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Opt Lett. 1995 Mar 15;20(6):644-6.

Variable optical delay line based on a birefringent planar optical platform.


A variable optical delay line is proposed for accurately adjusting optical signal timing in photonic systems. This delay line is based on a birefringent planar optical platform characterized by the multiple reflection of light beams. It consists of a birefringent plate, lambda/4 plates, mirrors, and a liquid-crystal layer. It can select an arbitrary delay from a set of discrete delays precisely determined by the thickness of the birefringent plate. A feasibility study confirms seven-step delay line operation with a 240-ps unit delay.


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