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We developed ODU-XC, CDC-ROADM, and silicon photonics switch, and built an eight-node network capable of 90Tbps based on NSI-CS standard protocol. Its energy consumption was orders of magnitude lower than that achievable with IP routers.
We develop a 270 × 270 optical cross-connect that utilizes our cascaded arrayed waveguide-grating (AWG) configuration. The system is set in a 370 × 230 × 120 mm3 box and its feasibility is confirmed by transmission experiments.
The wavelength tunable filter will play a key role in realizing C/D/C add/drop functions in ROADMs. We fabricate a novel tunable filter for 192 optical channels on a PLC chip. Transmission experiments verify its optical characteristics.
We propose a dynamic control algorithm for coarse granular optical routing networks that provide wavelength services. Numerical experiments elucidate its significant switch scale reduction at nodes while keeping fiber increment to marginal level.
In this paper, a fast wavelength switching protocol to deal with the RTT drift problem in WDM/TDM-EPON system is proposed. Estimated process time revealed one sixth reduction of the switching time can be available.
Future optical networks need flexible and large scale optical cross-connect systems. Challenges in and recent advances of system development are presented.
We demonstrate efficient Colorless/Directionless/Contentionless add/drop configuration utilizing newly proposed tunable filters to develop flexible OXCs/ROADMs. The filter is compactly fabricated on a 15×70 mm2 PLC chip and the performance was verified.
We analyzed three different kinds of add/drop ratio restriction schemes for reducing OXC hardware scale and network resource requirements. Numerical experiments clarify the degree of effectiveness of each restriction.
This paper proposes a novel optical switch architecture that attains colorless/directionless/contentionless (C/D/C) capabilities. The proposed architecture combines simple switches and AWGs, and is easy to implement. We experimentally confirm its technical feasibility in an experiment.
We propose a novel network architecture that exploits coarse granular routing while add/drop operations are done at wavelength granularity. Node architecture and the network design algorithm are introduced. Numerical results verify its cost efficacy.
We demonstrate the importance of considering physical impairments in waveband-based optical networks. We propose and evaluate an Impairment-Aware waveband-routing and waveband-assignment (IA-RWBA) algorithm achieving significant improvement in both impairment satisfaction rate and total network cost.
The first practical terabit-scale hierarchical optical cross-connect system is realized by employing silica-based planar lightwave circuit devices. The system is scalable to 320 line cross connects + 160 client cross connects, and fully implemented equipment would require a 16-U-high chassis and only a 350-W power consumption. The potential of node cascadability is discussed and experimentally confirmed...
A flexible and compact hierarchical optical cross-connect (HOXC) node that considers a practical waveband add/drop restriction is proposed. We introduce a prototype HOXC system and verify its technical feasibility and transmission characteristics.
Compact and practical 4-degree optical cross-connect equipment with add/drop ports is realized for use in connecting ROADM ring networks. Eight 40-channel AWGs and forty 4×4 matrix switches are integrated in a 2-U high chassis.
We develop network design algorithms that consider constraints on the number of added/dropped optical paths at nodes in terms of wavelength and of fiber. The strategy is demonstrated to significantly reduce node hardware scale.
Hierarchical optical cross-connect architectures based on dedicated add/drop switches for terminating traffic is proposed. The architecture can significantly reduce switch scale for implementing colorless/directionless/contentionless capabilities.
We propose a 2-stage ILP-based design algorithm for hybrid-HOXCs based optical networks. The hybrid-HOXC consists of an optical waveband cross-connect and an electrical cross-connect which grooms only wavelength paths. Its effectiveness is evaluated through numerical experiments. Impact of electrical/optical port cost ratio on the total network cost is also investigated.
We propose a simple node architecture that is used to concatenate two ROADM rings. The proposed architecture employs variable filters that can effectively handle classified node input signals to realize the desired routing operations. Finally, we developed a prototype system and performed transmission experiments. The technical feasibility has been confirmes.
We introduce a compact matrix-switch-based hierarchical optical path cross-connect prototype system that exploits integrated colorless waveband multi/demultiplexers. Its performance ensures cost-effective networks can be created.
We propose a novel node architecture and a design algorithm for hierarchical optical path networks that make the best use of waveband add/drop ratio limitation. Numerical results verify significant reductions in network cost and node switch scale.
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