公开(公告)号：US4551019A

公开(公告)日：1985-11-05

申请号：US521003

申请日：1983-08-08

申请人： Paul J. Vella ,  Philip M. Garel-Jones ,  Richard S. Lowe

发明人： Paul J. Vella ,  Philip M. Garel-Jones ,  Richard S. Lowe

IPC分类号： G01M11/00 ,  G01N21/84

CPC分类号： G01M11/335 ,  G01M11/333 ,  G01M11/338

摘要： The chromatic dispersion of an optical fiber such as a 10 to 50 km length of single mode fiber is measured by launching into the fiber the outputs of at least three commonly modulated semiconductor lasers having output wavelengths close to a region of minimum chromatic dispersion of the fiber. At a remote end of the fiber the relative phases of the signals from the three lasers are determined and a chromatic dispersion profile of the fiber is derived from the measured relative phases and the output wavelenghts of the lasers by assuming a parabolic relationship between signal propagation times and wavelength. The profile can be determined by defferentiating a parabolic function fitted to the three date points derived using said three lasers or by directly generating a linear relationship between chromatic dispersion and wavelength on the basis of two values of chromatic dispersion derived from these three data points.

摘要翻译： 通过向光纤发射具有输出波长接近光纤的最小色散区域的至少三个共同调制的半导体激光器的输出来测量诸如10到50km长的单模光纤之类的光纤的色散 。 在光纤的远端，确定来自三个激光器的信号的相对相位，并且通过假设信号传播时间之间的抛物线关系，从所测量的相对相位和激光器的输出波长导出光纤的色散曲线 和波长。 可以通过对安装到使用所述三个激光器导出的三个日期点的抛物线函数进行去除，或者基于从这三个数据点导出的两个色散值直接生成色散和波长之间的线性关系来确定分布。

公开(公告)号：US5546180A

公开(公告)日：1996-08-13

申请号：US498878

申请日：1995-07-06

申请人： Philip M. Garel-Jones ,  Timothy P. Cutts

发明人： Philip M. Garel-Jones ,  Timothy P. Cutts

IPC分类号： G01M11/00 ,  G02B6/35 ,  G01N21/84 ,  G02B6/34 ,  G02B26/08

CPC分类号： G02B6/3524 ,  G01M11/3154 ,  G02B6/3528 ,  G02B6/3556 ,  G02B6/358 ,  G02B6/3582

摘要： A method and apparatus is provided for injecting an optical test pulse mid-stream into an optical path to be tested by providing a switch that in normal transmitting and receiving of data includes two lenses separated by a gap. Data is usually transmitted across the gap from one lens to the other. In a test mode where OTDR is to be performed, a prism functioning in a similar manner to a periscope is moved into the gap between the lenses to couple/inject a test pulse into one of the lenses. An arrangement is described wherein either side of transmission line on either side of the gap can be tested.

摘要翻译： 提供了一种方法和装置，用于通过提供在正常的数据传输和接收中包括由间隙分开的两个透镜的开关将光学测试脉冲中流注入要测试的光路中。 数据通常从一个透镜到另一个透镜的间隙传输。 在要执行OTDR的测试模式中，以与潜望镜类似的方式起作用的棱镜被移动到透镜之间的间隙中以将测试脉冲耦合/注入到其中一个透镜中。 描述了可以测试间隙两侧的传输线的任一侧的布置。

公开(公告)号：US5594820A

公开(公告)日：1997-01-14

申请号：US385477

申请日：1995-02-08

申请人： Philip M. Garel-Jones ,  Murray R. Harman ,  Timothy P. Cutts

发明人： Philip M. Garel-Jones ,  Murray R. Harman ,  Timothy P. Cutts

IPC分类号： G02B6/35 ,  G02B6/38 ,  G02B6/26 ,  G02B6/42

CPC分类号： G02B6/352 ,  G02B6/355 ,  G02B6/358

摘要： An opto-mechanical switch suitable for use in optical telecommunications systems comprises an input port and two output ports interconnected by an optical path, an optical element and an actuation mechanism for moving the optical element relative to the optical path so as to change coupling of light beams between the input port and the output ports. The optical element is supported by a flexible suspension unit comprising a pair of mutually-spaced twin elongate flexures. Each of the pair of flexures is attached at one end to an anchorage and at its other end to a mounting for optical element. The flexures are identical in length and flexibility and are spaced apart in the direction of displacement of the optical element. In use, when the actuator displaces the optical element, the flexures flex in common in the direction of displacement of the optical element. The optical element may be an optical fiber, a mirror, a prism, and so on. The twin flexures obviate the need for precision sliding surfaces which assures greater dependability, especially in switches which are used very infrequently, such as routing switches for re-routing traffic around a failed local station in a ring architecture system.

摘要翻译： 适用于光通信系统的光机械开关包括通过光路互连的输入端口和两个输出端口，光学元件和用于相对于光路移动光学元件的致动机构，以便改变光的耦合 输入端口和输出端口之间的光束。 光学元件由包括一对相互间隔开的双伸长弯曲物的柔性悬挂单元支撑。 一对弯曲部中的每一个在一端附接到锚固件，并且在另一端附接到用于光学元件的安装件。 弯曲部的长度和柔性相同，并且在光学元件的位移方向上间隔开。 在使用中，当致动器移动光学元件时，挠曲件在光学元件的位移方向上共同弯曲。 光学元件可以是光纤，反射镜，棱镜等。 双重弯曲消除了对精确滑动表面的需求，确保更高的可靠性，特别是在非常频繁使用的开关中，例如用于在环形架构系统中绕故障本地站重新路由流量的路由交换机。

公开(公告)号：US4364639A

公开(公告)日：1982-12-21

申请号：US181173

申请日：1980-08-25

申请人： William J. Sinclair ,  Josef Straus ,  Philip M. Garel-Jones

发明人： William J. Sinclair ,  Josef Straus ,  Philip M. Garel-Jones

IPC分类号： G02F1/13 ,  G02F1/1347

CPC分类号： G02F1/1347 ,  G02F1/1313

摘要： A variable attenuation electro-optic device has a lens for collimating light from an input fiber and for focussing light into an output fiber. The optical path of light passing through the device passes through a dynamic scattering liquid crystal cell whose optical transmissivity can be varied by varying an AC electric field applied across it. Reflective and transmissive embodiments are described using one or two lenses of the Selfoc.RTM. type. The applied AC introduces a frequency component into the attenuation which is suppressed to particularly adapt the device for use as an attenuator or enhanced and modulated to particularly adapt the device for use as a modulator.

摘要翻译： 可变衰减电光器件具有用于准直来自输入光纤的光并用于将光聚焦成输出光纤的透镜。 穿过器件的光的光路通过动态散射液晶单元，其光透射率可以通过改变施加在其上的AC电场而改变。 使用Selfoc TM型的一个或两个透镜来描述反射和透射实施例。 所施加的AC将频率分量引入衰减中，该衰减被抑制以特别适合用作衰减器的器件，或者被增强和调制以特别适合用作调制器的器件。