Haruhiko Kuwatsuka

Title: Haruhiko Kuwatsuka: Innovator in Optical Technology

Introduction

Haruhiko Kuwatsuka is a prominent inventor based in Tsukuba, Japan. He has made significant contributions to the field of optical technology, holding a total of 4 patents. His work focuses on enhancing the performance and efficiency of optical devices, particularly in the areas of phase control and wavelength tunability.

Latest Patents

Kuwatsuka's latest patents include a driving device and driving method for phase controllers, as well as an optical transmitter implementing a wavelength tunable diode. The driving device is designed for PWM control of voltage pulses, which are used to regulate the temperature of heaters in a phase controller. This innovation allows for increased response speed of optical elements, such as optical switches. The phase controllers feature first and second heaters that adjust the temperatures of optical waveguides. The pulse generation circuits within the driving devices create voltage pulses to control these heaters effectively.

The optical transmitter patent describes a device that incorporates a wavelength tunable laser diode with a narrowed emission linewidth. This optical transmitter includes a feedback unit that modifies the polarization of the laser light, generating feedback light that is returned to the laser diode. Additionally, an optical attenuator is included to adjust the power of the feedback light, thereby reducing frequency noise and enhancing the stability of the laser output.

Career Highlights

Throughout his career, Haruhiko Kuwatsuka has worked with esteemed organizations such as the National Institute of Advanced Industrial Science and Technology and Sumitomo Electric Industries, Limited. His experience in these institutions has allowed him to develop cutting-edge technologies that have advanced the field of optics.

Collaborations

Kuwatsuka has collaborated with notable colleagues, including Katsumi Uesaka and Hiroyuki Matsuura. These partnerships have contributed to the successful development of his innovative technologies.

Conclusion

Haruhiko Kuwatsuka's contributions to optical technology through his patents and collaborations highlight his role as a leading inventor in the field. His work continues to influence advancements in optical devices and systems.