Issued Patents All Time
Showing 51–75 of 75 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6647211 | REMOTE CONTROL DEVICE OF ACOUSTO-OPTIC TUNABLE FILTER AND OPTICAL TRANSMISSION SYSTEM CONTAINING EQUALIZER USING ACOUSTO-OPTIC TUNABLE FILTER AND OPTICAL TRANSMISSION SYSTEM CONTAINING OPTICAL ADD/DROP MULTIPLEXER USING ACOUSTO-OPTIC TUNABLE FILTER | Terumi Chikama | 2003-11-11 |
| 6580551 | Method for gain equalization, and device and system for use in carrying out the method | — | 2003-06-17 |
| 6535309 | Optical multiplexing/demultiplexing apparatus and optical multiplexing/demultiplexing method | — | 2003-03-18 |
| 6512628 | Distributed optical amplifier, amplifying method, and optical communication system | Takeshi Hoshida | 2003-01-28 |
| 6501592 | Optical amplifier reflecting spontaneous emission back into the amplifier to improve efficiency | — | 2002-12-31 |
| 6493129 | Tunable optical filter | Nobuhiro Fukushima | 2002-12-10 |
| 6452701 | Wavelength division multiplexing communications network supervisory system | Takeo Osaka, Shin-ichirou Harasawa | 2002-09-17 |
| 6381064 | Method for gain equalization, and device and system for use in carrying out the method | — | 2002-04-30 |
| 6366379 | REMOTE CONTROL DEVICE OF ACOUSTO-OPTIC TUNABLE FILTER AND OPTICAL TRANSMISSION SYSTEM CONTAINING EQUALIZER USING ACOUSTO-OPTIC TUNABLE FILTER AND OPTICAL TRANSMISSION SYSTEM CONTAINING OPTICAL ADD/DROP MULTIPLEXER USING ACOUSTO-OPTIC TUNABLE FILTER | Terumi Chikama | 2002-04-02 |
| 6344914 | Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier | Naomasa Shimojoh, Terumi Chikama | 2002-02-05 |
| 6339492 | Tunable optical filter | Nobuhiro Fukushima | 2002-01-15 |
| 6307656 | Bi-directional wavelength switching device and wavelength demultiplexing/multiplexing device | — | 2001-10-23 |
| 6271945 | Apparatus and method for controlling power levels of individual signal lights of a wavelength division multiplexed signal light | — | 2001-08-07 |
| 6222655 | Wavelength division multiplex optical amplification transmission system and optical amplifier | — | 2001-04-24 |
| 6219176 | Method for gain equalization, and device and system for use in carrying out the method | — | 2001-04-17 |
| 6211980 | Bi-directional wavelength switching device and wavelength demultiplexing/multiplexing device | — | 2001-04-03 |
| 6134034 | Apparatus and method for controlling power levels of individual signal lights of a wavelength division multiplexed signal light | — | 2000-10-17 |
| 6097535 | Method for optical amplification and system for carrying out the method | — | 2000-08-01 |
| 6061157 | Optical wavelength multiplexing and demultiplexing device and an optical transmission system using the same | — | 2000-05-09 |
| 6061172 | Active optical fiber and optical fiber amplifier | Takao Naito, Naomasa Shimojoh | 2000-05-09 |
| 6052221 | Optical receiver having a function for suppressing useless intensity modulation components | — | 2000-04-18 |
| 5841557 | Method and apparatus for scrambling the polarization of signal lights forming a wavelength division multiplexed signal light | Kazue Otsuka, Hiroshi Onaka, Takao Naito | 1998-11-24 |
| 5841571 | Optical receiver having a function for suppressing useless intensity modulation components | — | 1998-11-24 |
| 5729372 | Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system | Terumi Chikama, Masuo Suyama, Takao Naito | 1998-03-17 |
| 5539566 | Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system | Terumi Chikama, Masuo Suyama, Takao Naito | 1996-07-23 |