Inventor

KAWACHI MASAO

JP22 patents

⚠️ This page may combine multiple inventors who share the name “KAWACHI MASAO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

KAWACHI MASAO

NIPPON TELEGRAPH & TELEPHONE

Hybrid optical integrated circuit

Integrated optical waveguide circuit and optical branch line test system using the same

Guided-wave optical branching device

Method for fabricating hybrid optical integrated circuit

Arrayed-wave guide grating multi/demultiplexer with loop-back optical paths

Guided-wave optical branching components and optical switches

Integrated optical device and method for manufacturing thereof

Integrated optical device and method for manufacturing thereof

Single mode channel optical waveguide with a stress-induced birefringence control region

Fabrication method of single-mode optical fiber preforms

Optical signal processor, method of its control, method of its designing, and method of its production

Guided-wave optical circuit and method for adjusting a characteristic thereof

Waveguide-type optical matrix switch

Method of fabricating multi-mode optical fiber preforms

Apparatus and method for writing storable images into a matrix-addressed image-storing liquid crystal display device

Automated optical main distributing frame system

Core torch for fabricating single-mode optical fiber preforms

Method for making single-polorization, single mode optical fibers

Single-mode optical fiber

Optical wavelength division multiplexing transmission network system using transmitting/receiving apparatuses having 2-input and 2-output optical path switching elements

CANADIAN PATENTS DEV

Optical fiber coupler with tunable coupling ratio and method of making

OKI ELECTRIC IND CO LTD

Compact optical switching module including thin-film heaters and trimmed thick-film fixed resistors