Tohru KAZAWA

Person

Kokubunji, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Passive optical network system, optical line terminal, and optical...
- Patent number 8,948,595
- Issue date Feb 3, 2015
- Hitachi, Ltd.
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical line terminal, bandwidth control method and optical network...
- Patent number 8,886,041
- Issue date Nov 11, 2014
- Hitachi, Ltd.
- Takahiro Tanaka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Burst-mode receiver equipped with optical amplifier, method for con...
- Patent number 8,861,954
- Issue date Oct 14, 2014
- Hitachi, Ltd.
- Jun Sugawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical multiplexing terminal device, wavelength multiplexing passi...
- Patent number 8,811,819
- Issue date Aug 19, 2014
- Hitachi, Ltd.
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical access system, optical network unit, and optical line terminal
- Patent number 8,798,460
- Issue date Aug 5, 2014
- Hitachi, Ltd.
- Satoshi Konno
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network system and operating method thereof
- Patent number 8,724,995
- Issue date May 13, 2014
- Hitachi, Ltd.
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Communication system and time synchronization method
- Patent number 8,712,244
- Issue date Apr 29, 2014
- Hitachi, Ltd.
- Makoto Hasegawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method of recovery from sleep state of an ONU in a PON system capab...
- Patent number 8,705,965
- Issue date Apr 22, 2014
- Hitachi, Ltd.
- Jun Sugawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
System apparatus and method for interconnecting TDM and frame/packe...
- Patent number 8,654,766
- Issue date Feb 18, 2014
- Hitachi, Ltd.
- Masahiko Mizutani
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical multiplexing terminating device, passive optical network sy...
- Patent number 8,532,491
- Issue date Sep 10, 2013
- Hitachi, Ltd.
- Norihiro Sakamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network system and operation method thereof
- Patent number 8,477,800
- Issue date Jul 2, 2013
- Hitachi, Ltd.
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Apparatus of adjusting optical signal transmission timing
- Patent number 8,467,684
- Issue date Jun 18, 2013
- Hitachi, Ltd.
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical access system
- Patent number 8,457,492
- Issue date Jun 4, 2013
- Hitachi, Ltd.
- Masaki Ohira
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network system and optical line terminal
- Patent number 8,374,503
- Issue date Feb 12, 2013
- Hitachi, Ltd.
- Norihiro Sakamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical communication system
- Patent number 8,374,504
- Issue date Feb 12, 2013
- Hitachi, Ltd.
- Masahiko Mizutani
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network (PON) system
- Patent number 8,331,400
- Issue date Dec 11, 2012
- Hitachi, Ltd.
- Masahiko Mizutani
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical access system
- Patent number 8,290,369
- Issue date Oct 16, 2012
- Hitachi, Ltd.
- Kenichi Sakamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical network system and method of changing encryption keys
- Patent number 8,280,055
- Issue date Oct 2, 2012
- Hitachi, Ltd.
- Taiki Nema
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network system and wavelength assignment method
- Patent number 8,260,135
- Issue date Sep 4, 2012
- Hitachi, Ltd.
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical communication system and optical line terminating apparatus
- Patent number 8,249,454
- Issue date Aug 21, 2012
- Hitachi, Ltd.
- Toshiki Sugawara
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network system and ranging method
- Patent number 8,249,455
- Issue date Aug 21, 2012
- Hitachi, Ltd.
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical communication system using WDMA and CDMA
- Patent number 8,224,135
- Issue date Jul 17, 2012
- Hitachi, Ltd.
- Masahiko Mizutani
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Bit synchronization circuit with phase tracking function
- Patent number 8,204,168
- Issue date Jun 19, 2012
- Hitachi, Ltd.
- Yusuke Yajima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
System apparatus and method for interconnecting TDM and frame/packe...
- Patent number 8,189,571
- Issue date May 29, 2012
- Hitachi, Ltd.
- Masahiko Mizutani
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network system and optical line terminator
- Patent number 8,184,975
- Issue date May 22, 2012
- Hitachi, Ltd.
- Masao Niibe
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network system and operating method thereof
- Patent number 8,184,976
- Issue date May 22, 2012
- Hitachi, Ltd.
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical line terminal capable of active bandwidth allocation for pa...
- Patent number 8,184,977
- Issue date May 22, 2012
- Hitachi, Ltd.
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network system, optical line terminator and optical...
- Patent number 8,145,055
- Issue date Mar 27, 2012
- Hitachi, Ltd.
- Masao Niibe
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network system, optical line terminator and, commun...
- Patent number 8,139,950
- Issue date Mar 20, 2012
- Hitachi, Ltd.
- Masao Niibe
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Passive optical network system and communication method therefor
- Patent number 8,107,824
- Issue date Jan 31, 2012
- Hitachi, Ltd.
- Akihiko Tsuchiya
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
PASSIVE OPTICAL NETWORK SYSTEM, OPTICAL LINE TERMINAL, AND OPTICAL...
- Publication number 20130148972
- Publication date Jun 13, 2013
- Hitachi, Ltd
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL LINE TERMINAL, BANDWIDTH CONTROL METHOD AND OPTICAL NETWORK...
- Publication number 20120308228
