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    Optical transmission system with reduced Kerr effect nonlinearities
    2.
    发明授权
    Optical transmission system with reduced Kerr effect nonlinearities 失效
    具有降低克尔效应非线性的光传输系统

    公开(公告)号：US06704519B1

    公开(公告)日：2004-03-09

    申请号：US09519654

    申请日：2000-03-06

    申请人： Igal M. Brener ,  Benny Peter Mikkelsen ,  Karsten Rottwitt ,  Jason Blain Stark

    发明人： Igal M. Brener ,  Benny Peter Mikkelsen ,  Karsten Rottwitt ,  Jason Blain Stark

    IPC分类号： H04B1000

    CPC分类号： H04B10/2543

    摘要： An optical transmission system is formed to include an optical phase conjugator at alternate repeater sites to minimize the presence of four-wave mixing and other Kerr effect nonlinearities in systems using optical fiber transmission paths (particularly in systems using DWDM and launching relatively high power signals into the low dispersion fiber). Raman gain is included in each fiber span (or in alternate fiber spans) so as to provide a “negative absorption” along the length of the fiber and thereby provide for essentially symmetrical power distribution along the length of each span, where the presence of such a symmetric,power distribution on each side of an optical phase conjugator has been found to significantly improve its performance.

    摘要翻译： 光传输系统被形成为在交替的中继器位置包括光相位共轭器，以最小化使用光纤传输路径的系统中四波混频和其他克尔效应非线性的存在（特别是在使用DWDM的系统中并且发射相对较高的功率信号 低分散纤维）。 拉曼增益被包括在每个纤维跨度（或在交替的纤维跨度）中，以沿着纤维的长度提供“负吸收”，从而提供沿着每个跨度的长度的基本上对称的功率分布，其中存在这样的 已经发现在光相位共轭器的每一侧上的对称的功率分布显着提高其性能。

    Multi-wavelength optical pump
    4.
    发明授权
    Multi-wavelength optical pump 失效
    多波长光泵

    公开(公告)号：US6122298A

    公开(公告)日：2000-09-19

    申请号：US742527

    申请日：1996-11-01

    申请人： Franklin W. Kerfoot, III ,  Howard D. Kidorf ,  Xiaobing Ma ,  Karsten Rottwitt

    发明人： Franklin W. Kerfoot, III ,  Howard D. Kidorf ,  Xiaobing Ma ,  Karsten Rottwitt

    IPC分类号： G02F1/35 ,  H01S3/06 ,  H01S3/094 ,  H01S3/30

    CPC分类号： H01S3/094003 ,  H01S2301/02 ,  H01S3/094096 ,  H01S3/302

    摘要： A high-powered optical pump includes at least two sub-pumps. Each sub-pump generates light at different wavelengths. The outputs of the sub-pumps are coupled to a remote pump fiber. The resulting light transmitted on the remote pump fiber results in a lower Raman gain and Raman noise spectral peak than that generated by existing single wavelength high-powered optical pumps at the same power level. Therefore, increased power can be transmitted on the remote pump fiber in contrast to a single wavelength pump. Additionally, the total gain spectrum available for the amplification of signals is increased.

    摘要翻译： 大功率光泵包括至少两个副泵。 每个子泵产生不同波长的光。 子泵的输出端连接到远程泵浦光纤。 在远程泵浦光纤上传输的所得光导致比在相同功率水平下由现有单波长大功率光泵产生的拉曼增益和拉曼噪声频谱峰值更低的拉曼增益和拉曼噪声频谱峰值。 因此，与单波长泵相反，可以在远程泵浦光纤上传输增加的功率。 此外，可用于信号放大的总增益谱增加。

    Optical fiber communication system employing doped optical fiber and Raman amplification
    5.
    发明授权
    Optical fiber communication system employing doped optical fiber and Raman amplification 有权
    采用掺杂光纤和拉曼放大的光纤通信系统

