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公开(公告)号：US07366425B2
公开(公告)日：2008-04-29
申请号：US10386359
申请日：2003-03-11
IPC分类号： H04B10/04
CPC分类号： H04B10/50575 , H04B10/505 , H04B10/5162 , H04B10/5165 , H04B10/5167
摘要： Different techniques for generating spectrally efficient carrier-suppressed modulated optical signals, also known as “phase-shaped binary transmission” (PSBT) signals, employ electrical components that generate only 2-level or binary signals, in contrast to techniques that require 3-level electrical drivers. The PSBT modulators can be used with return-to-zero (RZ) modulators for generating RZ-PSBT signals, which have the characteristic of even greater spectral efficiency than NRZ PSBT signals. The technique is generalized to RZ signals with an arbitrary phase difference between pulses. These signals can be generated by shifting the central (carrier) frequency of an RZ modulated optical signal, which can be done using a certain phase modulation or using spectral filtering with a passband offset from the center (carrier) frequency of the modulated optical signal, and the signals can also be generated by phase modulation at a frequency lower than the signaling rate of the modulated signal.
摘要翻译： 用于产生频谱效率高的载波抑制调制光信号的不同技术也称为“相位二进制传输”（PSBT）信号，采用仅产生2电平或二进制信号的电气部件，与需要3级 电动司机。 PSBT调制器可以与返回零（RZ）调制器一起使用，用于产生RZ-PSBT信号，其具有比NRZ PSBT信号更高的频谱效率的特性。 该技术被推广到具有脉冲之间的任意相位差的RZ信号。 这些信号可以通过移位RZ调制光信号的中心（载波）频率来产生，这可以使用一定的相位调制或使用具有从调制的光信号的中心（载波）频率的通带偏移的频谱滤波， 并且信号也可以通过低于调制信号的信号速率的频率的相位调制来产生。
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2.发明授权Control of an optical modulator for desired biasing of data and pulse modulators 有权用于数据和脉冲调制器的所需偏置的光调制器的控制公开(公告)号：US07394992B2
公开(公告)日：2008-07-01
申请号：US10386358
申请日：2003-03-11
申请人： Myles Kimmitt , John E. Kaufmann , Yuval Shohet , Kent Springer , Tina Fjelde , Pavel V. Mamyshev , Benny P. Mikkelsen
发明人： Myles Kimmitt , John E. Kaufmann , Yuval Shohet , Kent Springer , Tina Fjelde , Pavel V. Mamyshev , Benny P. Mikkelsen
CPC分类号： G02F1/0123 , H04B10/505 , H04B10/5051 , H04B10/50575 , H04B10/50577 , H04B10/516
摘要： In an optical transmitter, continuous wave light from a laser passes through a data modulator (DM) for non-return-to-zero (NRZ) encoding of a data stream and through a pulse modulator to add return-to-zero encoding to the modulated optical signal. A modulator controller monitors the output optical signal power, optimizes the bias setting for the DM and the PM, and optimizes the phase relationship between the pulse and data components of the modulated optical signal. For each optimization, a low amplitude and low frequency dither signal is injected at appropriate points in the modulator. A single photo detector and electrical receiver are used in a multiplexed fashion to monitor the optical output signal and derive separate feedback signals. Remaining control circuitry forces a null in a respective residual dither component in the optical output signal to maintain the desired bias level or phase alignment.
摘要翻译： 在光发射机中，来自激光器的连续波光通过用于数据流的非归零（NRZ）编码的数据调制器（DM），并通过脉冲调制器将归零编码添加到 调制光信号。 调制器控制器监视输出光信号功率，优化DM和PM的偏置设置，并优化调制光信号的脉冲和数据分量之间的相位关系。 对于每个优化，在调制器中的适当点处注入低振幅和低频抖动信号。 以多路复用方式使用单个光电检测器和电接收器来监测光输出信号并导出单独的反馈信号。 剩余控制电路迫使光输出信号中的相应残余抖动分量中的零，以保持期望的偏置电平或相位对准。
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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：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Soliton transmission system having sliding-frequency guiding filters with particular filter strengths and sliding rates 失效Soliton传输系统具有特定滤波器强度和滑动速率的滑动频率导引滤波器
公开(公告)号：US5463489A
公开(公告)日：1995-10-31
申请号：US297336
申请日：1994-08-29
CPC分类号： H04B10/25077
摘要： A soliton transmission system comprising optical filters whose center frequency intentionally differs from the center frequency of adjacent optical filters is disclosed, wherein the filter strength .eta. of the filters is between about 0.3-0.5, and preferably is 0.4. The center frequency of the series of optical filters is translated along the desired length of the system in a predetermined manner at a rate of less than or equal to (2/27).sup.1/2 .eta. and greater than or equal to 0.034.eta.+0.047.eta..sup.2. The center frequencies of the optical filters preferably increase in the direction of propagation.
摘要翻译： 公开了一种包括其中心频率与相邻滤光器的中心频率有意地不同的滤光器的孤子传输系统，其中滤光器的滤光强度等于或大于0.3-0.5，优选为0.4。 一系列滤光器的中心频率以小于或等于（2/27）1/2等于或大于或等于0.034等于+0.047的速率以预定方式沿着系统的期望长度平移 光学滤波器的中心频率优选地在传播方向上增加。
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公开(公告)号：US06141090A
公开(公告)日：2000-10-31
申请号：US365572
申请日：1999-08-02
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.
