Contention resolution by shared wavelength converters and fiber delay lines in an optical packet switch

2003 ◽  
Vol 38 (5) ◽  
pp. 395-398
Author(s):  
Li Yi ◽  
H. Ghafouri-Shiraz
Keyword(s):  
Wavelength Converters ◽  
Contention Resolution ◽  
Delay Lines ◽  
Fiber Delay Lines ◽  
Optical Packet Switch ◽  
Packet Switch

An Optical Packet Switch with Recirculation Limited Range Wavelength Converter Groups and Recirculation Optical Buffers

2016 ◽  
Vol 37 (2) ◽  
Author(s):  
Jie Li
Keyword(s):  
Control Algorithm ◽  
Wavelength Conversion ◽  
Limited Range ◽  
Loss Probability ◽  
Wavelength Converters ◽  
Delay Lines ◽  
Wavelength Converter ◽  
Fiber Delay Lines ◽  
Optical Packet Switch ◽  
Packet Switch

AbstractThis paper focuses on performances of limited range wavelength converters (LRWCs) in resolving optical packet contentions. An optical packet switch is proposed, which uses recirculation LRWC groups and recirculation fiber delay lines (FDLs) to resolve optical packet contentions. In order to make full use of the LRWCs and the FDLs, a control algorithm is also proposed. Packet loss probability of the proposed switch versus the number of FDLs, the wavelength conversion range, and the number of LRWC groups are evaluated in detail.

scholarly journals Analysis of Hybrid Buffering and Retransmission in OBS Networks

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
D. Veera Vanitha ◽  
M. Sabrigiriraj
Keyword(s):  
Retrial Queue ◽  
Wavelength Converters ◽  
Single Server ◽  
Contention Resolution ◽  
Delay Lines ◽  
Hybrid Scheme ◽  
Maintenance Activity ◽  
Burst Switching ◽  
Fiber Delay Lines ◽  
The Mean

Burst contention is a major problem in the Optical Burst Switching (OBS) networks. Due to inadequate contention resolution techniques, the burst loss is prominent in OBS. In order to resolve contention fiber delay lines, wavelength converters, deflection routing, burst segmentation, and retransmission are used. Each one has its own limitations. In this paper, a new hybrid scheme is proposed which combines buffering and retransmission, which increases the mean number of bursts processed in the system. In this hybrid method, retransmission with controllable arrival and uncontrollable arrival is analyzed. Normally all the bursts reach the first hop and few of them go for second hop to reach destination. After all the bursts reach the destination the server may go for maintenance activity or wait for the arrival of next burst. We model it as a batch arrival single server retrial queue with buffer. Numerical results are analyzed to show the mean number of bursts processed in the system with uncontrollable arrival and controllable arrivals.

Optimization of WDM optical packet switches with sparse Wavelength Converters and non-degenerate Fiber Delay-Lines

2005 ◽  
Vol 22 (4) ◽  
pp. 333-344
Author(s):  
Zhizhong Zhang ◽  
Fang Cheng ◽  
Huandong Zhao ◽  
Qingji Zeng
Keyword(s):  
Wavelength Converters ◽  
Delay Lines ◽  
Packet Switches ◽  
Fiber Delay Lines

Contention resolution and QoS provisioning using sparse fiber delay lines in WDM networks

2006 ◽  
Vol 13 (1) ◽  
pp. 111-122 ◽  
Author(s):  
Mounire El Houmaidi ◽  
Mostafa A. Bassiouni ◽  
Guifang Li
Keyword(s):  
Wdm Networks ◽  
Contention Resolution ◽  
Delay Lines ◽  
Qos Provisioning ◽  
Fiber Delay Lines

scholarly journals Architecture and Performance Evaluation of a Novel Optical Packet Switch with Input Concentrators

Photonics ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 510
Author(s):  
Hongzhen Yang ◽  
Xiuwei Mao ◽  
Zilu Fang ◽  
Wanke Chen ◽  
Ting Wang ◽  
...  
Keyword(s):  
Packet Loss ◽  
Cost Savings ◽  
Economic Cost ◽  
Packet Delay ◽  
Traffic Load ◽  
Buffer Size ◽  
Wavelength Converters ◽  
Single Output ◽  
Optical Packet Switch ◽  
Packet Switch

In this paper, we propose a novel optical packet switch (OPS) architecture with input concentrators, which employ multi-input single-output optical buffers to aggregate all the incoming traffic into a small size switching fabric. Accordingly, the physical size, the number of the needed wavelength converters, and the economic cost of the total OPS node are decreased dramatically. However, the deployment of input concentrators introduces additional packet loss and delay, except from the contention at the switch output. A Markov model is presented to study the packet loss ratio (PLR) and average packet delay given by the input concentrators. The corresponding closed form expressions are given. The model also demonstrates that the system performance can be greatly improved by increasing the buffer size when the traffic load is not larger than 0.69315. The analytical values are compared with the simulation results. All the obtained results show that the proposed model provides satisfactory approximations under different network scenarios. Moreover, the economic cost savings of the proposed OPS node at the present time and its evolution as a function of time are also discussed in detail. The proposed architecture can also be applied in a packet enhanced optical transport network (OTN).

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