    公开(公告)号：US06711359B1

    公开(公告)日：2004-03-23

    申请号：US09266093

    申请日：1999-03-10

    申请人： Donald G. Duff ,  Howard D. Kidorf ,  Xiaobing Ma ,  Karsten Rottwitt

    发明人： Donald G. Duff ,  Howard D. Kidorf ,  Xiaobing Ma ,  Karsten Rottwitt

    IPC分类号： H04B1017

    CPC分类号： H04B10/297 ,  H04B10/2916

    摘要： A lightwave communication system is provided that includes first and second optical transmitters/receivers remotely located with respect to one another. First and second optical transmission paths couple the first transmitter/receiver to the second transmitter/receiver for bidirectionally transmitting optical information therebetween. First and second doped optical fibers are respectively disposed in the first and second optical transmission paths. Optical pump energy is supplied by first and second optical pump sources. The first optical pump source generates Raman gain in the first transmission path and the second optical pump source generates Raman gain in the second transmission path. A first optical coupler is provided for optically coupling pump energy from the first pump source to the second-doped optical fiber and a second optical coupler is provided for optically coupling pump energy from the second pump source to the first doped optical fiber.

    摘要翻译： 提供了一种光波通信系统，其包括相对于彼此远程定位的第一和第二光发射机/接收机。 第一和第二光传输路径将第一发射机/接收机耦合到第二发射机/接收机，用于双向传输光信息。 第一和第二掺杂光纤分别设置在第一和第二光传输路径中。 光泵浦能源由第一和第二光泵源提供。 第一光泵浦源在第一传输路径中产生拉曼增益，第二光泵浦源在第二传输路径中产生拉曼增益。 提供第一光耦合器用于将来自第一泵浦源的泵浦能量光耦合到第二掺杂光纤，并且提供第二光耦合器用于将来自第二泵浦源的泵浦能量光耦合到第一掺杂光纤。

    WDM optical communication system using co-propagating Raman amplification
    6.
    发明授权
    WDM optical communication system using co-propagating Raman amplification 有权
    WDM光通信系统采用共扩散拉曼放大

    公开(公告)号：US06417958B1

    公开(公告)日：2002-07-09

    申请号：US09768689

    申请日：2001-01-24

    申请人： Mei Du ,  Torben N. Nielsen ,  Karsten Rottwitt ,  Andrew John Stentz

    发明人： Mei Du ,  Torben N. Nielsen ,  Karsten Rottwitt ,  Andrew John Stentz

    IPC分类号： H01S300

    CPC分类号： H04B10/2916 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/302 ,  H04J14/02

    摘要： The use of a co-propagating fiber Raman amplifier in an optical WDM transmission system has been found to be practical in the situation where the fiber amplifier is operated into depletion and the characteristics of the input signals are controlled to exhibit a reduced integrated relative intensity noise (RIN) over the fiber crosstalk bandwidth. In particular, the reduction in the integrated RIN can be achieved by increasing the number of input channels (by adding more messages or simply using dummy channels), encoding the data in a particular fashion to reduce the integrated RIN, or decorrelating the plurality of N input signals below a predetermined, relatively low frequency (for example, 2 MHz).

    摘要翻译： 已经发现在光学WDM传输系统中使用共同传播的光纤拉曼放大器在光纤放大器被耗尽的情况下是实用的，并且输入信号的特性被控制以表现出降低的集成相对强度噪声 （RIN）超过光纤串扰带宽。 特别地，集成RIN的减少可以通过增加输入通道的数量（通过添加更多消息或简单地使用虚拟通道）来实现，以特定方式对数据进行编码以减少集成RIN，或者将多个N 输入信号低于预定的相对较低的频率（例如2MHz）。

    Reduction of four-wave mixing in raman amplified optical transmission systems
    8.
    发明授权
    Reduction of four-wave mixing in raman amplified optical transmission systems 有权
    在拉曼放大光传输系统中减少四波混频

    公开(公告)号：US06445492B1

    公开(公告)日：2002-09-03

    申请号：US09517864

    申请日：2000-03-03

    申请人： Torben N. Nielsen ,  Karsten Rottwitt ,  Andrew John Stentz

    发明人： Torben N. Nielsen ,  Karsten Rottwitt ,  Andrew John Stentz

    IPC分类号： H01S300

    CPC分类号： H04B10/2916 ,  H01S3/302 ,  H04B10/2563

    摘要： A Raman amplified transmission includes at least two pump sources to provide amplification to optical signals residing in the C-band (1530-1562 nm) and L-band (1574-1604 nm). The pump signals are chosen so as to provide for a relatively flat and wide composite gain spectrum with a width at least 50% greater than that generated by a monochromatic pump, while also chosen so as to prevent any four-wave mixing products from being in either the C- or L-bands.

