We propose and demonstrate an all-optical deflection switch with photorefractive duplex two-wave mixing (TWM) in which common grating is shared by the TWM of the two control beams and that of signal beams in a photorefractive crystal. TWM occurs both with the signal beams and with the control beams. By calculating the output intensities of the signal beams, we show that the output intensities of the signal beams are controllable by use of the phase difference of the control beams. We analyze the practical ratio of the intensities of the control beams to those of the signal beams for effective switching. A comparison of the numerical analysis with a basic experiment is given. Qualitative agreement is exhibited.
© 2001 Optical Society of America
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