Takefumi Oguma

State-Based Algorithm for Power Stability Control in Transparent WDM Networks

This paper analyzes power fluctuation caused by interaction of fiber cut, add/drop operation, EDFA transients and ROADM attenuation adjustment in WDM networks. A state-based power control algorithm is proposed and tested in our simulation system.

Mechanical Behavior of a Silicon Micro-Optical Attenuator

Two kinds of Micro-Electro-Mechanical-System (MEMS) mirrors, supported by cantilever or torsion beams, were designed and fabricated Their mechanical response to electrostatic force was theoretically analyzed according to the balance of the electrostatic moment with the spring torque. The measured capacitance change agrees well with the calculated one. These micro-mirrors are expected to be applied to the attenuators for use in a wavelength-division-multiplexed (WDM) transport systems.

Enhancing protection performance by effectively using spectral slots of impairment-aware elastic optical networks [invited]

The challenge of using spectral bandwidth effectively considering optical impairments in elastic optical networks is studied. The protection performance is enhanced by improving the spectral efficiencies of the networks. Novel optical filter configuration, signal equalization, and spectral bandwidth assignment technologies are proposed to minimize the use of the guardband while taking the passband narrowing effect into consideration. It is verified that spectral slots are effectively used with actual network topology models.

Reliability enhancement by a joint optimization of elastic optical path allocation methods

Increasing the number of lightpaths for protection accommodated onto an optical fibre network improves reliability of communication services. For this purpose, more optical paths can be accommodated by a spectrally efficient path assignment algorithm, while keeping spectral efficiency of the optical path higher. In this paper, we propose a joint optimization of elastic optical path allocation methods. The simulation results show that the joint optimization algorithm achieves reliability enhancement.