Vol.4 No.2 2011

Research paper : Demonstration of optical communication network for ultra high-definition image transmission (J. Kurumida et al.)−110−Synthesiology - English edition Vol.4 No.2 (2011) reasons for this. One is to check that the communication is possible by compensating all the nonlinear responses from the field optical fiber, and the other is to check whether the different networks configured by different elements can be mutually connected. Also, some modifications are made to the entire system to C) achieve low power consumption.Above is the framework for the scenario of the demo experiment. The dynamic optical path network will be built based on this framework. One factor will be whether it is possible to achieve the high-speed high-capacity communication infrastructure geared for the near future by merely integrating and combining the aforementioned items. The aforementioned perspective mainly looks at the hardware, and that alone will not enable correct synthesis of the network. It is necessary to design the software and firmware to match the hardware. Figure 2 shows the configuration elements of the demo experiment. In the configuration elements, there are the following limiting conditions: to use the field optical fiber, to use the communication elemental technologies that we developed, and to add the resource management and control. Moreover there are two aspects of software and hardware for these conditions, and a consideration for a comprehensive configuration is necessary to conduct the demo experiment effectively.The elemental technologies will be explained in the next chapter in more detail, but extra scenarios were considered in actually executing the demo. Although it might not be used in the demonstration, the network extendibility was added in the elemental technology as a backup in preparation of the worst-case situation. Such preparation is done not only in demonstration experiment, but is done in actual communication systems. Real systems are designed to be reconfigurable according to the status of the problem or have implemented functions that allow alternative functions. Considering the above, we created a scenario to demonstrate the mixed bitrates, mutual connection of heterogeneous networks, and provision of the HD video service according to requests.4 Elemental technologiesThe elemental technologies of the optical network demo experiment can be broken down into five parts. They are: network resource management, communication line as a medium through which the information is transmitted, nodes or equipment placed at their terminals, terminal device for transmitting/receiving, and the actual information (contents) that flow through the lines and devices. Table 1 shows the summary of the elemental technologies. In this chapter, the elemental technologies of configuration will be described according to Table 1, and the reasons for selecting them will be clarified.4.1 Resource management4.1.1 Optical path network (NTT and AIST)The Network Photonics Research Center, AIST has engaged in the R&D of optical path network, and developed the technology to optimize the optical fiber dispersion and optical intensity of the communication path, to eliminate the effect of the various optical switches that are used to switch the communication path[2]. In this demonstration, the PLC type optical switchTerm 1 (Table 1(e)) was used for the node, which was connected by the optical fiber patch cord several meters long to form the optical path network.The network and storage resource manager in the optical path network was realized by the collaboration between the Nippon Telegraph and Telephone (NTT) Corporation and the Information Technology Research Institute, AIST. The network resource manager was installed to manage the optical path and the resource manager that managed the reservation status of the performance-assured storage, and optimal server selection and optical path were set for the video on demand from the viewer[3].When the reservation from the viewer was received and the reservation time arrived, the optical path opened to start the content Fig. 2 Configuration of the demonstration experimentTable 1. Configuration element of the demonstration experimentElemental technologiesHardwareSoftwareResource management and controlConfiguration using the field optical fiberNetwork configured by coexistence of the communication elemental technologiesdemonstration experiment[2][3][4][6][5][7][8][10][11]-[13][14]Configuration elementsResource managementOptical path networkOptical Packet and Circuit Integrated NetworkR&D testbed networkCommercial optical fiber line (Akihabara ‒ Otemachi)PLC optical switchSilicon photonics switchCurrent-injection-type silicon-based high-speed optical switchPower-saving next-generation ROADMHigh-speed wavelength tunable laserOptical fiber amplifier (EDFA)Parametric arbitrary wavelength converterHigh-speed autonomous-control tunable dispersionSuper Hi-Vision transceiverContents achieve serverVideo delivery serverDisplay (monitor)Super Hi-Vision imageHi-Vision videoNTT / AISTNICTJGN2plus(NICT)‒‒Commercially availableCommercially availableCommercially availableGeneral-useGeneral-useAISTFujitsu Laboratories Ltd.NECTrimatiz Ltd.‒Furukawa Electric Co., Ltd./ AISTFurukawa Electric Co., Ltd./ AISTNHK‒‒‒NHKAISTCommunication lineNode equipment and deviceTerminalContentsName of technologiesCollaborating organizationsReferencesNotes(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)(m)(n)(o)(p)


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