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1.发明授权公开(公告)号：US06650673B2
公开(公告)日：2003-11-18
申请号：US09213088
申请日：1998-12-15
申请人： Jin Hong , Rongqing Hui , Maurice S. O'Sullivan
发明人： Jin Hong , Rongqing Hui , Maurice S. O'Sullivan
IPC分类号： H01S319
CPC分类号： H01S5/1228 , H01S5/0057 , H01S5/0265 , H01S5/0623 , H01S5/06258 , H01S5/1021 , H01S5/1215
摘要： A compact source capable of generating continuously tunable high frequency microwave radiation and short optical pulses in the picosecond/sub-picosecond range is invented. It includes a laser structure having two lasers formed on the same substrate which simultaneously operate at different longitudinal modes. Each laser has a complex coupled (gain-coupled or loss-coupled) grating which is formed by deep etching through a multi-quantum well structure, either of the active medium or of the additional lossy quantum-well layers, thus ensuring no substantial interaction between lasers. The lasers have a common active medium and shared optical path and provide mutual light injection into each other which results in generation of a beat signal at a difference frequency of two lasers. The beat frequency is defined by spacing between the laser modes and may be continuously tuned by current injection and/or temperature variation. Thus, the beat signal provides a continuously tunable microwave radiation. To form a train of short optical pulses, the beat signal is either further sent to a saturable absorber followed by a semiconductor optical amplifier, or sent directly into an optical compressor which includes a dispersion fiber. As a result, a duration of each impulse is compressed, and a train of short optical pulses is formed.
摘要翻译： 发明了能够产生连续可调谐的高频微波辐射和皮秒/次皮秒范围内的短光脉冲的紧凑型光源。 它包括具有形成在同一衬底上的两个激光器的激光器结构，其同时在不同的纵向模式下工作。 每个激光器具有复合耦合（增益耦合或损耗耦合）光栅，其通过深入蚀刻通过多量子阱结构，活性介质或附加的有损的量子阱层中的任一个形成，从而确保没有实质的相互作用 激光之间。 激光器具有共同的有源介质和共享光路，并且彼此相互注入，这导致以两个激光器的差频产生拍频信号。 节拍频率由激光模式之间的间距定义，并且可以通过电流注入和/或温度变化来连续调谐。 因此，拍频信号提供连续可调的微波辐射。 为了形成短脉冲序列，将拍频信号进一步发送到可饱和吸收体，随后是半导体光放大器，或者直接发送到包括分散光纤的光学压缩器中。 结果，每个脉冲的持续时间被压缩，并形成一串短的光脉冲。
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公开(公告)号：US06473214B1
公开(公告)日：2002-10-29
申请号：US09283213
申请日：1999-04-01
IPC分类号： H04B1004
CPC分类号： H04L5/06 , H04L25/497 , H04L27/02
摘要： A binary signal is encoded to produce a three-level encoded signal having reduced bandwidth and small low frequency and d.c. components, e.g. using modified duobinary encoding, the encoded signal directly modulating a semiconductor laser to produce a frequency modulated optical signal, which is passed through an interference filter to provide two-state amplitude modulation from the three-state frequency modulation for direct recovery of the binary signal by an optical receiver, the interference filter providing constructive and destructive interference for frequencies corresponding to binary one and zero bits respectively. An array transmission system can be provided by combining multiple such frequency modulated optical signals, from multiple lasers with respective central frequencies and respective encoders for multiple binary signals, using an array waveguide which also serves as a channel frequency filter, with a single interference filter. Polarization modulation instead of frequency modulation, and external modulation of an optical signal from an optical source, are also described.
