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969 results on '"Koyama F"'

1. Intensity noise in ultra-high frequency modulated semiconductor laser with strong feedback and its influence on noise figure of RoF links

Author

Ahmed M., Bakry A., Altuwirqi R., Alghamdi M. S., and Koyama F.

Subjects
modulation, intensity noise, optical feedback, rof link, semiconductor laser, Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
Abstract

We characterize the intensity noise associated with the ultra-high frequency direct modulation of semiconductor lasers under strong optical feedback over a millimeter-wave frequency passband between 54.5 and 56.5 GHz. Enhancement of the modulation response over this millimeter wave band due to optical feedback is clearly shown by time-delay rate equation analysis fully involving the strong optical feedback effect. The contribution of the relative intensity noise of the laser to the noise figure of an ultra-high speed radio over fiber link is evaluated. We show that subjecting the laser diode to strong feedback improves the noise figure of a 55.8-GHz radio over fiber link nearly by 20 dB in the regime of small-signal modulation and 10 dB under large-signal modulation.

Published
2013
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11. K-factor of 1.3 mum-range GalnNAsSb/GaAs VCSEL

Author

International Conference on Optical Internet (3rd : 2004 : Kanagawa, Japan), Ariga, M, Arai, M, Setiagung, C, Ikenag, Y, Kageyama, T, Kumada, K, Iwai, N, Hama, T, Shimizu, H, Nishikata, K, Kasukawa, A, and Koyama, F

Published
2004

15. Reduced induction of human β‐defensins is involved in the pathological mechanism of cutaneous adverse effects caused by epidermal growth factor receptor monoclonal antibodies

Author

Ommori, R., primary, Nakamura, Y., additional, Miyagawa, F., additional, Shobatake, C., additional, Ogawa, K., additional, Koyama, F., additional, Sho, M., additional, Ota, I., additional, Kitahara, T., additional, Hontsu, S., additional, Muro, S., additional, and Asada, H., additional

Published
2020
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16. Marmaray project

Author

Tanal, Vahan, primary, Sakaeda, Hideki, additional, Guler, Isikhan, additional, Koyama, F, additional, and Lykke, Steen, additional

Published
2005
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21. Low temperature growth of GaInNAs/GaAs quantum wells by metalorganic chemical vapor deposition using tertiarybutylarsine

Author

Pan, Z., Miyamoto, T., Schlenker, D., Sato, S., Koyama, F., and Iga, K.

Subjects
Chemical vapor deposition -- Usage, Quantum wells -- Research, Organometallic compounds -- Research, Fiber optics -- Research, Physics
Abstract

A study was conducted to analyze the low temperature growth of highly strained GaInNAs/GaAs quantum wells by low-pressure metalorganic chemical vapor deposition using dimethylhydrazine and tertiarybutylarsine. A vertical low-pressure system was utilized to carry out the study. Results indicated differences in the incorporation of high levels of In in the strained GaInNAs layers as a function of temperature.

Published
1998

48. Polarization Characteristics of InGaAs/GaAs Vertical Cavity Surface Emitting Lasers Grown on GaAs(311)A-Oriented Substrates

Author

Takahashi, M., Pablo Vaccaro, Fujita, K., Watanabe, T., Mukaihara, T., Koyama, F., and Iga, K.

Abstract

The vertical cavity surface emitting laser (VCSEL) is recognized as one important device in applications such as optical interconnects, optical communications and so on. Most of VCSELs have been fabricated on (100)-oriented substrates, and exhibit linear polarization. But usually it is unstable due to the small polarization selectivity [1]. The polarization control is, therefore, an important subject for polarization-sensitive applications. One of the control methods is to use the effect of optical anisotropy of strained quantum wells (QWs) grown on (n11)-oriented substrates [2]. We present here the first result on the stable polarization characteristics of a (311)A-oriented InGaAs/GaAs VCSEL operated at room temperature

Published
1996

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