Location History:
- Ibaraki, JP (2000 - 2001)
- Hitachi, JP (2003)
Company Filing History:
3 out of 836 
1 out of 832,880 Years Active: 2000-2003
Title: **Innovative Contributions of Koichi Maru in Optical Technology**
Introduction
Koichi Maru, an inventive mind hailing from Hitachi, Japan, has made significant strides in the field of optical technology. With a remarkable portfolio of four patents, Maru has been at the forefront of developing innovative solutions that enhance the performance and efficiency of optical devices.
Latest Patents
Among Maru's latest patents are two noteworthy inventions. The first is an **array waveguide grating and method of manufacture thereof**. This invention is designed to achieve a substantially smooth wavelength-loss characteristic in the pass band, rather than increasing the loss. The array waveguide grating allows for the demultiplexing of wavelength multiplex division signal light, utilizing a channel waveguide array and a Fabry-Perot resonator array to facilitate optimal performance.
The second patent is an **optical wavelength multiplexer/demultiplexer**. This device incorporates a substrate, input and output channel waveguides, and output slab waveguides, taking into account temperature compensation materials to address diffraction temperature changes. This invention improves the precision and reliability of wavelength multiplexing, enhancing the overall quality of optical signal processing.
Career Highlights
Throughout his career, Koichi Maru has contributed his expertise to companies such as Hitachi Cable, Inc. His work in this reputable organization has helped pave the way for advancements in fiber optics and telecommunications.
Collaborations
Maru's innovative journey has been shared with notable coworkers, including Hisato Uetsuka and Masahiro Okawa. Collaborating with talented individuals has undoubtedly enriched Maru's perspective and capabilities in the realm of optical inventions.
Conclusion
Koichi Maru's contributions to the field of optical technology through his innovations in waveguide gratings and multiplexers demonstrate the importance of inventive pursuits in advancing communication technologies. His patents are a testament to his dedication to enhancing optical performance and will likely inspire future innovations within the industry.