摘要翻译： 二进制信号被编码以产生具有减小的带宽和小的低频和直流的三电平编码信号。 组分，例如 使用修改的二进制编码，编码信号直接调制半导体激光器以产生调频光信号，该信号通过干涉滤波器从三态调制提供双态幅度调制，以通过以下方式直接恢复二进制信号： 光接收机，干扰滤波器分别为对应于二进制1和零位的频率提供建设性和相消干扰。 可以通过使用具有单个干涉滤波器的阵列波导来组合来自具有各自中心频率的多个激光器和多个二进制信号的相应编码器的多个这种频率调制光信号来提供阵列传输系统。 还描述了偏振调制而不是频率调制，以及来自光源的光信号的外部调制。
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公开(公告)号：US06101012A
公开(公告)日：2000-08-08
申请号：US343414
申请日：1999-06-30
申请人： David John Danagher , Alan G. Solheim , Maurice S. O'Sullivan , Richard A. Habel , Kim Byron Roberts , Duncan John Forbes , Nigel Baker , Ian Hardcastle , Takis Hadjifotiou , Bipin Patel , Giuseppe Bordogna , James St. Leger Harley
发明人： David John Danagher , Alan G. Solheim , Maurice S. O'Sullivan , Richard A. Habel , Kim Byron Roberts , Duncan John Forbes , Nigel Baker , Ian Hardcastle , Takis Hadjifotiou , Bipin Patel , Giuseppe Bordogna , James St. Leger Harley
CPC分类号： H04J14/0221 , H04J14/0212 , H04Q11/0005 , H04Q2011/0016 , H04Q2011/0024 , H04Q2011/0039 , H04Q2011/0069
摘要： An add/drop multiplexer/demultiplexer (ADM) for switching, modulating and attenuating optical signals in a fiber optic network employing wavelength division multiplexing (WDM) is disclosed. The ADM is equipped an optical multiplexer for splitting an input WDM signal into individual optical signals, leading to respective 2.times.2 switches. Each switch has another input originating from a plurality of "add lines", and selects one of its inputs to be dropped and the other to continue along a main signal path. The retained signals may be modulated and attenuated prior to being tapped and finally multiplexed together by a WDM multiplexer. The tapped signals are optoelectronically converted and fed back to a controller, preferably a digital signal processor running a software algorithm, which controls the switching, modulation and attenuation. This permits remote control of the ADM functions by encoding instructions for the controller into a low-frequency dither signal that is embedded within the individual optical signals. The ADM can accordingly be instructed to reroute traffic, dynamically equalize or otherwise change optical channel power levels, and add or remove dither, all in real time. A specific optical channel may be reserved for control purposes, allowing a network administrator to "log in" to the ADM to override the controller software algorithm. Optionally, the optical signals can be tapped upon entry to the ADM. A bidirectional ADM can be constructed from two unidirectional ADMs, and may share the same controller. Also, a single, general multi-input multi-output switch can be used to provide an arbitrary mapping between individual input and output optical signals.
摘要翻译： 公开了一种用于在采用波分复用（WDM）的光纤网络中切换，调制和衰减光信号的分插复用器/解复用器（ADM）。 ADM装备有一个光信号多路复用器，用于将输入的WDM信号分离成各自的光信号，从而产生各自的2x2开关。 每个开关具有源自多个“相加线”的另一个输入，并且选择其一个输入被丢弃，另一个输入沿主信号路径继续。 保留的信号可以在被抽头之前被调制和衰减，并且最终由WDM多路复用器多路复用在一起。 抽头信号被光电转换并反馈到控制器，优选地是运行软件算法的数字信号处理器，其控制开关，调制和衰减。 这允许通过将控制器的指令编码成嵌入各个光信号内的低频抖动信号来远程控制ADM功能。 因此可以指示ADM重新路由业务，动态均衡或以其他方式改变光信道功率级别，并且实时地添加或去除抖动。 可以保留特定的光通道用于控制目的，允许网络管理员“登录”到ADM以覆盖控制器软件算法。 可选地，可以在进入ADM时轻拍光信号。 双向ADM可以由两个单向ADM构建，并且可以共享相同的控制器。 此外，单个一般的多输入多输出开关可用于提供各个输入和输出光信号之间的任意映射。
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公开(公告)号：US4983024A
公开(公告)日：1991-01-08
申请号：US417490
申请日：1989-10-05
IPC分类号： G02F2/00
CPC分类号： G02F2/002
摘要： A method of optical phase to amplitude demodulation comprises intersecting two mutually coherent beams of light inside a Kerr medium. One of the beams is unmodulated and the other is phase modulated. The Kerr medium is non-linear and is characterized by an equation n=n.sub.0 +n.sub.2 I, where n is the local refractive index of the medium at a point of interest, n.sub.0 is the linear refractive index of the medium, n.sub.2 is a nonlinear refractive index of the medium and I is the light intensity at the point of interests. An amplitude modulated output beam is generated.
摘要翻译： 光相位到幅度解调的方法包括在克尔介质内相交两个相互相干的光束。 一个光束是未调制的，另一个是相位调制的。 克尔介质是非线性的，其特征在于等式n = n0 + n2I，其中n是介质在目标点处的局部折射率，n0是介质的线性折射率，n2是非线性折射率 我的指数是我的兴趣点的光强度。 产生幅度调制输出光束。
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公开(公告)号：US07352971B2
公开(公告)日：2008-04-01
申请号：US10209904
申请日：2002-08-02
IPC分类号： H04B10/12
CPC分类号： H04B10/2569
摘要： A method and system is provided for compensating polarization mode dispersion (PMD) in an optical communications system includes a controller designed to control a broadband PMD compensator to differentially delay light at each one of a plurality of selected wavelengths. At least one of the selected wavelengths lies between an adjacent pair of channel wavelengths of the optical communications system. A performance parameter value indicative of PMD is measured at each channel wavelength of the optical communications system. An estimated performance parameter value is then calculated at each selected wavelength, and an error function calculated as a function of wavelength based on the estimated performance parameter values. The broadband PMD compensator is then controlled to minimize the value of the error function.
