Throughput (η_p) and relative integration time () of a charge m = 2 vortex coronagraph on a microlens-fed single-mode fiber array. The diameter of the microlenses is varied from 1.4 to 2.0λ/D, and the mode field diameter is optimized for maximum throughput of an Airy pattern. The throughput of the SCAR coronagraph designed for 1.8λ/D microlens diameter was added for comparison. The assumed tip-tilt jitter is (left column) 0.05λ/D or (right column) 0.15λ/D rms. These values correspond to a best and worst case performance of the adaptive optics system. The throughput is calculated for the optimal position angle of the off-axis source (i.e. directly across an off-axis microlens).