- Publication date Dec 6, 2012
- Hitachi, Ltd
- Takahiro TANAKA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
System Apparatus and Method for Interconnecting TDM and Frame/Packe...
- Publication number 20120219006
- Publication date Aug 30, 2012
- HITACHI, LTD.
- Masahiko MIZUTANI
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Burst-Mode Receiver Equipped with Optical Amplifier, Method for Con...
- Publication number 20120163809
- Publication date Jun 28, 2012
- Hitachi, Ltd
- Jun Sugawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL ACCESS SYSTEM, OPTICAL NETWORK UNIT, AND OPTICAL LINE TERMINAL
- Publication number 20120141119
- Publication date Jun 7, 2012
- Hitachi, Ltd.
- SATOSHI KONNO
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL MULTIPLEXING TERMINATING DEVICE, PASSIVE OPTICAL NETWORK SY...
- Publication number 20120106958
- Publication date May 3, 2012
- Hitachi, Ltd.
- Norihiro Sakamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL MULTIPLEXING TERMINATING DEVICE, WAVE-LENGTH MULTIPLEXING P...
- Publication number 20120093509
- Publication date Apr 19, 2012
- Hitachi, Ltd.
- Tohru KAZAWA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
COMMUNICATION SYSTEM AND TIME SYNCHRONIZATION METHOD
- Publication number 20120057865
- Publication date Mar 8, 2012
- Hitachi, Ltd
- Makoto HASEGAWA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
PASSIVE OPTICAL NETWORK SYSTEM AND OPERATING METHOD THEREOF
- Publication number 20120008948
- Publication date Jan 12, 2012
- HITACHI LTD.
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
PASSIVE OPTICAL NETWORK SYSTEM AND OPTICAL LINE TERMINAL
- Publication number 20110293274
- Publication date Dec 1, 2011
- Norihiro SAKAMOTO
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Method of Recovery From Sleep State of an Onu in a Pon System Capab...
- Publication number 20110211837
- Publication date Sep 1, 2011
- Hitachi, Ltd
- Jun Sugawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
PASSIVE OPTICAL NETWORK SYSTEM AND RANGING METHOD
- Publication number 20110200326
- Publication date Aug 18, 2011
- Tohru KAZAWA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
APPARATUS OF ADJUSTING OPTICAL SIGNAL TRANSMISSION TIMING
- Publication number 20110170871
- Publication date Jul 14, 2011
- Hitachi, Ltd
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL LINE TERMINAL CAPABLE OF ACTIVE BANDWIDTH ALLOCATION FOR PA...
- Publication number 20110091211
- Publication date Apr 21, 2011
- Hitachi, Ltd
- Tohru KAZAWA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL ACCESS SYSTEM
- Publication number 20100296811
- Publication date Nov 25, 2010
- Hitachi, Ltd
- Masaki Ohira
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
PASSIVE OPTICAL NETWORK SYSTEM AND OPERATION METHOD THEREOF
- Publication number 20100290783
- Publication date Nov 18, 2010
- Hitachi, Ltd
- Tohru KAZAWA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL LINE TERMINAL, PASSIVE OPTICAL NETWORK SYSTEM, AND BANDWIDT...
- Publication number 20100239255
- Publication date Sep 23, 2010
- Hiroki IKEDA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
PASSIVE OPTICAL NETWORK SYSTEM, OPTICAL LINE TERMINAL, AND OPTICAL...
- Publication number 20100221007
- Publication date Sep 2, 2010
- Hitachi, Ltd
- Kenichi Sakamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL NETWORK SYSTEM AND METHOD OF CHANGING ENCRYPTION KEYS
- Publication number 20100202612
- Publication date Aug 12, 2010
- Taiki Nema
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL COMMUNICATION SYSTEM USING WDMA AND CDMA
- Publication number 20100158527
- Publication date Jun 24, 2010
- Hitachi, Ltd
- Masahiko Mizutani
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Passive optical network (PON) system
- Publication number 20100150554
- Publication date Jun 17, 2010
- Hitachi, Ltd.
- Masahiko Mizutani
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
OPTICAL COMMUNICATION SYSTEM
- Publication number 20100086304
- Publication date Apr 8, 2010
- Hitachi Communication Technologies, Ltd.
- Masahiko Mizutani
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Passive Optical Network System and Operating Method Thereof
- Publication number 20100080558
- Publication date Apr 1, 2010
- Tohru Kazawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
PASSIVE OPTICAL NETWORK SYSTEM AND OPTICAL LINE TERMINATOR
- Publication number 20100067913
- Publication date Mar 18, 2010
- Masao Niibe
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
PON SYSTEM AND OPTICAL NETWORK UNIT
- Publication number 20100067910
- Publication date Mar 18, 2010
- Hitachi Communication Technologies, Ltd.
- Masahiko Mizutani
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
PASSIVE OPTICAL NETWORK SYSTEM, OPTICAL LINE TERMINATOR AND OPTICAL...
- Publication number 20100034534
- Publication date Feb 11, 2010
- Hitachi Communications Technologies, Ltd.
- Masao NIIBE
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Communication System, Optical Line Terminal, and Congestion Control...
- Publication number 20100020690
- Publication date Jan 28, 2010
- Kenta Komiya
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Optical communication system and optical line terminating apparatus
- Publication number 20090310964
- Publication date Dec 17, 2009
- Hitachi Communication Technologies, Ltd.
- Toshiki Sugawara
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
APPARATUS OF ADJUSTING OPTICAL SIGNAL TRANSMISSION TIMING
- Publication number 20090214211
- Publication date Aug 27, 2009
- Hitachi Communication Technologies, Ltd.
- Tohru KAZAWA
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Packet forwarding apparatus using token bucket algorithm and leaky...
- Publication number 20090210553
- Publication date Aug 20, 2009
- Hitachi Communication Technologies, Ltd.
- Masayuki Takase
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Tohru KAZAWA

