Demonstration of modulating retro‐reflection free‐space optical transmission using 80 Gb/s Pol‐MUX QPSK signal in simulated atmosphere environment

The authors experimentally demonstrate a modulating retro-reflector based on electro-optical in-phase quadrature modulator and test it in an atmospheric cell simulated atmosphere environment by using 80 Gb/s polarisation-multiplexing quadrature phase-shift keying (Pol-MUX QPSK) signals. At the BER of 1 × 10 -3 , the power penalties of the x - and y -polarisation signals are both <;1.1 dB when the temperature difference in the atmospheric cell is <;250°C.