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公开(公告)号：US4070091A
公开(公告)日：1978-01-24
申请号：US677750
申请日：1976-04-16
CPC分类号： H04B10/85 , G02B6/4469
摘要： An optical fibre has a light conducting core surrounded by first and second cladding layers of sequentially lower refractive index. A data-carrying signal can be propagated in the core and a monitoring signal--of a higher modal order than the data signal--can be propagated in the core and first cladding layer. Any attempt to rap the fibre and abstract data information results in aberration of the monitor signal, which can be detected. The monitor signal can be such that resolvable signals cannot be obtained from the data channel by a tap.
摘要翻译： 光纤具有由依次较低折射率的第一和第二覆层围绕的导光芯。 数据承载信号可以在芯中传播，并且可以在芯和第一覆层中传播比数据信号更高模态次序的监测信号。 任何试图拉伸光纤和抽象数据信息都会导致监视信号的像差，这可以被检测。 监视信号可以使得通过水龙头不能从数据通道获得可解析信号。
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公开(公告)号：US3988614A
公开(公告)日：1976-10-26
申请号：US591498
申请日：1975-06-30
CPC分类号： H04B10/25133 , G02B6/29361 , G02B6/29373 , G02B6/29394 , G02B6/4215 , Y10S359/90
摘要： The chromatic pulse dispersion of a light beam in an optical fibre can be equalized by dispersing the light beam into a spectrum, detecting different portions of the spectrum and producing signals related to each portion, applying different time delays to the signals and then combining the signals to provide an output. The spectrum can be divided into discrete portions having a range of wavelengths, with optical delay lines, optical filters, and multiple section photodetectors used. The spectrum can be formed on one surface of a PIN diode, having the I layer of a thickness which varies along the length, giving in effect division of the spectrum into an infinite number of portions.
摘要翻译： 可以通过将光束分散到光谱中来平衡光纤中的光束的色散脉冲色散，检测光谱的不同部分并产生与每个部分有关的信号，对信号施加不同的时间延迟，然后组合信号 提供输出。 频谱可以分为具有波长范围的离散部分，具有光学延迟线，光学滤波器和使用的多个部分光电探测器。 光谱可以形成在PIN二极管的一个表面上，其具有沿着长度变化的厚度的I层，实际上将光谱划分成无限数量的部分。
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