Hiroshi Yamazaki

Title: Hiroshi Yamazaki: Innovator in Optical Transmission Technology

Introduction

Hiroshi Yamazaki is a prominent inventor based in Musashino, Japan. He has made significant contributions to the field of optical transmission technology, holding a total of 2 patents. His work focuses on enhancing signal quality and transmission efficiency in optical systems.

Latest Patents

Yamazaki's latest patents include an optical transmission system and a signal quality measurement apparatus and method. The optical transmission system involves a transmission apparatus that repeatedly inserts reference signal sequences into a transmission signal sequence at different timings. This system converts the transmission signal sequence into an optical signal. The reception apparatus consists of a detection unit, a waveform equalization unit, and a signal quality measurement unit. The detection unit receives the optical signal transmitted through an optical transmission line and converts it into an electrical reception signal. The waveform equalization unit performs waveform equalization on this reception signal. The signal quality calculation unit extracts reception signal sequences corresponding to the reference signal sequence and calculates the mean square error, signal-to-noise ratio, and signal-to-distortion ratio.

Another notable patent is a signal generation apparatus, method, and computer program. This device includes a digital signal processing unit and multiple digital-analog conversion units that convert digital signals into analog signals. An analog multiplexer interleaves these analog signals to generate a broadband signal. The digital signal processing unit divides an input signal into several parts based on the sampling frequency and clock frequency, generating multiple divided signals for further processing.

Career Highlights

Hiroshi Yamazaki is currently employed at NTT Corporation, where he continues to innovate in the field of optical technologies. His work has significantly impacted the efficiency and quality of optical signal transmission.

Collaborations

Yamazaki collaborates with notable colleagues, including Masanori Nakamura and Fukutaro Hamaoka, contributing to advancements in their shared field of expertise.

Conclusion

Hiroshi Yamazaki's contributions to optical transmission technology through his patents and work at NTT Corporation highlight his role as a key innovator in the industry. His inventions continue to influence the development of efficient optical communication systems.