Inventor
OKA AKIRA
29 patents
⚠️ This page may combine multiple inventors who share the name “OKA AKIRA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJIKURA LTD
13 patentsUS9529151B2Dec 27, 2016
Polarization conversion element
FUJIKURA LTD21 citations92
US9500807B2Nov 22, 2016
Planar optical waveguide element, dual polarization quadrature phase shift keying modulator, coherent receiver, and polarization diversity
FUJIKURA LTD21 citations92
US9851504B2Dec 26, 2017
Planar optical waveguide device, DP-QPSK modulator, coherent receiver, and polarization diversity
FUJIKURA LTD8 citations84
US9557482B2Jan 31, 2017
High-order polarization conversion device, optical waveguide device, and DP-QPSK modulator
FUJIKURA LTD15 citations84
US9874692B2Jan 23, 2018
Substrate-type optical waveguide element and method for producing substrate-type optical waveguide element
FUJIKURA LTD4 citations73
US9851505B2Dec 26, 2017
Substrate-type optical waveguide element
FUJIKURA LTD5 citations73
US9835798B2Dec 5, 2017
Planar optical waveguide device, polarization multiplexing 4-value phase modulator, coherent receiver, and polarization diversity
FUJIKURA LTD5 citations73
US9810842B2Nov 7, 2017
Substrate-type optical waveguide element
FUJIKURA LTD3 citations73
US9335472B2May 10, 2016
Planar optical waveguide device and DP-QPSK modulator
FUJIKURA LTD4 citations73
US9304254B2Apr 5, 2016
Substrate-type waveguide element and optical modulator
FUJIKURA LTD4 citations73
US10422953B2Sep 24, 2019
Optical module and inputting method
FUJIKURA LTD0 citations52
US9784918B2Oct 10, 2017
Substrate-type optical waveguide element
FUJIKURA LTD1 citations52
US9008476B2Apr 14, 2015
Polarization conversion device
FUJIKURA LTD1 citations52
FUJITSU OPTICAL COMPONENTS LTD
10 patentsUS11223425B2Jan 11, 2022
Optical circuit device, and optical receiver
FUJITSU OPTICAL COMPONENTS LTD5 citations73
US11543593B2Jan 3, 2023
Optical device, and light source module using the same
FUJITSU OPTICAL COMPONENTS LTD0 citations62
US12276832B2Apr 15, 2025
Optical device, substrate optical waveguide element, and optical communication apparatus
FUJITSU OPTICAL COMPONENTS LTD0 citations59
US12487400B2Dec 2, 2025
Optical device, substrate type optical waveguide element, optical communication apparatus, and inter-waveguide transition method
FUJITSU OPTICAL COMPONENTS LTD0 citations52
US12184338B2Dec 31, 2024
Optical 90-degree hybrid
FUJITSU OPTICAL COMPONENTS LTD0 citations52
US12021562B2Jun 25, 2024
Tap coupler, optical communication apparatus, and optical branching method
FUJITSU OPTICAL COMPONENTS LTD0 citations52
US11714234B2Aug 1, 2023
Optical waveguide device that converts polarization of light
FUJITSU OPTICAL COMPONENTS LTD0 citations52
US11662522B2May 30, 2023
Optical waveguide device operated as mode converter
FUJITSU OPTICAL COMPONENTS LTD0 citations52
US11460635B2Oct 4, 2022
Optical waveguide device
FUJITSU OPTICAL COMPONENTS LTD0 citations52
US11307355B2Apr 19, 2022
90-degree optical hybrid
FUJITSU OPTICAL COMPONENTS LTD0 citations52
FUJITSU LTD
3 patentsUS4226491AOct 7, 1980
Electronic device having a printed circuit board unit therein
FUJITSU LTD152 citations93
US4496057AJan 29, 1985
Rack structure for mounting a communication apparatus
FUJITSU LTD36 citations89
US4510552AApr 9, 1985
Device for housing communication circuits and equipment
FUJITSU LTD13 citations65