[Show abstract][Hide abstract] ABSTRACT: The paper presents a novel network architecture on demand approach using on-chip and-off chip implementations, enabling programmable, highly efficient and transparent networking, well suited for intra-datacenter communications. The implemented FPGA-based adaptable line-card with on-chip design along with an architecture on demand (AoD) based off-chip flexible switching node, deliver single chip dual L2-Packet/L1-time shared optical network (TSON) server Network Interface Cards (NIC) interconnected through transparent AoD based switch. It enables hitless adaptation between Ethernet over wavelength switched network (EoWSON), and TSON based sub-wavelength switching, providing flexible bitrates, while meeting strict bandwidth, QoS requirements. The on and off-chip performance results show high throughput (9.86Ethernet, 8.68Gbps TSON), high QoS, as well as hitless switch-over.
[Show abstract][Hide abstract] ABSTRACT: The paper presents the architecture, implementation and evaluation of the flexible and finely granular Time Shared Optical Network (TSON) metro node. It focuses on the FPGA-based Layer 2 TSON metro node system. The experimentally measured results show exceptional performance of up to 8.68Gbps throughput per 10Gbps port, 95.38% of theoretical maximum throughput, latency of less than 160μsec and jitter of less than 25μsec. The TSON topology agnostic node/network also delivers differentiated QoS latency levels yet always guaranteed (contention-free) by deploying diverse time-slice allocation schemes.
[Show abstract][Hide abstract] ABSTRACT: Network operators want to deliver multiple services to the end customers. This leads to the need of efficient transport of data using optical network technologies. OBS is a promising technology for metro networks, where the operator can locate their servers to provide services such as video, backup or PC virtualization. These services are competing for shared network bandwidth when running in parallel. This work develops an FPGA-based access edge node, which operates with multiple QoS applications. This paper describes the architecture of the design as well as the behaviour of the implemented solution.
[Show abstract][Hide abstract] ABSTRACT: Fast lightpath restoration becomes particularly challenging in all-optical networks. First, the optical transparency complicates failure localization and isolation procedures, as loss of light alarms stemming from a failure propagate downstream from the failure point. Besides, such a transparency implies that optical signals must traverse relatively long distances without electrical regeneration. In view of this, backup path computations must also account for all degradations introduced in the physical end-to-end path, thus ensuring their feasibility. Looking toward the optical core networks of the future, the EU DICONET Project has worked on cross-layer solutions to enhance network control and management with the impairment-awareness needed to govern the underlying optical layer. This includes a network planning and operation tool (NPOT) that implements impairment-aware routing and wavelength assignment algorithms, along with a failure localization mechanism. This paper reports the experimental demonstration of a dynamic impairment-aware restoration scheme that benefits from enhanced NPOT features for fast lightpath restoration. To this end, a prioritized scheduler to provide differentiated resilience support, the implementation of the quality of transmission estimator module on field programmable gate array hardware, and a fast resource pre-reservation protocol are presented in this work. The performance of the proposed impairment-aware lightpath restoration scheme has been evaluated experimentally on a 14-node all-optical network test-bed, showing average restoration times of 1.16 and 1.64 s for high and low priority traffic classes, respectively.
Full-text · Article · May 2012 · Journal of Optical Communications and Networking
[Show abstract][Hide abstract] ABSTRACT: A novel Software/Hardware defIned NEtwork
(SHINE) framework for future optical network is proposed in
this paper. An FPGA based SHINE adaptive network element
(SANE) carrying time shared optical network (TSON) service
and 10G Ethernet service is implemented. A cross-platform
C++/Qt based SHINE IDE incorporating fine/coarse granular
instruction set is developed to simply compose node/network
manually or automatically. Five types of SHINE working flows,
i.e. node on demand, network on demand, node self-adaptation,
node generation, and network generation, are depicted, then
demonstrated and selectively evaluated. Particularly, a hitless
switch-over between sub-wavelength service (TSON) and low
latency fat pipe service (10G Ethernet) (network on demand),
and a receiver automatically detects transmitter?s change (i.e.
switch-over from TSON to Ethernet), then adjusts itself (node
self-adaption), are highlighted.
[Show abstract][Hide abstract] ABSTRACT: The paper presents the architecture, implementation and evaluation of the flexible and finely granular Time Shared Optical Network metro node (TSON). The results show exceptional performance, throughput 95.38% of theoretical maximum, latency less than 160µsec and jitter less than 25µsec.
[Show abstract][Hide abstract] ABSTRACT: The paper presents a novel network on-and-off chip approach for highly efficient and transparent intra-datacenter communications. The implemented FPGA-based network on-chip line card enables hitless adaptation between Ethernet and TSON, which is supported by a flexible network off-chip of AoD, demonstrating end-to-end high performance results.
[Show abstract][Hide abstract] ABSTRACT: This paper presents the Time Shared Optical Network (TSON) as metro mesh network architecture for guaranteed, statistically-multiplexed services. TSON proposes a flexible and tunable time-wavelength assignment along with one-way tree-based reservation and node architecture. It delivers guaranteed sub-wavelength and multi-granular network services without wavelength conversion, time-slice interchange and optical buffering. Simulation results demonstrate high network utilization, fast service delivery, and low end-to-end delay on a contention-free sub-wavelength optical transport network. In addition, implementation complexity in terms of Layer 2 aggregation, grooming and optical switching has been evaluated.
