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Yutaka Kai

This inventor holds 61 USPTO granted patents and 9 published patent applications and 10 EPO patents, primarily in Optical Communication (CPC class H04B). Top assignees: Fujitsu Corporation, The University of Tokyo. Active years: 2000-2025.

USPTO Granted Patents = 61 (Patent Applications = 9)

% Patents Active = 39.3

EPO Patents = 10 (Patent Applications = 13)

Average Co-Inventor Count = 2.7

ph-index = 9

Forward Citations = 300(Granted Patents)

Forward Citations (Not Self Cited) = 291(Dec 10, 2025)

Inventors with similar research interests:

Company Filing History:

The University of Tokyo

patents

where one patent can have more than one assignee

Years Active: 2000-2025

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Areas of Expertise:

Optical Transmission

Optical Receiver

Machine Learning

Signal Processing

Modulation

Optical Network

Wavelength Control

Optical Amplifier

Packet Switching

Communication System

Optical Switch

Frequency Control

61 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12505379 - Computer-readable recording medium storing machine learning program, machine learning method, and information processing device of improving performance of learning skip in training machine learning model (2025-12-23),

2. 10027408 - Multi-carrier optical transmission system, optical transmitter, and optical receiver (2018-07-17),

3. 9998233 - Optical reception apparatus (2018-06-12),

4. 9998230 - Optical transmitter, optical communication system, and optical transmission/reception control method (2018-06-12),

5. 9973276 - Optical receiving device and method for controlling dispersion compensation amount (2018-05-15),

6. 9876601 - Optical transmission system, controller for wavelength tunable filter, and control method of wavelength tunable filter (2018-01-23),

7. 9853728 - Method for determining numbers of bits allocated to subcarriers and optical transmission system (2017-12-26),

8. 9467229 - Multilevel intensity modulation and demodulation system and method (2016-10-11),

9. 9425897 - Transmission apparatus, transmission system, and transmission method (2016-08-23),

10. 9088383 - Transmitting apparatus, receiving apparatus, optical frequency division multiplex transmission system, and optical signal communication method (2015-07-21),

11. 9077470 - Optical transmission system using cross phase modulation (2015-07-07),

12. 9019593 - Optical amplification apparatus (2015-04-28),

13. 8937762 - Level control circuit, level control method, and level control system (2015-01-20),

14. 8867927 - Optical transmitting apparatus, optical receiving apparatus, and optical communication system comprising them (2014-10-21),

15. 8824043 - Optical output level control apparatus (2014-09-02),

Title: The Innovations of Yutaka Kai: Pioneering Optical Communication Technologies

Introduction

Yutaka Kai, an esteemed inventor based in Kawasaki, Japan, has made significant contributions to the field of optical communications. With an impressive portfolio of 60 patents, he has developed groundbreaking technologies that enhance data transmission capabilities and efficiency. His latest innovations reflect his dedication to pushing the boundaries of engineering.

Latest Patents

Among Yutaka Kai's latest patents are several noteworthy advancements in optical transmission systems. One such patent describes a multi-carrier optical transmission system, where an optical transmitter sends a multi-carrier modulated signal to an optical receiver. This innovative system employs a modulated signal, ensuring optimized communication by driving a light source based on the received monitor results. Additionally, his patents on optical transmitters, optical communication systems, and optical transmission/reception control methods outline a sophisticated approach to modulating input signals into multi-carrier signals, allowing for more effective data signal generation while carefully managing the characteristics of modulation through feedback mechanisms.

Career Highlights

Yutaka Kai has notably worked with prominent organizations, including Fujitsu Corporation and the University of Tokyo. His tenure at these institutions has allowed him to apply his extensive expertise in optical engineering to real-world applications, developing technologies that serve both academic and industrial sectors.

Collaborations

Throughout his career, Yutaka Kai has collaborated with esteemed colleagues, such as Hideyuki Miyata and Tomoo Takahara. These partnerships have facilitated a rich exchange of ideas, accelerating innovation within the optical communication domain.

Conclusion

Yutaka Kai's remarkable contributions to the field of optical communication have positioned him as a leader in technological advancements. His innovative patents reflect a profound understanding of complex engineering principles and a commitment to enhancing communication systems. As the industry continues to evolve, Yutaka Kai's work remains a testament to the power of innovation in shaping the future of technology.

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