We present a novel shape memory alloy-based optical fiber splicing device that can provide robust, low loss, and high power handling splices between single-mode fibers of identical or entirely different glass compositions. The achieved splice loss was as low as $0.12\mathrm{dB}$ between two SMF-28 fibers with an average value of $0.23\mathrm{dB}$ . To the best of our knowledge, this is the first demonstration of a purely mechanical splicing device that can withstand optical powers in excess of $10\mathrm{W}$ with various combinations of silica and fluoride fibers. The device can be used in moderate to high power all-fiber components, especially those involving junctions unsuitable to fusion splicing, such as fiber lasers and amplifiers based on fluo ride, chalcogenide, or microstructured fibers.