Takefumi Oguma

Person

Tokyo, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical transmission apparatus and control method of optical transm...
- Patent number 11,626,937
- Issue date Apr 11, 2023
- NEC Corporation
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical time domain reflectometer, test method of optical transmiss...
- Patent number 11,483,067
- Issue date Oct 25, 2022
- NEC Corporation
- Yuhei Matsumoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical time domain reflectometer, method of testing optical transm...
- Patent number 11,476,930
- Issue date Oct 18, 2022
- NEC Corporation
- Yuhei Matsumoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical transmission device
- Patent number 10,659,165
- Issue date May 19, 2020
- NEC Corporation
- Yurie Matsuyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical device with optical filters and processing method of optica...
- Patent number 10,539,741
- Issue date Jan 21, 2020
- NEC Corporation
- Yurie Matsuyama
- G02 - OPTICS
Information Patent Grant
Optical channel monitor
- Patent number 8,879,908
- Issue date Nov 4, 2014
- NEC Corporation
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Wavelength division multiplexing transmission system, optical chann...
- Patent number 8,837,939
- Issue date Sep 16, 2014
- NEC Corporation
- Hiromitsu Sugahara
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Collection of data from an optical channel monitor without causing...
- Patent number 8,238,745
- Issue date Aug 7, 2012
- NEC Corporation
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and system for power stability control in wavelength divisio...
- Patent number 8,135,280
- Issue date Mar 13, 2012
- NEC Laboratories America, Inc.
- Lei Zong
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Wavelength division multiplexing filter, wavelength division multip...
- Patent number 8,095,011
- Issue date Jan 10, 2012
- NEC Corporation
- Yutaka Yano
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical feedback control unit, optical communication system, feedba...
- Patent number 7,649,162
- Issue date Jan 19, 2010
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for adjusting loss caused by optical fiber cur...
- Patent number 7,389,032
- Issue date Jun 17, 2008
- NEC Corporation
- Takefumi Oguma
- G02 - OPTICS
Information Patent Grant
Output monitor/control apparatus and optical communication system
- Patent number 7,127,183
- Issue date Oct 24, 2006
- NEC Corporation
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Heating element device, heating element mounted structure, temperat...
- Patent number 6,911,627
- Issue date Jun 28, 2005
- NEC Corporation
- Takefumi Oguma
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Temperature controller and light-waveguide with the same
- Patent number 6,601,401
- Issue date Aug 5, 2003
- NEC Corporation
- Takefumi Oguma
- F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
Information Patent Grant
Laser oscillation wavelength monitoring device
- Patent number 6,597,483
- Issue date Jul 22, 2003
- NEC Corporation
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical passive device for an optical fiber amplifier and the optic...
- Patent number 5,936,768
- Issue date Aug 10, 1999
- NEC Corporation
- Takefumi Oguma
- G02 - OPTICS
Information Patent Grant
Optical equalizer and optical amplifier and wavelength multiple opt...
- Patent number 5,880,874
- Issue date Mar 9, 1999
- NEC Corporation
- Takashi Shibuya
- G02 - OPTICS

