This inventor holds 18 USPTO granted patents and 5 published patent applications and 1 EPO patent. Top assignees: Nec Corporation, Nec Laboratories America, Inc.. Active years: 1999-2026.
Company Filing History:
18 out of 36,653 
1 out of 718 
Years Active: 1999-2026
Title: Takefumi Oguma: Innovator in Optical Transmission Technology
Introduction
Takefumi Oguma is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of optical transmission technology, holding a total of 18 patents. His work has advanced the capabilities of optical communication systems, making them more efficient and reliable.
Latest Patents
Among his latest patents, Oguma has developed an optical transmission apparatus and a control method for this apparatus. This innovation includes a multiplexing unit that combines multiple subcarrier signals for optical wavelength multiplexing communication into a wavelength group signal. The output unit then transmits this multiplexed signal to an optical transmission line. Additionally, he has created a pre-multiplexing level correction unit that adjusts level deviations between subcarrier signals before multiplexing, as well as a post-multiplexing level correction unit that addresses level deviations after multiplexing. Another notable patent is for an optical time domain reflectometer, which includes an optical detection unit that identifies return light and outputs a detection signal. This system is designed to monitor optical transmission lines effectively.
Career Highlights
Takefumi Oguma has worked with notable companies such as NEC Corporation and NEC Laboratories America, Inc. His experience in these organizations has allowed him to refine his expertise in optical technologies and contribute to groundbreaking innovations in the field.
Collaborations
Oguma has collaborated with talented individuals in his field, including Yurie Matsuyama and Yuhei Matsumoto. These partnerships have fostered a creative environment that has led to the development of advanced optical technologies.
Conclusion
Takefumi Oguma's contributions to optical transmission technology have significantly impacted the industry. His innovative patents and collaborations highlight his dedication to advancing communication systems. His work continues to inspire future developments in optical technology.