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High reliability, high transmission speed and low power consumption laser diodes are required for optical interconnect. We have developed 1060 nm Vertical Cavity Surface Emitting Lasers (VCSELs) with InGaAs/GaAs strained quantum wells, oxide-confined and double intracavity structures for the requirement. In this paper, an extremely long term aging test close to the actual operating temperature was...
VCSEL performance will be reviewed. A careful design of cavity structure, as well as precise control in the epitaxial growth enables us to achieve a record power conversion efficiency of 62% in the 1060nm VCSELs.
The InAlAs avalanche photodiodes that employ a guardring-free structure demonstrate record high reliability of over 10000 hours at a high temperature of 200degC with no degradation in the surfaced pn-junction.
Using fMRI in young and aged human brains, we evaluated the link between masticatory function and senile processes. Chewing resulted in a bilateral increase in blood oxygenation level-dependent (BOLD) signals in the sensorimotor cortex, supplementary motor area, insula, thalamus, amygdala, and cerebellum in both age groups, but the increase was smaller in the first three regions and higher in the...
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