A novel fiberhyphen;compatible acoustohyphen;optic modulator is described in which the interaction between the optical and acoustic waves occurs in a gradedhyphen;index lens which can also function as an lsquo;lsquo;expandedhyphen;beamrsquo;rsquo; fiberhyphen;tohyphen;fiber connector in the case of a halfhyphen;pitch device, or as a collimator in the case of a quarterhyphen;pitch device. Initial results using a quarterhyphen;pitch lens are diffraction efficiences of 3percnt;, and diffraction loss of 7percnt;, using 0.5 W power of 80 MHz rf under cw operation and under pulsed operation, using pulse widths down to 40 ns. A 14 ns switching time was measured.
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