Single wafered ferrule fiber fabry-perot filters

A fiber Fabry-Perot filter (FFP) having:

• a. a fiber ferrule assembly through which an optical fiber extends and which has an optical resonance cavity along a length of said optical fiber, said assembly comprising a first and a second ferrule each of which has a substantially axial bore therethrough in which a portion of said optical fiber is positioned, and a first and a second mirror positioned to interrupt said optical fiber and thereby form said resonance cavity, said mirrors located in parallel planes with respect to one another, said planes substantially normal to the axis of said length of optical fiber, said first ferrule is a wafered ferrule comprised of a wafer with a first end and a second end, said first end bonded to said first ferrule to form a wafer portion of said wafered ferrule, said first mirror embedded between said first ferrule and said first end of said wafer, said wafer portion thereby residing within said resonance cavity, said second ferrule is a mirrored-end ferrule having no wafer bonded thereto but having said second mirror deposited on an end thereof, said cavity containing a gap located directly between said second mirror and said second end of said wafer, and
• b. means for holding said ferrules in an aligned relative axial relation to one another such that an optical signal can be transmitted through the optical fiber of said assembly.