Masaki Shiraiwa

Dynamic Openflow-Controlled Optical Packet Switching Network

This paper presents and experimentally demonstrates the generalized architecture of Openflow-controlled optical packet switching (OPS) network. Openflow control is enabled by introducing the Openflow/OPS agent into the OPS network, which realizes the Openflow protocol translation and message exchange between the Openflow control plane and the underlying OPS nodes. With software-defined networking (SDN) and Openflow technique, the complex control functions of the conventional OPS network can be offloaded into a centralized and flexible control plane, while promoted control and operations can be provided due to centralized coordination of network resources. Furthermore, a contention-aware routing/rerouting strategy as well as a fast network adjustment mechanism is proposed and demonstrated for the first time as advanced Openflow control to route traffic and handle the network dynamics. With centralized SDN/Openflow control, the OPS network has the potential to have better resource utilization and enhanced network resilience at lower cost and less node complexity. Our work will accelerate the development of both OPS and SDN evolution.

Demonstration of Adaptive SDN Orchestration: A Real-Time Congestion-Aware Services Provisioning Over OFDM-Based 400G OPS and Flexi-WDM OCS

In this Paper, we experimentally demonstrate highly flexible and intelligent interdomain coordinated actions based on adaptive software-defined networking (SDN) orchestration. An advanced multidomain multitechnology testbed is implemented, which consists of a 400-Gb/s variable capacity optical packet switching domain and a Tb/s-class flexi-grid wavelength division multiplexed optical circuit switching domain. The SDN-controllable transponders and the extended transport applications programming interface enable the congestion-aware provisioning of end-to-end real-time services. At the data plane level, different transponders based on orthogonal frequency division multiplexing are employed for inter/intradomain links in order to adaptively provision services with fine granularity. For adaptation, SDN-capable domain-specific optical performance monitors are also introduced. In the control plane, the applications based network operations architecture has been extended and addressed as an adaptive SDN orchestrator.

High-Speed Wavelength Resource Reconfiguration System Concurrently Establishing/Removing Multiwavelength Signals

We propose a novel wavelength resource reconfiguration system with a wavelength selective switch (WSS) and our unique burst-mode erbium-doped fiber amplifier (BM-EDFA) for dynamic and agile new-generation optical networks such as an elastic optical network. The system can concurrently establish or remove multiwavelength channels, while preserving the system stability. In a conventional reconfiguration system, the processing time is increased in proportion to the number of the reconfigured wavelength channels because each wavelength channel is sequentially established or removed. On the other hand, in the proposed system, the multiwavelength channels would be simultaneously established or removed. Therefore, in principle, the processing time for reconfiguration of multiwavelength channels can be 1/(the number of the reconfigured channels) compared to the conventional system with sequential processing. In addition, the system can provide a further reduction effect of the processing time since the adjustment of variable optical attenuators of the WSS is unnecessary after establishing or removing multiwavelength channels. We had demonstrated a proof of concept using a reconfiguration system for the first time. The system employing flexible-grid WSSs and a BM-EDFA showed that the total processing time could be more than 100 s shorter in the case of removing four-wavelength channels with the high-quality data transmission.

Control orchestration protocol: Unified transport API for distributed cloud and network orchestration

In the context of the fifth generation of mobile technology (5G), multiple technologies will converge into a unified end-to-end system. For this purpose, software defined networking (SDN) is proposed, as the control paradigm will integrate all network segments and heterogeneous optical and wireless network technologies together with massive storage and computing infrastructures. The control orchestration protocol is presented as a unified transport application programming interface solution for joint cloud/network orchestration, allowing interworking of heterogeneous control planes to provide provisioning and recovery of quality of service (QoS)-aware end-to-end services. End-to-end QoS is guaranteed by provisioning and restoration schemes, which are proposed for optical circuit/packet switching restoration by means of signal monitoring and adaptive modulation and adaptive route control, respectively. The proposed solution is experimentally demonstrated in an international multi-partner test bed, which consists of a multi-domain transport network comprising optical circuit switching and optical packet switching domains controlled by SDN/OpenFlow and Generalized Multiprotocol Label Switching (GMPLS) control planes and a distributed cloud infrastructure. The results show the dynamic provisioning of IT and network resources and recovery capabilities of the architecture.

Smooth Quick-in and Fade-out Operations-enabled Emergency Optical Networks for Disaster Recovery

We demonstrate a three-stage transition scenario of emergency optical networks in disaster recovery. The proposal enables cost-efficient quick-coupling of surviving resources from different networks to build emergency optical networks and smooth network-decoupling after recovery.

Demonstration of dynamic congestion control in optical packet switching network employing rate-adaptive transmitter and receiver

We experimentally demonstrate dynamic congestion control in an optical packet switching network employing an optical packet counter for traffic flow diagnosis and a rate-adaptive transmitter and receiver to reduce packet loss ratio while preserving the transmission capacity.

Resilient optical network technologies for catastrophic disasters [invited]

A strategy to strengthen the resiliency of optical networks against catastrophic disasters such as megaquakes or tsunamis is introduced. Two important aspects are endurance against damage in broad-area networks and the quick recovery of optical networks in devastated areas. In order to realize endurance in broad-area networks, optical packet switching integrated with circuit switching is proposed to mitigate congestion. For quick recovery of optical networks in devastated areas, emergency optical networks and hierarchical addressing are introduced.

Resilient optical network technologies for catastrophic disasters

A strategy is introduced for endurance and quick recovery of devastated optical networks in order to strengthen their resiliency. As key technologies, optical packet switching integrated with circuit switching and emergency optical networks were adopted.

Experimental Demonstration of Disaggregated Emergency Optical System for Quick Disaster Recovery

Disaggregation and white-box approaches are useful in expediting disaster recovery of optical transport networks. When an optical network system is damaged by a large disaster, the damaged devices can be replaced by the disaggregated functional devices, while disregarding vendor boundaries. In the light of the disaggregation and white-box approaches, we are developing a prototype of disaggregated portable emergency optical system (EOS) for early and low-cost postdisaster recovery. The EOS is customizable, and different functions can be selected to meet the different requirements in disaster recovery. In addition to replacing the damaged functions of the original optical system with an EOS, we introduce two new disaggregated functions into the EOS for postdisaster recovery. First, we introduce an optical supervisory channel handshake scheme to aid the interconnection of the surviving optical resources. Second, we introduce a scheme to achieve the quick recovery of the damaged control plane with the surviving or first restored wireless access capability. This is highly desired not only for emergency network control, but also for the quick collection of the network damage information. These two new functions have been implemented into the EOS prototype. We experimentally demonstrated the network recovery of the data-plane and the control-plane with the EOS.

Concurrently establishing and removing multi-wavelength channels reconfiguration system: Implementation for a dynamic and agile next-generation optical switching network

We propose a novel wavelength resource reconfiguration system for a dynamic and agile new-generation optical switching network such as a high-speed elastic optical network. The system can remove the wavelength channels in time of 1 / (the number of the channels multiplied by 3) compared with conventional method. A proof of concept employing flexible-grid wavelength selective switches and our unique technology burst-mode erbium-doped fiber amplifier demonstration achieved 1 / 12 time in case of removing four-wavelength channels with the high-quality data transmission.