Asynchronous Variable-Length Optical Packet Switch with Delay-Line Loop Buffers

Jeong, Jun Young; Jeong, Je‐Myung

doi:10.1093/ietcom/e91-b.2.589

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…In OCS networks, circuits (connections) are established end to end by reserving a set of wavelengths on each fiber along the path during the setup phase. OCS is typically suitable for voice traffic but inefficient for data traffic due to large granularity aggregated traffic, which reduces the utilization of the OCS network [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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On the design of asynchronous optical packet switch architectures with shared delay lines and converters

2011

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Optical packet switching (OPS) is a promising technology to enable next-generation high-speed IP networks. A major issue in OPS is packet contention that occurs when two or more packets attempt to access the same output fiber. In such a case, packets may be dropped, leading to degraded overall switching performance. Several contention resolution techniques have been investigated in the literature including the use of fiber delay lines (FDLs), wavelength converters (WCs), and deflection routing. These solution typically induce extra complexity to the switch design. Accordingly, a key design objective for OPS is to reduce packet loss without increasing switching complexity and delay. In this paper, we investigate the performance of contention resolution in asynchronous OPS architectures with shared FDLs and WCs in terms of packet loss and average switching delay. In particular, an enhanced FDL-based and a novel Hybrid architecture with shared FLDs and WCs are proposed, and their packet scheduling algorithms are presented and evaluated. Extensive simulation studies show that the performance of proposed FDL-based architecture outperforms typical OPS architectures reported in the literature. In addition, it shown that, for the same packet loss ratio, the proposed hybrid architecture can achieve up to 30% reduction in the total number of ports and around 80% reduction in the overall length of fiber as compared to the FDL-based architectures.

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Section: Introductionmentioning

confidence: 99%

“…Control packets are sent first to reserve the resources in intermediate nodes along end-toend path. The data burst follows the control packet with some offset time [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

On the design of asynchronous optical packet switch architectures with shared delay lines and converters

2011

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“…Therefore OCS is suitable for very high speed and continuous traffic but inefficient for data traffic due to large granularity aggregated traffic which reduces the utilization of the OCS [4], [5], [6], [7].…”

Section: Introductionmentioning

confidence: 99%

“…Control packets are sent first to reserve the resources in intermediate nodes along end-toend path. The data burst follows the control packet with some offset time [4], [5], [6], [7], [8], [9].…”

Section: Introductionmentioning

confidence: 99%

An enhanced OPS architecture with optical buffers

Ismail¹,

Hamza²,

Elsayed

et al. 2009

2009 6th International Symposium on High Capacity Optical Networks and Enabling Technologies (HONET)

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Optical Packet Switching (OPS) is a promising technology to enable next-generation high-speed IP networks. One of the main components in an OPS network is the optical switch architecture that provides the basic functionality of switching packets from input ports to the desired output ports while maintaining data in the optical domain. In asynchronous OPS networks, contention may arise when two or more packets need to be directed to the same output source leading to packet loss and thus lower switching performance. Optical buffering, which is implemented by fiber delay lines (FDLs), is one of the approaches used for resolving contention. In this paper, we focus on the design a new FDL-based switch architecture that resolves packet contention in asynchronous OPS networks and achieves the same performance as that of best known architectures but with a reduced hardware complexity. Our analysis shows that, the proposed architectures possess some interesting properties as compared to existing designs. For example, for the same packet loss level, the proposed architecture requires a number of switch ports less than that used in generic architecture.

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“…There-fore, the buffers mentioned above suffer from power consumption and control limitations. Jeong et al [9] theoretically proposed a variable-length optical packet switch based on a packet compression scheme and delay line loop buffer. In this Letter, we propose a novel scheme to achieve variable-length and fast reconfigurable buffer by using cascaded optical buffer based on nonlinear polarization rotation (NPR) in an SOA.…”

mentioning

confidence: 99%