固定损耗是由系统自身所用材料、表面处理决定的，包括菲涅耳损耗、球差损耗、衍射损耗、色散损耗、吸收损耗等。

The invariable loss comes from the materials and surface processing of the system itself, such as the loss of Fresnel, ball aberration, diffraction, chromatic aberration and absorb.

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该市场最大的增长将出现在不间断电源(ups)和更小型的远程固定应用方面，以在电力损耗时的保护数据。

The largest increase in this segment will be for uninterruptible power supply (UPS) and smaller remote stationary applications to protect data during power outages.

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本文讨论了空气隙型光固定衰减器的回波损耗。

This paper discusses the return loss in air-space type fixed optical attenuator.

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