Keiji Okamoto

Title: Keiji Okamoto: Innovator in Optical Fiber Technology

Introduction

Keiji Okamoto is a prominent inventor based in Musashino, Japan, known for his significant contributions to optical fiber technology. With a total of 13 patents to his name, Okamoto has made remarkable advancements in the field, particularly in phase measurement and vibration detection methods.

Latest Patents

One of Okamoto's latest patents is a phase measuring method that utilizes wavelength-multiplexed pulsed light directed at a measurement target optical fiber. This method produces a scattered light vector by plotting the scattered light from the optical fiber onto a two-dimensional plane. The in-phase component is represented on the horizontal axis, while the orthogonal component is on the vertical axis. The scattered light vector is then rotated for each wavelength to align the directions of the vectors. A new vector is generated by calculating the arithmetic average of these aligned vectors, allowing for accurate phase calculation using the in-phase and orthogonal components of the new vector.

Another notable patent is a vibration detection method that enhances signal processing to accurately detect vibrations applied to an optical fiber. This method employs a simple determination reference by indicating scattered light of a target segment of the measurement fiber with vectors of in-phase and quadrature components. A triangular shape formed by the near-end-side vector and the far-end-side vector is tracked to determine the presence of vibration based on changes in the shape of the triangle compared to a reference state. This innovative detection method combines DAS-I and DAS-P, reducing the chances of overlooking vibration detection.

Career Highlights

Keiji Okamoto is currently employed at Nippon Telegraph and Telephone Corporation, where he continues to develop cutting-edge technologies in optical fiber applications. His work has significantly impacted the telecommunications industry, enhancing the capabilities of fiber optic systems.

Collaborations

Throughout his career, Okamoto has collaborated with notable colleagues, including Hiroyuki Oshida and Atsushi Nakamura. These partnerships have fostered innovation and contributed to the advancement of optical fiber technology.

Conclusion

Keiji Okamoto's contributions to optical fiber technology through his patents and innovative methods have established him as a leading figure in the field. His work continues to influence advancements in telecommunications and signal processing.