High-power optical fibers are displacing traditional bulk optical elements in applications such as laser sources, optical amplifiers, and beam delivery systems. However, their high signal or pump powers, large spot sizes or mode areas, and large fiber diameters pose interconnection difficulties including signal loss, mode conversion, polarization crosstalk, reflections, localized heating, end facet damage, and even catastrophic device failure. Various technologies have been developed to address these difficulties including mode field matching technologies, high-power fiber terminations, modal content measurements, and large-diameter fiber cleavers and fusion splicers. This course provides attendees with both conceptual and practical knowledge concerning high-power optical fiber interconnection.