摘要翻译： 提供了一种用于补偿光通信系统中的偏振模色散（PMD）的方法和系统，包括设计成控制宽带PMD补偿器差分延迟多个选定波长中的每一个处的光的控制器。 所选择的波长中的至少一个位于光通信系统的相邻的一对通道波长之间。 在光通信系统的每个信道波长处测量指示PMD的性能参数值。 然后在每个选择的波长处计算估计的性能参数值，并且基于估计的性能参数值计算作为波长的函数的误差函数。 然后控制宽带PMD补偿器以最小化误差函数的值。
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6.发明授权公开(公告)号：US06687464B1
公开(公告)日：2004-02-03
申请号：US09481691
申请日：2000-01-12
IPC分类号： H04B1008
CPC分类号： H04B10/2503 , H04B10/079
摘要： An optical communications system is adapted for connection to an optical fiber link of an optical communications network. The system obtains a fiber identifier respecting the optical fiber link; a respective optimum setting of one or more parameters of the optical communications system; and adjusts a respective value of each parameter in accordance with the respective optimum setting. The fiber identifier can be obtained from a value of at least one fiber transmission property of the optical fiber link. The fiber transmission property value is used to search a look-up table of class definitions, each class definition including a respective class identifier and at least one corresponding characteristic transmission property value. A class identifier is selected as the fiber identifier from the class definition for which each characteristic transmission property value most closely matches a corresponding fiber transmission property value. Each class definition may also include an optimum setting for each parameter.
摘要翻译： 光通信系统适于连接到光通信网络的光纤链路。 该系统获得关于光纤链路的光纤标识符; 光通信系统的一个或多个参数的相应最佳设置; 并根据各自的最佳设定调整各参数的相应值。 可以从光纤链路的至少一个光纤传输特性的值获得光纤标识符。 光纤传输属性值用于搜索类定义的查找表，每个类定义包括相应的类标识符和至少一个对应的特征传输属性值。 从类别定义中选择类别标识符作为每个特征传输特性值与其对应的光纤传输属性值最匹配的类定义。 每个类定义也可以包括每个参数的最佳设置。
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公开(公告)号：US06438148B1
公开(公告)日：2002-08-20
申请号：US09405119
申请日：1999-09-27
IPC分类号： H01S310
CPC分类号： H01S5/1228 , H01S5/0057 , H01S5/0265 , H01S5/0623 , H01S5/06258 , H01S5/1021 , H01S5/1215
摘要： A device for encoding data into high speed optical train includes N data encoding branches, each having a dual-mode laser, generating at the beat frequency f, and an external modulator. Each dual mode laser includes a laser structure having two sections formed on the same substrate which simultaneously operate at different longitudinal modes. Each section has a complex coupled (gain-coupled or loss-coupled) grating which is formed by deep etching through the multi-quantum well structure, ensuring no substantial interaction between lasers. The sections have common active medium and shared optical path and provide mutual light injection into each other. Signals from the branches are put through a variable delay line, introducing phase shifts between the signals, and compressed in the optical compressor. Thus, N short pulse optical trains are formed. The phase shifts between the signals are adjusted so that, when the trains are further combined in the optical combiner, they interleave in a precise timing to form one combined optical pulse train of frequency Nf. Thus, encoding of data at a speed, which is much higher than the speed of the external modulator, is achieved. The corresponding method of encoding data is also provided.
