Performance comparison between recirculating loop buffer-based optical packet switch architectures (original) (raw)
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Recirculating Buffer and Arrayed Waveguide Grating-Based Switch for Optical Data Centers
Journal of Optical Communications, 2018
Recently, an explosive growth has been observed in data traffic, which restricts the speed of exiting data communication network. To solve such problem, fiber optical-based optical communication is preferred choice. In this paper, a switch design is proposed to tackle contention problem in Optical Packet Switching (OPS) and data center networks. The proposed switch is compared with recently proposed switch design and advantages of proposed design are presented. To show superiority of the proposed design over earlier one, mathematical modeling is presented and expressions for noise figures and Bit Error Rate (BER) are derived. Using the mathematical framework, switch analysis is done in terms of BER and packet loss probability, and it has been found that power required for correct operation of the switch is lesser in comparison to earlier one. The effect of recirculation count on packet loss probability is detailed. The network layer analysis in terms of packet loss probability is al...
2014 16th International Conference on Transparent Optical Networks (ICTON), 2014
Potentially, optical packet switching architectures can alleviate the power consumption, bandwidth and connectivity constraints that existing electronically-switched networks are encountering as interconnects in Data centers and High Performance Computing (HPC) platforms scale out to many thousands of processing nodes. In this paper, we propose a novel optical packet switch architecture, based on the Arrayed Waveguide Grating Router (AWGR), which requires many less tunable wavelength converters than wavelength channels and where contention is efficiently resolved using a low-power re-circulating optical delay module. Compared to previous schemes which propose using an electronic buffer to resolve packet contentions in this type of architecture, we show through simulation that our scheme can improve scalability, by reducing switch power consumption by up to 50% while maintaining low packet latencies. By proper integration of the buffer into the switch and correct dimensioning of the optical buffers, packet loss rates of < 10 −10 are achievable.
SLOB: a switch with large optical buffers for packet switching
Journal of Lightwave Technology, 1998
Recently, optical packet switch architectures, composed of devices such as optical switches, fiber delay lines, and passive couplers, have been proposed to overcome the electromagnetic interference (EMI), pinout and interconnection problems that would be encountered in future large electronic switch cores. However, attaining the buffer size (buffer depth) in optical packet switches required in practice is a major problem; in this paper, a new solution is presented. An architectural concept is discussed and justified mathematically that relies on cascading many small switches to form a bigger switch with a larger buffer depth. The number of cascaded switches is proportional to the logarithm of the buffer depth, providing an economical and feasible hardware solution. Packet loss performance, control and buffer dimensioning are considered. The optical performance is also modeled, demonstrating the feasibility of buffer depths of several thousand, as required for bursty traffic.
Design and Analysis of AWG and ReCirculating Buffer based Optical Packet Switch
2017
Optical switches are essential not only in optical packet networks but also in data centers. This paper, discusses a optical packet switch design. The switch design considered in the paper is re-circulating in nature. The re-circulating nature is achieved with a few components in compare to earlier switches design published in past. This paper presents a mathematical framework, to obtain number of re-circulation count of the packet inside the buffer. Thus required amount of power for correct operation of switch is lesser in comparison to earlier designs.
A Comparison and Performance of Different Optical Switching Architectures
Int'l J. of Communications, Network and System Sciences, 2011
Optical Packet Switching (OPS) and transmission networks based on Wavelength Division Multiplexing (WDM) have been increasingly deployed in the Internet infrastructure over the last decade in order to meet the huge increasing demand for bandwidth. Several different technologies have been developed for optical packet switching such as space switches, broadcast-and-select, input buffered switches and output buffered switches. These architectures vary based on several parameters such as the way of optical buffering, the placement of optical buffers, the way of solving the external blocking inherited from switching technologies in general and the components used to implement the WDM. This study surveys most of the exiting optical packet switching architectures. A simulation-based comparison of input buffered and output buffered architectures is presented. The performance analysis of the selected two architectures is derived using simulation program and compared at different scenarios. We found that the output buffered architectures give better performance than input buffered architectures. The simulation results show that the-broadcast-and-select architecture is attractive in terms that it has lees number of components compared to other switches.
