Angular misalignment loss
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In waveguide design and construction, angular misalignment loss is Power loss caused by the deviation from optimum angular alignment of the axes of source-to-waveguide, waveguide-to-waveguide, or waveguide-to-detector. Note 1: The waveguide may be dielectric (an optical fiber) or metallic.
Note 2: Angular misalignment loss does not include lateral offset loss and longitudinal offset loss.
Source: from Federal Standard 1037C