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1. 发明授权

US5467218A Optical fiber amplifier 失效
标题翻译：光纤放大器
公开(公告)号：US5467218A
公开(公告)日：1995-11-14
申请号：US281998
申请日：1994-07-29
申请人： Keiko Takeda , Shinya Inagaki , Kenji Tagawa , Kazuya Sasaki
发明人： Keiko Takeda , Shinya Inagaki , Kenji Tagawa , Kazuya Sasaki
IPC分类号： H01S3/07 , H01S3/06 , H01S3/067 , H01S3/094 , H01S3/10 , H01S3/17
CPC分类号： H01S3/06708 , H01S3/06729 , H01S3/094003 , H01S3/094096
摘要： An optical fiber amplifier employs an optical fiber and an optical coupler. The optical fiber has a core and a clad. The core has an erbium-aluminum-doped center and an erbium-doped annular section. The optical coupler guides signal light and pump light to the optical fiber, which amplifies the signal light using the pump light. The center of the core corresponds to a section where the field diameter of the signal light overlaps that of the pump light. The annular section is outside the field diameter of the pump light. The amplifier provides a required gain without employing optical parts such as filters. The signal light has a wavelength in the 1.5-micrometer band, and the pump light has a wavelength, in the 1.45-micrometer band, corresponding to the absorption band of erbium. The present invention may further employ pump light having a wavelength in the 0.98-micrometer band. The optical fiber may be doped with erbium and aluminum only in an annular section around the center of the core, to prevent a gain drop near a wave length of 0.98 micrometers.
摘要翻译：光纤放大器采用光纤和光耦合器。光纤具有芯和包层。芯具有铒铝掺杂中心和掺铒环形部分。光耦合器将信号灯和泵浦光引导到光纤，光纤使用泵浦光放大信号光。芯的中心对应于信号光的场直径与泵浦光的直径重叠的部分。环形部分在泵浦光的场直径之外。放大器提供所需的增益，而不使用诸如滤波器之类的光学部件。信号光的波长为1.5微米，泵浦光的波长为1.45微米，与铒的吸收带相对应。本发明还可以使用波长在0.98微米波段的泵浦光。光纤可以仅在围绕芯的中心的环形部分中掺杂铒和铝，以防止在0.98微米波长附近的增益下降。

2. 发明授权

US5155621A Optical fiber amplifier 失效
标题翻译：光纤放大器
公开(公告)号：US5155621A
公开(公告)日：1992-10-13
申请号：US736932
申请日：1991-07-29
申请人： Keiko Takeda , Shinya Inagaki , Kenji Tagawa , Osamu Oyama
发明人： Keiko Takeda , Shinya Inagaki , Kenji Tagawa , Osamu Oyama
IPC分类号： H01S3/067
CPC分类号： H01S3/06758 , H01S2301/02
摘要： An optical fiber amplifier in which light generated within an Er doped optical fiber by spontaneous emission is eliminated or suppressed. By inserting a wavelength demultiplexer in the Er doped optical fiber, the light generated within the optical fiber by spontaneous emission can be effectively eliminated. As an alternative, the Er doped optical fiber is arranged in a coil form with a predetermined radius of curvature to thereby effectively eliminate light due to spontaneous emission on the longer wavelength side than the signal light. Further, by doping the center portion of the core of an optical fiber with aluminum and the whole body of the core uniformly with erbium, it is made possible to suppress the generation of light by spontaneous emission without causing an adverse effect on the amplification performance of the signal light.

3. 发明授权

US5140598A Fiber optic amplifier 失效
标题翻译：光纤放大器
公开(公告)号：US5140598A
公开(公告)日：1992-08-18
申请号：US701868
申请日：1991-05-17
申请人： Kenji Tagawa , Shinya Inagaki , Keiko Takeda
发明人： Kenji Tagawa , Shinya Inagaki , Keiko Takeda
IPC分类号： H01S3/13 , H04B10/291
CPC分类号： H04B10/291 , H01S3/1302 , H04B10/2912 , Y10S372/703
摘要： An optical fiber doped with Er is provided at its both end portions with a pair of 1.25 .mu.m band reflecting filters such that the distance therebetween becomes the resonator length for a light beam of 1.25 .mu.m band. When a pumping light beam of a wavelength of 0.8 .mu.m band is introduced into the optical fiber, laser oscillation at 1.25 .mu.m band is produced, whereby the energy level of Er in an excited state is lowered and a signal light beam of a wavelength of 1.55 .mu.m band can be optically amplified with high efficiency. Another fiber optic amplifier in which a pair of 0.98 .mu.m band reflecting filters are disposed at both end portions of an optical fiber doped with Yb and Er such that the distance therebetween becomes the resonator length for a light beam of 0.98 .mu.m band is also disclosed.

