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公开(公告)号：US06532330B1
公开(公告)日：2003-03-11
申请号：US09596454
申请日：2000-06-19
IPC分类号： G02B602
CPC分类号： G02B6/29376 , H04B10/25253
摘要： Techniques are described for constructing an optical fiber transmission line having a desired length and path-average dispersion, while also having a desired total ∂ D ∂ λ . In one approach, a first fiber is selected with a first dispersion and ∂ D ∂ λ , and a second fiber is selected with a second dispersion and ∂ D ∂ λ having a sign opposite to that of the dispersion and ∂ D ∂ λ of the first fiber. A third fiber is then selected having a third dispersion and ∂ D ∂ λ such that when a combined transmission line having a desired total length and path-average dispersion is assembled from the first, second, and third fibers, the total ∂ D ∂ λ of the transmission line may be adjusted by adjusting the respective lengths of the first, second, and third fibers, while maintaining the desired total length and path-average dispersion {overscore (D)} of the transmission line. The dispersion maps of the first, second, and third fibers are used to calculate the respective lengths of the three fibers needed to assemble a transmission line having the desired total length, path-average dispersion {overscore (D)}, and ∂ D ∂ λ .
摘要翻译： 描述了用于构建具有期望长度和路径平均色散的光纤传输线的技术，同时也具有期望的总体。在一种方法中，第一光纤被选择为具有第一色散，并且第二光纤被选择具有第二色散并且具有 与第一纤维的分散体和第一纤维相反。 然后选择第三光纤具有第三色散，并且当从第一，第二和第三光纤组装具有所需总长度和路径平均色散的组合传输线时，可以通过调节传输线的总和来调整传输线的总和 在保持期望的总长度和路径平均色散（传输线的D）的情况下，第一，第二和第三光纤的相应长度，使用第一，第二和第三光纤的色散图来计算相应的 需要组装具有所需总长度，路径平均色散的传输线所需的三根纤维的长度（超过（D，
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公开(公告)号：US07369778B2
公开(公告)日：2008-05-06
申请号：US10331299
申请日：2002-12-30
申请人： Xiang Liu , Linn Frederick Mollenauer , Xing Wei
发明人： Xiang Liu , Linn Frederick Mollenauer , Xing Wei
CPC分类号： H04B10/25253 , H04J14/02
摘要： In one embodiment of the invention a dispersion compensator is provided for use in a dense wavelength division multiplexed optical communication system. The dispersion compensator comprises a periodic-group-delay dispersion compensation module which provides a portion of the dispersion compensation for a dispersion managed span of the optical communication system. A remaining portion of the dispersion compensation for the dispersion managed span is provided by dispersion compensating fiber. The portions of the dispersion compensation provided by each of the periodic-group-delay dispersion compensation module and the dispersion compensating fiber is selected such that the collision-induced timing jitter is reduced.
摘要翻译： 在本发明的一个实施例中，提供了一种用于密集波分复用光通信系统中的色散补偿器。 色散补偿器包括周期性组延迟色散补偿模块，其为光通信系统的色散管理跨度提供色散补偿的一部分。 色散管理跨度的色散补偿的剩余部分由色散补偿光纤提供。 由周期群延迟色散补偿模块和色散补偿光纤中的每一个提供的色散补偿的部分被选择为使得碰撞引起的定时抖动减小。
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公开(公告)号：US07062176B2
公开(公告)日：2006-06-13
申请号：US10331217
申请日：2002-12-30
申请人： Xiang Liu , Colin J McKinstrie , Linn Frederick Mollenauer , Richart Elliott Slusher , Xing Wei , Chunhui Xu
发明人： Xiang Liu , Colin J McKinstrie , Linn Frederick Mollenauer , Richart Elliott Slusher , Xing Wei , Chunhui Xu
CPC分类号： H04B10/255
摘要： A nonlinear phase-shift compensation method and apparatus is provided for improving system performance in optical transmission systems. The apparatus includes a phase-shift compensating device that provides a partial compensating phase shift to reduce the nonlinear phase noise resulting from self-phase modulation and amplified spontaneous emissions in an optical transmission system.
