Patent ID: 8229269

Claim:
An apparatus for attenuating light passed through a launch multimode fiber and detected by a power meter, comprising: at least one ferrule offset assembly having opposing first and second ferrules with respective first and second ends and first and second fiber channels maintained in general relative and adjustable alignment, and an offset adjusting device adapted to adjust the relative alignment of the first and second fiber channels to create at least one select fiber channel alignment offset, the first and second ferrules have respective first and second central ferrule axes maintained in alignment, the first and second fiber channels have respective first and second central fiber channel axes, the first and second fiber channel axes are radially offset from the respective first and second ferrule axes so that the at least one select fiber channel alignment offset is provided by rotating the first ferrule about its central ferrule axis and the offset adjusting device includes a lever mechanically coupled to one of the first and second ferrules and configured so that moving the lever causes a rotation of the corresponding first or second ferrule; first and second multimode fibers having respective first and second ends disposed in the first and second fiber channels to have a fiber alignment corresponding to the fiber channel alignment; and wherein the first multimode fiber has an end configured to optically couple to the launch multimode fiber so as to receive the light therefrom, and wherein at least some of the light passes through the second multimode fiber to the power meter.