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This paper describes a CMOS imaging receiver for free-space optical (FSO) communication links. The die contains 256 parallel receive channels with -47 dBm optical sensitivity and 30 dB optical dynamic range. Arbitration circuitry multiplexes the data to a common bus. The 1.6 M transistor mixed-signal circuit is realized in 0.25 µm CMOS and measures 6.5 × 6.5 mm 2 . Reception at 500 kbps through a 1 km turbulent channel is demonstrated with 10 mW optical transmit power.doi:10.1109/jssc.2005.848148 fatcat:2hy35ghc4jcglawflg46xbtyxi