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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Kosaka; Junya
Address:
Fujisawa, JP
No. of patents:
28
Patents:












Patent Number Title Of Patent Date Issued
6859308 Optical amplifier February 22, 2005
An optical amplifier which amplifies a multiplexed signal light which is multiplexed with a plurality of signals having different wavelengths. The optical amplifier includes an optical amplifying medium which amplifies the multiplexed signal light and outputs amplified multiplexed signal
6839161 Optical amplification apparatus January 4, 2005
An optical amplification apparatus for adjusting optical power of wavelength-multiplexed signal light at respective wavelengths and for adjusting the optical output power at the respective wavelengths and a deviation of the optical output power between the wavelengths. An optical pow
6836587 Optical transmission device and optical transmission system employing the same December 28, 2004
An optical transmission device which reduces optical noise in an optical transmission system. The optical transmission device includes a core light amplifying unit, and a first buffer light amplifying unit for amplifying a first signal light from a first transmission path and an amplifie
6671431 Optical transmission device and optical transmission system employing the same December 30, 2003
An optical transmission device which reduces optical noise in an optical transmission system. The optical transmission device includes a core light amplifying unit and a first buffer light amplifying unit for amplifying a first signal light from a first transmission path and an amplified
6671084 Optical amplifier December 30, 2003
An optical amplifier includes an optical amplifying medium having a multiplexed light input thereto and providing an output of amplified multiplexed light, an excitation source which excites the optical amplifying medium; and at least one of a first monitor for monitoring the amplifi
6532103 Optical fiber amplifier and optical transmission system using the same March 11, 2003
A variable attenuator is inserted into an optical input part and a feedback control is performed so that an optical input to an amplifying optical fiber becomes constant. Further, a control for changing a total optical output and an optical input to the amplifying optical fiber is perfor
6525871 Optical amplification apparatus February 25, 2003
An optical amplification apparatus for adjusting optical power of wavelength-multiplexed signal light at respective wavelengths and for adjusting the optical output power at the respective wavelengths and a deviation of the optical output power between the wavelengths. An optical pow
6490387 Optical transmission device and optical transmission system employing the same December 3, 2002
An optical transmission device which reduces optical noise in an optical transmission system. The optical transmission device includes a core light amplifying unit, and a first buffer light amplifying unit for amplifying a first signal light from a first transmission path and an amplifie
6483630 OPTICAL AMPLIFIER, METHOD OF CONTROLLING THE OUTPUT LIGHT FROM THE OPTICAL AMPLIFIER, OPTICAL TR November 19, 2002
A method of controlling an output of an optical amplifier which amplifies a multiplexed light ray propagated through a transmission path in an optical transmission system and which includes a probe light beam and other light beams. The method includes utilizing a rare earth added optical
6459527 Optical amplifier apparatus and control method thereof, and optical transmission system using op October 1, 2002
A control method of an optical amplifier apparatus for compensating a gain characteristic of an optical amplifying medium. The control method includes providing an active gain characteristic actively which is a reverse of a characteristic in gain of the optical amplifying medium, and
6433925 Optical fiber amplifier and optical transmission system using the same August 13, 2002
A variable attenuator is inserted into an optical input part and a feedback control is performed so that an optical input to an amplifying optical fiber becomes constant. Further, a control for changing a total optical output and an optical input to the amplifying optical fiber is perfor
6373622 Optical amplification apparatus April 16, 2002
An optical amplification apparatus for adjusting optical power of wavelength-multiplexed signal light at respective wavelengths and for adjusting the optical output power at the respective wavelengths and a deviation of the optical output power between the wavelengths. An optical pow
6314217 Optical transmission device and optical transmission system employing the same November 6, 2001
An optical transmission device which reduces optical noise in an optical transmission system. The optical transmission device includes a core light amplifying unit, and a first buffer light amplifying unit for amplifying a first signal light from a first transmission path and an amplifie
6297902 Light amplification medium control method, light amplification apparatus and system using the sa October 2, 2001
In a light amplification apparatus in which a part of a light output from a light amplification medium is transmitted through a branching means to a light detection means so that light power of the light output is detected by the light detection means whereby at least one of an excitatio
