Company Filing History:
10 out of 2,637 
2 out of 5,290 
Years Active: 2003-2015
Title: Iwao Shimotakahara: Innovator in Optical Fiber Technology
Introduction
Iwao Shimotakahara is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of optical fiber technology, holding a total of 10 patents. His work has advanced the capabilities of optical fibers, making them more efficient for high-capacity transmission.
Latest Patents
One of his latest patents is for a hole-assisted optical fiber. This innovative design includes a core portion and a cladding portion that features an inner cladding layer, an outer cladding layer, and holes formed around the core portion. The core diameter ranges from 3 µm to 9.8 µm, with a relative refractive index difference of 0.11% to 0.45%. The inner cladding layer has an outside diameter of 53 µm or less, and the holes have a diameter between 2.4 µm and 4.0 µm. The optical fiber is designed to minimize bending loss at a wavelength of 1625 nm when bent at a radius of 5 mm, achieving a loss of 1 dB/turn or less.
Another notable patent involves an optical fiber suitable for high-capacity transmission. This fiber boasts a large effective core area and low bending loss, capable of single-mode operation at 1550 nm. It features an effective core area of at least 175 µm at 1550 nm and maintains a bending loss of 10 dB/m at a bending diameter of 20 mm at the same wavelength.
Career Highlights
Iwao Shimotakahara has worked with notable companies such as Furukawa Electric Co., Ltd. and Nippon Telegraph and Telephone Corporation. His experience in these organizations has allowed him to develop and refine his innovative ideas in optical fiber technology.
Collaborations
Throughout his career, Iwao has collaborated with esteemed colleagues, including Ryuichi Sugizaki and Takeshi Yagi. These partnerships have contributed to the advancement of his research and the successful development of his patents.
Conclusion
Iwao Shimotakahara is a distinguished inventor whose work in optical fiber technology has significantly impacted the industry. His innovative patents and collaborations highlight his dedication to advancing this field. His contributions continue to shape the future of high-capacity transmission technologies.