This inventor holds 18 USPTO granted patents. Top assignees: Fujitsu Corporation, Nippon Telegraph and Telephone Corporation. Active years: 1991-2004.
Location History:
- Yokohama, JP (1991 - 1996)
- Kawasaki, JP (1994 - 2004)
Company Filing History:
18 out of 39,367 
1 out of 5,300 
Years Active: 1991-2004
Title: Keiko Takeda: Innovator in Optical Technologies
Introduction
Keiko Takeda is a prominent inventor based in Kawasaki, Japan. She has made significant contributions to the field of optical technologies, holding a total of 18 patents. Her work focuses on advancing optical signal processing and amplification methods.
Latest Patents
Among her latest innovations are the optical dropping apparatus and the optical add/drop multiplexer. The optical dropping apparatus is designed to drop optical signals of arbitrary wavelengths from a WDM optical signal. It features a generating means for four-wave mixing, a dropping means for selecting light of a predetermined wavelength, and a controlling means for adjusting the wavelength of the pump light. This technology allows for flexibility in changing the wavelengths of the optical signals being dropped.
Another notable invention is the solution doping method for creating an optical amplifying fiber. This fiber consists of a clad and multiple cores, including a first core containing Ge, a second core with Er and Al, and a third core also containing Ge. The design enhances the conversion efficiency of pumping light into signal light while ensuring a wide amplification bandwidth due to the inclusion of Al.
Career Highlights
Keiko Takeda has worked with leading companies in the telecommunications sector, including Fujitsu Corporation and Nippon Telegraph and Telephone Corporation. Her experience in these organizations has allowed her to develop and refine her innovative technologies.
Collaborations
Throughout her career, Takeda has collaborated with notable professionals in her field, including Shinya Inagaki and Kenji Tagawa. These partnerships have contributed to her success and the advancement of optical technologies.
Conclusion
Keiko Takeda's contributions to optical technologies have made her a significant figure in the field. Her innovative patents and collaborations reflect her dedication to advancing optical signal processing and amplification.