Takeshi Kitatani

Title: Innovations of Takeshi Kitatani in Semiconductor Technology

Introduction

Takeshi Kitatani is a prominent inventor based in Hachioji, Japan. He has made significant contributions to the field of semiconductor technology, particularly in the development of advanced laser systems. With a total of 3 patents to his name, Kitatani's work has paved the way for high-speed optical communication systems.

Latest Patents

Kitatani's latest patents include a semiconductor laser, a ray module utilizing the same, and a ray communication system. His semiconductor laser is designed to emit light perpendicular to the substrate crystal. This innovative design incorporates an active layer for generating light, a cavity structure that sandwiches the active layer with reflecting mirrors, and a regrown semiconductor layer that enhances performance. The configuration effectively eliminates contamination deposits on the regrown interface through delta-doping, resulting in reduced costs and device resistance of 50 Ω or less. This advancement leads to the creation of an edge-emitting laser (VCSEL) capable of achieving optical module speeds exceeding 10 Gb/s.

Another notable patent involves vertical cavity surface emitting lasers and optical modules. This surface emitting laser device features an active region for light generation and a current confinement region that enhances the device's performance. The layered structure allows for the formation of 2-dimensional carriers, significantly reducing device resistance and enabling high-speed optical modules that operate at speeds of 10 Gb/s or more.

Career Highlights

Takeshi Kitatani is currently employed at Hitachi, Ltd., where he continues to innovate in the semiconductor field. His work has been instrumental in advancing optical communication technologies, making significant impacts on the industry.

Collaborations

Kitatani has collaborated with notable colleagues such as Masahiko Kondow and Toshiaki Tanaka. Their combined expertise has contributed to the successful development of cutting-edge technologies in semiconductor lasers.

Conclusion

Takeshi Kitatani's contributions to semiconductor technology, particularly in laser systems, highlight his role as a leading inventor in the field. His innovative patents and collaborations continue to influence advancements in high-speed optical communication.