Company Filing History:
Years Active: 2008-2010
Title: Toshihiko Hirooka: Innovator in Optical Transmission Technologies
Introduction
Toshihiko Hirooka is a prominent inventor based in Sendai, Japan. He has made significant contributions to the field of optical transmission technologies. With a total of 4 patents to his name, Hirooka's work focuses on methods and apparatuses that enhance the efficiency and reliability of optical communications.
Latest Patents
Hirooka's latest patents include an optical transmission method and an optical transmission apparatus designed to compensate for waveform distortion. This innovation utilizes the principle that the spectral shape is preserved even when linear distortions occur along the time axis. The optical pulse is transmitted from an optical pulse transmitter through an optical fiber transmission line. An optical Fourier transformer receives the pulse and performs a Fourier transformation, allowing for the reproduction of the frequency spectrum. This process effectively compensates for waveform distortion caused by linear effects in the optical fiber transmission line.
Another notable patent is the OTDM transmission method and apparatus, which enables distortion-free transmission that does not rely heavily on dispersion. The method involves a time division multiplexed OTDM signal entering an optical Fourier transform unit. The unit converts the time waveform of the pulse into a frequency signal, while an optical inverse Fourier transform unit converts the spectral shape back into a time waveform. This innovative approach allows for effective transmission even in the presence of various dispersions.
Career Highlights
Hirooka is affiliated with the Japan Science and Technology Agency, where he continues to advance research in optical technologies. His work has been instrumental in developing methods that improve the performance of optical communication systems.
Collaborations
Hirooka collaborates with Masataka Nakazawa, a fellow researcher in the field. Their partnership has led to advancements in optical transmission technologies, further enhancing the capabilities of communication systems.
Conclusion
Toshihiko Hirooka's contributions to optical transmission technologies have significantly impacted the field of communications. His innovative patents demonstrate a commitment to improving the efficiency and reliability of optical systems.