines (FDL) that include delay slots that are computed based on newlinepacket size. FDL allows packets to re-circulate optically at a high speed that tends to newlineform an optical storage unit. However, FDL recirculation is limited, and thus, OPS newlinerequires effective large buffers for the storage of contending packets. The contention newlineduration depends on average RTT times the line bandwidth, to avoid congestion at the newlinetransport layer. To address the buffer limitations, researchers globally have proposed newlinesolutions for contention like wavelength conversion and deflection routing. In newlinewavelength conversion, for the contending packet, the optical switch tries to find an newlineidle wavelength to assign to the packet. In case, the free wavelength is not available for newlinethe same fibre, it would assign the packet to another fibre where the contention problem newlineis not present. In deflection routing, the contending packet is re-routed through another newlineidle line, to avoid the buffering of the packet at the