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1. 发明授权

EP0626768B1 High capacity optical fiber network and fiber 失效
标题翻译：光纤网络具有高容量和光波导
公开(公告)号：EP0626768B1
公开(公告)日：2006-07-12
申请号：EP94303537.8
申请日：1994-05-18
申请人： AT&T Corp.
发明人： Chraplyvy, Andrew R. , Tkach, Robert William
IPC分类号： H04B10/18
CPC分类号： H04B10/2525 , H04B10/255 , H04B10/2563

2. 发明授权

EP0380243B1 Distributed bragg reflector laser for frequency modulated communication systems 失效转让
标题翻译：激光具有用于频率调制的通信系统中分布反射。
公开(公告)号：EP0380243B1
公开(公告)日：1994-04-06
申请号：EP90300559.3
申请日：1990-01-18
申请人： AT&T Corp.
发明人： Chraplyvy, Andrew R. , Koch, Thomas L. , Tkach, Robert W.
IPC分类号： H01S3/085 , H01S3/103 , H04B10/12
CPC分类号： H01S5/06256 , H01S5/0618 , H01S5/125

3. 发明公开

EP0581525A1 Suppression of brillouin scattering in lightwave transmission system 失效
标题翻译：在einemLichtwellenübertragungssystem的Unterdrückungvon Brillouinstreuung。
公开(公告)号：EP0581525A1
公开(公告)日：1994-02-02
申请号：EP93305772.1
申请日：1993-07-22
申请人： AT&T Corp.
发明人： Chraplyvy, Andrew R. , Mao, Xiaoping , Tkach, Robert William
IPC分类号： G02F1/225 , H04B10/04
CPC分类号： H04B10/2537 , G02F1/225
摘要： Optical nonlinear effects, such as stimulated (Brillouin) scattering, cause disproportionate attenuation of transmitted optical signals and usually occur only when the optical power exceeds a certain level. One of the most important types of nonlinear scattering which occurs in an optical fiber as the power of the optical signal is increased above a certain level is stimulated Brillouin scattering. Brillouin scattering limits the power density of an optical signal that can be injected into an optical fiber. This invention suppresses Brillouin scattering and, by so doing, permits the power density of the optical signal which is injected into an optical fiber to be increased approximately threefold before the Brillouin scattering threshold is reached. More specifically, in a lightwave AM-VSB CATV transmission system having an external modulator (16), the optical beam which is amplitude modulated with the CATV signals (22) is also phase modulated with a sinusoidal signal (25) having a frequency which is not less than twice the frequency of the highest CATV signal. The phase modulation of the optical beam suppresses Brillouin scattering. With this invention the power density of the CATV signal can be increased approximately three fold before the threshold of Brillouin scattering is reached.
摘要翻译：诸如受激（布里渊）散射之类的光学非线性效应导致传输的光信号的不成比例的衰减，并且通常仅在光功率超过一定水平时发生。作为光信号的功率在光纤中发生的最重要的非线性散射类型之一被增加到高于某一水平的是被激发的布里渊散射。布里渊散射限制了可以注入到光纤中的光信号的功率密度。本发明抑制布里渊散射，并且通过这样做，允许注入到光纤中的光信号的功率密度在达到布里渊散射阈值之前增加约三倍。更具体地说，在具有外部调制器（16）的光波AM-VSB CATV传输系统中，用CATV信号（22）进行幅度调制的光束也用正弦信号（25）进行相位调制，该正弦信号（25）的频率为不得低于CATV信号最高频率的两倍。光束的相位调制抑制布里渊散射。利用本发明，在达到布里渊散射的阈值之前，CATV信号的功率密度可以增加大约三倍。

4. 发明公开

EP0380242A2 Distributed feedback laser for frequency modulated communication systems 失效转让
标题翻译：激光切割机RückkoppelungfürFrequenzmodulierte Kommunikationssysteme。
公开(公告)号：EP0380242A2
公开(公告)日：1990-08-01
申请号：EP90300558.5
申请日：1990-01-18
申请人： AT&T Corp.
发明人： Chraplyvy, Andrew R. , Koch, Thomas L. , Tkach, Robert W.
IPC分类号： H01S3/085 , H01S3/103 , H04B10/12
CPC分类号： H01S5/0622 , H01S5/0618 , H01S5/06209 , H01S5/12 , 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 α 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.
摘要翻译：为了克服由于在直接调频应用中的电流注入引起的半导体激光器中的不均匀的频率调制响应的有害影响，已经确定线宽增强因子α尽可能大。在一个实施例中，非常适合于频率调制光波通信系统的分布反馈激光器被设计成具有集成反馈元件，例如波纹光栅，其有效间距被选择以引起布拉格波长，因此激光器工作波长比在没有光栅的半导体结构中的基本上最大增益或增益峰值的波长。也就是说，光栅的波长对增益曲线的峰值的较长波长和较低能量侧被有效地失谐。这种失谐增加了线宽增强因子，使得非均匀的频率调制响应及其影响被最小化，并且在一些情况下基本上被消除。

