Patent ID: 7063466

Claim:
A ferrule holder for a fiber filter comprising: a unitary body having an axial bore extending along a longitudinal axis, said axial bore having a first end for receiving a first ferrule and a second end for receiving a second ferrule, wherein at least a portion of said unitary body is elastic with respect to expansion, compression or both along the longitudinal axis, wherein said first ferrule has an internal face and an external face each of which are oriented transverse to the longitudinal axis and said second ferule has an internal face and an external face each of which are oriented transverse to the longitudinal axis and wherein said first and second ferrules are positioned such that their internal faces are opposed, wherein said internal faces are separated by an optical resonance cavity distance; a first ferrule fastening element for securing the first ferrule in the unitary body; and a second ferrule fastening element for securing the second ferrule in the unitary body; wherein the longitudinal elasticity of the unitary body allows for variation of the optical resonance cavity distance between the internal faces of the first and second ferrules in a direction substantially parallel to said longitudinal axis while maintaining alignment of the first and second ferrule in all other directions, wherein said longitudinal elasticity of the unitary body is provided by a system of channels created in said unitary body, wherein the channels are oriented perpendicular to the longitudinal axis, and wherein said optical resonance cavity distance is selectably adjustable.