QUEBEC CITY, March 29 -- TeraXion Inc., a maker of optical filters for industrial applications and high-speed communication networks, announced it has acquired DiCOS Technologies, a private company with expertise in the control and stabilization of optical frequencies. DiCOS products stabilize the frequency of light sources, such as lasers, to a precision comparable to atomic clocks. Such sources are used in defense and aerospace applications of spectroscopy, metrology and telemetry, allowing for very precise measurement of distances. 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