The AFS variable attenuators ATT-110, ATT-120, and ATT-130 are ideal for simulating cable loss for
lab testing of link power margin or reducing power in links where
receivers are being overloaded. These variable attenuators works on
a gap-loss principle. Pulling the connector end-faces apart induces
the loss. Since the light exits in an expanding cone, the receiving
fiber will capture less light, as the gap gets larger.
Application:
Air gap attenuators are ideal for use with any LED systems and
many laser systems. Some laser systems, especially high-speed
digital links (over 1 GB/s) or analog CATV systems may not operate
well with these attenuators due to back reflections. If you are
using these attenuators in those types of systems, you should use
the ATT-120 with a FC/APC connector, which have very low return loss
even when unmated.
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