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For the Inventor, By the Inventor

Kawasaki, Japan

Haruo Fujiwara

This inventor holds 6 USPTO granted patents. Top assignee: Fujitsu Corporation. Active years: 1992-2006.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Haruo Fujiwara. Retrieved from https://idiyas.com/inventor/haruo-fujiwara

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

USPTO Granted Patents = 6

% Patents Active = 83.3

Average Co-Inventor Count = 1.7

ph-index = 5

Forward Citations = 73(Granted Patents)


Location History:

  • Sagamihara, JP (1992)
  • Kawasaki, JP (1993 - 2006)

Company Filing History:

goldMedal6 out of 39,374 
 
Fujitsu Corporation
 patents

Years Active: 1992-2006

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6 patents (USPTO):Explore Patents
1. 7103275 - Optical transmission system (2006-09-05),
2. 5956167 - Light branching and insertion apparatus and optical transmission system (1999-09-21),
3. 5615290 - Branch device for optical multiplex system (1997-03-25),
4. 5282074 - Optical amplification repeating system (1994-01-25),
5. 5274496 - Optical amplifying repeater with monitor and control function (1993-12-28),
6. 5097353 - Optical repeater having phase inversion circuit (1992-03-17),

Title: Haruo Fujiwara: Innovator in Optical Transmission Systems

Introduction

Haruo Fujiwara is a prominent inventor based in Kawasaki, Japan. He has made significant contributions to the field of optical transmission systems, holding a total of 6 patents. His work focuses on enhancing the efficiency and reliability of optical communication technologies.

Latest Patents

One of Fujiwara's latest patents is an optical transmission system designed to monitor the operating status of Raman-amplifier repeaters. This system is capable of functioning even when an optical transmission line experiences partial disruptions due to fiber failures. The end station sends a monitoring command signal to a specific repeater, which then reports its operating status through a response carrier wave. The system utilizes different wavelengths to ensure effective communication and monitoring.

Another notable invention is a light branching and insertion apparatus that allows for accurate branching and insertion of signal light with minimal loss. This apparatus features multiple branching and insertion elements that work together to manage signal light from various optical fibers, ensuring high precision and efficiency in optical transmission.

Career Highlights

Fujiwara is currently employed at Fujitsu Corporation, where he continues to innovate in the field of optical technologies. His work has been instrumental in advancing the capabilities of optical communication systems, making them more robust and efficient.

Collaborations

Throughout his career, Fujiwara has collaborated with notable colleagues, including Takashi Miyazaki and Shinichirou Harasawa. These collaborations have contributed to the development of cutting-edge technologies in optical transmission.

Conclusion

Haruo Fujiwara's contributions to optical transmission systems have significantly impacted the field of telecommunications. His innovative patents and ongoing work at Fujitsu Corporation highlight his dedication to advancing optical technologies.

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]
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