Patents Applicationslast 30 patents

Information Patent Application
OPTICAL AMPLIFIER
- Publication number 20240055819
- Publication date Feb 15, 2024
- NEC Corporation
- Takefumi Oguma
- G02 - OPTICS
Information Patent Application
NODE APPARATUS, WDM TRANSMISSION SYSTEM, AND CONTROL METHOD
- Publication number 20230138272
- Publication date May 4, 2023
- NEC Corporation
- Kazunori SHINYA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL TRANSMISSION APPARATUS AND CONTROL METHOD OF OPTICAL TRANSM...
- Publication number 20230104053
- Publication date Apr 6, 2023
- NEC Corporation
- Takefumi OGUMA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL TIME DOMAIN REFLECTOMETER, METHOD OF TESTING OPTICAL TRANSM...
- Publication number 20210328667
- Publication date Oct 21, 2021
- NEC Corporation
- Yuhei MATSUMOTO
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL TIME DOMAIN REFLECTOMETER, TEST METHOD OF OPTICAL TRANSMISS...
- Publication number 20210194577
- Publication date Jun 24, 2021
- NEC Corporation
- Yuhei MATSUMOTO
- G01 - MEASURING TESTING
Information Patent Application
OPTICAL TRANSMISSION APPARATUS AND CONTROL METHOD OF OPTICAL TRANSM...
- Publication number 20190097749
- Publication date Mar 28, 2019
- NEC Corporation
- Takefumi OGUMA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL DEVICE
- Publication number 20190064437
- Publication date Feb 28, 2019
- NEC Corporation
- Yurie MATSUYAMA
- G02 - OPTICS
Information Patent Application
OPTICAL TRANSMISSION DEVICE
- Publication number 20190058526
- Publication date Feb 21, 2019
- NEC Corporation
- Yurie MATSUYAMA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL TRANSMISSION DEVICE
- Publication number 20130315601
- Publication date Nov 28, 2013
- NEC Corporation
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL TRANSMISSION DEVICE
- Publication number 20130315602
- Publication date Nov 28, 2013
- NEC Corporation
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL CHANNEL MONITOR
- Publication number 20120321299
- Publication date Dec 20, 2012
- NEC Corporation
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL CHANNEL MONITOR AND METHOD OF CALCULATING SIGNAL LIGHT LEVE...
- Publication number 20120008941
- Publication date Jan 12, 2012
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
WAVELENGTH DIVISION MULTIPLEXING TRANSMISSION SYSTEM, OPTICAL CHANN...
- Publication number 20110286745
- Publication date Nov 24, 2011
- HIROMITSU SUGAHARA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
WAVELENGTH DIVISION MULTIPLEXING FILTER, WAVELENGTH DIVISION MULTIP...
- Publication number 20090226173
- Publication date Sep 10, 2009
- YUTAKA YANO
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
COLLECTION OF DATA FROM AN OPTICAL CHANNEL MONITOR WITHOUT CAUSING...
- Publication number 20090162054
- Publication date Jun 25, 2009
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
METHOD AND SYSTEM FOR POWER STABILITY CONTROL IN WAVELENGTH DIVISIO...
- Publication number 20090092391
- Publication date Apr 9, 2009
- NEC Laboratories America, Inc.
- Lei Zong
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL FEEDBACK CONTROL UNIT, OPTICAL COMMUNICATION SYSTEM, FEEDBA...
- Publication number 20080217511
- Publication date Sep 11, 2008
- TAKEFUMI OGUMA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
METHOD AND APPARATUS FOR ADJUSTING LOSS CAUSED BY OPTICAL FIBER CUR...
- Publication number 20070189697
- Publication date Aug 16, 2007
- Takefumi OGUMA
- G02 - OPTICS
Information Patent Application
Optical add/drop device, optical add/drop system, and optical signa...
- Publication number 20060239684
- Publication date Oct 26, 2006
- NEC Corporation
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Heating element device, heating element mounted structure, temperat...
- Publication number 20030230566
- Publication date Dec 18, 2003
- NEC Corporation
- Takefumi Oguma
- G02 - OPTICS
Information Patent Application
Heater for heating waveguide and waveguide with heater
- Publication number 20030127445
- Publication date Jul 10, 2003
- NEC Corporation
- Takefumi Oguma
- G02 - OPTICS
Information Patent Application
Output monitor/control apparatus and optical communication system
- Publication number 20020041414
- Publication date Apr 11, 2002
- Takefumi Oguma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Temperature controller and light-waveguide with the same
- Publication number 20020035835
- Publication date Mar 28, 2002
- Takefumi Oguma
- G01 - MEASURING TESTING

Takefumi Oguma

Person

Patents Grantslast 30 patents

Optical transmission apparatus and control method of optical transm...

Optical time domain reflectometer, test method of optical transmiss...

Optical time domain reflectometer, method of testing optical transm...

Optical transmission device

Optical device with optical filters and processing method of optica...

Optical channel monitor

Wavelength division multiplexing transmission system, optical chann...

Collection of data from an optical channel monitor without causing...

Method and system for power stability control in wavelength divisio...

Wavelength division multiplexing filter, wavelength division multip...

Optical feedback control unit, optical communication system, feedba...

Method and apparatus for adjusting loss caused by optical fiber cur...

Output monitor/control apparatus and optical communication system

Heating element device, heating element mounted structure, temperat...

Temperature controller and light-waveguide with the same

Laser oscillation wavelength monitoring device

Optical passive device for an optical fiber amplifier and the optic...

Optical equalizer and optical amplifier and wavelength multiple opt...

Patents Applicationslast 30 patents

OPTICAL AMPLIFIER

NODE APPARATUS, WDM TRANSMISSION SYSTEM, AND CONTROL METHOD

OPTICAL TRANSMISSION APPARATUS AND CONTROL METHOD OF OPTICAL TRANSM...

OPTICAL TIME DOMAIN REFLECTOMETER, METHOD OF TESTING OPTICAL TRANSM...

OPTICAL TIME DOMAIN REFLECTOMETER, TEST METHOD OF OPTICAL TRANSMISS...

OPTICAL TRANSMISSION APPARATUS AND CONTROL METHOD OF OPTICAL TRANSM...

OPTICAL DEVICE

OPTICAL TRANSMISSION DEVICE

OPTICAL TRANSMISSION DEVICE

OPTICAL TRANSMISSION DEVICE

OPTICAL CHANNEL MONITOR

OPTICAL CHANNEL MONITOR AND METHOD OF CALCULATING SIGNAL LIGHT LEVE...

WAVELENGTH DIVISION MULTIPLEXING TRANSMISSION SYSTEM, OPTICAL CHANN...

WAVELENGTH DIVISION MULTIPLEXING FILTER, WAVELENGTH DIVISION MULTIP...

COLLECTION OF DATA FROM AN OPTICAL CHANNEL MONITOR WITHOUT CAUSING...

METHOD AND SYSTEM FOR POWER STABILITY CONTROL IN WAVELENGTH DIVISIO...

OPTICAL FEEDBACK CONTROL UNIT, OPTICAL COMMUNICATION SYSTEM, FEEDBA...

METHOD AND APPARATUS FOR ADJUSTING LOSS CAUSED BY OPTICAL FIBER CUR...

Optical add/drop device, optical add/drop system, and optical signa...

Heating element device, heating element mounted structure, temperat...

Heater for heating waveguide and waveguide with heater

Output monitor/control apparatus and optical communication system

Temperature controller and light-waveguide with the same