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1. 发明申请

WO1997024821A1 MONITORING OF AN OPTICAL LINE 审中-公开
标题翻译：监视光线
公开(公告)号：WO1997024821A1
公开(公告)日：1997-07-10
申请号：PCT/GB1996003126
申请日：1996-12-19
申请人： BICC PUBLIC LIMITED COMPANY , HAIGH, Neil, Richard
发明人： BICC PUBLIC LIMITED COMPANY
IPC分类号： H04B10/08
CPC分类号： H04B10/071
摘要： An optical line system comprises: (i) an optical fibre that includes a plurality of reflectors, for example Bragg gratings, located at different positions along the optical fibre; and (ii) a monitoring arrangement located in the region of one end of the optical fibre for monitoring the system by an optical reflectometry method in which light is reflected by the reflectors. The system is characterised in that at least two of the reflectors have reflectivities that differ from one another, the reflector that is more distant from the monitoring arrangement having a higher reflectivity than the Bragg grating that is nearer to the monitoring arrangement. Preferably the reflectivities of the reflectors increases as the distance from the monitoring arrangement increase, the reflectivities preferably having the relationship (I) Rn-1=(2T Rn+1)-(1+4T Rn) /2T Rn where: Rn is the reflectivity of the n th reflector from the monitoring arrangement, Rn-1 is the reflectivity of the (n-1)th reflector from the monitoring arrangement, and T is the transmission coefficient of any branch that may be present between the (n-1)th and the n th reflector (and is unity if no such branch exists). Such a system has the advantage that the signal-to-noise ratio of the most distant reflectors is increased by the greatest extent so that differences in the signal-to-noise ratio of different reflectors is reduced.
摘要翻译：光线路系统包括：（i）光纤，其包括位于沿着光纤的不同位置处的多个反射器，例如布拉格光栅; 以及（ii）位于光纤一端的区域中的监视装置，用于通过反射器反射光的光学反射测量方法来监视系统。该系统的特征在于至少两个反射器具有彼此不同的反射率，离监视装置更远的反射器具有比接近监视装置的布拉格光栅更高的反射率的反射器。优选地，反射器的反射率随着与监视装置的距离增加而增加，反射率优选地具有关系式（I）Rn-1 =（2T2n + 1） - （1 + 4T2n）1 / 2> / 2T <2 Rn其中：Rn是来自监视装置的第n反射器的反射率，Rn-1是来自监视装置的第（n-1）个反射器的反射率，T是透射可以存在于第（n-1）和第n个反射器之间的任何分支的系数（如果不存在这样的分支，则为1）。这样的系统的优点在于，最远的反射器的信噪比最大程度地增加，从而降低了不同反射器的信噪比的差异。

2. 发明申请

WO1996031022A1 OPTICAL FIBRE AND NETWORK 审中-公开
标题翻译：光纤和网络
公开(公告)号：WO1996031022A1
公开(公告)日：1996-10-03
申请号：PCT/GB1996000716
申请日：1996-03-25
申请人： BICC PUBLIC LIMITED COMPANY , HAIGH, Neil, Richard
发明人： BICC PUBLIC LIMITED COMPANY
IPC分类号： H04B10/08
CPC分类号： G01M11/3136 , G01M11/31 , H04B10/071
摘要： An optical network includes a plurality of branches (16, 18, 20, 22) in an optical fibre line between a station-end (1) and a plurality of end users (2, 3, 4, 5), and traffic is modulated at one or more optical wavelengths. The network includes in the region of each end user a combination of reflectors (32, 33, 34, 35) which create a reflection pattern that is unique to that end user. By having a unique reflection pattern it is possible to identify a relatively large number of end users (and other points in the network) using only a relatively small number of different wavelengths. It is possible to employ only a single wavelength using reflectors that are separated from one another so as to generate a unique pattern of reflections in the form of a binary coding.
摘要翻译：光网络包括在站端（1）和多个最终用户（2,3,4,5）之间的光纤线路中的多个分支（16,18,20,22），业务被调制在一个或多个光波长处。网络在每个最终用户的区域中包括反射器（32,33,34,35）的组合，其产生对于该最终用户是唯一的反射图案。通过具有独特的反射模式，可以仅使用相对较少数量的不同波长来识别相对大量的终端用户（和网络中的其他点）。可以仅使用单个波长，使用彼此分离的反射器，以便以二进制编码的形式产生独特的反射模式。

