Abstract
Optical signal processing and computing require spatial as well as temporal dimensionality. We report thermally annealed cutoff modulator and modulator array that can provide wide modulation bandwidth and multi-channel optical signal processing capability. Experimental results for single channel device and modulator array are presented. A detailed theory is given to explain the theory and the working principle of cutoff modulator. The increase of linear dynamic range of the device after appropriate heat treatment is quantitatively explained. The improvement is due to the proper combination of the coupling condition and the heat-treatment perturbed, electric field induced attenuation coefficient. Modulator array with 333 channels/cm packing density and 1.6 GHz modulation bandwidth is also demonstrated experimentally. Further applications by utilizing the cutoff modulator array, such as addition and subtraction of two numbers and optical logic gate operations are realized also.
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