Network resource advantages of bidirectional wavelength-path switched ring

Shiragaki, T.; Takeshita, Hitoshi; Shimomura, H.; Nakamura, Shigeru; Henmi, N.

doi:10.1109/68.789732

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…However, since the mature SONET/SDH systems are globally adopted, the protection of metro WDM networks is currently developed based on a TDM-based fiber ring architecture. The restoration operations of WDM rings is very similar to that of common TDM rings, such as the Unidirectional Wavelength-Path Switched Ring (UWPSR) and the Bidirectional Wavelength-Path Switched Ring (BWPSR) [7], whereas the resources of switching are now expanded to both fibers and wavelengths. However, some shortages from TDM systems are inherited by WDM protection such as the resources (wavelengths) wasted for reserved protection use.…”

Section: Wdm Protectionmentioning

confidence: 99%

Evolution of Protection Technologies in Metro Core Optical Networks

Sheng

2006

International Conference on Networking and Services (ICNS'06)

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The market of metro optical networking has increased rapidly over the last few years. Traditional telecommunication infrastructure has an emphasis on long-haul optical transmission with ultra broadband capacity, relying mostly on large pure Dense Wavelength Division Multiplexing (DWDM) systems. Today, however, metro core optical networks take the major role in provisioning local access services and interconnecting service points of presences (POPs) with long-haul transmission. This represents a pivotal point in business operations of data communication services for service providers and large enterprises. In addition, the upper layer data services completely leans upon the substrate wavelength communication, and hence the survivability and reliability issues in the optical domain are now becoming crucial topics. This paper provides a detailed discussion around the development process of protection technologies in metro core optical transport infrastructure.

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Section: Wdm Protectionmentioning

confidence: 99%

Evolution of Protection Technologies in Metro Core Optical Networks

Sheng

2006

International Conference on Networking and Services (ICNS'06)

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“…A novel bi-directional wavelength-path switched WDM ring has been proposed and analyzed [5]. This WDM ring is more advantageous than other ring architecture in terms of wavelength utilization efficiency, the maximum circumference for transparent ring, and the necessary number of 3R-regenerators for a large-sized opaque ring [5].…”

Section: Introductionmentioning

confidence: 99%

“…This WDM ring is more advantageous than other ring architecture in terms of wavelength utilization efficiency, the maximum circumference for transparent ring, and the necessary number of 3R-regenerators for a large-sized opaque ring [5]. In this paper, we further conduct an experiment to demonstrate a fast optical layer protection of OC-48c traffic by this four-fiber selfhealing WDM ring.…”

Section: Introductionmentioning

confidence: 99%

Optical Layer Protection of ATM Traffics using a Novel 4-Fiber WDM Ring with an Ability to carry Extra Traffic

Shi¹,

Chen²

2001

Journal of Optical Communications

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ATM/IP directly over WDM ring with optical layer protection is proposed and demonstrated. Traffics are 1+1 protected ATM OC-48c and a low priority part-time OC-48c IP traffic. When either fiber or cable failure occurs, optical layer protection can restore the ATM traffic via optical layer span/ring protection within 13 ms/23 ms while the part-time traffic is dropped. A faster protection time comparing with SONET standard is experimentally verified by both physical layer and ATM layer test results.

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“…The WDM optical ring networks can be divided into two catagories according to the object being protected -optical path protection switching ring network and the optical line protection switching ring [2,3] network. In an optical line protection switching ring, the multplexed section is protected by the collaboration ofthe nodes before and after the fiber cut.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time wavelength routing simplifies the node structure by using optical add/drop multiplexers (OADMs) and optical cross-connects (OXCs) in the network [1].The WDM optical ring networks can be divided into two catagories according to the object being protected -optical path protection switching ring network and the optical line protection switching ring [2,3] network. At the same time wavelength routing simplifies the node structure by using optical add/drop multiplexer (OADM) and optical cross-connect (OXC) in the network.…”

mentioning

confidence: 99%

<title>Novel OADM structure for two-fiber unidirectional optical path protection switching ring networks</title>

Zong

Zhang

et al. 2000

SPIE Proceedings

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SWavelength Division Multiplexing (WDM) optical ring network is becoming more and more attractive due to its high capacity and survivability against fiber breaks. At the same time wavelength routing simplifies the node structure by using optical add/drop multiplexer (OADM) and optical cross-connect (OXC) in the network. In the two-fiber unidirectional optical path-protection switching ring (TUPSR) network, two separate OADM equipments are required to add/drop channels from the two fiber-rings simultaneously. Due to this high price, the cost benefit introduced by the WDM systems is reduced. In this paper, a novel OADM structure is proposed and demonstrated for two-fiber unidirectional optical path protection switching ring network. The OADM is designed with only one arrayed-waveguide grating (AWG) multiplexer in a loop-back configuration. Being used in bidirectional mode, the proposed OADM can add and drop any channel to and from both fiber-rings of the TUPSR simultaneously with only one module. As a result it is cost effective. Experimental results show that the degradation observed in the receiver sensitivity is very limit when the proposed OADM module is used in the two-fiber unidirectional optical protection switching ring network to add/drop multiple channels. The restoration time is less than 7 ms, which satisfies the requirement of ITU-T recommendations. Performance of the TUPSR against the two-fiber unidirectional optical line protection switching ring (TULSR) is also analyzed. It can be derived that the TUPSR has better performance compared to the TULSR not only on the transparent-ring circumference but also on the reliability and the simplicity of control.keywords optical add/drop multiplexer (OADM), wavelength division multiplexing (WDM), two-fiber unidirectional optical path protection switching ring (TUPSR), two-fiber unidirectional optical line protection switching ring(TUPSR), . INTRODUCTIONWavelength Division Multiplexing (WDM) optical ring network is becoming more and more attractive due to its high capacity and survivability against fiber breaks. At the same time wavelength routing simplifies the node structure by using optical add/drop multiplexers (OADMs) and optical cross-connects (OXCs) in the network [1].The WDM optical ring networks can be divided into two catagories according to the object being protected -optical path protection switching ring network and the optical line protection switching ring [2,3] network. In an optical line protection switching ring, the multplexed section is protected by the collaboration ofthe nodes before and after the fiber cut. APS (automatic protection switching) protocol is required during the protection procedure. As a result the protection is slow and complicated. Whereas in an optical path protection switching ring network, each of the opitcal signal is transmitted via two different physical paths that are call working path and protection path respectively. At the destination node the two signals are monitored and only the one with better quality ...

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Network resource advantages of bidirectional wavelength-path switched ring

Cited by 9 publications

References 2 publications

Evolution of Protection Technologies in Metro Core Optical Networks

Evolution of Protection Technologies in Metro Core Optical Networks

Optical Layer Protection of ATM Traffics using a Novel 4-Fiber WDM Ring with an Ability to carry Extra Traffic

<title>Novel OADM structure for two-fiber unidirectional optical path protection switching ring networks</title>

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