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公开(公告)号：US5847862A
公开(公告)日：1998-12-08
申请号：US980849
申请日：1997-11-29
CPC分类号： H04B10/2537 , H04J14/0221
摘要： A significant part of signal-to-noise degradation in WDM optical fiber communications, due to Raman crosstalk, is found to be deterministic in nature. Shaping of amplifier output to offset depletion of high frequency channels improves signal capacity by an order of magnitude.
摘要翻译： 发现由于拉曼串扰导致的WDM光纤通信中的信噪比退化的很大一部分在本质上是确定性的。 放大器输出的整形以抵消高频信道的耗尽，将信号容量提高一个数量级。
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公开(公告)号：US06191877B1
公开(公告)日：2001-02-20
申请号：US08683044
申请日：1996-07-15
IPC分类号： H04J1402
CPC分类号： H04B10/2916 , H04J14/0221
摘要： Pump depletion modulation crosstalk between WDM channels in Raman amplified systems is virtually eliminated by exclusive use of backward pumping.
摘要翻译： 拉曼放大系统中WDM通道之间的泵浦耗尽调制串扰实际上通过专用的反向泵浦消除。
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公开(公告)号：US5559920A
公开(公告)日：1996-09-24
申请号：US396841
申请日：1995-03-01
CPC分类号： H04B10/25253
摘要： Critical placement and lengths of dispersion-compensating fiber maximize capacity in upgraded in-ground optical fiber communication systems. Higher per-channel bit rates in single-channel systems and in WDM systems are permitted.
摘要翻译： 色散补偿光纤的临界放置和长度最大限度地提高了升级后的地面光纤通信系统的容量。 允许单通道系统和WDM系统中更高的每通道位速率。
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公开(公告)号：US5546210A
公开(公告)日：1996-08-13
申请号：US501887
申请日：1995-07-13
CPC分类号： H04B10/2563 , H04J14/0224
摘要： Wavelength Division Multiplexed channels in optical fiber communications systems have channel-to-channel frequency spacings which prevent substantial coincidence of 4-wave mixing products with channel carriers. As a consequence, system capacity is increased.
摘要翻译： 波长光纤通信系统中的多路复用通道具有通道间通道的频率间隔，可以防止4波混频产物与通道载波的重合。 结果，系统容量增加。
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5.发明授权System and method for mitigating cross-saturation in optically amplified networks 失效用于减轻光放大网络中交叉饱和度的系统和方法
公开(公告)号：US5907420A
公开(公告)日：1999-05-25
申请号：US713568
申请日：1996-09-13
申请人： Andrew R. Chraplyvy , John C. Ellson , George W. Newsome , Robert William Tkach , John Lehrer Zyskind
发明人： Andrew R. Chraplyvy , John C. Ellson , George W. Newsome , Robert William Tkach , John Lehrer Zyskind
CPC分类号： H04J14/0221
摘要： A system and method of protecting all the amplifiers in a link between wavelength routing network elements of an optical network. According to the invention, an optical control channel is added before a plurality of optical amplifier, preferably the first amplifier, in a link. To prevent improper loading of downstream links, the control channel is stripped off at the next wavelength routing network element. The power of the control channel is automatically adjusted using a fast feedback circuit to hold substantially constant the total power of the signal channels and the control channel at the input of the first amplifier following the feedback loop. In this manner, channel loading of all optical amplifiers in the link is maintained substantially constant, and the incidence of error bursts, as might otherwise result when one or more channels are added or dropped due to a network fault or reconfiguration, is substantially reduced.
摘要翻译： 一种在光网络的波长路由网络元件之间的链路中保护所有放大器的系统和方法。 根据本发明，在多个光放大器之前，在链路中添加光控制信道，优选地是第一放大器。 为了防止下游链路的不正确加载，控制信道在下一个波长路由网元被剥离。 使用快速反馈电路来自动调整控制通道的功率，以在反馈回路之后保持信号通道和控制通道在第一放大器的输入处的总功率的基本恒定。 以这种方式，链路中的所有光放大器的信道负载保持基本恒定，并且当由于网络故障或重新配置而添加或丢弃一个或多个信道时可能导致的错误突发的发生率显着降低。
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公开(公告)号：US5719696A
公开(公告)日：1998-02-17
申请号：US599702
申请日：1996-02-09
CPC分类号： H04B10/2525 , H04B10/255 , H04B10/2563
摘要： A high capacity optical fiber network operative with wavelength division multiplexing. Contemplated systems can utilize span distances in excess of 100 km, signal amplification within spans, and provide plural multiplexed channels operative at multiple gigabits per second.
