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We fabricated high performance 1550 nm widely tunable lasers which are integrated 12-channel DFB laser array and SOA with buried-heterostructure configuration based on the AlGaInAs/InP system. We investigated the lasing performance at high temperature of the widely tunable laser. The output power as high as 90 mW at a temperature of 70 °C was achieved, which is the highest output power ever reported...
We have fabricated high performance 1550nm both solitary lasers and the 12-channel arrayed DFB/SOA integrated widely tunable lasers with buried-heterostructure configuration in the AlGaInAs/InP system. An output power of 100mW was obtained for tunable lasers at 20°C.
We carefully analyzed NF and output power depending on QW number and waveguide structure of MQW SOAs. The developed SOA with a NF of 3.7 dB can be used for a limiting or booster amplifier.
The basis of the e-learning system used in most educational institutions is a character representation by a web browser. This has caused a decrease in usability. It's user interface is not easy for beginners. Therefore, the user comes to have to study the manner of operation of the system before original study. This paper proposes the GI (Gesture Interface) as an operation method for e-learning system...
This paper proposes a bed environment where user can actively work in bedridden posture. The proposed bed environment is using a nursing bed as the base, and has an overhead lighting, a screen, and a projector. The environmental conditions, such as bed angle, table angle, and screen distance and angle, and the number of electric bulbs of lightings and its angle, were evaluated by performing questionnaire...
The optical absorption coefficient (alpha) for carbon-doped GaAs epitaxial layer by CBr4 with doping range from 1018 to 1020 cm-3 was measured for the first time. Obtained alphaGaAs:C was 2-times larger than alphaGaAs:Zn at 1300 nm.
Thermal lens effect on single-transverse-mode stability of proton-implanted photonic-crystal vertical-cavity surface-emitting lasers is studied. Theoretical and experimental demonstration of the trade-off between the single-mode stability and low loss. Single-mode stability with a smaller lattice constant is also discussed.
When we attend class, we frequently take notes. The method of taking note means writing much information as a paper record. However, we cannot write it down in the notebook if there is no visual feedback information. We propose a pen-based note-taking system, which is named the 'pen-talker' on the ultra mobile PCs for blind person. A blind novice user with acquired blindness is able to input Japanese...
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