摘要翻译： 提供了一种用于提高光传输系统的系统性能的非线性相移补偿方法和装置。 该装置包括相移补偿装置，其提供部分补偿相移以减少由光传输系统中的自相位调制和放大的自发发射引起的非线性相位噪声。
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公开(公告)号：US5956131A
公开(公告)日：1999-09-21
申请号：US682229
申请日：1996-07-17
CPC分类号： G01M11/3163
摘要： A system and method in which the chromatic dispersion characteristic, as a function of distance along a section of transmissive fiber, is measured. First and second optical signals are launched into a fiber under test to thereby generate, by a four-wave mixing process in the fiber, a probe signal. Because of a wave-vector phase mismatch, the probe signal power oscillates with a spatial frequency that can be measured as a function of distance in the fiber. The intensity oscillations are measurable as, for example, temporal variations in the Rayleigh backscattered light detected at the input end of the fiber. According to the present invention, the dispersion parameter at one or both of the first and second optical signal wavelengths, as a function of length along the fiber, is derived directly from these intensity oscillation measurements. From this information, it is possible to further derive maps at other wavelengths of interest.
摘要翻译： 测量作为沿着透射光纤的一段距离的函数的色散特性的系统和方法。 第一和第二光信号被发射到待测光纤中，从而通过光纤中的四波混频处理产生探测信号。 由于波矢量相位不匹配，探针信号功率以可以作为光纤中的距离的函数测量的空间频率振荡。 强度振荡是可测量的，例如，在光纤的输入端处检测到的瑞利背散射光的时间变化。 根据本发明，作为沿着光纤的长度的函数的第一和第二光信号波长的一个或两个处的色散参数直接从这些强度振荡测量得到。 根据该信息，可以进一步推导出感兴趣的其它波长的地图。
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5.发明授权
公开(公告)号：US6011638A
公开(公告)日：2000-01-04
申请号：US599831
申请日：1996-02-12
CPC分类号： G02B6/02247
摘要： A dispersion-tapered fiber for use in a soliton transmission system having lumped amplifiers to substantially reduce loss associated with pseudo phase matching and to relax the limitations on minimum allowable channel spacing caused by cross-phase modulation. The dispersion tapered fiber has a dispersion tapered either continuously or in steps, in conformity with the fiber loss curve.
摘要翻译： 一种用于具有集总放大器的孤子传输系统的色散锥形光纤，以显着减少与伪相位匹配相关的损耗，并且放宽由交叉相位调制引起的对最小允许信道间隔的限制。 色散锥形光纤具有与光纤损耗曲线一致的连续或逐步渐缩的色散。
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6.发明授权Apparatus and methods for nulling non-random timing jitter in the transmission of digital optical signals 失效数字光信号传输中的非随机定时抖动归零的装置和方法
公开(公告)号：US5710649A
公开(公告)日：1998-01-20
申请号：US566815
申请日：1995-12-04
CPC分类号： H04B10/25077 , H04L7/027 , H04J14/02 , H04J14/08 , H04L7/0083 , H04L7/033
摘要： A clock recovery circuit for following rapid changes in the time phase of a data stream is disclosed. The circuit comprises a low Q resonator coupled to a detection device, such as an electro-optic modulator in a time division demultiplexer or a decision circuit of a receiver. Preferably, a high Q resonator or phase locked oscillator is provided, as well. The present invention is particularly useful in a telecommunications system for transmitting solitons. A method of compensating for changes in time phase of a data stream is also disclosed.
摘要翻译： 公开了一种用于跟随数据流的时间相位的快速变化的时钟恢复电路。 电路包括耦合到检测装置的低Q谐振器，例如时分解复用器中的电光调制器或接收机的判定电路。 优选地，还提供高Q谐振器或锁相振荡器。 本发明在用于传送孤子的电信系统中特别有用。 还公开了一种补偿数据流的时间相位变化的方法。
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公开(公告)号：US5646759A
公开(公告)日：1997-07-08
申请号：US555345
申请日：1995-11-08
CPC分类号： H04J14/08 , G02F1/3519
摘要： An improved optical loop mirror is used in an optical demultiplexer to demultiplex time division multiplexed optical communications channels. High bit-rate optical pulses representing a plurality of time division multiplexed communications channels are input to a 3 dB coupler in an optical loop mirror. The coupler separates the high bit-rate optical pulses into two substantially equal high bit-rate pulse streams propagating in opposite directions around a loop of fiber in the mirror. Lower bit-rate optical switching pulses are injected into the loop so as to substantially coincide with selected pulses in the high bit-rate pulse stream corresponding to a communications channel to be demultiplexed from the plurality of multiplexed communications channels. A gain controlling element, such as an amplifier or a lossy element, in the loop changes the amplitude of one of the two high bit-rate pulse streams flowing in the loop so that the selectivity of the demultiplexer to the desired channel and the rejection of unwanted channels by the demultiplexer is enhanced.
