Yuji Tamura

Person

Yokohama, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical transmission system and optical receiving apparatus
- Patent number 9,455,780
- Issue date Sep 27, 2016
- Fujitsu Limited
- Yuji Tamura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical amplifying device and optical amplifying method
- Patent number 8,922,879
- Issue date Dec 30, 2014
- Fujitsu Limited
- Yuji Tamura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical amplifier
- Patent number 8,174,758
- Issue date May 8, 2012
- Fujitsu Limited
- Shinichirou Muro
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Multistage optical amplifier with gain control using pump ratio
- Patent number 7,929,201
- Issue date Apr 19, 2011
- Fujitsu Limited
- Tatsuya Tsuzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Control of a light source providing excitation light
- Patent number 7,911,685
- Issue date Mar 22, 2011
- Fujitsu Limited
- Toshihiro Ohtani
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical amplifier and abnormality detection method for the same
- Patent number 7,880,960
- Issue date Feb 1, 2011
- Fujitsu Limited
- Kosuke Komaki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical switch device and optical switching method
- Patent number 7,639,945
- Issue date Dec 29, 2009
- Fujitsu Limited
- Yuji Tamura
- G02 - OPTICS
Information Patent Grant
Signal light interruption detecting method and optical amplifier us...
- Patent number 7,132,646
- Issue date Nov 7, 2006
- Fujitsu Limited
- Yuji Tamura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Light amplification control unit and method
- Patent number 7,133,192
- Issue date Nov 7, 2006
- Fujitsu Limited
- Tomoto Tanaka
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Constant current driving circuit
- Patent number 6,975,162
- Issue date Dec 13, 2005
- Fujitsu Limited
- Yuji Tamura
- G05 - CONTROLLING REGULATING
Information Patent Grant
Optical amplifying apparatus, an optical output controlling method...
- Patent number 6,219,177
- Issue date Apr 17, 2001
- Fujitsu Limited
- Yuji Tamura
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Optical amplifier
- Patent number 6,201,635
- Issue date Mar 13, 2001
- Fujitsu Limited
- Mikinori Yamanaka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical power monitor and optical amplifier having the optical powe...
- Patent number 5,859,725
- Issue date Jan 12, 1999
- Fujitsu Limited
- Hideaki Sugiya
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Auxiliary-signal transmission system
- Patent number 5,841,558
- Issue date Nov 24, 1998
- Fujitsu Limited
- Yuji Tamura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Control apparatus for optical amplifier
- Patent number 5,822,112
- Issue date Oct 13, 1998
- Fujitsu Limited
- Hiroyuki Itou
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Auxiliary-signal transmission system
- Patent number 5,798,857
- Issue date Aug 25, 1998
- Fujitsu Limited
- Yuji Tamura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical amplifier and optical transmission apparatus
- Patent number 5,680,246
- Issue date Oct 21, 1997
- Fujitsu Limited
- Tsukasa Takahashi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Auxiliary-signal transmission system
- Patent number 5,625,481
- Issue date Apr 29, 1997
- Fujitsu Limited
- Yuji Tamura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
OPTICAL TRANSMISSION SYSTEM AND OPTICAL RECEIVING APPARATUS
- Publication number 20150256251
- Publication date Sep 10, 2015
- Fujitsu Limited
- Yuji TAMURA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL AMPLIFYING DEVICE AND OPTICAL AMPLIFYING METHOD
- Publication number 20120236396
- Publication date Sep 20, 2012
- Fujitsu Limited
- Yuji TAMURA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL AMPLIFIER AND ABNORMALITY DETECTION METHOD FOR THE SAME
- Publication number 20090257115
- Publication date Oct 15, 2009
- FUJITSU LIMITED
- Kosuke KOMAKI
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL AMPLIFIER
- Publication number 20090213455
- Publication date Aug 27, 2009
- FUJITSU LIMITED
- Shinichirou MURO
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Optical amplifier
- Publication number 20080316591
- Publication date Dec 25, 2008
- FUJITSU LIMITED
- Tatsuya Tsuzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CONTROL OF A LIGHT SOURCE PROVIDING EXCITATION LIGHT
- Publication number 20080130098
- Publication date Jun 5, 2008
- FUJITSU LIMITED
- Toshihiro OHTANI
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical switch device and optical switching method
- Publication number 20060291867
- Publication date Dec 28, 2006
- FUJITSU LIMITED
- Yuji Tamura
- G02 - OPTICS
Information Patent Application
Signal light interruption detecting method and optical amplifier us...
- Publication number 20050218310
- Publication date Oct 6, 2005
- FUJITSU LIMITED
- Yuji Tamura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CONSTANT CURRENT DRIVING CIRCUIT
- Publication number 20050168269
- Publication date Aug 4, 2005
- FUJITSU LIMITED
- Yuji Tamura
- G05 - CONTROLLING REGULATING
Information Patent Application
Light amplification control unit and method
- Publication number 20040190122
- Publication date Sep 30, 2004
- FUJITSU LIMITED
- Tomoto Tanaka
- H01 - BASIC ELECTRIC ELEMENTS

Yuji Tamura

Person

Patents Grantslast 30 patents

Optical transmission system and optical receiving apparatus

Optical amplifying device and optical amplifying method

Optical amplifier

Multistage optical amplifier with gain control using pump ratio

Control of a light source providing excitation light

Optical amplifier and abnormality detection method for the same

Optical switch device and optical switching method

Signal light interruption detecting method and optical amplifier us...

Light amplification control unit and method

Constant current driving circuit

Optical amplifying apparatus, an optical output controlling method...

Optical amplifier

Optical power monitor and optical amplifier having the optical powe...

Auxiliary-signal transmission system

Control apparatus for optical amplifier

Auxiliary-signal transmission system

Optical amplifier and optical transmission apparatus

Auxiliary-signal transmission system

Patents Applicationslast 30 patents

OPTICAL TRANSMISSION SYSTEM AND OPTICAL RECEIVING APPARATUS

OPTICAL AMPLIFYING DEVICE AND OPTICAL AMPLIFYING METHOD

OPTICAL AMPLIFIER AND ABNORMALITY DETECTION METHOD FOR THE SAME

OPTICAL AMPLIFIER

Optical amplifier

CONTROL OF A LIGHT SOURCE PROVIDING EXCITATION LIGHT

Optical switch device and optical switching method

Signal light interruption detecting method and optical amplifier us...

CONSTANT CURRENT DRIVING CIRCUIT

Light amplification control unit and method