3. 发明申请

WO1996009736A1 OPTICAL NETWORK WITH WAVELENGTH-DEPENDENT ROUTING 审中-公开
标题翻译：具有波长依赖路由的光网络
公开(公告)号：WO1996009736A1
公开(公告)日：1996-03-28
申请号：PCT/GB1995002214
申请日：1995-09-19
申请人： BICC PUBLIC LIMITED COMPANY , MURPHY, Michael, Matthew , HAIGH, Neil, Richard
发明人： BICC PUBLIC LIMITED COMPANY
IPC分类号： H04Q11/00
CPC分类号： H04Q11/0001 , H04Q11/0066
摘要： An optical network in which data signals are encoded with a wavelength corresponding to the address of the signals includes, at at least one point therein, a data routing switch (1) which comprises: (i) a wavelength comparator (3) for example a Bragg grating or a notch filter that will receive data signals and has associated therewith a characteristic wavelength so that it will send the data signal along a gate enabling line (5) or not in accordance with the relationship between the data signal encoding wavelength and the characteristic wavelength of the comparator; and (ii) a gate (7) which transmits or blocks the data signal in response to the presence or absence of the data signal in the gate enabling line. Normally the network will include a number of data routing switches having different characteristic wavelengths so that routing of the data is determined by which switch characteristic wavelength matches the data encoding wavelength. Since the wavelength comparison is a passive process, comparison and switching can be performed more rapidly than with conventional systems.
摘要翻译：数据信号以对应于信号地址的波长进行编码的光网络在其至少一个点处包括数据路由选择开关（1），其包括：（i）波长比较器（3），例如布拉格光栅或陷波滤波器，其将接收数据信号并且与其相关联的特征波长，使得其将沿着栅极使能线（5）发送数据信号，或者根据数据信号编码波长和特性之间的关系发送数据信号比较器的波长; 以及（ii）门（7），其响应于栅极使能线中的数据信号的存在或不存在而发送或阻止数据信号。通常，网络将包括具有不同特征波长的多个数据路由交换机，使得数据的路由由哪个开关特征波长与数据编码波长匹配来确定。由于波长比较是无源过程，因此可以比传统系统更快地执行比较和切换。

4. 发明申请

WO1997015805A1 STRAIN GAUGE 审中-公开
标题翻译：应变计
公开(公告)号：WO1997015805A1
公开(公告)日：1997-05-01
申请号：PCT/GB1996002606
申请日：1996-10-24
申请人： BICC PUBLIC LIMITED COMPANY , HAIGH, Neil, Richard , ROWLAND, Simon, Mark , LINTON, Richard, Stephen
发明人： BICC PUBLIC LIMITED COMPANY
IPC分类号： G01B11/16
CPC分类号： G01L1/246 , G01B11/18 , G01L1/243 , G01L1/245
摘要： An optical fibre strain gauge (1) for an engineering structure e.g. a bridge, building, pipe, plant or the like, comprises: (a) a plurality of supports (8, 10) for the optical fibre that can be located on a surface of the structure and are spaced apart from one another over a part of the surface; and (b) at least one optical fibre (12) that is looped around the supports so that it extends between the supports, the optical fibre being fixed to the supports so that the length of the part of the fibre extending between the supports will vary in accordance with strain of the surface of the structure. The optical fibre(s) (12) can be looped around the supports (8, 10) a number of times, which enables the fibre(s) to be held more easily, and enables the strain gauge to incorporate a length of fibre significantly greater than the dimension of the area of the structure that is being monitored. The fibre(s) will normally contain reflectors such as Bragg gratings to enable signals to be monitored.
摘要翻译：一种用于工程结构的光纤应变计（1），例如桥梁，建筑物，管道，植物等，包括：（a）用于光纤的多个支撑件（8,10），其可以位于所述结构的表面上并且彼此间隔开一部分的表面; 和（b）围绕所述支撑件环绕的至少一个光纤（12），使得其在所述支撑件之间延伸，所述光纤被固定到所述支撑件，使得在所述支撑件之间延伸的所述纤维的所述部分的长度将变化根据结构的表面应变。光纤（12）可以围绕支撑件（8,10）环绕多次，这使得能够更容易地保持纤维，并且使应变计能够显着地结合一定长度的纤维大于被监测结构区域的尺寸。光纤通常将包含诸如布拉格光栅之类的反射器，以使信号得以监控。

5. 发明申请

WO1997005713A1 OPTICAL FIBRE SYSTEM 审中-公开
标题翻译：光纤系统
公开(公告)号：WO1997005713A1
公开(公告)日：1997-02-13
申请号：PCT/GB1996001771
申请日：1996-07-24
申请人： BICC PUBLIC LIMITED COMPANY , HAIGH, Neil, Richard
发明人： BICC PUBLIC LIMITED COMPANY
IPC分类号： H04B10/08
CPC分类号： H04B10/272 , H04B10/071
摘要： An optical fibre system, for example a passive optical network having a tree structure, includes at least one optical fibre and is tested at a number of locations (24, 26 and 32 to 35) by a reflectometry method. The system includes a laser for sending light into the system and a detection station for receiving light that has been reflected at the locations at which the system is tested. The laser emits light at a number of different wavelengths ( lambda 42 to lambda 47) that correspond to different resonant modes of the laser, and each location of the system has at least one Bragg grating (51 to 56) that reflects light at one of the wavelengths of the laser. Different locations in the system have different Bragg gratings and/or combinations of Bragg gratings so that each of the locations will generate a reflection that is characteristic of that location.
摘要翻译：光纤系统，例如具有树结构的无源光网络，包括至少一根光纤，并通过反射测量方法在多个位置（24,26和32至35）进行测试。该系统包括用于将光发射到系统中的激光器和用于接收在系统被测试的位置处被反射的光的检测站。激光器以对应于激光器的不同谐振模式的多个不同波长（λ42至λ47）发射光，并且系统的每个位置具有至少一个布拉格光栅（51至56），其将光反射到激光的波长。系统中的不同位置具有不同的布拉格光栅和/或布拉格光栅的组合，使得每个位置将产生作为该位置的特征的反射。

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