Patent ID: 6684022
Filing Date: 2004-01-27
Classification: G02B,Y02B

Abstract:
A manual variable optical attenuator comprising:a base; a cover having a sidewall and defining a hole in the sidewall; a shifting device comprising a screw pole with screw threads thereon, gasket sealing a gap between the screw pole and the sidewall, and a holder which is located in a slot in said side wall for preventing axial movement of the screw pole relative to the cover; an optical module comprising a mirror, a frame, a dual optical fiber collimator, a stopper, and a graded transmittance filter mounted on a filter carrier, wherein said frame accommodates said mirror and movably accommodates the filter, the screw pole is inserted through the hole and the stopper and threadingly engage with the filter carrier, and said stopper is used to prevent the filter carrier from moving too far to either side of the screw pole; and an optical fiber retainer.