According to an aspect of the invention, a system has a transmitter and a receiver, the transmitter beam source 210 and an optical element (220). Beam source 210 generates a beam 212, representing the information, the optical element 220 by changing the beam 212, the beam 222 so as to have a uniform intensity across the cross-sectional area. The receiver is separated from the transmitter by a free space beam 222 is spread, and an active region located to receive a portion of the beam 222 to the receiver for converting the received signal. To accommodate possible misalignment (misalignment), the cross-sectional area of the beam 222 is larger than the active region by an amount to accommodate the misalignment range of the receiver and the transmitter. ; misaligned, a transmitter, a receiver, a beam, a free space, the optical device, the electrical signal
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