Semtechâ€™s GN3357 APD ROSA is a fully integrated device with design features that ensure excellent RF stability, together with high sensitivity. The GN3357 offers excellent performance in low OSNR environments, coupled with low power consumption. Automatic Gain Control (AGC) is employed to maximize the dynamic range over which linearity is maintained. This enables state of the art sensitivity for both stressed and unstressed data. The GN3357 optical design is optimised for very low back-reflection.