Yasushi Sawada

Title: Innovations of Yasushi Sawada

Introduction

Yasushi Sawada is a prominent inventor based in Yokohama, Japan. He has made significant contributions to the field of optical networks and telecommunications. With a total of nine patents to his name, Sawada's work has had a considerable impact on the industry.

Latest Patents

One of his latest patents focuses on an optical network designed to create a medium-scale IP telecommunications network. This network is configured as a low-cost optical system that offers good reliability and expandability. The physical configuration includes a central node connected to eight local nodes in a ring formation. The logical setup resembles a star configuration, with all traffic passing through the central node. Local nodes are connected to the central node via wavelength-unit optical channels, allowing for the addition of channels as needed. This design reduces costs by utilizing inexpensive filters capable of extracting specific wavelengths. High reliability is achieved through optical switches that correct fiber transmission path failures.

Another notable patent involves an optical transmission apparatus and related systems. This invention includes an optical repeater and optical cross-connect equipment that manage switches based on supervisory information. Key components include a doped fiber for amplifying optical signals, wavelength multiplexers for outputting and multiplexing signals, and a driver that controls the light source using supervisory information.

Career Highlights

Yasushi Sawada is currently employed at Hitachi, Ltd., where he continues to innovate in the field of optical technologies. His work has been instrumental in advancing telecommunications infrastructure.

Collaborations

He has collaborated with notable colleagues, including Hideaki Tsushima and Shigeki Kitajima, contributing to various projects and innovations in the optical network domain.

Conclusion

Yasushi Sawada's contributions to optical networks and telecommunications have established him as a key figure in the industry. His innovative patents reflect his commitment to enhancing communication technologies.