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引言本文报导光时域反射计方面的重要进展,它是运用光子计数技术完成的。用模拟技术来放大和从时间上来分辨瑞利散射所产生信号的光时域反射计,已用于光纤系统成为较成熟的一种诊断工具。到现在为止,仪器的有效范围通常限于光纤单程衰减约为25dB,实际上大多数商用光时域反射计没有达到这个数字,相差有10dB之多。例如来自空气中良好光纤端面的强反射可以被探测的范围约为30dB,但端面质量的任何降低都将减小仪器的有效性。
Introduction This article reports on the important advances in optical time domain reflectometry. It is done using photon counting techniques. Optical time-domain reflectometry, which uses analogue techniques to amplify and time-resolved the signals produced by Rayleigh scattering, has been used in fiber optic systems to become a more sophisticated diagnostic tool. Up to now, the effective range of the instrument is usually limited to about 25dB of single-pass fiber attenuation. In fact, most commercially available optical time-domain reflectometers do not reach this figure, a difference of 10dB. For example, a strong reflection from a good fiber end face in the air can be detected in the range of about 30 dB, but any reduction in the quality of the end face will reduce the effectiveness of the instrument.