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We will present the development of a remote Precision Photonic Readout for Focal Plane Array Detectors. Its underlying principles, design and tests as well as limitations will be discussed. The design, in essence, constitutes a remote, via fiber optics, analog-to-digital converter, where the low level focal plane signals are encoded as differential optical phase shifts. These phase shifts are then recovered as digital numbers at a location external to the detector dewar. The input transducer, adoi:10.21236/ada387843 fatcat:qw3rwi2mnbgt5fwkpm7jcr2bbe