1 . The
power loss that occurs when an optical
signal is transferred from one fiber to another that is axially aligned with it, but longitudinally separated from it. Note: The gap allows
light from the "transmitting" fiber to spread out as it leaves the fiber endface. When it strikes the "receiving" fiber, some of the light will enter the
cladding , where it is quickly lost. [After
FAA ] 2 . An analogous form of
coupling loss that occurs between an
optical source , e.g. , an LED, and an
optical fiber . Note: Gap loss is not usually significant at the
optical detector , because the sensitive area of the detector is normally somewhat larger than the cross section of the fiber
core . Unless the separation is substantial, all light emerging from the fiber, even though it diverges, will still strike the
detector . Synonym longitudinal offset
loss . [
FAA ]
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