This inventor holds 3 USPTO granted patents. Top assignee: Nec Corporation. Active years: 1987-1988.
Company Filing History:
Years Active: 1987-1988
Title: Innovations of Hiroyoshi Rangu
Introduction
Hiroyoshi Rangu is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of optical technology, holding a total of 3 patents. His work focuses on advancements in optical modulators and semiconductor laser oscillators.
Latest Patents
One of his latest patents is an optical modulator designed for varying intensity, frequency, phase, and other information associated with input light in response to an external voltage. This modulator features a semiconductor substrate and at least one ultrathin semiconductor layer, which is thinner than the order of the electron mean free path. The electrodes are capable of applying an electric field to the ultrathin layer perpendicularly. The band gap of the narrow band gap layers in the ultrathin layer is spatially varied in the perpendicular direction, with a monotonous reduction toward the ends.
Another notable patent is a frequency-stabilized semiconductor laser oscillator. This device applies a control signal derived from a modulation signal to a second optical waveguide adjacent to the first. This ensures that the overall optical path remains constant despite variations in the refractive index of the first optical waveguide. The control signal can be either a current or voltage signal, with mechanisms in place to compensate for changes in carrier density or electro-optic variations.
Career Highlights
Hiroyoshi Rangu is currently employed at NEC Corporation, where he continues to innovate in the field of optical technologies. His work has garnered attention for its potential applications in various industries, including telecommunications and data processing.
Collaborations
He has collaborated with notable coworkers such as Kazuhisa Kaede and Kenichi Nishi, contributing to the advancement of their shared projects and innovations.
Conclusion
Hiroyoshi Rangu's contributions to optical technology through his patents and collaborations highlight his role as a significant inventor in the field. His work continues to influence advancements in optical modulation and semiconductor laser technology.