Person

Patents Grantslast 30 patents

Passive optical network system, optical line terminal, and optical...

Optical line terminal, bandwidth control method and optical network...

Burst-mode receiver equipped with optical amplifier, method for con...

Optical multiplexing terminal device, wavelength multiplexing passi...

Optical access system, optical network unit, and optical line terminal

Passive optical network system and operating method thereof

Communication system and time synchronization method

Method of recovery from sleep state of an ONU in a PON system capab...

System apparatus and method for interconnecting TDM and frame/packe...

Optical multiplexing terminating device, passive optical network sy...

Passive optical network system and operation method thereof

Apparatus of adjusting optical signal transmission timing

Optical access system

Passive optical network system and optical line terminal

Optical communication system

Passive optical network (PON) system

Optical access system

Optical network system and method of changing encryption keys

Passive optical network system and wavelength assignment method

Optical communication system and optical line terminating apparatus

Passive optical network system and ranging method

Optical communication system using WDMA and CDMA

Bit synchronization circuit with phase tracking function

System apparatus and method for interconnecting TDM and frame/packe...

Passive optical network system and optical line terminator

Passive optical network system and operating method thereof

Optical line terminal capable of active bandwidth allocation for pa...

Passive optical network system, optical line terminator and optical...

Passive optical network system, optical line terminator and, commun...

Passive optical network system and communication method therefor

Patents Applicationslast 30 patents

PASSIVE OPTICAL NETWORK SYSTEM, OPTICAL LINE TERMINAL, AND OPTICAL...

OPTICAL LINE TERMINAL, BANDWIDTH CONTROL METHOD AND OPTICAL NETWORK...

System Apparatus and Method for Interconnecting TDM and Frame/Packe...

Burst-Mode Receiver Equipped with Optical Amplifier, Method for Con...

OPTICAL ACCESS SYSTEM, OPTICAL NETWORK UNIT, AND OPTICAL LINE TERMINAL

OPTICAL MULTIPLEXING TERMINATING DEVICE, PASSIVE OPTICAL NETWORK SY...

OPTICAL MULTIPLEXING TERMINATING DEVICE, WAVE-LENGTH MULTIPLEXING P...

COMMUNICATION SYSTEM AND TIME SYNCHRONIZATION METHOD

PASSIVE OPTICAL NETWORK SYSTEM AND OPERATING METHOD THEREOF

PASSIVE OPTICAL NETWORK SYSTEM AND OPTICAL LINE TERMINAL

Method of Recovery From Sleep State of an Onu in a Pon System Capab...

PASSIVE OPTICAL NETWORK SYSTEM AND RANGING METHOD

APPARATUS OF ADJUSTING OPTICAL SIGNAL TRANSMISSION TIMING

OPTICAL LINE TERMINAL CAPABLE OF ACTIVE BANDWIDTH ALLOCATION FOR PA...

OPTICAL ACCESS SYSTEM

PASSIVE OPTICAL NETWORK SYSTEM AND OPERATION METHOD THEREOF

OPTICAL LINE TERMINAL, PASSIVE OPTICAL NETWORK SYSTEM, AND BANDWIDT...

PASSIVE OPTICAL NETWORK SYSTEM, OPTICAL LINE TERMINAL, AND OPTICAL...

OPTICAL NETWORK SYSTEM AND METHOD OF CHANGING ENCRYPTION KEYS

OPTICAL COMMUNICATION SYSTEM USING WDMA AND CDMA

Passive optical network (PON) system

OPTICAL COMMUNICATION SYSTEM

Passive Optical Network System and Operating Method Thereof

PASSIVE OPTICAL NETWORK SYSTEM AND OPTICAL LINE TERMINATOR

PON SYSTEM AND OPTICAL NETWORK UNIT

PASSIVE OPTICAL NETWORK SYSTEM, OPTICAL LINE TERMINATOR AND OPTICAL...

Communication System, Optical Line Terminal, and Congestion Control...

Optical communication system and optical line terminating apparatus

APPARATUS OF ADJUSTING OPTICAL SIGNAL TRANSMISSION TIMING

Packet forwarding apparatus using token bucket algorithm and leaky...