Seiji Nogiwa

Title: Seiji Nogiwa: Innovator in Optical Communication Technologies

Introduction

Seiji Nogiwa is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of optical communications, holding a total of 6 patents. His work focuses on developing advanced light source devices and optical-frequency-stabilized light sources, which are crucial for modern communication systems.

Latest Patents

One of Nogiwa's latest patents is a light source device for frequency division multiplexed optical communications. The invention aims to provide a compact and cost-effective light source device. It features light source units that output light with optical frequencies oscillating at different modulation frequencies. The device includes optical splitters that divide the output light into two parts and an optical multiplexer-splitter that multiplexes and splits the light. Additionally, a Fabry-Perot etalon resonator transmits each component of the output light at specific rates. A light receiving element converts the output light into an electrical signal, while a transmission change sensing unit monitors changes in transmission. A CPU controls the light source units to maximize output.

Another notable patent is the optical-frequency-stabilized light source, which offers high accuracy and stability. This invention includes an optical splitter that divides output light into two beams and an optical detector that detects beat signals formed by the frequency difference. A rectifier processes the beat signal, and a time measuring circuit records the timing of the signal. A frequency measuring circuit assesses the beat frequency, while a CPU ensures the local light source's frequency aligns with the target optical frequency.

Career Highlights

Throughout his career, Seiji Nogiwa has worked with notable companies such as Ando Electric Company and Nippon Telegraph and Telephone Corporation. His experience in these organizations has contributed to his expertise in optical technologies and innovations.

Collaborations

Nogiwa has collaborated with esteemed colleagues, including Kazuo Aida and Kiyoshi Nakagawa. Their joint efforts have further advanced the field of optical communications.

Conclusion

Seiji Nogiwa's contributions to optical communication technologies through his innovative patents and collaborations highlight his significant role in the industry. His work continues to influence advancements in communication systems, making him a key figure in the field.