[Show abstract][Hide abstract] ABSTRACT: In this letter, a hardware accelerated GMPLS based and impairment-aware control plane suitable for optical networks with concurrent lightpath requests support is proposed and evaluated. It outperforms the software version by 80 times in the order of sub-seconds. The high acceleration rate, simultaneous requests support, scalability and low computation time variance are the key features of this tool.
[Show abstract][Hide abstract] ABSTRACT: An enhanced version of hardware accelerated QoT estimation tool in impairment-aware optical network to support Cloud Computing is designed and evaluated against the different number of lightpaths and wavelengths per link. It outperforms the software version by 28 times in the order of millisecond for a single computation, and up to 3 times more for multiple computations. It sharply decreases the lightpath assessment time and accelerates lightpath provisioning with the objective of making it suitable for incorporation in a dynamic and realtime environment. It enables Cloud Computing based timing critical applications which need fast response and low delay.
[Show abstract][Hide abstract] ABSTRACT: This paper presents a novel service-oriented network architecture to bridge the informational gap between user applications and optical networks providing technology-agnostic multigranular optical network services for clouds. A mediation layer (service plane) between user applications and network control is proposed to facilitate a mapping process between user application requests and the network services. At the network level, a multigranular optical network (MGON) is proposed and implemented to support dynamic wavelength and subwavelength granularities with different transport formats [optical burst switched (OBS), optical burst transport (OBT)], reservation protocols (one-way, two-way), and different quality-of-service (QoS) levels per service type. The service-oriented multigranular optical network has been designed, implemented, and demonstrated on an experimental testbed. The testbed consists of service and network resource provisioning, service abstraction, and network resource virtualization. The service-to-network interoperation is provided by means of a gateway that maps service requests to technology-specific parameters and a common signaling channel for both service and network resource provisioning.
No preview · Article · Nov 2010 · Journal of Optical Communications and Networking
[Show abstract][Hide abstract] ABSTRACT: This paper presents a hybrid optical test-bed controlled by a hardware-accelerated control plane capable of dynamically provisioning the most suitable route according to the requirements of the client technology and the physical characteristics of the network.
[Show abstract][Hide abstract] ABSTRACT: This paper proposes an innovative self-managed optical network architecture for heterogenous transparent optical networks. A self-optimized dynamic network testbed that comprises multiple multi bit-rate ligthpaths on a mesh topology that utilizes a dark fiber link has been implemented and evaluated.
[Show abstract][Hide abstract] ABSTRACT: An enhanced version of hardware accelerated QoT estimation tool in impairment-aware optical network is demonstrated and evaluated against the different number of lightpaths and wavelengths per link. It outperforms the software version by 28 times in the order of millisecond.
[Show abstract][Hide abstract] ABSTRACT: This paper presents a hybrid optical test-bed controlled by a hardware-accelerated control plane capable of dynamically provisioning the most suitable route according to the requirements of the client technology and the physical characteristics of the network. Peer Reviewed Postprint (published version)
[Show abstract][Hide abstract] ABSTRACT: A fundamental issue in all-optical switching is to offer efficient and cost-effective transport services for a wide range of bandwidth granularities. This paper presents multi-granular optical cross-connect (MG-OXC) architectures that combine slow (ms regime) and fast (ns regime) switch elements, in order to support optical circuit switching (OCS), optical burst switching (OBS), and even optical packet switching (OPS). The MG-OXC architectures are designed to provide a cost-effective approach, while offering the flexibility and reconfigurability to deal with dynamic requirements of different applications. All proposed MG-OXC designs are analyzed and compared in terms of dimensionality, flexibility/reconfigurability, and scalability. Furthermore, node level simulations are conducted to evaluate the performance of MG-OXCs under different traffic regimes. Finally, the feasibility of the proposed architectures is demonstrated on an application-aware, multi-bit-rate (10 and 40 Gbps), end-to-end OBS testbed.
Full-text · Article · Jul 2009 · Journal of Optical Communications and Networking
[Show abstract][Hide abstract] ABSTRACT: This article presents a novel application-aware network architecture for evolving and emerging IT services and applications. It proposes to enrich an optical burst switching network with a session control layer that can close the gap between application requests and network control. The session control layer is implemented using the session initiation protocol, giving birth to what is called a SIP-OBS architecture. The article discusses the important added value of this architecture, and shows that it may support a number of end-to-end resource discovery and reservation strategies (for both network and non-network resources). Finally, it presents a testbed implementation where this approach was experimentally validated.
No preview · Article · Jun 2009 · IEEE Communications Magazine
[Show abstract][Hide abstract] ABSTRACT: This paper describes the design of a dynamic state-space feedback gain scheduling controller for OBS burst scheduling. It can meet upper layer application requirements, while protecting the network from incurring severe burst loss and end-to-end delay. Through the use of gain scheduling to provide dynamic shifting between different models, the controller provides more accurate modelling than a single linear system approximation. Moreover it employs a MIMO system to consider the interaction between the scheduler parameters, i.e. TimeOut and MaxLenght in order to provide more accurate modelling than a multiple SISO system approximation. Finally the proposed controller model is verified by the use of OPNET simulation.
[Show abstract][Hide abstract] ABSTRACT: This paper presents a service-oriented multi-granular multi-format network demonstrator. Service-oriented wavelength and sub-wavelength network connection establishment is being demonstrated by utilising SOON-JIT protocols to support VoD HD and Quad-HD multi-media applications. (C) 2005 Optical Society of America