4. 发明授权

US5327282A Optical amplifier for 1.3 .mu.m band 失效
标题翻译：光放大器为1.3微米
公开(公告)号：US5327282A
公开(公告)日：1994-07-05
申请号：US26513
申请日：1993-03-04
申请人： Keiko Takeda , Shinya Inagaki , Kenji Tagawa
发明人： Keiko Takeda , Shinya Inagaki , Kenji Tagawa
IPC分类号： G02B6/00 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/094 , H01S3/10 , H01S3/16 , H01S3/17 , H01S3/00
CPC分类号： H01S3/06754 , H01S3/1613
摘要： Disclosed is an optical amplifier, wherein efficient optical amplification of signal light of 1.3 .mu.m band is made achievable by optically exiting a doped fiber doped with Pr (praseodymium) alone, or together with other rare earth element, or a similar optical waveguide arrangement, and then supplying the optical waveguide arrangement with the signal light.
摘要翻译：公开了一种光放大器，其中通过光学地离开掺杂有Pr（镨）的掺杂光纤，或与其它稀土元素或类似的光波导装置一起，可实现对1.3μm带的信号光的有效光放大，然后向光波导装置提供信号光。

5. 发明授权

US5276549A Optical transmitter including rare earth-doped fiber 失效
标题翻译：光发射机包括稀土掺杂光纤
公开(公告)号：US5276549A
公开(公告)日：1994-01-04
申请号：US945134
申请日：1992-09-15
申请人： Kenji Tagawa , Shinya Inagaki , Keiko Takeda , Osamu Oyama
发明人： Kenji Tagawa , Shinya Inagaki , Keiko Takeda , Osamu Oyama
IPC分类号： G02F1/35 , G02B6/42 , H01S3/00 , H01S3/067 , H01S3/0941 , H04B10/2507 , H04B10/40 , H04B10/50 , H04B10/60 , H01S3/14 , G02B6/00 , G02F1/09
CPC分类号： H01S3/067 , G02B6/4246 , H01S3/0064 , H01S3/06754 , H01S3/0941
摘要： A high-output optical transmitter including a rare earth-doped fiber. The optical transmitter includes a signal light source for outputting signal light having a first predetermined plane of polarization and a pumping light source for outputting pumping light having a second predetermined plane of polarization. The plane of polarization of the signal light from the signal light source is rotated 45 degrees by a Faraday rotator such that the plane of polarization of the signal light output from the Faraday rotator and the pumping light are perpendicular to each other. The signal light from the Faraday rotator and the pumping light from the pumping light source are polarization-coupled by a polarization coupler and the combined light is introduced into the rare earth-doped fiber.
摘要翻译：一种高输出光发射机，包括稀土掺杂光纤。光发射机包括用于输出具有第一预定偏振平面的信号光的信号光源和用于输出具有第二预定偏振平面的泵浦光的泵浦光源。来自信号光源的信号光的偏振平面通过法拉第旋转器旋转45度，使得从法拉第转子和泵浦光输出的信号光的偏振面彼此垂直。来自法拉第旋转器的信号光和来自泵浦光源的泵浦光通过偏振耦合器进行偏振耦合，并将组合的光引入稀土掺杂光纤中。

6. 发明授权

US5136420A Optical fiber amplifier 失效
公开(公告)号：US5136420A
公开(公告)日：1992-08-04
申请号：US541822
申请日：1990-06-21
申请人： Shinya Inagaki , Masayoshi Shigihara , Sakae Yoshizawa , Kazuya Sasaki , Keiko Takeda
发明人： Shinya Inagaki , Masayoshi Shigihara , Sakae Yoshizawa , Kazuya Sasaki , Keiko Takeda
IPC分类号： G02B6/255 , G02B6/28 , H01S3/094
CPC分类号： G02B6/2551 , G02B6/2835 , H01S3/094003 , H01S3/09408
摘要： An optical fiber amplifier is disclosed wherein pumping light and signal light are introduced into an optical fiber doped with a rare-earth element to directly amplify the signal light. The optical fiber amplifier of the invention comprises means constituted from a reflecting film, a fiber loop or the like for causing pumping light to pass by a plurality of times in the doped fiber. Due to the provision of the reflective film or the fiber loop, pumping light can be utilized efficiently, and the amplification factor of the optical fiber amplifier is improved.

7. 发明授权

US5007698A Optical fiber amplifier/multiplexer 失效
标题翻译：光纤放大器/多路复用器
公开(公告)号：US5007698A
公开(公告)日：1991-04-16
申请号：US567614
申请日：1990-08-15
申请人： Kazuya Sasaki , Sakae Yoshizawa , Shinya Inagaki , Keiko Takeda
发明人： Kazuya Sasaki , Sakae Yoshizawa , Shinya Inagaki , Keiko Takeda
IPC分类号： G02B6/28 , G02F1/35 , H01S3/06 , H01S3/063 , H01S3/17
CPC分类号： H01S3/063
摘要： An optical waveguide having a first cross section is thinned to constitute a thinned portion having a second cross section, as long as a predetermined length. Surface of the thinned portion is contacted with a laser glass member doped with a rare earth element, such as Er. Due to the thinned diameter, the optical fiber is optically coupled with the laser glass member. A pumping light is input to either into the optical waveguide together with a signal light or directly into the laser glass member. Signal light coupled from the thinned portion to the laser glass member is amplified by stimulated emission of the laser glass. Thus amplified signal light is coupled back to the thinned portion so as to propagate along the optical waveguide. The thinned portion can be as short as several centi-meters compared with ten meters to more than one hundred meters of conventional optical amplifier. In the optical waveguide where the pumping light is directly input to the laser glass member, the complicated multiplexer is not necessary, resulting in a reliable operation of the amplifier.

