359 / | HD | OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS |
237 | DF | OPTICAL MODULATOR {3} |
298 | DF | .~ Light wave directional modulation (e.g., deflection or scanning is representative of the modulating signal) {5} |
305 | DF | .~.~ Acousto-optic {9} |
307 | .~.~.~ Utilizing optical feedback |