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采用光时域反射计(OTDR)监测光损耗的自动化系统已开始出现.在原理上,波分复用技术能以不用的光谱“窗口”探测在使用的光纤.这种方法现已被NTT公司用于其自动光纤运行和支援系统.然而,在某些分配系统中,1310nm的光波第二窗口和1550nm的第三窗口都已被采用,一个窗口用于电话,另一个窗口用于电视.850nm的第一窗口损耗较大,并且在截止波长以下.光时域反射计大的峰值功率使得它在已用的窗口中成为不受欢迎的“入侵者”.
Automated systems for monitoring optical loss using an optical time-domain reflectometer (OTDR) have begun to emerge, and in principle WDM technology can detect the fiber being used in an unused spectral “window.” This method is now used by NTT Corporation However, in some distribution systems, a second window of 1310 nm light and a third window of 1550 nm have been used, one for the telephone and one for the television. The 850 nm The first window has a large loss and is below the cutoff wavelength.The large peak power of the OTDR makes it an unwelcome “intruder” in the used window.