5. 发明公开

EP0627639A1 Optical fiber for wavelength division multiplexing 失效
标题翻译： Optische FaserfürWellenlängen-Multiplexer。
公开(公告)号：EP0627639A1
公开(公告)日：1994-12-07
申请号：EP94303538.6
申请日：1994-05-18
申请人： AT&T Corp.
发明人： Chraplyvy, Andrew R. , Tkach, Robert William , Walker, Kenneth Lee
IPC分类号： G02B6/22 , G02B6/16 , H04B10/18
CPC分类号： G02B6/02238 , G02B6/4403 , G02B6/4411
摘要： Dispersion shifted optical fiber including a core and a clad suitable for use in wavelength division multiplex systems. The fiber can have an attenuation at 1550nm less than 0.25dB/km, a cut off wavelength of less than 1.40µm, and a dispersion slope less than 0.15ps/(nm²-km). In order to avoid nonlinear effects (as four-wave-mixing) the working wavelength is at a point where the fiber has a residual dispersion of about 3ps/nm-km and not at the zero dispersion point.
摘要翻译：包括适于在波分复用系统中使用的芯和包层的色散位移光纤。纤维可以在1550nm处具有小于0.25dB / km的衰减，小于1.40μm的截止波长和小于0.15ps /（nm 2km）的色散斜率。为了避免非线性效应（作为四波混频），工作波长处于光纤具有约3ps / nm-km的残余色散并且不在零色散点处的点。

6. 发明公开

EP0626768A1 High capacity optical fiber network 失效
标题翻译： Lichtwellenleiternetzwerk mit hoherKapazitätund Lichtwellenleiter
公开(公告)号：EP0626768A1
公开(公告)日：1994-11-30
申请号：EP94303537.8
申请日：1994-05-18
申请人： AT&T Corp.
发明人： Chraplyvy, Andrew R. , Tkach, Robert William
IPC分类号： H04B10/18
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 100km, signal amplification within spans (a span being defined at one end by a transmitter and at the other by a receiver), and provide plural multiplexed channels operative at multiple gigabits per second. The major portion of fiber defining the span has a chromatic dispersion having an absolute value in the range 1.5 to 4 ps/nm-km at the system wavelength.
摘要翻译：具有波分复用功能的高容量光纤网络。考虑的系统可以利用超过100km的跨距，跨度内的信号放大（跨越一端由发射机定义，另一端由接收机定义），并且提供多达多达千兆位/秒的复用信道。限定跨距的光纤的主要部分具有在系统波长处的绝对值在1.5至4ps / nm-km范围内的色散。

7. 发明公开

EP0543570A2 Optical transmission system equalizer 失效
标题翻译： Entzerrer eines optischenNachrichtenübertragungssystems。
公开(公告)号：EP0543570A2
公开(公告)日：1993-05-26
申请号：EP92310342.8
申请日：1992-11-12
申请人： AT&T Corp.
发明人： Chraplyvy, Andrew R. , Nagel, Jonathan A. , Tkach, Robert W.
IPC分类号： H04B10/18 , H04B10/08 , H04J14/02
CPC分类号： H04B10/25073 , H01S3/06754 , H01S2301/04 , H04J14/0221
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.
摘要翻译：增加现有光波传输系统的容量可以通过增加比特率或添加波分复用信道来实现。掺铒光纤放大器技术的最新进展使波分复用选项特别有吸引力。不幸的是，由于掺铒光纤放大器的波长依赖性不均匀增益曲线和饱和特性，波长复用系统的每个通道将会遇到不同的光学增益，这反过来可能导致过大的误码率性能在某些渠道。本发明涉及选择性地均衡波分复用光传输系统的信道的光增益或光信噪比的处理装置。通过调整光输入信号功率来选择性地均衡输出功率和信噪比。利用本发明，可以将波长多路复用通道添加到现有的光纤传输系统中，而不需要在中间放大器位置处的新的光学部件，升级或调整。

8. 发明公开

EP0380242A3 Distributed feedback laser for frequency modulated communication systems 失效转让
标题翻译：用于频率调制通信系统的分布式反馈激光
公开(公告)号：EP0380242A3
公开(公告)日：1991-06-05
申请号：EP90300558.5
申请日：1990-01-18
申请人： AT&T Corp.
发明人： Chraplyvy, Andrew R. , Koch, Thomas L. , Tkach, Robert W.
IPC分类号： H01S3/085 , H01S3/103 , H04B10/12
CPC分类号： H01S5/0622 , H01S5/0618 , H01S5/06209 , H01S5/12 , 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 α 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.

9. 发明授权

EP0668675B1 Multi-channel optical fiber communication system 失效
标题翻译：多信道光纤通信系统
公开(公告)号：EP0668675B1
公开(公告)日：2003-01-15
申请号：EP95300755.6
申请日：1995-02-08
申请人： AT&T Corp.
发明人： Chraplyvy, Andrew R. , Forghieri, Fabrizio , Tkach, Robert W.
IPC分类号： H04J14/02
CPC分类号： H04B10/2563 , H04J14/0224

10. 发明授权

EP0543570B1 Optical transmission system equalizer 失效
标题翻译：的光通信系统的均衡器
公开(公告)号：EP0543570B1
公开(公告)日：2000-03-29
申请号：EP92310342.8
申请日：1992-11-12
申请人： AT&T Corp.
发明人： Chraplyvy, Andrew R. , Nagel, Jonathan A. , Tkach, Robert W.
IPC分类号： H04B10/18 , H04B10/08 , H04J14/02
CPC分类号： H04B10/25073 , H01S3/06754 , H01S2301/04 , H04J14/0221

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