Takeyasu Tomioka

Title: The Innovations of Takeyasu Tomioka

Introduction

Takeyasu Tomioka is a notable inventor based in Sapporo, Japan. He has made significant contributions to the field of optical technology, holding three patents that showcase his expertise and innovative spirit. His work primarily focuses on optical transmission devices and methods, which are crucial for modern communication systems.

Latest Patents

Tomioka's latest patents include an optical transmitter and a control method for a tunable optical filter. This optical transmitter features an optical modulator, a tunable optical filter, a temperature sensor, and a processor. The tunable optical filter is positioned on the output side of the optical modulator and transmits light at a frequency that corresponds to a control voltage. The temperature sensor plays a vital role by detecting the temperature around the tunable optical filter. The processor is responsible for detecting optical loss in the tunable optical filter, calculating the width of the control voltage range where the optical loss is below a specified threshold, and adjusting the control voltage based on the detected temperature. Additionally, it shifts the control voltage by a specified amount that is greater than zero and less than or equal to half of the calculated width when the optical loss meets or exceeds the threshold.

Another significant patent by Tomioka is for an optical transmission device and a method for controlling this device. This invention includes a first drive unit that adjusts the attenuation amount for an optical signal from an optical amplifier, and a second drive unit that drives the excitation light source of the optical amplifier. The device also features a first and second feedforward control unit that set values for their respective drive units and perform feedforward control. A first control unit manages the second drive unit to ensure that the optical output power from the optical amplifier reaches a predetermined target value. A switch unit is included to transition to the first control unit when the optical output power corresponding to the second set value is achieved.

Career Highlights

Takeyasu Tomioka is currently employed at Fujitsu Optical Components Limited, where he continues to develop innovative optical technologies. His work has significantly impacted the efficiency and effectiveness of optical communication systems.

Collaborations

Tomioka collaborates with talented individuals in his field, including Shuichi Yasuda and Masayuki Kurisu. Their combined expertise fosters an environment of innovation and advancement in optical technology.

Conclusion

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