6262835 Optical amplifier unit control methods, optical amplifier systems and systems which use the meth July 17, 2001
An optical amplifier controlling method and optical amplifier system which are simple in composition, maintain the S/N ratio of an optical signal output, have high control responsiveness, suppress the generation of a light surge, and amplify the optical signal, and a system using the met
6256141 Optical amplification apparatus July 3, 2001
An optical amplification apparatus for adjusting optical power of wavelength-multiplexed signal light at respective wavelengths and for adjusting the optical output power at the respective wavelengths and a deviation of the optical output power between the wavelengths. An optical pow
6233091 Optical amplifier unit control methods, optical amplifier systems and systems which use the meth May 15, 2001
An optical amplifier controlling method and optical amplifier system which are simple in composition, maintain the S/N ratio of an optical signal output, have high control responsiveness, suppress the generation of a light surge, and amplify the optical signal, and a system using the met
6229641 Optical amplifier, method of controlling the output light from the optical amplifier, optical tr May 8, 2001
An optical transmission path monitoring and controlling method including the steps of monitoring a probe light beam and other multiplexed light beams which are included in a multiplex light ray propagated through a transmission path in an optical transmission system, detecting values of
6195480 Optical transmission device and optical transmission system employing the same February 27, 2001
An optical transmission device which reduces optical noise in an optical transmission system. The optical transmission device includes a core light amplifying unit, and a first buffer light amplifying unit for amplifying a first signal light from a first transmission path and an amplifie
6094296 Optical amplification apparatus July 25, 2000
An optical amplification apparatus for adjusting optical power of wavelength-multiplexed signal light at respective wavelengths and for adjusting the optical output power at the respective wavelengths and a deviation of the optical output power between the wavelengths. An optical pow
6091539 Optical amplifier apparatus and control method thereof, and optical transmission system using op July 18, 2000
An optical amplifier apparatus, for amplifying inputted multiplexed optical signals, comprising:optical adjusting means for adjusting the inputted multiplexed optical signals in optical power thereof with a certain characteristic of gain;optical amplifying means for amplifying the optical po
6078422 Optical amplifier unit control methods optical amplifier systems and systems which use the metho June 20, 2000
An optical amplifier controlling method and optical amplifier system which are simple in composition, maintain the S/N ratio of an optical signal output, have high control responsiveness, suppress the generation of a light surge, and amplify the optical signal, and a system using the met
6038062 Optical amplifier, method of controlling the output light from the optical amplifier, optical tr March 14, 2000
In an optical amplifier, multiplexed light beams inputted to an optical amplifying medium are guided and the optical amplifying medium is excited by an exciting source to change the mu-factor. Part of multiplexed light beams amplified by the optical amplifying medium are branched by an
5986800 Optical amplification apparatus November 16, 1999
An optical amplification apparatus for adjusting optical power of wavelength-multiplexed signal light at respective wavelengths and for adjusting the optical output power at the respective wavelengths and a deviation of the optical output power between the wavelengths. An optical pow
5943162 Optical amplifier, optical amplifying method and optical transmission system using the optical a August 24, 1999
An optical amplifier including an input unit, a polarization maintaining optical amplifying unit, an exciting unit and an output unit. The input unit enables receiving a first signal light in a first polarization state and a second signal light in a second polarization state different fr
5864423 Optical amplifier, method of controlling the output light from the optical amplifier, optical tr January 26, 1999
In an optical amplifier 8 or 10, multiplexed light beams inputted to an optical amplifying medium 19 are guided and the optical amplifying medium 19 is excited by an exciting source 21 to change the mu-factor. Part of multiplexed light beams amplified by the optical amplifying medium 19
5835260 Optical amplifier, optical amplifying method and optical transmission system using the optical a November 10, 1998
An optical amplifier including an input unit, a polarization maintaining optical amplifying unit, an exciting unit and an output unit. The input unit enables receiving a first signal light in a first polarization state and a second signal light in a second polarization state different fr
5675432 Optical amplification apparatus October 7, 1997
An optical amplification apparatus for adjusting optical power of wavelength-multiplexed signal light at respective wavelengths and for adjusting the optical output power at the respective wavelengths and a deviation of the optical output power between the wavelengths. An optical pow










 
 
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