Keiko Takeda

This inventor holds 18 USPTO granted patents, primarily in Optical Amplifiers. Top assignees: Fujitsu Corporation, Nippon Telegraph and Telephone Corporation. Active years: 1991-2004.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Keiko Takeda. Retrieved from https://idiyas.com/inventor/keiko-takeda

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Calculating rank

USPTO Granted Patents = 18

% Patents Active = 100.0

Average Co-Inventor Count = 3.5

ph-index = 10

Forward Citations = 398(Granted Patents)

Location History:

Yokohama, JP (1991 - 1996)
Kawasaki, JP (1994 - 2004)

Company Filing History:

Nippon Telegraph and Telephone Corporation

patents

where one patent can have more than one assignee

Years Active: 1991-2004

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Areas of Expertise:

Optical Amplifier

Optical Fiber

Doping Method

Nonlinear Optical Phenomena

Dispersion Compensating Fiber

Optical Add/Drop Multiplexer

Electronic Photo Album

Presentation Data Conversion

Rare Earth-Doped Fiber

Picture Forming Device

Optical Transmitter

Fiber Optic Amplifier

18 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6748176 - Optical dropping apparatus and optical add/drop multiplexer (2004-06-08),

2. 6408652 - Solution doping method of making an optical amplifying fiber (2002-06-25),

3. 6266180 - Optical fiber amplifier using optical fiber having a portion which suppresses nonlinear optical phenomena (2001-07-24),

4. 6163398 - Dispersion compensating fiber and optical amplifier using same (2000-12-19),

5. 6111586 - Electronic photo album editing apparatus (2000-08-29),

6. 5970198 - Optically amplifying fiber and optical fiber amplifier (1999-10-19),

7. 5930436 - Optical amplifying fiber and process of producing the same (1999-07-27),

8. 5812113 - Picture forming device (1998-09-22),

9. 5708826 - Apparatus and method for converting presentation data (1998-01-13),

10. 5508842 - Optical amplifier (1996-04-16),

11. 5467218 - Optical fiber amplifier (1995-11-14),

12. 5327282 - Optical amplifier for 1.3 .mu.m band (1994-07-05),

13. 5276549 - Optical transmitter including rare earth-doped fiber (1994-01-04),

14. 5155621 - Optical fiber amplifier (1992-10-13),

15. 5140598 - Fiber optic amplifier (1992-08-18),

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.

Profile summary based on public USPTO records.

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]