Abstract: An adjustable attenuation adapter mainly comprises a fixing body having a bore centrally disposed therethrough and a connecting member extending outwardly from the bore; a moving body having a cylindrical body with a threaded outer surface; an inner roller being disposed within the central bore of the fixing body, the inner roller having an outer surface with gear teeth and an inner threaded surface for driving the threaded outer surface of the cylindrical body of the moving body; and an adjusting knob disposed within the fixing body and adjacent to the inner roller, the adjusting knob having a gear body for driving gear teeth of the inner roller. Since the threaded outer surface of the cylindrical body is threadedly driven by the inner threaded surface of the inner roller which is also gearedly rotated by the adjusting knob, the rotation of the adjusting knob causes the axial displacement of the moving body with respect to the fixing body.

Abstract: A bimetal-based temperature stabilized multi-FBG package with tunable mechanism mainly includes a moving pin, a bimetal fixture, a rotation sleeve, a locking pin. The moving pin has a first predetermined outer screw pitch at one end and an elongated slot at the other end for receiving the locking pin. The bimetal fixture has a main frame and a plate secured to the main frame. The main frame of the bimetal fixture has a tube member extending outwardly from the side wall thereof, and the tube member has a second predetermined outer screw pitch at the distal end thereof. The rotation sleeve has a first predetermined inner thread corresponding to the first predetermined outer screw pitch of the moving pin and a second predetermined inner thread corresponding to the second predetermined outer screw pitch of the bimetal fixture. The grating fiber is first placed inside the moving pin and then the fiber is metallized or soldered to the moving pin and the holding arm of the bimetal fixture.

Abstract: A temperature-compensating device with tunable mechanism for optical fiber gratings includes a moving pin, a tube housing, a rotation sleeve, a plug and a locking screw. The moving pin has a first predetermined outer screw pitch at one end and an elongated slot at the other end for receiving the locking screw. The tube housing has a second predetermined outer screw pitch at one end and an inner screw pitch at the other end. The rotation sleeve has a first predetermined inner thread corresponding to the first predetermined outer screw pitch of the moving pin, and a second predetermined inner thread corresponding to the second predetermined outer screw pitch of the tube housing. The plug is inserted into the end of the tube housing with outer thread engaged with the inner screw pitch of the tube housing. The grating fiber is placed inside the moving pin. The slot of the moving pin is guided by the locking screw which enables the linear movement of the moving pin.