Optical antenna

Examples relates to optical communications between optical antennas and related methods. Examples relate to waveguide-based duplexing with point-ahead angle (PAA) implementation. In one example, there is provided an optical antenna (40) for a duplex link (400) formed by a transmit, Tx, beam (41) towards a partner optical antenna and a receive, Rx, beam (42) from the partner antenna, the optical antenna (40) comprising: a proximal optical path (40') including a bidirectional waveguide (43) for a duplex propagation of the duplex link (400) from at least one Tx source (41') of the Tx beam (41) and towards at least one receiver (42') of the Rx beam (42); a distal duplex optical path (40") for a duplex propagation of the duplex link (400) from and towards the partner optical antenna; a beam shaper (44) positioned in the distal optical path (40") to shape the duplex propagation pattern (50, 51, 51', 510, 512) of the duplex link (400); and a controller (45) to control the beam shaper (44) to adaptively shape the duplex propagation pattern (50, 51, 51', 510, 512) to enclose: a first partner antenna position (52) of the partner antenna at the instant of transmission of the Rx beam (42); and a second antenna position (53) of the partner antenna at the instant of reception of the Tx beam (41).