We have demonstrated a passband-flattened LiNbO/sub 3/ guided-wave acousto-optic tunable filter (AOTF). Passband flattening is achieved by approximating the predicted flattened-filter decaying-sine acoustic intensity drive function by two half cycles of a sine wave of successively lower intensity. These filters have a cross-state 3-dB passband of /spl sim/1.75 nm, equal to that of the apodized filters on which they are based, an approximately 1 nm wide flat region with>
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Jackel et al. (1995) studied this question.
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