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We have newly developed a digital optical-FPU. It has more margin to atmospheric optical transmission than any conventional analog optical-FPU, by using the D-3 format VTR's digital signal processings. Accordingly, we need not an automated direction adjustment control. Instead, this FPU is equipped with an simple mechanism varying radiating beam width as a countermeasure to vibration, from viewpoints of cost and portability. We have recognized in field tests that this new optical-FPU has high operations reliability.
