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公开(公告)号：US5463487A
公开(公告)日：1995-10-31
申请号：US283263
申请日：1994-07-29
申请人： Richard E. Epworth
发明人： Richard E. Epworth
IPC分类号： H04B10/291 , H04B10/296 , H04J14/02
CPC分类号： H04B10/296 , H04B10/2912 , H04J14/0221
摘要： In a wavelength division optical transmission system incorporating optical amplifiers, an identifying pilot tone is modulated on to each multiplexed wavelength. Each system amplifier determines from the pilot tones the total number of wavelengths being transmitted and thereby provides a corresponding adjustment of the amplifier gain. This prevents overamplification when one or more wavelengths is missing from the multiplexed signal e.g. as the result of a transmitter fault.
摘要翻译： 在包含光放大器的波分光传输系统中，识别导频音被调制到每个复用波长上。 每个系统放大器从导频音调确定正在传输的波长的总数，从而提供放大器增益的相应调整。 这防止了从多路复用信号中丢失一个或多个波长时的过度放大。 作为发射机故障的结果。
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公开(公告)号：US4749246A
公开(公告)日：1988-06-07
申请号：US59239
申请日：1987-06-10
CPC分类号： G01D5/35383
摘要： A distributed optical fiber sensor cable, for sensing perturbations such as pressure, comprises a length of optical fiber (10) and means adapted, in response to the perturbation to be sensed, to mechanically deform separate portions of the length of the fiber at sensing elements (11,12,13) periodically along their length in order to cause optical power launched into a mode of propagation in the core (14) and guided thereby to be coupled to an unguided mode, for example a cladding (15) mode. The coupling is optical wavelength selective and the separate sensing elements are each addressed with a different wavelength (.lambda..sub.11, .lambda..sub.12, .lambda..sub.13) for spatial resolution along the length of the cable.
摘要翻译： 用于感测诸如压力的扰动的分布式光纤传感器电缆包括一定长度的光纤（10）和适于响应待感测的扰动的机械地使感测元件的纤维长度分开的部分变形的装置 （11,12,13）周期性地沿其长度周期性地引起光功率发射到芯（14）中的传播模式并被引导，从而被耦合到非导向模式，例如包层（15）模式。 耦合是光学波长选择性的，并且分离的感测元件各自用不同的波长（λ11，λ12，λ13）寻址，用于沿电缆长度的空间分辨率。
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公开(公告)号：US4718121A
公开(公告)日：1988-01-05
申请号：US836795
申请日：1986-03-06
申请人： Richard E. Epworth
发明人： Richard E. Epworth
IPC分类号： H04B10/00 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/148 , H04B10/152 , H04B9/00
摘要： In a coherent optical receiver using balanced photodetectors, local oscillator intensity fluctuations are nulled out by cross-correlating them with an imperfectly balance output to derive an error signal used in a feedback loop to optimize the balance.
摘要翻译： 在使用平衡光电探测器的相干光接收机中，本地振荡器强度波动通过将它们与不完全平衡输出相互相关来导出，从而导出在反馈回路中使用的误差信号以优化平衡。
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公开(公告)号：US5602949A
公开(公告)日：1997-02-11
申请号：US599120
申请日：1996-02-09
申请人： Richard E. Epworth
发明人： Richard E. Epworth
CPC分类号： G02B6/022 , G02B6/29317 , G02B6/29322 , G02B6/29394 , G02B6/3838
摘要： A distributed Bragg grating of uniform pitch is created in a length of unstrained optical fibre which is then secured in an arcuate path to a flexible plate so as to be displaced from the neutral surface of bending of that plate. Changing the curvature of the plate imparts axial strain in the fibre which is arranged to be non-uniform as the result of the path of the fibre being arcuate. This non-uniform strain has the effect of converting the uniform grating into a chirped grating, such as may for instance be used as a dispersion equaliser.
摘要翻译： 在一束长度不变的光纤中产生均匀间距的分布式布拉格光栅，然后将其固定在弓形路径中，以柔性板从该板的弯曲的中性表面移位。 改变板的曲率使得纤维中的轴向应变由于纤维的路径弓形而被布置为不均匀。 这种非均匀应变具有将均匀光栅转换成啁啾光栅的效果，例如可以用作色散均衡器。
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公开(公告)号：US5452117A
公开(公告)日：1995-09-19
申请号：US242731
申请日：1994-05-13
申请人： Richard E. Epworth
发明人： Richard E. Epworth
IPC分类号： H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152 , H04B10/158 , H04L27/14
摘要： A method of controlling a laser in an FSK direct detection system employing a two-path unbalanced interferometer in series with the laser output, the method including the steps of sensing when the system output level reaches a predetermined threshold, and superimposing a fixed amplitude step of drive current on the feedback controlled modulated drive current to the laser. The superimposed fixed amplitude step in the laser drive current causes a phase shift in the interferometer sufficient to cause the interferometer to acquire a fresh interference fringe whenever the interferometer is near to running out of range. The superimposed fixed amplitude step may be synchronized with a data bit transition.