摘要翻译： 在光解复用器中使用改进的光环路镜来解复用时分多路复用的光通信信道。 表示多个时分复用通信信道的高比特率光脉冲被输入到光环路镜中的3dB耦合器。 耦合器将高比特率光脉冲分离成两个基本上相等的高比特率脉冲流，在反射镜中的光纤环周围以相反的方向传播。 较低比特率的光切换脉冲被注入到环路中，以便与对应于要从多个复用通信信道解复用的通信信道的高比特率脉冲流中的选定脉冲基本一致。 环路中的诸如放大器或有损元件之类的增益控制元件改变在环路中流动的两个高比特率脉冲流中的一个的振幅，使得解复用器对期望信道的选择性和拒绝 通过解复用器的不需要的信道被增强。
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8.发明授权Time-division multiplexed pump wavelengths resulting in ultra broad band, flat, backward pumped Raman gain 有权时分复用的泵浦波长导致超宽带，平坦，反向泵浦的拉曼增益公开(公告)号：US06611368B1
公开(公告)日：2003-08-26
申请号：US09552772
申请日：2000-04-20
IPC分类号： H01S330
CPC分类号： H04B10/2916
摘要： A method and apparatus for producing a flat gain over very broad gain bands utilizing backward-pumped Raman amplification. The method allows for dynamic gain control through simple electronic means.
摘要翻译： 一种利用反向泵浦拉曼放大在非常宽的增益带上产生平坦增益的方法和装置。 该方法允许通过简单的电子手段进行动态增益控制。
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公开(公告)号：US6011615A
公开(公告)日：2000-01-04
申请号：US871160
申请日：1997-06-09
CPC分类号： G02B6/02247 , H04B10/2525
摘要： Fiber optic cable waste is avoided by measuring amplitude oscillations of four-wave mixing products in positive-dispersion and negative-dispersion fiber optic cable to determine the lengths of a first, positive-dispersion cable segment and a second, negative-dispersion cable segment that are used to provide a specified length of fiber optic cable having a specified amount of path-average chromatic dispersion. The integrated dispersion of a positive-dispersion fiber optic cable as a function of length is measured to provide a first set of data, and the integrated dispersion of a negative-dispersion fiber optic cable as a function of length is measured to provide a second set of data. A fiber-optic cable is simultaneously fed with two optical signals, a first at wavelength .lambda..sub.1 and a second at wavelength .lambda..sub.2, and the number of sinusoidal oscillations that occur in the four-wave mixing products of the Stokes (or anti-Stokes) sideband as a function of cable length are measured. The second set of data is reflected about a line representing zero length, linearly translated by the specified length along a length axis, and then linearly translated by the specified dispersion along an integrated dispersion axis to provide a transformed second set of data. A point of intersection of the first set of data with the transformed second set of data is calculated. A length coordinate of this point of intersection represents the length of the first cable segment. A length for the second cable segment is calculated by subtracting the length of the first cable segment from the specified length.
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公开(公告)号：US4093338A
公开(公告)日：1978-06-06
申请号：US648326
申请日：1976-01-12
CPC分类号： G02B5/32 , Y10S359/90
摘要： Apparatus for piecewise generation of grating-like patterns in photoresponsive material with a coherent the class which splits the coherent beam into two component beams. The two component beams intersect forming a parallel plane interference pattern on a section of the photoresponsive material. An arrangement which translates the beam parallel to itself forms the interference pattern in registration with the previously generated pattern on a different section of the photoresponsive material.
摘要翻译： 用于在光响应材料中分段生成光栅样图案的装置，具有将相干光束分成两个分量光束的相干类。 两个分量光束在光响应材料的一部分上相交形成平行平面干涉图案。 将光束平行于其自身转换的布置形成与光响应材料的不同部分上的先前生成的图案对准的干涉图案。
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