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1. 发明授权

US06785472B1 Broadband amplified WDM ring 失效
标题翻译：宽带放大WDM环
公开(公告)号：US06785472B1
公开(公告)日：2004-08-31
申请号：US09334047
申请日：1999-06-15
申请人： Laura Ellen Adams , Jon Anderson , Robert Mario Broberg , David John DiGiovanni , Karsten Rottwitt
发明人： Laura Ellen Adams , Jon Anderson , Robert Mario Broberg , David John DiGiovanni , Karsten Rottwitt
IPC分类号： H04J1402
CPC分类号： H04B10/27 , H04B10/2755 , H04B10/2916 , H04B10/2939 , H04J14/0206 , H04J14/0221
摘要： A fiber-optic WDM ring carries communication traffic among a plurality of nodes, each node associated with respective subscriber premises. Remote gain is provided in at least one link of the ring. In specific embodiments of the invention, the remote gain is applied preferentially to those wavelength channels most in need of amplification. In specific embodiments of the invention, the remote gain is Raman gain.
摘要翻译：光纤WDM环承载多个节点之间的通信业务，每个节点与相应的用户房屋相关联。在环的至少一个链路上提供远程增益。在本发明的具体实施例中，远程增益优先地应用于最需要放大的那些波长信道。在本发明的具体实施例中，远程增益是拉曼增益。

2. 发明授权

US06704519B1 Optical transmission system with reduced Kerr effect nonlinearities 失效
标题翻译：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。

3. 发明授权

US06384963B2 Optical communication system with co-propagating pump radiation for raman amplification 有权
标题翻译：具有共同传播泵浦辐射的光通信系统用于拉曼放大
公开(公告)号：US06384963B2
公开(公告)日：2002-05-07
申请号：US09769083
申请日：2001-01-25
申请人： David Ackerman , Kenneth L. Bacher , William Dautremont-Smith , Mei Du , Karsten Rottwitt , Andrew John Stentz , Thomas A. Strasser , Liming Zhang
发明人： David Ackerman , Kenneth L. Bacher , William Dautremont-Smith , Mei Du , Karsten Rottwitt , Andrew John Stentz , Thomas A. Strasser , Liming Zhang
IPC分类号： H01S300
CPC分类号： H04B10/2916 , H01S3/06754 , H01S3/094003 , H01S3/09408 , H01S3/094096 , H01S3/302 , H01S5/1096 , H01S2301/03
摘要： A fiber Raman amplifier is configured to use a co-propagating Raman pump source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems). By carefully configuring the pump source characteristics, sufficient optical gain can be achieved in the co-propagating arrangement, the characteristics including: (1) using an optical pump power of at least 50 mW, (2) having a relatively large spectral bandwidth within the pump (to suppress SBS); and (3) a frequency difference between all longitudinal pump modes of each pump laser being separated by at least the walk-off frequency between the pump laser frequency and the signal frequency, and all intense longitudinal modes between different pump lasers being separated by at least the electrical bandwidth of the communication system.
摘要翻译：光纤拉曼放大器被配置为使用共同传播的拉曼泵浦源，其可以在各种系统配置（例如，在双向通信系统中）是有益的。通过仔细配置泵浦源特性，可以在共同传播装置中实现足够的光学增益，其特征包括：（1）使用至少50mW的光泵浦功率，（2）在泵（以抑制SBS）; 和（3）每个泵浦激光器的所有纵向泵浦模式之间的频率差异至少被分离为泵浦激光器频率和信号频率之间的离散频率，并且不同泵浦激光器之间的所有强烈纵向模式至少被分离通信系统的电气带宽。

4. 发明授权

US6122298A Multi-wavelength optical pump 失效
标题翻译：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。

5. 发明授权

US06711359B1 Optical fiber communication system employing doped optical fiber and Raman amplification 有权
标题翻译：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。

6. 发明授权

US06417958B1 WDM optical communication system using co-propagating Raman amplification 有权
标题翻译： 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）。

7. 发明授权

US06363194B1 Optical fiber communication system employing Nd doped fiber amplifier for the 1400 nm window 有权
标题翻译：用于1400nm窗口的采用Nd掺杂光纤放大器的光纤通信系统
公开(公告)号：US06363194B1
公开(公告)日：2002-03-26
申请号：US09288201
申请日：1999-04-08
申请人： David John DiGiovanni , Karsten Rottwitt
发明人： David John DiGiovanni , Karsten Rottwitt
IPC分类号： G02B602
CPC分类号： H01S3/06708 , H01S3/06729 , H01S3/1611 , H01S3/1698 , H01S2301/04 , H01S2302/00 , H01S2303/00
摘要： In accordance with the invention, an optical fiber communication system comprises one or more Nd doped fiber amplifiers for amplified transmission in the 1400 nm window. The amplifier is designed with a combination of waveguide effects and selective absorption to reduce amplified spontaneous emission to acceptable levels.
摘要翻译：根据本发明，光纤通信系统包括在1400nm窗口中用于放大传输的一个或多个Nd掺杂光纤放大器。放大器设计有波导效应和选择性吸收的组合，以将放大的自发辐射减少到可接受的水平。

8. 发明授权

US06445492B1 Reduction of four-wave mixing in raman amplified optical transmission systems 有权
标题翻译：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。

9. 发明授权

US06320884B1 Wide bandwidth Raman amplifier employing a pump unit generating a plurality of wavelengths 失效
标题翻译：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。

10. 发明授权

US6141468A Method of apparatus for remotely pumping a rare-earth doped optical fiber amplifier and a communication system employing same 有权
标题翻译：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。

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