Yasuo Oeda
The Furukawa Electric Co., Ltd.
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Featured researches published by Yasuo Oeda.
Optoelectronics '99 - Integrated Optoelectronic Devices | 1999
Tsuyoshi Fujimoto; Yumi Yamada; Yoshikazu Yamada; Atsushi Okubo; Yasuo Oeda; Kiyofumi Muro
High power InGaAs/AlGaAs laser diodes with decoupled confinement heterostructure (DCH) have been developed. Almost Al-free waveguide and cladding layers were realized in 980 nm DCH laser diodes without degrading temperature characteristics. The extremely low electrical and thermal resistances allowed high power and efficient operation. The maximum CW output power as high as 9.5 W was obtained with 100-micrometer-aperture broad area. DCH laser diode. The maximum efficiency was 55% at 2.5 W. The series resistance of 1.8-mm long cavity was 0.04(Omega) and internal loss was 1.5 cm-1. The characteristic temperature (T0) was 155 K. The substantially Al-free DCH structure enables easy fabrication of various index guided laser diodes. We have developed two types of real index guided laser diodes, buried- ridge and self-aligned structure. Buried-ridge laser diode presented 1.3 W maximum CW output power and 500 mW single mode operation. Self-aligned structure laser diodes showed 1.4 W CW output power and 700 mW single mode operation with better reproducibility.
High-power lasers and applications | 1998
Yoshikazu Yamada; Atsushi Okubo; Yasuo Oeda; Yumi Yamada; Tsuyoshi Fujimoto; Kiyofumi Muro
In order to overcome catastrophic optical damage, decoupled confinement heterostructure (DCH) featuring a broadened waveguide and thin carrier block layers have been developed. Due to decoupling of carrier and optical confinement, a DCH laser can be designed more flexibly than a conventional separated confinement heterostructure laser, i.e., laser diodes can be designed with a variety of gain coupling factor (Gamma) (perpendicular), quantum-well number NW, keeping the beam divergence angle constant.
conference on lasers and electro optics | 1999
Yumi Yamada; Tsuyoshi Fujimoto; A. Okubo; Yasuo Oeda; Kiyofumi Muro
Summary form only given. We have proposed the DCH structure for high power LDs. DCH, which stands for Decoupled Confinement Heterostructure, features a broadened waveguide and carrier blocking layer. The broad waveguide results in low Gamma and an ideal Gaussian shape optical mode. Providing carrier blocking layers makes it possible to freely design the optical guide system independently of the carrier confinement. The brightness that was achieved in the GaAs/AlGaAs LD was about twice as high as the market standard level. In this paper we introduce the potential of the InGaAs/AlGaAs-DCH structure for higher brightness LDs. Our concept is to realize the high brightness LD by using AlGaAs to obtain a high quality crystal and at the same time we adopt the DCH structure to reduce the resistance. This concept performs most effectively on InGaAs/AlGaAs LD from the perspective of material characteristics.
conference on lasers and electro optics | 1998
Yasuo Oeda; Tsuyoshi Fujimoto; Yumi Yamada; H. Shibuya; Kiyofumi Muro
The authors demonstrated high-power cw operation and long lifetimes of 0.8-/spl mu/m-band GaAs-AlGaAs DCH laser diodes.
Archive | 1998
Kouichi Igarashi; Yasuo Oeda; Kiyofumi Muro
Archive | 2000
Satoru Okada; Tsuyoshi Fujimoto; Yasuo Oeda
Archive | 2004
Yasuo Oeda; Kiyofumi Muro; Michio Okubo
Archive | 2004
Naoki Hayamizu; Jun Miyokawa; Yuichiro Irie; Shuichi Tanaka; Yasuo Oeda; Tsuyoshi Fujimoto; Yoshikazu Ikegami
Optical Amplifiers and Their Applications (2003), paper TuB4 | 2003
Naoki Hayamizu; Jun Miyokawa; Hideaki Murata; Kevin Nishikata; Yasuo Oeda; Tsuyoshi Fujimoto; Yoshikazu Ikegami
Archive | 1998
Kouichi Igarashi; Yasuo Oeda; Kiyofumi Muro