| 摘要 |
<p>A controllably variable optical fiber attenuator comprises a housing (100) and a pair of optical connector assemblies (300, 400) in which at least one of the optical connector assemblies includes an optical fiber termination element, such as a ferrule (350, 450), that is movable toward and away from the optical termination element of the other connector assembly to vary the length of the optical path between fiber termination elements. The movable element is carried by a carriage that is guided by the inner surfaces of the housing (100) and a guide pin slidably received in a bore of the carriage. A motor (210) drives a threaded shaft that engages mating threads in a bore of the carriage to effect linear movement of the carriage. An anti-lash spring is used with the carriage and motor shaft to enhance accuracy of movement. The motor (210) is preferably servo-controlled.</p> |