    摘要翻译： 拉曼放大传输包括至少两个泵浦源，以对驻留在C波段（1530-1562nm）和L波段（1574-1604nm）内的光信号进行放大。 泵信号被选择为提供相对平坦且宽的复合增益谱，其宽度比由单色泵产生的宽度大至少50％，同时还被选择以防止任何四波混频产物处于 无论是C波段还是L波段。

    Wide bandwidth Raman amplifier employing a pump unit generating a plurality of wavelengths
    9.
    发明授权
    Wide bandwidth Raman amplifier employing a pump unit generating a plurality of wavelengths 失效
    宽带宽拉曼放大器采用产生多个波长的泵单元

    公开(公告)号：US06320884B1

    公开(公告)日：2001-11-20

    申请号：US09030994

    申请日：1998-02-26

    申请人： Franklin W. Kerfoot, III ,  Howard Kidorf ,  Xiaobing Ma ,  Karsten Rottwitt

    发明人： Franklin W. Kerfoot, III ,  Howard Kidorf ,  Xiaobing Ma ,  Karsten Rottwitt

    IPC分类号： H01S330

    CPC分类号： H01S3/302

    摘要： A Raman amplifier is provided that includes at least a portion of optical fiber in which an optical signal travels. The optical fiber portion may encompass all or part of the optical transmission path of an optical communication system. A pump energy unit is provided that includes first and second pump sources providing pump power at first and second wavelengths, respectively. The first and second wavelengths generate first and second gain profiles in the optical fiber portion. The first and second gain profiles overlap in wavelength. An optical coupler couples the pump power to the optical fiber portion. Since the gain profiles overlap, the Raman amplifier has a greater bandwidth than can be achieved with a pump operating at a single wavelength.

    摘要翻译： 提供了拉曼放大器，其包括光信号行进的光纤的至少一部分。 光纤部分可以包括光通信系统的全部或部分光传输路径。 提供了泵能量单元，其包括分别在第一和第二波长处提供泵浦功率的第一和第二泵浦源。 第一和第二波长在光纤部分中产生第一和第二增益分布。 第一和第二增益谱在波长上重叠。 光耦合器将泵浦功率耦合到光纤部分。 由于增益曲线重叠，拉曼放大器具有比在单个波长下工作的泵可实现的带宽更大的带宽。

    Method of apparatus for remotely pumping a rare-earth doped optical fiber amplifier and a communication system employing same
    10.
    发明授权
    Method of apparatus for remotely pumping a rare-earth doped optical fiber amplifier and a communication system employing same 有权
    用于远程泵浦稀土掺杂光纤放大器的装置的方法和采用它的通信系统

    公开(公告)号：US6141468A

    公开(公告)日：2000-10-31

    申请号：US250333

    申请日：1999-02-16

    申请人： Howard David Kidorf ,  Karsten Rottwitt

    发明人： Howard David Kidorf ,  Karsten Rottwitt

    IPC分类号： H04B10/17 ,  G02B6/28

    CPC分类号： H04B10/2916

    摘要： A method and apparatus is provided for providing pump energy to a doped optical fiber located along an optical transmission path. The doped optical fiber imparts amplification to an optical signal when pumped at a pump wavelength. In accordance with the method, pump energy is generated in the transmission fiber by introducing a power at a wavelength one Raman Stokes order below the desired pump wavelength. The pump energy is transmitted along the transmission path such that first order Raman Stokes-shifted light is applied to the doped optical fiber. For example, if the optical fiber is doped with erbium, which has a pump wavelength of about 1485 nm, pump energy is provided at a wavelength of 1390 nm.

    摘要翻译： 提供了一种方法和装置，用于向位于光传输路径的掺杂光纤提供泵浦能量。 当泵浦波长泵浦时，掺杂的光纤对光信号进行放大。 根据该方法，通过将波长为一拉曼斯托克斯次数的功率引入到低于期望的泵波长的范围内，在传输光纤中产生泵浦能量。 泵浦能量沿着传输路径传输，使得一阶拉曼斯托克斯位移的光被施加到掺杂的光纤。 例如，如果光纤掺杂有具有约1485nm的泵浦波长的铒，则在1390nm的波长处提供泵浦能量。