Location History:
- Shizuoka, JP (2004)
- Kawasaki, JP (2005)
Company Filing History:
Years Active: 2004-2005
Title: Innovations by Isao Nakajima: Pioneering Polarization and Optical Communication
Introduction
Isao Nakajima, an esteemed inventor based in Kawasaki, Japan, has made significant contributions to the fields of optical communication and polarization technologies. With three patents to his name, Nakajima's innovations are particularly noted for their applications in enhancing the efficiency and reliability of optical systems.
Latest Patents
Nakajima's latest patents include a polarized wave scrambler and an optical signal transmission apparatus. This invention focuses on suppressing polarization mode dispersion by employing first and second polarization maintaining optical fibers. The design ensures that the constant components of the phase difference characteristics for optical frequencies between the high-speed and low-speed axes of these fibers are equal. Moreover, it establishes that the respective slopes of these characteristics differ, allowing for optimal function when the plane of polarization of the linearly polarized optical signal is aligned at a specific angle.
Additionally, Nakajima has developed a system and method for equalizing transmission characteristics in a wavelength division multiplexing (WDM) optical communication system. In this innovative approach, at least one optical tunable filter is positioned along an optical fiber transmission path. This filter features a controllable transmission factor versus wavelength characteristic, and utilizes feedback from measurements taken at the receiving station to adjust pre-emphasis and filter controls to enhance signal quality.
Career Highlights
Isao Nakajima is currently associated with Fujitsu Corporation, a leading information technology and communication giant. His work has had a lasting impact on optical communication, making substantial advancements in transmission characteristics and the management of optical signals.
Collaborations
Throughout his career, Nakajima has collaborated with talented professionals in the field, including Shin-ichirou Harasawa and Sadao Ibukuro. Together, they have contributed to the development of cutting-edge technology that addresses the challenges in modern optical communication systems.
Conclusion
Isao Nakajima's innovations represent a significant leap in optical communication technology, disrupting traditional methods and introducing advanced solutions for polarization and signal transmission. His commitment to research and development sets a remarkable example for future inventors in the field of optical technologies. With his continued dedication, we can expect to see even more groundbreaking advancements from Nakajima in the years to come.