1
Kazuo Yamane, Michikazu Shima, Yumiko Kawasaki, Kenji Tagawa, Shinya Inagaki, Norifumi Shukunami: Wavelength-division-multiplexing optical amplifier. Fujitsu, Helfgott & Karas P C, June 9, 1998: US05764404 (53 worldwide citation)

An optical amplifier amplifies a wavelength division-multiplexed optical input signal composed of optical signals having different wavelengths such that the output level of each of the optical signal is always optimized and such that the difference between the gains of the amplifier on the optical s ...


2
Miki Onaka, Susumu Kinoshita: Wavelength division multiplexing optical amplifier with function of gain-equalizing and optical communication system. Fujitsu, Staas & Halsey, March 19, 2002: US06359726 (27 worldwide citation)

An object of the invention is to provide a WDM optical amplifier and an optical communication system which can ensure wavelength flatness for gain across a wide range of input light power levels, and which can obtain noise characteristics with minimum wavelength dependency. Accordingly, the basic co ...


3
Onaka Miki, Kinoshita Susumu: Wavelength division multiplexing optical amplifier and optical communication system. Fujitsu, September 6, 2000: EP1033834-A2 (15 worldwide citation)

An object of the invention is to provide a WDM optical amplifier and an optical communication system which can ensure wavelength flatness for gain across a wide range of input light power levels, and which can obtain noise characteristics with minimum wavelength dependency. Accordingly, the basic co ...


4
Tetsuo Wada: Controlling apparatus and controlling method for wavelength division multiplexing optical amplifier. Fujitsu, Staas & Halsey, May 6, 2003: US06560008 (11 worldwide citation)

The present invention aims at providing a controlling apparatus and a controlling method for a wavelength division multiplexing optical amplifier to reduce the controlling error due to the affection of noise light included in the monitoring light to be used for controlling the wavelength division mu ...


5
Tajima Tsutomu, Chikuma Tadayuki: Wavelength-division-multiplexing optical amplifier device. Nippon Electric Co, January 7, 1998: EP0817415-A2 (8 worldwide citation)

Optical signals transmitted from optical transmission panels are received by photodetectors, which detect the number of actually transmitted optical signals. A control signal depending on the number of optical signals detected is supplied to an optical amplifier. The intensity of a combined optical ...


6
Yasuki Sakurai: Characteristic measuring method and characteristic measuring system of wavelength division multiplexing optical amplifier. Fujitsu, Staas & Halsey, June 15, 2004: US06751011 (5 worldwide citation)

The invention is directed to providing a characteristic measuring method and characteristic measuring system of a WDM optical amplifier that enables high speed and accurate measurement of characteristics of an optical amplifier by a measuring system with a simple construction. To this end, with the ...


7
Kazuo Yamane, Michikazu Shima, Yumiko Kawasaki, Kenji Tagawa, Shinya Inagaki, Norifumi Shukunami: Wavelength-division-multiplexing optical amplifier. Fujitsu, Helfgott & Karas P C, May 9, 2000: US06061173 (3 worldwide citation)

An optical amplifier amplifies a wavelength-division-multiplexed optical input signal composed of optical signals having different wavelengths such that the output level of each of the optical signal is always optimized and such that the difference between the gains of the amplifier on the optical s ...


8
Tetsuo Wada: Controlling apparatus and controlling method for wavelength division multiplexing optical amplifier. Fujitsu, Staas Y Halsey, March 22, 2005: US06870666 (2 worldwide citation)

A controlling apparatus and a controlling method for a wavelength division multiplexing optical amplifier to reduce the controlling error due to noise light included in the monitoring light. The controlling apparatus branches, by a photocoupler, a portion of WDM signal light amplified by a light lev ...


9
Tsutomu Tajima, Tadayuki Chikuma: Wavelength-division-multiplexing optical amplifier device and wavelength-division-multiplexing optical transmission system. NEC Corporation, Ostrolenk Faber Gerb & Soffen, November 30, 1999: US05995276 (1 worldwide citation)

Optical signals transmitted from optical transmission panels are received by photodetectors, which detect the number of actually transmitted optical signals. A control signal depending on the number of optical signals detected is supplied to an optical amplifier. The intensity of a combined optical ...


10
Yasuki Sakurai: Characteristic measuring method and characteristic measuring system of wavelength division multiplexing optical amplifier. Fujitsu, Staas & Halsey, December 12, 2002: US20020186454-A1 (1 worldwide citation)

The invention is directed to providing a characteristic measuring method and characteristic measuring system of a WDM optical amplifier that enables high speed and accurate measurement of characteristics of an optical amplifier by a measuring system with a simple construction. To this end, with the ...