Abstract
Because of the increased use of fiber-optic sensors and fiber-optic communications, signals applied to an optical signal processor are often optical, and thus optical A/D and D/A converters should handle optical input signals directly and be very fast. Optical A/D conversion has been demonstrated and proposed using an electro-optic waveguide [1], a liquid crystal device [2], and optical logic and a look-up table [3]. Optical D/A converters have also been proposed and demonstrated using electro-optic waveguide. Papuchon et al. [4] and Lewis et al. [5] used binary weighted electrodes and binary weighted neutral density filter arrays, respectively.