This manually-adjusted, inline, variable optical attenuator (VOA)
is used for precisely balancing the signal strengths in fiber circuits
and also for balancing an optical signal when evaluating the
dynamic range of the measurement system. These in-line VOAs
include SMF-28e fiber with a 3mm jacket, and they are offered
either terminated with FC/APC connectors or non-terminated.
These attenuators are available with other connector styles; please
contact your local Thorlabs office for a quotation.