摘要翻译： 通过测量正色散和负色散光纤电缆中四波混频产品的幅度振荡来确定第一个正色散电缆段和第二个负色散电缆段的长度，以避免光纤电缆浪费。 用于提供具有指定量的路径平均色散的指定长度的光纤电缆。 测量作为长度的函数的正色散光缆的集成色散以提供第一组数据，并测量作为长度的函数的负色散光缆的集成色散以提供第二组 数据的。 光纤电缆同时馈送两个光信号，第一个波长为λ1，另一个为波长λ2，以及在斯托克斯（或反斯托克斯）的四波混频产物中发生的正弦振荡次数 ）边带作为电缆长度的函数。 第二组数据被反映在表示零长度的线上，沿着长轴线性地转换指定长度，然后沿着整合的色散轴线被线性地转换指定的色散，以提供经变换的第二组数据。 计算第一组数据与变换的第二组数据的交点。 该交点交点的长度坐标表示第一电缆段的长度。 通过从指定长度减去第一电缆段的长度来计算第二电缆段的长度。
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7.发明授权Phase modulator-based generation of high-quality high bit rate return-to-zero optical data streams 失效基于相位调制器的高质量高比特率归零光学数据流的生成
公开(公告)号：US6072615A
公开(公告)日：2000-06-06
申请号：US874891
申请日：1997-06-13
申请人： Pavel V. Mamyshev
发明人： Pavel V. Mamyshev
IPC分类号： H04B10/155 , H04B10/04
CPC分类号： H04B10/505 , H04B10/508
摘要： Apparatus and method for generating a return-to-zero (RZ) optical data stream. A laser or other continuous wave (CW) optical source generates an optical carrier signal which is applied to a phase modulator. A return-to-zero data generator multiplies a non-return-to-zero (NRZ) electrical data stream and a sinusoidal electrical signal to generate an RZ electrical data stream. The phase modulator modulates the RZ electrical data stream onto the optical carrier signal to generate a phase-modulated optical signal. A Stokes portion or an anti-Stokes portion of the phase-modulated optical signal spectrum is then spectrally separated in an optical filter to provide a corresponding output RZ optical data stream. The spectral separation may be provided using a discrete filter coupled to the output of the phase modulator, or using transmission line filtering in a soliton transmission system. The use of the phase modulator to perform data encoding operations avoids the modulation bias drift problems inherent in amplitude modulators.
摘要翻译： 用于产生归零（RZ）光数据流的装置和方法。 激光或其他连续波（CW）光源产生施加到相位调制器的光载波信号。 归零数据发生器将不归零（NRZ）电数据流和正弦电信号相乘以产生RZ电数据流。 相位调制器将RZ电数据流调制到光载波信号上以产生相位调制光信号。 然后相位调制的光信号频谱的斯托克斯部分或反斯托克斯部分在滤光器中被光谱分离，以提供对应的输出RZ光数据流。 可以使用耦合到相位调制器的输出的分立滤波器，或者在孤子传输系统中使用传输线滤波来提供频谱分离。 使用相位调制器执行数据编码操作避免了幅度调制器固有的调制偏移漂移问题。
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公开(公告)号：US5473458A
公开(公告)日：1995-12-05
申请号：US364644
申请日：1994-12-27
IPC分类号： H04B10/04 , H04B10/00 , H04B10/06 , H04B10/142 , H04B10/152 , H04B10/18
CPC分类号： H04B10/25077
摘要： Method and apparatus of soliton transmission using a non-soliton source are described. The soliton transmission is generally in the form of an optical pulse sequence, Intensity and phase modulation of a continuous wave optical signal generates a pair of optical pulse sequences related to Stokes and anti-Stokes components of the doubly modulated optical signal. By proper alignment of the optical frequency of the cw optical signal with the passband of a filtered transmission line, it is possible to have the filtered transmission line comprising sliding frequency-guiding filters permit only one of the pulse sequences to be selected and thereby form a soliton pulse sequence.
摘要翻译： 描述了使用非孤子源的孤子传输的方法和装置。 孤子传输通常以光脉冲序列的形式，连续波光信号的强度和相位调制产生与双重调制光信号的斯托克斯和反斯托克斯分量有关的一对光脉冲序列。 通过将cw光信号的光频率与滤波的传输线的通带正确对准，可以使包括滑动导频滤波器的滤波的传输线仅允许选择一个脉冲序列，从而形成 孤子脉冲序列。
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9.发明授权Dual-wavelength source of high-repetition rate, transform-limited optical pulses 失效双重波长源的高重复率，变换限制光脉冲
公开(公告)号：US5432631A
公开(公告)日：1995-07-11
申请号：US223915
申请日：1994-04-06
申请人： Pavel V. Mamyshev
发明人： Pavel V. Mamyshev
CPC分类号： H04B10/50 , G02F2203/26
摘要： A method and apparatus for producing high quality optical pulse trains at a high repetition rate first phase modulates a cw optical signal with an external phase modulator. The central optical frequencies (i.e., the carrier frequency and at least one pair of sidebands) of the phase modulated signal are then removed from the signal. Each of the remaining side-bands that have not been removed independently form an optical pulse train of the desired transform-limited pulses.
摘要翻译： 用于以高重复率产生高质量光脉冲串的方法和装置首先用外部相位调制器调制cw光信号。 然后从信号中去除相位调制信号的中心光学频率（即，载波频率和至少一对边带）。 每个尚未被去除的剩余边带形成期望的变换限制脉冲的光脉冲串。
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