Data centre power consumption can be reduced by switching off servers during low load. However, excess switching is wasteful. This paper reviews online algorithms for optimizing this tradeoff, including the benefits of shifting load between geographically distant data centres. These algorithms can also adjust a link's number of parallel lightpaths.
This paper clarifies roadmap of applications for IoT (Internet of Things) and technical requirements for its communication. Then, it proposes network evolution scenarios using combination of optical and wireless networks to support IoT. Finally, it also proposes technical issues to realize these scenarios and their solutions.
Virtualization in optical networks and its enabling technologies are presented from the viewpoints of elastic optical networking and sliceable equipment as a key to implementing increased agility and flexibility into the optical domain.
An inter-operability test on 100G DP-QPSK LH optical modules from different vendors is conducted. We successfully demonstrate the interoperability of 100G DP-QPSK modules in line-side test with error free operation. We also demonstrate end to end error free operation including the transfer of 100GbE client signal with 100G OTN framer.
We propose Software Defined Transport Network architecture which can control transport network freely. In this paper, we clarified some technical issues related multi-domain SDTN such as resource definition, network control interface, route selection, and monitoring. Finally, we constructed global-scale experimental network and confirmed the feasibility of the issues.
We investigate the effects of LiNbO 3 modulator chirp on the performances of optical multilevel signals detected by a digital coherent receiver and evaluate the optical filtering tolerances of multilevel signals. The results show that return-to-zero (RZ) pulse carving is useful to prevent the performance deterioration caused by the modulator chirp.
This paper investigates the performance of non-split S-OSPF with hose model to examine the dependency on network topologies. We focus on three network parameters. Numerical results shows that the routing performance is improved when number of nodes and adjacency nodes are larger, while average distance between nodes has no effect.
Feasibility of making all directional graded index variations on a polynorbornene based planar lightwave circuit is demonstrated. Owing to the light confinement characteristic, all parallel-aligned 12 channels are capable of transmitting 12.5Gbps data with low crosstalk.
The increase of contents which are distributed on the Internet is bad for health of the Internet. All optical network and P2P must be the best way to solve this problem. We propose several improvements on OCS optimized P2P, BT-ON, in terms of the length of its optical wavelength path.
In this paper, we review our recent research activities on the investigation of the feasibility of using the optical fiber-based nonlinear signal processing technologies for all-optical UWB radio signal processing. It is shown that the optical fiber-based nonlinear signal processing technology can be also applied to IR-UWB-based fiber/wireless-transmission systems.
The founding concept of COIN began in 2001 to optimally handle the exploding Internet traffic by means of evolving optical network technologies, and leaded to a new international conference hosted annually in turn by Korea, Australia, Japan, and China. After 10 years, friendship and cooperation among our community have grown in full blossom by observing vertical convergence of optical network technology and broadband Internet services. However the true convergence together with many fascinating applications is yet to come.
We propose wavelength initialization technique which is automatically performed using WDM-PON light path. Compare with other techniques, the least space and the lowest cost are consumed for realizing. The initialization time of the worst case, for 32th channel, is below 1 second.
This paper tackles the Polarization Dependence of Gain (PDG) in distributed Raman amplifier (DRA) system with orthogonal polarization multiplexed pump lights. We show that polarization mode dispersion in transmission line degrades the orthogonality of pump lights and induces PDG. We propose a compact pump depolarizer to suppress PDG.
This paper presents a mathematical model for wavelength assignment to minimize number of wavelengths needed in wavelength reusable multi-carrier distributed (WRMD) wavelength-division-multiplexing (WDM) mesh networks. The result shows that reusing the carrier wavelength reduces the number of wavelengths needed WRMD-WDM networks.
We propose a misconnect detection method which is based on SOP modulation and uses a modulation frequency as an optical path identifier. A 1 Hz spaced identifier frequency assignment was experimentally confirmed without any signal degradation by using a Si-photonics based CDC-ROADM and a 100 Gbps PM-QPSK digital coherent transceiver.
In this paper, for the first time, we experimentally investigate OpenFlow-based reliable service provisioning and dynamic service differentiation in IP/DWDM multi-layer optical networks. All the solutions are experimentally demonstrated on a real testbed with both control and data planes, verifying their overall feasibility and efficiency, and quantitatively evaluating their performance.
We report a signal processing technique based on partial response (PR) equalization to enable high-speed and long-reach RSOA-based WDM-PON. Experiments are carried out to demonstrate 10 Gb/s transmission over 125 km and 20 Gb/s transmission over 30 km using a 1 GHz RSOA and the proposed equalizer design.
In this paper, we propose an independent and adaptive link rate control for a 1Gbps/10Gbps hybrid PON, where the low power consumption 1Gbps transceivers are maximally used even when incoming traffic reaches the given threshold. We show effectiveness of our proposed method in terms of energy efficiency through simulation experiments.
High power budget is desired for realizing high-split-ratio and long reach in a PON system. We describe recent optical amplifier technologies to achieve a high power budget in these systems.
This paper presents a technique to make large distributed key-value storage which works on multiple data center. In the technique, each physical server in the datacenters works as a node of an overlay network. Joining/leaving the overlay network makes inter-datacenter load-balancing and datamigration easy.
