Abstract
Results are presented for InP and GaAs MMIC (monolithic microwave integrated circuit) photoconductive three-wave mixers. In these mixers two optical signals offset by 33 GHz are multiplied together with a microwave signal, all within the same device, to produce a low-frequency IF signal of a few hundred megahertz. The results are compared with the theory in which it is shown that these detectors are capable of operation up to millimeter wavelengths with 10% bandwidths and ideal sensitivities often better than those of ideal photodiodes. These mixers can be used for coherent detection and downconversion of optical signals and as optoelectronic phase detectors. >
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