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公开(公告)号：US06751414B1
公开(公告)日：2004-06-15
申请号：US09111490
申请日：1998-07-07
IPC分类号： H04B1024
CPC分类号： H04B10/2972 , H04B10/2563
摘要： To support interleaving of optical channels and to provide sufficient isolation between such interleaved channels, a circulator (60-62) receives, on an optical fiber (16-18), a broadband signal containing a plurality of adjacent channels. The circulator selectively routes the broadband signal through a filter (64, 66) to isolate, on an individual basis, at least one desired channel. A filtered signal, corresponding to the at least one desired channel, is then output from the filter (64-66) and reflected back into the filter by a mirror (68-70) such that the at least one desired channel is subjected to a second filtering process that further improves isolation of the at least one desired channel. Following this second filtering process, the at least one desired channel is applied to the circulator (60-62) for re-inserting into the optical fiber (16-18), as illustrated in FIG. 6. To mitigate the effects of four-wave mixing in each bidirectional optical fiber, a channel assignment plan ensures that pairs of adjacent channels are assigned on a mutually exclusive basis to at least one of an up-link and a down-link direction.
摘要翻译： 为了支持光信道的交织并且在这种交织信道之间提供足够的隔离，循环器（60-62）在光纤（16-18）上接收包含多个相邻信道的宽带信号。 循环器选择性地将宽带信号路由通过滤波器（64,66），以在个别的基础上隔离至少一个期望的信道。 然后从滤光器（64-66）输出对应于至少一个期望通道的滤波信号，并通过反射镜（68-70）反射回滤光器，使得至少一个期望的通道经受 第二滤波处理，其进一步改善所述至少一个期望信道的隔离。 在该第二滤波处理之后，将至少一个期望信道施加到循环器（60-62）以重新插入到光纤（16-18）中，如图6所示。 为了减轻每个双向光纤中四波混频的影响，信道分配方案确保相邻信道的对在互斥的基础上被分配给上行链路和下行链路方向中的至少一个。
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公开(公告)号：US6166850A
公开(公告)日：2000-12-26
申请号：US185932
申请日：1998-11-04
CPC分类号： H01S3/1301 , H01S3/06754
摘要： In an optical transmission system employing optical amplifiers a method of regulating the gain of such an amplifier uses a non-linear control system whose non-linearity of operation is provided at least in part by the enabling/disabling of a portion of the control system by the operation of a transient magnitude threshold sensor.
摘要翻译： 在采用光放大器的光传输系统中，调节这种放大器的增益的方法使用非线性控制系统，其非线性操作至少部分地由控制系统的一部分的使能/禁用提供 瞬态幅度阈值传感器的操作。
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公开(公告)号：US06894829B2
公开(公告)日：2005-05-17
申请号：US10209625
申请日：2002-07-30
IPC分类号： H04J14/00 , H01S3/10 , H04B10/291 , H04B10/294 , H04J14/02 , H01S3/00
CPC分类号： H04B10/2912 , H01S3/10023 , H04B10/291 , H04B10/2941 , H04B2210/003
摘要： A variable gain optical amplifier, in which homogeneous gain broadening is dominant, has first and second fixed gain rare-earth doped optical waveguide amplifiers (21, 23) optically in series together with an intervening variable attenuation optical attenuator (22). This arrangement circumvents the problem of gain tilt encountered when operating such amplifiers under variable gain conditions. An alternative form of the module has variable gain waveguide amplifiers, but these are co-regulated so that the aggregate of their gain at a wavelength within the gain spectrum is maintained constant. A further alternative form of module is employed in a concatenation of such modules. In such a concatenation, the gain of individual modules is allowed to vary, but the aggregate of the gain, at a wavelength within the gain spectrum, of all the waveguide amplifiers of all the modules of the concatenation is maintained constant.
摘要翻译： 其中均匀增益增宽是主要的可变增益光放大器具有与中间可变衰减光衰减器（22）一起光学地串联的第一和第二固定增益稀土掺杂光波导放大器（21,23）。 这种布置避免了在可变增益条件下操作这样的放大器时遇到的增益倾斜的问题。 模块的替代形式具有可变增益波导放大器，但是这些放大器是共同调节的，使得其在增益谱内的波长处的增益的总和保持恒定。 在这种模块的级联中采用另一种替代形式的模块。 在这样的级联中，允许单个模块的增益改变，但是在级联的所有模块的所有波导放大器的增益谱波长内的增益的总和保持恒定。
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公开(公告)号：US5966481A
公开(公告)日：1999-10-12
申请号：US996865
申请日：1997-12-23
申请人： Nigel Edward Jolley , Fiona Davis
发明人： Nigel Edward Jolley , Fiona Davis
CPC分类号： H04B10/2941 , H01S3/063 , H01S3/10023 , H04B10/2912 , H01S2301/06 , H01S3/0675
摘要： An optically amplifying waveguide guides both the LP.sub.01 and the LP.sub.02 mode. Its erbium distribution profile is preferentially matched with the modal field distribution of the LP.sub.02 mode. The waveguide is provided with long period perturbations of a pitch and strength that resonantly couples signal power of different wavelengths from propagation in the LP.sub.01 mode to propagation in the LP.sub.02 mode and back again to propagation in the LP.sub.01 mode whereby the longitudinal distribution of gain along the waveguide at one wavelength is longitudinally displaced with respect to that at least one other wavelength.
摘要翻译： 光放大波导引导LP01和LP02模式。 其铒分布曲线优先与LP02模式的模态场分布匹配。 波导具有间隔和强度的长周期扰动，其将不同波长的信号功率从LP01模式中的传播共振耦合到LP02模式中的传播，并且再次返回到LP01模式中的传播，由此增益沿纵向分布 在一个波长处的波导相对于至少一个其它波长纵向移位。
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公开(公告)号：US06483632B1
公开(公告)日：2002-11-19
申请号：US09214248
申请日：1999-09-20
IPC分类号： H04B1012
CPC分类号： H04B10/2912 , H01S3/10023 , H04B10/291 , H04B10/2941 , H04B2210/003
摘要： A variable gain optical amplifier, in which homogeneous gain broadening is dominant, has first and second fixed gain rare-earth doped optical waveguide amplifiers (21, 23) optically in series together with an intervening variable attenuation optical attenuator (22). This arrangement circumvents the problem of gain tilt encountered when operating such amplifiers under variable gain conditions. An alternative form of the module has variable gain waveguide amplifiers, but these are co-regulated so that the aggregate of their gain at a wavelength within the gain spectrum is maintained constant. A further alternative form of module is employed in a concatenation of such modules. In such a concatenation, the gain of individual modules is allowed to vary, but the aggregate of the gain, at wavelength within the gain spectrum, of all the waveguide amplifiers of all the modules of the concatenation is maintained constant.
摘要翻译： 其中均匀增益增宽是主要的可变增益光放大器具有与中间可变衰减光衰减器（22）一起光学地串联的第一和第二固定增益稀土掺杂光波导放大器（21,23）。 这种布置避免了在可变增益条件下操作这样的放大器时遇到的增益倾斜的问题。 模块的替代形式具有可变增益波导放大器，但是这些放大器是共同调节的，使得其在增益谱内的波长处的增益的总和保持恒定。 在这种模块的级联中采用另一种替代形式的模块。 在这样的级联中，允许单个模块的增益改变，但是在级联的所有模块的所有波导放大器的增益谱波长内的增益的总和保持恒定。
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