WDM-based optical packet switch architectures
Journal of Optical Networking, 2008
We have compared different loop buffer switch architectures in terms of their functionality. Some of these architectures have already been proposed with only their description and operation. The performance evaluation of the switches has been done in terms of packet loss probability for random and bursty traffic. A new architecture has been proposed, which incorporates the good features of the existing architectures.
Performance Analysis of Different Optical Switching Architectures
Journal of Computer Science, 2011
Problem statement: Optical Packet Switching (OPS) and transmission networks based on Wavelength Division Multiplexing (WDM) have been increasingly deployed in the Internet infrastructure over the last decade in order to meet the huge increasing demand for bandwidth. Several different technologies have been developed for optical packet switching such as space switches, broadcast-and-select, input buffered switches and output buffered switches. These architectures vary based on several parameters such as the way of optical buffering, the placement of optical buffers, the way of solving the external blocking inherited from switching technologies in general and the components used to implement WDM. Approach: This study surveys most of the exiting optical packet switching architectures. A simulation-based comparison of input buffered and output buffered architectures were presented. Results: The performance analysis of the selected two architectures derived using simulation program and compared at different scenarios. We found that the output buffered architectures give better performance than input buffered architectures. Conclusion: The simulation results shows that the-broadcast-and-select architecture is attractive in terms that it has lees number of components compared to other switches.
Hardware implementation of optical switching node for data center networks
Microwave and Optical Technology Letters, 2018
In high performance data center networks, switching the data from source node to destination node needs a proper signal processing to decode the address bits and switch the data and to avoid contention. In this article, we propose the hardware design for switching the data from one node to other bi-directionally. The design is verified in an experimental test bed.
Hybrid Optical Switching for Data Center Networks
Journal of Electrical and Computer Engineering, 2014
Current data centers networks rely on electronic switching and point-to-point interconnects. When considering future data center requirements, these solutions will raise issues in terms of flexibility, scalability, performance and energy consumption. For this reason several optical switched interconnects, which make use of optical switches and wavelength division multiplexing (WDM), have been recently proposed. However, the solutions proposed so far suffer from low flexibility and are not able to provide service differentiation. Furthermore, very few studies evaluate scalability and energy consumption and make extensive comparison with current data center networks. In this paper we introduce a novel data center network based on hybrid optical switching (HOS). HOS combines optical circuit, burst and packet switching on the same network. In this way different data center applications can be mapped to the optical transport mechanism that best suits to their traffic characteristics. Furthermore, the proposed HOS network achieves high transmission efficiency and reduced energy consumption by using two parallel optical switches; a slow and low power consuming switch for the transmission of circuits and long bursts, and a fast switch for the transmission of packets and short bursts. We consider the architectures of both a traditional data center network and the proposed HOS network and present a combined analytical and simulation approach for their performance and energy consumption evaluation. We demonstrate that the proposed HOS data center network achieves high performance and flexibility while considerably reducing the energy consumption of current solutions.
Large data center interconnects employing hybrid optical switching
Proceedings of the 2013 18th European Conference on Network and Optical Communications & 2013 8th Conference on Optical Cabling and Infrastructure (NOC-OC&I), 2013
Current data centers (DCs) networks rely on electronic switching and point-to-point interconnects. When considering future DC requirements, point-to-point interconnects will lead to poor network scalability and large power consumption. For this reason several optical switched interconnects for DCs have been recently proposed. However, the proposed optical switching solutions suffer from low flexibility and are not able to provide service differentiation. Furthermore, very few studies evaluate possible improvements in energy efficiency offered by optical switching solutions. In this paper we introduce a novel architecture of interconnects for DCs based on hybrid optical switching (HOS). HOS combines three different optical switching paradigms, namely circuit, burst and packet switching within the same network. Furthermore, HOS envisages the use a two parallel optical switches, a slow and low power consuming switch for the transmission of data using circuits and long bursts, and a fast switch for the transmission of packets and short bursts. The possibility of choosing between circuits, bursts and packets ensures the flexibility required by future DCs. At the same time, the option to select the most suitable switch technology for each data flow guarantees high transmission efficiency and low power consumption.