A method for maintaining an optimized point ahead angle (θa) between an uplink beam from a first terminal to a second terminal, and a downlink beam from the second terminal to the first terminal, the method comprising - providing a communication link for optical communication between the first terminal and the second terminal, wherein the communication link comprises at least o a reception channel (Rx) wherein the first terminal receives data via the downlink beam from the second terminal, and o a transmission channel (Tx) wherein the first terminal transmits data via the uplink beam to the second terminal along an initial point ahead angle (θ0) with respect to the downlink beam; - while transmitting data via the transmission channel (Tx) from the first terminal to the second terminal, applying a directional variation (Δθ) to the initial point ahead angle (θ0) for emitting the uplink beam (U1,U2) along different point ahead angles (θ1,θ2) at different instances of time (tl,t2); - determining, at the second terminal, a respective intensity (I1,I2) of a part of the uplink beam (U1,U2), received by the second terminal, emitted by the first terminal along a respective point ahead angle (θ1,θ2); - communicating an indication of the respective intensity (I1,I2), determined by the second terminal, to the first terminal via the reception channel (Rx) and/or communicating an indication of the respective point ahead angle (θ1,θ2), used by the first terminal in emitting the uplink beam, to the second terminal via the transmission channel (Tx); and - adjusting, in the first terminal, the initial point ahead angle (θ0) towards an optimized point ahead angle (θa) based on the respective intensity (I1,I2), determined in the second terminal, as function of the different point ahead angles (θ1,θ2) at which the uplink beam (U1,U2) was emitted by the first terminal characterized in that the directional variation (Δθ) is applied by periodically tilting a point ahead mirror back and forth in accordance with a sinusoidal or sawtooth pattern having a period shorter than a roundtrip time between the terminals. - providing a communication link for optical communication between the first terminal and the second terminal, wherein the communication link comprises at least o a reception channel (Rx) wherein the first terminal receives data via the downlink beam from the second terminal, and o a transmission channel (Tx) wherein the first terminal transmits data via the uplink beam to the second terminal along an initial point ahead angle (θ0) with respect to the downlink beam; o a reception channel (Rx) wherein the first terminal receives data via the downlink beam from the second terminal, and o a transmission channel (Tx) wherein the first terminal transmits data via the uplink beam to the second terminal along an initial point ahead angle (θ0) with respect to the downlink beam; - while transmitting data via the transmission channel (Tx) from the first terminal to the second terminal, applying a directional variation (Δθ) to the initial point ahead angle (θ0) for emitting the uplink beam (U1,U2) along different point ahead angles (θ1,θ2) at different instances of time (tl,t2); - determining, at the second terminal, a respective intensity (I1,I2) of a part of the uplink beam (U1,U2), received by the second terminal, emitted by the first terminal along a respective point ahead angle (θ1,θ2); - communicating an indication of the respective intensity (I1,I2), determined by the second terminal, to the first terminal via the reception channel (Rx) and/or communicating an indication of the respective point ahead angle (θ1,θ2), used by the first terminal in emitting the uplink beam, to the second terminal via the transmission channel (Tx); and - adjusting, in the first terminal, the initial point ahead angle (θ0) towards an optimized point ahead angle (θa) based on the respective intensity (I1,I2), determined in the second terminal, as function of the different point ahead angles (θ1,θ2) at which the uplink beam (U1,U2) was emitted by the first terminal