| Patent | Date |
|---|
Optical amplifier having various control circuitry
Grant 6,867,908 - Uemura , et al. March 15, 2 | 2005-03-15 |
Optical amplifier having various control circuitry
App 20030184850 - Uemura, Aritomo ; et al. | 2003-10-02 |
Optical amplifier having various control circuitry
Grant 6,614,588 - Uemura , et al. September 2, 2 | 2003-09-02 |
Optical repeater monitoring system and a method thereof
Grant 6,556,325 - Horiuchi , et al. April 29, 2 | 2003-04-29 |
Optical amplifying transmission system and optical amplifying repeater
Grant 6,188,510 - Edagawa , et al. February 13, 2 | 2001-02-13 |
Wavelength division multiplexed optical processing device and optical communication transmission path
Grant 6,181,449 - Taga , et al. January 30, 2 | 2001-01-30 |
Optical power measuring system terminal station and repeater therefor
Grant 6,160,649 - Horiuchi , et al. December 12, 2 | 2000-12-12 |
Gain equalizing apparatus
Grant 6,091,538 - Takeda , et al. July 18, 2 | 2000-07-18 |
Optical transmission device, WDM optical transmission apparatus, and optical transmission system using return-to-zero optical pulses
Grant 6,005,702 - Suzuki , et al. December 21, 1 | 1999-12-21 |
Optical add-drop multiplexer
Grant 5,926,300 - Miyakawa , et al. July 20, 1 | 1999-07-20 |
Optical transmission line
Grant 5,912,750 - Takeda , et al. June 15, 1 | 1999-06-15 |
Optical receiver device for dark soliton lightwave
Grant 5,892,608 - Suzuki , et al. April 6, 1 | 1999-04-06 |
Optical modulator, optical short pulse generating device, optical waveform shaping device, and optical demultiplexer device
Grant 5,889,607 - Suzuki , et al. March 30, 1 | 1999-03-30 |
Surveillance method of optical amplifier-repeater transmission system
Grant 5,877,878 - Horiuchi , et al. March 2, 1 | 1999-03-02 |
Optical frequency shifter and optical soliton-like return-to-zero pulse transmission system using optical frequency shifter
Grant 5,864,421 - Suzuki , et al. January 26, 1 | 1999-01-26 |
WDM optical communication method with pre-emphasis technique and an apparatus therefor
Grant 5,790,289 - Taga , et al. August 4, 1 | 1998-08-04 |
Line monitoring method and line monitoring apparatus
Grant 5,790,294 - Horiuchi , et al. August 4, 1 | 1998-08-04 |
Optical communication system and optical transmitting device
Grant 5,786,918 - Suzuki , et al. July 28, 1 | 1998-07-28 |
Gain-controllable optical amplifier and optical gain-control method
Grant 5,710,660 - Yamamoto , et al. January 20, 1 | 1998-01-20 |
Soliton optical communication system and optical transmitter and optical receiver therefor
Grant 5,625,479 - Suzuki , et al. April 29, 1 | 1997-04-29 |
Wavelength division multiplexed optical fiber transmission equipment
Grant 5,589,969 - Taga , et al. December 31, 1 | 1996-12-31 |
Optical amplifying transmitting system
Grant 5,574,590 - Edagawa , et al. November 12, 1 | 1996-11-12 |
Wavelength division multiplexed optical fiber transmission equiptment
Grant 5,559,910 - Taga , et al. September 24, 1 | 1996-09-24 |
Quantum well structure and semiconductor device using the same
Grant 5,122,844 - Akiba , et al. June 16, 1 | 1992-06-16 |
Method for the manufacture of optical semiconductor device
Grant 5,019,519 - Tanaka , et al. May 28, 1 | 1991-05-28 |
Pn junction optical modulating device having a buffer layer with small energy gap
Grant 4,991,921 - Suzuki , et al. February 12, 1 | 1991-02-12 |
Distributed feedback semiconductor laser device and current injection
Grant 4,932,034 - Usami , et al. June 5, 1 | 1990-06-05 |
Infrared emitting device with dislocation free layer
Grant 4,918,496 - Matsushima , et al. April 17, 1 | 1990-04-17 |
Variable-waveguide optical branching filter
Grant 4,874,216 - Utaka , et al. October 17, 1 | 1989-10-17 |
Method for manufacturing semiconductor optical integrated device with optical waveguide regions
Grant 4,820,655 - Noda , et al. April 11, 1 | 1989-04-11 |
Distributed feedback semiconductor laser with monitor
Grant 4,815,090 - Usami , et al. March 21, 1 | 1989-03-21 |
Semiconductor integrated light emitting device
Grant 4,811,352 - Suzuki , et al. March 7, 1 | 1989-03-07 |
Semiconductor device with distributed bragg reflector
Grant 4,796,274 - Akiba , et al. January 3, 1 | 1989-01-03 |
Light emitting device
Grant 4,773,075 - Akiba , et al. September 20, 1 | 1988-09-20 |
Method of manufacturing avalanche photo diode
Grant 4,761,383 - Matsushima , et al. August 2, 1 | 1988-08-02 |
Optical external modulation semiconductor element
Grant 4,743,087 - Utaka , et al. May 10, 1 | 1988-05-10 |
Avalanche photo diode with quantum well layer
Grant 4,731,641 - Matsushima , et al. March 15, 1 | 1988-03-15 |
Integrated semiconductor light emitting element with oscillation wavelength and phase modulated light output
Grant 4,720,835 - Akiba , et al. January 19, 1 | 1988-01-19 |
Distributed feedback semiconductor laser
Grant 4,701,930 - Akiba , et al. October 20, 1 | 1987-10-20 |
Multi-layered semi-conductor photodetector
Grant 4,682,196 - Sakai , et al. July 21, 1 | 1987-07-21 |
Method for manufacturing diffraction grating
Grant 4,660,934 - Akiba , et al. April 28, 1 | 1987-04-28 |
Distributed feedback semiconductor laser with monitor
Grant 4,653,058 - Akiba , et al. March 24, 1 | 1987-03-24 |
Distributed feedback semiconductor laser
Grant 4,648,096 - Akiba , et al. March 3, 1 | 1987-03-03 |
Distributed feedback semiconductor laser
Grant 4,573,158 - Utaka , et al. February 25, 1 | 1986-02-25 |
Semiconductor laser
Grant 4,573,161 - Sakai , et al. February 25, 1 | 1986-02-25 |
Distributed feedback semiconductor laser
Grant 4,553,239 - Akiba , et al. November 12, 1 | 1985-11-12 |
Distributed feedback semiconductor laser
Grant 4,516,243 - Utaka , et al. May 7, 1 | 1985-05-07 |
Distributed feedback semiconductor laser
Grant 4,506,367 - Akiba , et al. March 19, 1 | 1985-03-19 |
Avalanche photo diode
Grant 4,383,266 - Sakai , et al. May 10, 1 | 1983-05-10 |
Semiconductor laser with buffer layer
Grant 4,340,966 - Akiba , et al. July 20, 1 | 1982-07-20 |
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