Company Filing History:
2 out of 6 
1 out of 5 Years Active: 1987-1989
Title: Masayuki Nishimura: Innovator in Optical Fiber Technology
Introduction
Masayuki Nishimura is a prominent inventor based in Durham, NC (US), known for his contributions to optical fiber technology. He holds a total of 3 patents, showcasing his innovative approach to solving complex problems in the field.
Latest Patents
One of his latest patents is the "Simultaneous bi-directional optical time domain reflectometry method." This method involves a simultaneous bi-directional OTDR optical fiber measurement technique, where a test fiber is spliced between a launch fiber and a termination fiber with a reflective coating at its terminal end. A laser light pulse is introduced into the launch fiber, and both the forward and reverse trace signals from the light pulse are detected. A correction is applied to the reverse trace signal to account for reflectivity originating at the fiber input end, allowing for accurate measurements of certain fiber characteristics of a single-mode optical fiber.
Another significant patent is the "Method of measuring the refractive index profile of optical fibers." This method determines the refractive index profile of an optical fiber by focusing light from an intense optical source at the bare fiber end portion of the test fiber. A small amount of light is coupled into the optical fiber, where only cladding modes are excited in the short length of uncoated fiber. The index of refraction is determined directly by analyzing the intensity distribution emitted from the optical fiber using a lens system with a limited numerical aperture.
Career Highlights
Masayuki Nishimura has worked with notable companies such as Sumitomo Electric Research Triangle, Inc. and Sumitomo Electric Fiber Optics Corporation. His experience in these organizations has significantly contributed to his expertise in optical fiber technology.
Collaborations
He has collaborated with esteemed colleagues, including Eric L Buckland and William H Hatton, further enhancing his work in the field.
Conclusion
Masayuki Nishimura's innovative patents and career in optical fiber technology highlight his significant contributions to the industry. His work continues to influence advancements in optical measurement techniques.