Hiroaki Chida

Title: Hiroaki Chida: Innovator in Optical Technology

Introduction

Hiroaki Chida is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of optical technology, particularly in the development of advanced optical transmitting and receiving modules. With a total of 3 patents to his name, Chida continues to push the boundaries of innovation in his field.

Latest Patents

Chida's latest patents include a bidirectional optical transmitting/receiving module, an optical transmitting/receiving device, and a manufacturing method for bidirectional optical transmitting/receiving modules. These inventions aim to provide low-cost and high-performance optical modules. His designs incorporate a de-multiplexing device that utilizes a V-letter shaped optical waveguide and a dielectric multilayer filter. The formation of the end face, where the dielectric multilayer film is applied, and the separation of optical modules are executed in distinct steps. This method ensures that the end face at the intersection of the V-letter shaped optical waveguide is created through dry etching, achieving high smoothness. Additionally, the cutting face of the optical module is strategically positioned to be isolated from the end face by at least 3 micrometers, protecting the smooth end face from roughness caused during the light-emitting element separation process.

Another notable patent is the edge emitting semiconductor laser, which effectively suppresses 'beam steering' to enhance its maximum output with a straightforward configuration. The optical waveguide functions as a resonator and includes an active layer and a cladding layer. The design features two edges, with the first edge serving as the emission edge and the second edge positioned opposite to it. The waveguide consists of at least two sections with varying widths, one of which is designated as the fundamental mode section. Current injection suppressing means are integrated to control current injection into the active layer within the fundamental mode section, utilizing a current blocking layer, a current-limiting masking layer, or a passive wave-guiding region.

Career Highlights

Hiroaki Chida is currently employed at NEC Corporation, where he continues to innovate and develop cutting-edge optical technologies. His work has significantly impacted the industry, leading to advancements in optical communication systems.

Collaborations

Chida collaborates with fellow inventor Yoshiyasu Ueno, contributing to the development of innovative optical solutions.

Conclusion