Abstract
The authors describe a ferroelectric actuator that uses an LiNbO/sub 3/ plate with an antipolarity ferroelectric laminar domain (inversion layer). They studied the characteristics of 140 degrees and 165 degrees rotated Y-cut LiNbO/sub 3/ bimorph plates and explored the feasibility of using an actuator with the LiNbO/sub 3/ plate in an optical switch that switches the optical paths of multimode optical fibers. The actuator fabricated had stoppers on both sides of the plate and a 45-mg load was bonded using soft resin. This mass was used to damp secondary resonance generated by the plate hitting the stopper. The actuator could be switched in 10 ms or less. The authors made a prototype optical switch by placing graded-index fibers on the top of the LiNbO/sub 3/ plate to permit optical path switching based on the actuator's displacement. The optical switch had a switching time of 10 ms or less, with a loss of 0.8 dB or less. >
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