Inventor

OKAMOTO KATSUNARI

JP22 patents

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

OKAMOTO KATSUNARI

NIPPON TELEGRAPH & TELEPHONE

Polarization maintaining optical fiber with improved polarization maintaining property

Optical fiber

Optical signal processing apparatus and optical signal processing method

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

Optical waveguide circuit, its manufacturing method and optical waveguide module having the optical waveguide circuit

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

Single mode optical fibers

CDMA encoder-decoder, CDMA communication system, WDM-CDMA communication system

Optical signal processing apparatus and optical signal processing method

Wavelength division multi/demultiplexer

Arrayed-waveguide grating

Dispersion slope equalizer

Optical filter

Single-polarization single-mode optical fiber

Optical signal processing device using optical gate

Dispersion slope equalizer

Single mode optical fibers

OKAMOTO KATSUNARI

Planar lightwave fourier-transform spectrometer

Arrayed waveguide grating (AWG) with different radii in the input and output slab regions

NTT ELECTRONICS CORP

Optical multiplexer and method for its production

Matrix switch of optical waveguide type and method for manufacturing the same

TAKADA KAZUMASA

Planar lightwave fourier-transform spectrometer measurement including phase shifting for error correction