Patent ID: 6738557
Filing Date: 2004-05-18
Classification: G02B

Abstract:
An optical attenuator comprising:an input optical fiber, for inputting light signals to be attenuated; an output optical fiber, for outputting attenuated light signals; a first ferrule receiving the input optical fiber therein; a second ferrule receiving the output optical fiber therein; a neutral density filter comprising a first surface and a second surface, wherein at least one of the first surface and the second surface is not parallel to end surfaces of said input optical fiber and said output optical fiber; a plurality of retaining devices retaining the filter, the first ferrule and the second ferrule; and a cover retaining the retaining devices and protecting the optical attenuator; wherein the neutral density filter is attached to a terminal of the first ferrule, and is spaced from a terminal of the second ferrule which confronts the terminal of the first ferrule, and the neutral density filter has a refractive index matching refractive indices of the input optical fiber and the output optical fiber.