IEC 61300-3的这一部分描述了测量双端口单模无源光学元件衰减和回波损耗的波长依赖性的方法。然而，它不适用于密集波分复用（DWDM）设备。IEC 61300-3-29中描述了DWDM器件衰减波长依赖性的测量方法。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This part of IEC 61300-3 describes methods available to measure the wavelength dependence of attenuation and return loss of two-port, single mode passive optical components. It is not, however, applicable to dense wavelength division multiplexing (DWDM) devices. Measurement methods of wavelength dependence of attenuation of DWDM devices are described in IEC 61300-3-29.All current amendments available at time of purchase are included with the purchase of this document.