摘要翻译： 一种在采用与激光输出串联的双路不平衡干涉仪的FSK直接检测系统中控制激光的方法，所述方法包括以下步骤：当系统输出电平达到预定阈值时，以及叠加固定幅度步长 驱动电流对激光的反馈控制调制驱动电流。 激光驱动电流中叠加的固定幅度步长导致干涉仪中的相移足以使干涉仪每当干涉仪接近运行超出范围时获得新的干涉条纹。 叠加的固定幅度步长可以与数据位转换同步。
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公开(公告)号：US5287366A
公开(公告)日：1994-02-15
申请号：US890566
申请日：1992-05-28
IPC分类号： H04B10/04 , H01S5/00 , H01S5/06 , H01S5/068 , H01S5/0683 , H01S5/0687 , H04B10/06 , H04B10/142 , H04B10/152 , H04B10/155 , H01S3/10
CPC分类号： H04B10/504 , H01S5/0014 , H01S5/06835 , H01S5/0687
摘要： An injection laser driver regulates the bias and modulation depth by means of two feedback control loops, one deriving its feedback control signal from a measure of the mean optical output of the laser, and the other deriving its feedback control signal from a measure of the spectral purity of that optical output. The spectral purity measure is conveniently effected by measuring the coherence function at a specific value of differential delay using a Mach-Zehnder interferometer configuration with a passive quadrature optical network.
摘要翻译： 注入激光驱动器通过两个反馈控制环来调节偏置和调制深度，一个从激光的平均光学输出的测量中得出其反馈控制信号，另一个从光谱的测量中导出其反馈控制信号 该光输出的纯度。 频谱纯度测量通过使用具有无源正交光网络的马赫 - 曾德干涉仪配置测量差分延迟的特定值处的相干函数来方便地实现。
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公开(公告)号：US4533247A
公开(公告)日：1985-08-06
申请号：US410741
申请日：1982-08-23
申请人： Richard E. Epworth
发明人： Richard E. Epworth
IPC分类号： H04B10/00 , G02F1/21 , G08C23/04 , H04B10/142 , H04B10/158 , H04B14/00 , G01B9/02
CPC分类号： H04B10/676 , G02F1/21 , H04B14/002
摘要： An optical transmission system comprises a light source, which may be coherent or incoherent, a first optical interferometer wherein light from the source is modulated, an optical path, which may be either free space or an optical fiber, along which the modulated output of the first interferometer is propagated, a second interferometer wherein light received from the optical path is demodulated, and a photodetector to which the demodulated output is applied. Typically the first interferometers is a Fabry-Perot etalon, the length of the resonant cavity of which can be altered to modulate light applied thereto.
摘要翻译： 光传输系统包括可以是相干或不相干的光源，其中来自源的光被调制的第一光学干涉仪，可以是自由空间或光纤的光路，沿着该光路的调制输出 第一干涉仪被传播，其中从光路接收的光被解调的第二干涉仪，以及被应用了解调输出的光电检测器。 通常，第一干涉仪是法布里 - 珀罗标准具，其谐振腔的长度可以改变以调制施加到其上的光。
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公开(公告)号：US5452116A
公开(公告)日：1995-09-19
申请号：US216254
申请日：1994-03-22
申请人： Paul A. Kirkby , Richard E. Epworth
发明人： Paul A. Kirkby , Richard E. Epworth
CPC分类号： H04J14/0221 , H04B10/2912 , H04B10/2935 , H04J14/0201
摘要： In a wavelength multiplexed optical transmission system incorporating a concatenation of optical amplifiers the multiplexed signal passes through a limited number of amplifiers in which all channels are amplified together, after which, at the next amplifier, the signal is demultiplexed, each channel is separately amplified, and then the channels are remultiplexed.
摘要翻译： 在包含光放大器级联的波分复用光传输系统中，多路复用信号通过有限数量的放大器，其中所有通道被放大在一起，之后，在下一个放大器处，信号被解复用，每个通道被单独放大， 然后通道被重新多路复用。
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公开(公告)号：US4898443A
公开(公告)日：1990-02-06
申请号：US289396
申请日：1988-12-19
IPC分类号： G02B6/293 , H04B10/148
CPC分类号： H04B10/60
摘要： A non-circularly-symmetric intensity distribution is formed on a quadrant photodetector by coherently mixing two optical signals propagating in selected modes of different order. These modes are chosen either such that a change in relative phase of the two signals produces solely a rotation of the orientation of that intensity distribution, or such that a change in relative states of polarization produces this rotation.
摘要翻译： 通过相干地混合以不同顺序的选定模式传播的两个光信号，在象限光电检测器上形成非圆形对称强度分布。 这些模式被选择为使得两个信号的相对相位的变化仅产生该强度分布的取向的旋转，或者使得相对极化状态的变化产生该旋转。
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公开(公告)号：US4625305A
公开(公告)日：1986-11-25
申请号：US411755
申请日：1982-08-26
申请人： Richard E. Epworth
发明人： Richard E. Epworth
IPC分类号： H04J1/00 , G02B6/34 , H04B10/2581 , H04J14/00 , H04J14/02 , H04J14/04 , H04J14/06 , H04B9/00
CPC分类号： G02B6/29358 , G02B6/2938 , H04B10/2581 , H04J14/02
摘要： In an optical transmission system in which a plurality of optical signal channels is multiplexed before transmission along a common optical path to a receiver, each channel is produced by means of a respective multimode injection laser, the overall cavity length of each laser being arranged to provide a multimode spectral output with a respective intermode spacing which differs from that provided by the other lasers for channel discrimination purposes. Comb filters are employed for demutliplexing.
摘要翻译： 在其中多个光信号通道在沿着公共光路传送到接收器之前多路复用的光传输系统中，通过相应的多模式注入激光器产生每个通道，每个激光器的整个腔体长度被设置成提供 具有各自的间隔间隔的多模光谱输出，其不同于由其他激光器提供用于信道识别目的的。 梳状滤波器用于去复用。
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