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31. 发明公开

EP1869947A1 METHOD AND APPARATUS FOR COMMUNICATING SOUND OVER AN OPTICAL LINK 有权
标题翻译：方法和装置TONKOMMUNIKATION关于的光路上
公开(公告)号：EP1869947A1
公开(公告)日：2007-12-26
申请号：EP06726725.2
申请日：2006-04-12
申请人： BRITISH TELECOMMUNICATIONS public limited company
发明人： HEALEY, Peter , SIKORA, Edmund, Sergio, Robert
IPC分类号： H04R23/00 , H04R1/44 , H04B10/12
CPC分类号： H04R23/008 , H04B10/548
摘要： The present invention relates to the communication or reproduction of sound, in particular audible sound. There is provided a method of communicating a sound, including the steps of: transmitting, onto an optical link, pairs of signal copies, the signal copies of a given pair having a time offset relative to one another; applying the audible sound to the optical link, such that the audible sound causes a phase modulation to the transmitted signal copies; receiving modulated signal copies previously transmitted onto the link; and, for received pairs of signal copies, causing one signal copy of a pair to mix with the other signal copy of that pair so as to produce a signal representative of the sound. The sound is an audible sound. It has been found that a delay of at least 75 micro seconds allows for a better reproduction of audio sounds, since these have a relatively low frequency content.

32. 发明公开

EP1825613A1 ASSESSING A NETWORK 有权
标题翻译：网络评估
公开(公告)号：EP1825613A1
公开(公告)日：2007-08-29
申请号：EP05826466.4
申请日：2005-12-15
申请人： BRITISH TELECOMMUNICATIONS public limited company
发明人： SIKORA, Edmund Sergio Robert , HEALEY, Peter
IPC分类号： H04B10/08
CPC分类号： H04B10/071
摘要： The present invention relates to a method of assessing a network, in particular a network having a main line and a plurality of branch lines. The method includes the steps of: (i) introducing test signals into the main line, the main line being coupled to the branch lines; (ii) imposing a modulation on test signals which propagate along the branch line and, (iii) monitoring test signals returned along the main line. The imposed phase modualtion is detected interferometrically such that the test sgnals from the designated branch line can be distinguished with respect to the signals returned from other branch lines.

33. 发明公开

EP1825227A1 OPTICAL SYSTEM 有权
标题翻译：光学系统
公开(公告)号：EP1825227A1
公开(公告)日：2007-08-29
申请号：EP05818393.0
申请日：2005-12-16
申请人： BRITISH TELECOMMUNICATIONS public limited company
发明人： HEALEY, Peter , SIKORA, Edmund Sergio Robert
IPC分类号： G01D5/353
CPC分类号： G01D5/35303
摘要： The present invention relates to an disturbance sensing system, in particular an optical system in which a disturbance can be inferred. The system includes: a first waveguide portion and a second waveguide portion disposed in a side to side arrangement relative to one another; launch means for launching a first signal and a second signal onto the first waveguide portion and the second waveguide portion respectively, the first and second waveguide portions being optically coupled such that each of the transmitted first and second signals travels along each of the first and second waveguides; and, combining means for combining the transmitted first and second signals so as to produce a combination signal, the first and second signals being related to one another such that a disturbance in either one of the first and the second waveguide portions can be inferred from the combination signal. The noise or other signal resulting from a disturbance applied to both waveguide portions will be at least partially suppressed.

34. 发明公开

EP1747445A2 EVALUATING THE POSITION OF A TIME-VARYING DISTURBANCE 有权转让
标题翻译： AUSWERTUNG DER POSITION EINER ZEITLICHVERÄNDERLICHENSTÖRUNG
公开(公告)号：EP1747445A2
公开(公告)日：2007-01-31
申请号：EP05733029.2
申请日：2005-03-31
申请人： BRITISH TELECOMMUNICATIONS public limited company
发明人： HEALEY, Peter , SIKORA, Edmund, Sergio, Robert
IPC分类号： G01M11/00
CPC分类号： G01D5/35303 , G01M11/3172
摘要： The position of a disturbance on an optical link is evaluated, in particular where the disturbance is a time-varying disturbance. An optical time domain reflectometry technique is used in which a series of low coherence test pulses is launched by means of an optical pulse source into an the optical link, and the backscattered return signal is monitored. The test pulses pass through an unbalanced Mach Zhender interferometer with the result that for each test pulse, a pair of time-displaced pulse copies is launched onto the link. The backscattered return signal is passed through the same interferometer, which causes the pulse copies of each pair to become realigned and to interfere with one another. A time-varying disturbance is likely to affect each pulse copy of a pair differently. As a result, an abnormality such as a step is likely to occur in the backscattered signal. From the time position of an abnormality, the distance of the disturbance responsible is evaluated.
摘要翻译：评估光链路上的干扰位置，特别是在干扰是时变干扰的情况下。使用光时域反射测量技术，其中通过光脉冲源将一系列低相干测试脉冲发射到光链路中，并且监视反向散射返回信号。测试脉冲通过不平衡的Mach Zhender干涉仪，结果是对于每个测试脉冲，一对时间位移脉冲副本被发送到链路上。反向散射返回信号通过相同的干涉仪，这导致每对的脉冲副本变得重新对准并且彼此干扰。时变干扰可能会影响一对的每个脉冲副本。结果，在后向散射信号中可能发生诸如台阶的异常。从异常的时间位置，评估干扰的距离。

35. 发明授权

EP0485490B1 A MONITOR UNIT FOR MONITORING AN OPTICAL WAVEGUIDE 失效
标题翻译：光纤控制器
公开(公告)号：EP0485490B1
公开(公告)日：1996-02-21
申请号：EP90912517.1
申请日：1990-07-30
申请人： BRITISH TELECOMMUNICATIONS public limited company
发明人： HEALEY, Peter , SMITH, David, William Braeside Mill Lane
IPC分类号： H04B10/08
CPC分类号： H04B10/0775 , H04B10/0795 , H04B10/07953
摘要： A monitor unit (1) for detecting physical interference of a communications fibre (4) in a transmission system (2) comprises a monitor circuit (9) coupled to the communications fibre (4). A portion of a signal being transmitted along the communications fibre (4) is coupled out of the fibre (4) and into the monitor unit (1). A filter (8) allows only one of two orthogonal polarisation field components to pass through it to the monitor circuit (9). By detecting fluctuations in the polarisation state of the filtered optical signal, the monitor circuit (9) allows the detection of external influences to be determined.

36. 发明公开

EP0485490A1 A MONITOR UNIT FOR MONITORING AN OPTICAL WAVEGUIDE 失效
标题翻译：光纤控制器。
公开(公告)号：EP0485490A1
公开(公告)日：1992-05-20
申请号：EP90912517.0
申请日：1990-07-30
申请人： BRITISH TELECOMMUNICATIONS public limited company
发明人： HEALEY, Peter , SMITH, David, William Braeside Mill Lane
IPC分类号： H04B10
CPC分类号： H04B10/0775 , H04B10/0795 , H04B10/07953
摘要： A monitor unit (1) for detecting physical interference of a communications fibre (4) in a transmission system (2) comprises a monitor circuit (9) coupled to the communications fibre (4). A portion of a signal being transmitted along the communications fibre (4) is coupled out of the fibre (4) and into the monitor unit (1). A filter (8) allows only one of two orthogonal polarisation field components to pass through it to the monitor circuit (9). By detecting fluctuations in the polarisation state of the filtered optical signal, the monitor circuit (9) allows the detection of external influences to be determined.

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