Design of Optical Switching Module for Gigabit Ethernet Optical Switched Access Network

Nomura, Tsuyoshi; Itoh, Chikashi; Kurokawa, Hiroaki; Tsuboi, Toshinori; Kasai, Hiroyuki

doi:10.1093/ietcom/e89-b.11.3021

Cited by 9 publications

(3 citation statements)

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“…To provide a scalable and secure access services, active access networks using packet-based optical switches were presented [8]- [10]. The literatures provide longer transmission distance than previous PON systems and high-security by using optical packet switches without optical buffers.…”

Section: Introductionmentioning

confidence: 99%

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Scalable Active Optical Access Network Using Variable High-Speed PLZT Optical Switch/Splitter

Ashizawa

Sato

Tokuhashi

et al. 2012

IEICE Trans. Commun.

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This paper proposes a scalable active optical access network using high-speed Plumbum Lanthanum Zirconate Titanate (PLZT) optical switch/splitter. The Active Optical Network, called ActiON, using PLZT switching technology has been presented to increase the number of subscribers and the maximum transmission distance, compared to the Passive Optical Network (PON). ActiON supports the multicast slot allocation realized by running the PLZT switch elements in the splitter mode, which forces the switch to behave as an optical splitter. However, the previous ActiON creates a tradeoff between the network scalability and the power loss experienced by the optical signal to each user. It does not use the optical power efficiently because the optical power is simply divided into 0.5 to 0.5 without considering transmission distance from OLT to each ONU. The proposed network adopts PLZT switch elements in the variable splitter mode, which controls the split ratio of the optical power considering the transmission distance from OLT to each ONU, in addition to PLZT switch elements in existing two modes, the switching mode and the splitter mode. The proposed network introduces the flexible multicast slot allocation according to the transmission distance from OLT to each user and the number of required users using three modes, while keeping the advantages of ActiON , which are to support scalable and secure access services. Numerical results show that the proposed network dramatically reduces the required number of slots and supports high bandwidth efficiency services and extends the coverage of access network, compared to the previous ActiON, and the required computation time for selecting multicast users is less than 30 msec, which is acceptable for on-demand broadcast services.

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Section: Introductionmentioning

confidence: 99%

“…To increase the bandwidth efficiency and achieve transparent transmission without O/E conversion, while keeping the advantages of the active access network [8]- [10], the active optical access network architecture using slot-based optical switches has been presented. It is called Active Optical Network (ActiON) [11].…”

Section: Introductionmentioning

confidence: 99%

Scalable Active Optical Access Network Using Variable High-Speed PLZT Optical Switch/Splitter

Ashizawa

Sato

Tokuhashi

et al. 2012

IEICE Trans. Commun.

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“…Secondly, IP technology enhances the transmission rate. A lot of research works [13][14][15][16] have proven that packet-switch can provide better bandwidth sharing. This is important because of the limited throughput resource in wireless networks.…”

Section: Future Wireless Networkmentioning

confidence: 99%

Mobility support and bandwidth aggregation in heterogeneous wireless networks

Zhong¹

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The future wireless communication system is envisioned to be an IP-based, ubiquitous system with heterogeneous wireless networks integrated, where multiple wireless technologies converge to a common infrastructure. The unified system can bring users many benefits such as the expansion of coverage and the aggregation of multiple-path bandwidth. However, before enjoying these benefits, a lot of issues need to be solved. This thesis focuses on proposing solutions for two issues: mobility management and bandwidth aggregation. According to the service ranges, mobility management can be classified into two categories: intra-domain mobility and inter-domain mobility. Intra-domain mobility handles user's reachability within a single domain while inter-domain mobility handles outside domain. Efficient Framework for Local Mobility Management (EFLoM) is a inter-domain mobility which employs a IP swapping technology to deliver traffic. Specifically, EFLoM employs three network entities: Mobile Node (MN), Local Anchor Router (LAR) and Wireless Access Gateway (WAG). MN is the mobile device held by users. LAR is the gateway and it holds the location information of MN. WAG is an access router of the network in the domain which regulates the intra-domain connection. When a data packet arrives, LAR updates the destination IP header with MN's current location and sends to MN. On reception, MN restores the destination address and pass on to applications. Because IP swapping can remove the tunnel header, EFLoM outperform other mobility protocols in terms of route hops, protocol signaling cost, handover delay and traffic overhead. Except EFLoM, this thesis proposes a inter-domain mobility framework named Traffic Distributor Inter-Domain Mobility (TDIDM). Through placing a new network entity named Traffic Distributor (TD) in the aggregate network, TDIDM interconnects neighboring local Contents vii domains. When MN moves out of one domain into another, TD is notified. TD then tunnels the traffic to the new domain. After the traffic arrives at the new domain, the local mobility protocol (e.g., EFLoM) takes over the responsibility to deliver the traffic. Moreover, TDID-M develops an algorithm to select a TD set. The TD set covers MN's traffic in all paths while reducing the redirection time. Experiments have been conducted to compare it with Neumann's proposal which is another proposal to handle inter-domain issues. Results show that our TDIDM is a feasible alternative for inter-domain handover, and TDIDM outperforms Neumann's proposal in terms of binding cache entry number, transmission delay and handover delay. The third part of the thesis is a multipath scheduling algorithm, named Adaptive Load Balancing Algorithm (ALBAM). Targeting at solving adverse impacts on TCP flows, AL-BAM employs four techniques. Firstly, ALBAM takes advantage of the bursty nature of TCP flows and performs scheduling at the flowlet granularity where the packet interval is large enough to compensate for the different path delays. Secondly, ALBAM develops a packe...

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Development of Gigabit Ethernet Optical Switched Access Network System Using Optical Packet Switches

Nomura¹,

Kikuchi²,

Tsuboi

et al. 2008

IEICE Transactions on Communications

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Design of Optical Switching Module for Gigabit Ethernet Optical Switched Access Network

Cited by 9 publications

References 0 publications

Scalable Active Optical Access Network Using Variable High-Speed PLZT Optical Switch/Splitter

Scalable Active Optical Access Network Using Variable High-Speed PLZT Optical Switch/Splitter

Mobility support and bandwidth aggregation in heterogeneous wireless networks

Development of Gigabit Ethernet Optical Switched Access Network System Using Optical Packet Switches

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