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公开(公告)号：US06011892A
公开(公告)日：2000-01-04
申请号：US116528
申请日：1998-07-16
CPC分类号： H04B10/2525 , H04B10/255 , H04B10/2563
摘要： A fiber suitable for use in high capacity optical fiber network operative with wavelength division multiplexing. Contemplated systems can utilize span distances in excess of 100 km, signal amplification within spans, and provide plural multiplexed channels operative at multiple gigabits per second.
摘要翻译： 适用于波分复用的大容量光纤网络中的光纤。 考虑的系统可以利用超过100公里的跨距，跨度内的信号放大，并提供多达多达千兆位/秒的多路复用通道。
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公开(公告)号：US5831761A
公开(公告)日：1998-11-03
申请号：US862805
申请日：1997-05-23
CPC分类号： H04B10/2525 , H04B10/255 , H04B10/2563
摘要： A high capacity optical fiber network operative with wavelength division multiplexing. Contemplated systems can utilize span distances in excess of 100 km, signal amplification within spans, and provide plural multiplexed channels operative at multiple gigabits per second.
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公开(公告)号：US5225922A
公开(公告)日：1993-07-06
申请号：US796512
申请日：1991-11-21
IPC分类号： H01S3/10 , H01S3/06 , H01S3/067 , H01S3/13 , H04B10/08 , H04B10/16 , H04B10/17 , H04B10/18 , H04J14/00 , H04J14/02
CPC分类号： H04B10/25073 , H04J14/0221 , H01S2301/04 , H01S3/06754
摘要： Increasing the capacity of an existing lightwave transmission system can be accomplished by either increasing the bit rate or adding wavelength-multiplexed channels. Recent advances in erbium-doped fiber amplifier technology make the wavelength division multiplexed option particularly attractive. Unfortunately, because of nonuniform wavelength-dependent gain profile and saturation characteristic of erbium-doped fiber amplifiers, each channel of a wavelength-multiplexed system will experience a different optical gain which, in turn, can result in an excessive bit-error-rate performance in some channels. This invention is directed toward processing apparatus which selectively equalizes the optical gain or the optical signal-to-noise ratios of the channels of a wavelength-multiplexed optical transmission system. The output powers and the signal-to-noise ratios are selectively equalized by adjusting the optical input signal powers. With this invention, wavelength-multiplexed channels can be added to an existing optical fiber transmission system without requiring new optical components, upgrades or adjustments at intermediate amplifier sites.
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10.发明授权
公开(公告)号：US4908833A
公开(公告)日：1990-03-13
申请号：US303594
申请日：1989-01-27
IPC分类号： H04B10/04 , H01S5/00 , H01S5/06 , H01S5/062 , H01S5/12 , H04B10/06 , H04B10/12 , H04B10/142 , H04B10/152
CPC分类号： H01S5/0622 , H01S5/12 , H01S5/0618 , H01S5/06209 , H01S5/124
摘要： To overcome the deleterious effects of the nonuniform frequency modulation response in semiconductor lasers due to current injection in direct frequency modulation applications, it has been determined that the linewidth enhancement factor .alpha. be made as large as possible. In one embodiment, distributed feedback lasers well suited for frequency modulation lightwave communication systems are designed to have an integrated feedback element such as a corrugation grating whose effective pitch is selected to cause the Bragg wavelength and, therefore, the laser operating wavelength to be longer than the wavelength at substantially the maximum gain or gain peak in the semiconductor structure without the grating. That is, the wavelength of the grating is effectively detuned toward the longer wavelength and lower energy side of the peak of the gain profile. Such detuning increases the linewidth enhancement factor in such a way that the nonuniform frequency modulation response and its effects are minimized and, in some cases, substantially eliminated.
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