8. 发明授权

US5077815A Apparatus for optically connecting a single-mode optical fiber to a multi-mode optical fiber 失效
标题翻译：将单模光纤光纤连接到多模光纤的装置
公开(公告)号：US5077815A
公开(公告)日：1991-12-31
申请号：US411890
申请日：1989-09-25
申请人： Sakae Yoshizawa , Akihiko Ichikawa , Etsugo Yoneda , Shinya Inagaki , Kazuya Sasaki , Keiko Takeda
发明人： Sakae Yoshizawa , Akihiko Ichikawa , Etsugo Yoneda , Shinya Inagaki , Kazuya Sasaki , Keiko Takeda
IPC分类号： G02B6/14 , G02B6/255 , G02B6/26 , G02B6/32 , G02B6/38
CPC分类号： G02B6/2558 , G02B6/14 , G02B6/2551 , G02B6/262 , G02B6/32 , G02B6/3825 , G02B6/3833
摘要： An apparatus connects a single-mode optical fiber in a transmitting side to a multi-mode optical fiber in a receiving side without a deterioration of baseband transmission characteristics. The apparatus optically connects the single-mode fiber to the multi-mode fiber with an optical axes displacement therebetween, so that an optical signal to a multi-mode optical fiber from a single mode optical fiber is incident in a steady state mode including not only lower mode, but higher mode. In one embodiment, the optical axes displacement is achieved by axial displacement between the single-mode fiber and multi-mode fiber. In another embodiment, the optical axes displacement is achieved by an angle displacement between the single-mode fiber and multi-mode fiber.

9. 发明授权

US06748176B1 Optical dropping apparatus and optical add/drop multiplexer 失效
标题翻译：光学滴滴装置和光分插复用器
公开(公告)号：US06748176B1
公开(公告)日：2004-06-08
申请号：US09645881
申请日：2000-08-25
申请人： Shinya Inagaki , Keiko Takeda , Kaoru Moriya
发明人： Shinya Inagaki , Keiko Takeda , Kaoru Moriya
IPC分类号： H04J1402
CPC分类号： H04J14/0204 , H04J14/0205 , H04J14/0209 , H04J14/021 , H04J14/0213
摘要： An optical dropping apparatus and an optical add/drop multiplexer capable of dropping optical signals of an arbitrary wavelength from a WDM optical signal. The apparatus comprises a generating means for occurring four-wave mixing, a dropping means for dropping light of a predetermined wavelength, and a controlling means for controlling the wavelength of a pump light which is occurred four-wave mixing at the generating means. This apparatus is able to change the wavelength of the optical signals to be dropped, by changing the wavelength of the pump light.
摘要翻译：一种能够从WDM光信号中丢弃任意波长的光信号的光学丢弃装置和光分插复用器。该装置包括用于发生四波混频的发生装置，用于降低预定波长的光的下降装置，以及用于控制在发生装置处发生四波混频的泵浦光的波长的控制装置。该装置能够通过改变泵浦光的波长来改变要落下的光信号的波长。

10. 发明授权

US5764404A Wavelength-division-multiplexing optical amplifier 失效
标题翻译：波分复用光放大器
公开(公告)号：US5764404A
公开(公告)日：1998-06-09
申请号：US508471
申请日：1995-07-28
申请人： Kazuo Yamane , Michikazu Shima , Yumiko Kawasaki , Kenji Tagawa , Shinya Inagaki , Norifumi Shukunami
发明人： Kazuo Yamane , Michikazu Shima , Yumiko Kawasaki , Kenji Tagawa , Shinya Inagaki , Norifumi Shukunami
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/094 , H01S3/10 , H01S3/13 , H01S3/17 , H04B10/07 , H04B10/2537 , H04B10/296 , H04J14/00 , H04J14/02 , H01S3/16 , H04B10/12
CPC分类号： H04B10/296 , H01S3/1301 , H04B10/291 , H04B10/2942 , H04J14/0221 , H01S2302/00 , H01S2303/00 , H01S3/094096
摘要： 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 signals is minimized when the number of optical signals is two. The output level of the amplifier is controlled according to the number of the optical signals, to optimize the output level of each of the optical signals.
摘要翻译：光放大器放大由具有不同波长的光信号组成的波分复用光输入信号，使得每个光信号的输出电平始终被优化，并使得放大器在光信号上的增益之间的差最小化当光信号数为2时。根据光信号的数量控制放大器的输出电平，以优化每个光信号的输出电平。

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