Hiroyasu Mawatari

Title: Hiroyasu Mawatari: Innovator in Semiconductor Technology

Introduction

Hiroyasu Mawatari is a prominent inventor based in Isehara, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of 4 patents. His work focuses on developing advanced optical modulation elements and light source apparatuses.

Latest Patents

Mawatari's latest patents include a semiconductor optical modulation element designed to enhance reliability and speed while minimizing loss. This invention features a unique configuration that protects the pin junction structure against reverse voltage ESD. The design incorporates an additional capacity with a thyristor structure, strategically placed between multiple feeding pad electrodes. The layers of the device are meticulously arranged, including an n-type contact layer, an n-type cladding layer, a non-doped core/cladding layer, a p-type cladding layer, and a p-type contact layer. Furthermore, a Mach-Zehnder interferometric waveguide is created through dry etching, ensuring electrical isolation between the modulation region and the semiconductor beneath the feeding region.

Another notable patent is a light source apparatus with a modulation function. This device utilizes a wavelength conversion module made from a nonlinear optical material, which is periodically modulated. It effectively outputs a difference frequency or sum frequency by multiplexing light from semiconductor laser sources with varying wavelengths. The apparatus is designed to enhance the modulation capabilities of the output light, showcasing Mawatari's innovative approach to optical technologies.

Career Highlights

Throughout his career, Mawatari has worked with esteemed organizations such as Nippon Telegraph and Telephone Corporation and NTT Electronics Corporation. His experience in these companies has significantly influenced his research and development efforts in semiconductor technologies.

Collaborations

Mawatari has collaborated with notable colleagues, including Junji Yumoto and Osamu Tadanaga. Their combined expertise has contributed to the advancement of semiconductor innovations.

Conclusion

Hiroyasu Mawatari stands out as a key figure in semiconductor technology, with a focus on optical modulation and light source apparatuses. His patents reflect a commitment to innovation and excellence in the field.