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    Gain and signal level adjustments of cascaded optical amplifiers
    2.
    发明授权
    Gain and signal level adjustments of cascaded optical amplifiers 有权
    级联光放大器的增益和信号电平调整

    公开(公告)号：US07969648B2

    公开(公告)日：2011-06-28

    申请号：US11406281

    申请日：2006-04-19

    申请人： Shinya Inagaki ,  Norifumi Shukunami ,  Susumu Kinoshita ,  Hiroyuki Itou ,  Taiki Kobayashi

    发明人： Shinya Inagaki ,  Norifumi Shukunami ,  Susumu Kinoshita ,  Hiroyuki Itou ,  Taiki Kobayashi

    IPC分类号： H01S3/00

    CPC分类号： H04B10/2942 ,  H01S3/06758 ,  H01S3/1301 ,  H01S3/1305 ,  H04B10/2912 ,  H04B10/2941 ,  H04B2210/003

    摘要： An optical amplification device which includes first and second optical amplifiers, and a controller. The first optical amplifier receives a light and amplifies the received light. The second optical amplifier receives the light amplified by the first optical amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation.

    摘要翻译： 一种包括第一和第二光放大器的光放大装置和控制器。 第一光放大器接收光并放大所接收的光。 第二光放大器接收由第一光放大器放大的光，并放大所接收的光。 当由第一光学放大器接收的光的电平改变＆Dgr时，控制器控制由第二光放大器接收的光的水平变化大约为＆Dgr。 在各种实施例中，控制器使得第一和第二光学放大器的增益之和恒定。 在其他实施例中，光放大装置包括第一和第二光放大器和增益调节器。 增益调节器检测第一光放大器的增益偏离目标增益，并调整第二光放大器的增益以补偿检测到的偏差。

    Optical amplification method and device usable with bands other than the C-band
    3.
    发明授权
    Optical amplification method and device usable with bands other than the C-band 有权

    公开(公告)号：US07480092B2

    公开(公告)日：2009-01-20

    申请号：US10647321

    申请日：2003-08-26

    申请人： Susumu Kinoshita ,  Shinya Inagaki

    发明人： Susumu Kinoshita ,  Shinya Inagaki

    IPC分类号： H04B10/17

    CPC分类号： H01S3/06754 ,  H01S3/10023 ,  H01S3/1301 ,  H01S2301/04

    摘要： An optical amplifier includes an optical amplification medium, an excitation source to stimulate the amplification medium to output at least one wavelength gain peak, and a gain equalizer to equalize the output of the amplification medium such that gain is produced at wavelengths other than the wavelength gain peak. The gain equalizer may attenuate gain at the peak wavelength. The gain equalizer may equalize the output of the amplification medium such that gain is produced at wavelengths less than the wavelength gain peak. The optical amplifier may include both a gain equalizer and automatic level control circuitry to respectively maintain substantially uniform gain at wavelengths within an optical signal band and maintain constant output power.

    OPTICAL AMPLIFIER
    4.
    发明申请
    OPTICAL AMPLIFIER 失效
    光放大器

    公开(公告)号：US20060087723A1

    公开(公告)日：2006-04-27

    申请号：US11045221

    申请日：2005-01-31

    申请人： Tomoaki Takeyama ,  Shinya Inagaki ,  Keiko Sasaki

    发明人： Tomoaki Takeyama ,  Shinya Inagaki ,  Keiko Sasaki

    IPC分类号： H01S3/00

    CPC分类号： H01S3/06758 ,  H01S3/0064 ,  H01S3/0078 ,  H01S3/06766 ,  H01S3/0677 ,  H01S3/0941 ,  H01S3/10069 ,  H01S3/1301 ,  H01S3/1305 ,  H01S3/1608 ,  H01S2301/02 ,  H01S2301/04 ,  H04B10/296 ,  H04B2210/003

    摘要： An optical amplifier of the invention comprises first and second optical amplification sections connected in a cascade manner between an input terminal and an output terminal. Optical isolators which block C-band ASE travelling in an opposite direction to L-band signal light, are inserted on the amplification medium of each of the optical amplification sections. A constant gain control section calculates the number of wavelengths based on the input power of signal light, and controls the pumping light power of each optical amplification section at a constant slope with respect to the number of wavelengths, so that the respective gains in the optical amplification sections corresponding to the number of wavelengths each become constant. As a result, it is possible to maintain flat gain wavelength characteristics even when receiving input of WDM light where the number of wavelengths varies rapidly over a wide range.

    摘要翻译： 本发明的光放大器包括在输入端和输出端之间以级联方式连接的第一和第二光放大部分。 将在与L波段信号光相反的方向上行进的C波段ASE的光隔离器插入每个光放大部分的放大介质上。 恒定增益控制部分根据信号光的输入功率来计算波长数，并且以相对于波长数量的恒定斜率控制每个光放大部分的泵浦光功率，使得光学部件 与波长数对应的放大部分各自变为恒定。 结果，即使当接收波长数量在宽范围内快速变化的WDM光的输入时，也可以保持平坦的增益波长特性。

    Optical amplifier and optical fiber applicable to optical amplifier
    6.
    发明授权
    Optical amplifier and optical fiber applicable to optical amplifier 失效
    光放大器和光纤适用于光放大器

    公开(公告)号：US6043930A

    公开(公告)日：2000-03-28

    申请号：US921015

    申请日：1997-08-29

    申请人： Shinya Inagaki

    发明人： Shinya Inagaki

    IPC分类号： H01S3/10 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/16 ,  G02B6/22

    CPC分类号： G02B6/03638 ,  H01S3/06708 ,  G02B6/02042 ,  H01S2303/00 ,  H01S3/094003 ,  H01S3/1608 ,  H01S3/1618

    摘要： An optical amplifier having an optical waveguide structure which includes a first region in which a first dopant (for example, Er) is doped in a first glass composition (for example, Al--Si glass) and a second region in which a second dopant (for example, Er) and a third dopant (for example, Yb) are doped in a second glass composition (for example, Al--P--Si glass). The first dopant is pumped so that the optical waveguide structure may provide a first gain characteristic determined by the first glass composition and the first dopant. The third dopant is pumped so that the optical waveguide structure may provide a second gain characteristic determined by the second glass composition and the second dopant. By selectively obtaining the first and second gain characteristics, where the optical amplifier is applied to WDM (wavelength division multiplexing), the output powers of optical signals of different channels can be controlled independently of each other.

    摘要翻译： 一种具有光波导结构的光放大器，其包括在第一玻璃组合物（例如，Al-Si玻璃）中掺杂有第一掺杂剂（例如，Er）的第一区域和第二区域，其中第二掺杂剂 例如，Er）和第三掺杂剂（例如，Yb）掺杂在第二玻璃组合物（例如，Al-P-Si玻璃）中。 泵浦第一掺杂剂，使得光波导结构可以提供由第一玻璃组合物和第一掺杂剂确定的第一增益特性。 泵浦第三掺杂剂，使得光波导结构可以提供由第二玻璃组合物和第二掺杂剂确定的第二增益特性。 通过选择性地获得将光放大器应用于WDM（波分复用）​​的第一和第二增益特性，可以彼此独立地控制不同信道的光信号的输出功率。

    Optical fiber amplifier/multiplexer
    8.
    发明授权
    Optical fiber amplifier/multiplexer 失效
    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.