Makoto Shimizu

Title: The Innovations of Makoto Shimizu

Introduction

Makoto Shimizu is a prominent inventor based in Mito, Japan. He has made significant contributions to the field of optical fiber technology, holding a total of 10 patents. His work focuses on enhancing the performance and efficiency of optical fibers, which are crucial for modern telecommunications.

Latest Patents

One of his latest patents is an innovative optical fiber and production method. This optical fiber features a zero-material dispersion wavelength equal to or greater than 2 μm and a high nonlinear susceptibility χ equal to or greater than 1×10 esu. It utilizes tellurite glass, which has sufficient thermal stability for processing into a low-loss fiber. The design employs a photonic crystal fiber (PCF) structure or high confinement (HF) structure that allows light to propagate with minimal loss. The size and geometry of the air holes formed in the core region, along with the spacing between adjacent air holes, enable control over the zero dispersion wavelength within the optical telecommunication window of 1.2-1.7 μm. This design achieves large nonlinearity with a nonlinear coefficient γ equal to or greater than 500 Wkm. Another notable patent is the tellurite optical fiber and production method, which involves a fabrication process using tellurite glass as the core material. This method includes molding a tellurite glass melt into a mold with convex portions that define an inner wall, creating a polygon columnar glass preform. The preform is then inserted into a cylindrical jacket tube made of tellurite glass, and fiber-drawing is performed under pressure to maintain or enlarge the air holes generated between the preform and the jacket tube.

Career Highlights

Makoto Shimizu is currently employed at Nippon Telegraph and Telephone Corporation, where he continues to innovate in the field of optical communications. His work has significantly impacted the efficiency and capabilities of optical fibers, making them more effective for telecommunications applications.

Collaborations

Throughout his career, Shimizu has collaborated with notable colleagues, including Shinichi Aozasa and Hiroji Masuda. These collaborations have further advanced the research and development of optical fiber technologies.

Conclusion

Makoto Shimizu's contributions to optical fiber technology exemplify the importance of innovation in telecommunications. His patents reflect a commitment to enhancing the performance