摘要翻译： 用于将数据编码成高速光学列车的装置包括N个数据编码分支，每个分支具有以拍频f产生的双模激光器和外部调制器。 每个双模激光器包括具有形成在同一基板上的两个部分的激光结构，其同时在不同的纵向模式下操作。 每个部分具有通过深度蚀刻穿过多量子阱结构形成的复合耦合（增益耦合或损耗耦合）光栅，确保激光器之间没有实质的相互作用。 这些部分具有共同的有源介质和共享光路，并且彼此相互注入。 来自分支的信号通过可变延迟线，引入信号之间的相移并在光学压缩器中压缩。 因此，形成N个短脉冲光学列车。 调整信号之间的相移，使得当光组合器中的列进一步组合时，它们在精确的定时交织以形成频率为Nf的一个组合光脉冲串。 因此，以比外部调制器的速度高得多的速度对数据进行编码。 还提供了相应的编码数据的方法。
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公开(公告)号：US06069906A
公开(公告)日：2000-05-30
申请号：US213088
申请日：1998-12-15
申请人： Jin Hong , Rongqing Hui , Maurice S. O'Sullivan
发明人： Jin Hong , Rongqing Hui , Maurice S. O'Sullivan
摘要： A compact source capable of generating continuously tunable high frequency microwave radiation and short optical pulses in the picosecond/sub-picosecond range is invented. It includes a laser structure having two lasers formed on the same substrate which simultaneously operate at different longitudinal modes. Each laser has a complex coupled (gain-coupled or loss-coupled) grating which is formed by deep etching through a multi-quantum well structure, either of the active medium or of the additional lossy quantum-well layers, thus ensuring no substantial interaction between lasers. The lasers have a common active medium and shared optical path and provide mutual light injection into each other which results in generation of a beat signal at a difference frequency of two lasers. The beat frequency is defined by spacing between the laser modes and may be continuously tuned by current injection and/or temperature variation. Thus, the beat signal provides a continuously tunable microwave radiation. To form a train of short optical pulses, the beat signal is either further sent to a saturable absorber followed by a semiconductor optical amplifier, or sent directly into an optical compressor which includes a dispersion fiber. As a result, a duration of each impulse is compressed, and a train of short optical pulses is formed.
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公开(公告)号：US5959749A
公开(公告)日：1999-09-28
申请号：US81666
申请日：1997-05-20
申请人： David John Danagher , Alan G. Solheim , Maurice S. O'Sullivan , Richard A. Habel , Kim Byron Roberts , Duncan John Forbes , Nigel Baker , Ian Hardcastle , Takis Hadjifotiou , Bipin Patel , Giuseppe Bordogna , James St. Leger Harley
发明人： David John Danagher , Alan G. Solheim , Maurice S. O'Sullivan , Richard A. Habel , Kim Byron Roberts , Duncan John Forbes , Nigel Baker , Ian Hardcastle , Takis Hadjifotiou , Bipin Patel , Giuseppe Bordogna , James St. Leger Harley
CPC分类号： H04J14/0221 , H04J14/0212 , H04Q11/0005 , H04Q2011/0016 , H04Q2011/0024 , H04Q2011/0039 , H04Q2011/0069
摘要： An add/drop multiplexer/demultiplexer (ADM) for switching, modulating and attenuating optical signals in a fiber optic network employing wavelength division multiplexing (WDM) is disclosed. The ADM is equipped an optical multiplexer for splitting an input WDM signal into individual optical signals, leading to respective 2.times.2 switches. Each switch has another input originating from a plurality of "add lines", and selects one of its inputs to be dropped and the other to continue along a main signal path. The retained signals may be modulated and attenuated prior to being tapped and finally multiplexed together by a WDM multiplexer. The tapped signals are optoelectronically converted and fed back to a controller, preferably a digital signal processor running a software algorithm, which controls the switching, modulation and attenuation. This permits remote control of the ADM functions by encoding instructions for the controller into a low-frequency dither signal that is embedded within the individual optical signals. The ADM can accordingly be instructed to reroute traffic, dynamically equalize or otherwise change optical channel power levels, and add or remove dither, all in real time. A specific optical channel may be reserved for control purposes, allowing a network administrator to "log in" to the ADM to override the controller software algorithm. Optionally, the optical signals can be tapped upon entry to the ADM. A bidirectional ADM can be constructed from two unidirectional ADMs, and may share the same controller. Also, a single, general multi-input multi-output switch can be used to provide an arbitrary mapping between individual input and output optical signals.
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公开(公告)号：US4859018A
公开(公告)日：1989-08-22
申请号：US61625
申请日：1987-06-15
CPC分类号： H04B10/2507 , G02B6/2861
摘要： A bandwidth limiter for an optical fiber transmission path comprises a four-port optical coupler via which an optical signal is passed. A spliced optical fiber provides a loop, from an output to an input of the coupler, with a predetermined propagation delay and attenuation. An alternative arrangement uses two couplers which are coupled together via fibers of different length and hence propagation delay.
摘要翻译： 用于光纤传输路径的带宽限制器包括通过光信号的四端口光耦合器。 拼接的光纤以预定的传播延迟和衰减提供从耦合器的输出到输入的环路。 一种替代方案是使用两个耦合器，它们通过不同长度的光纤和传播延迟耦合在一起。
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