Fig. 1. Concept of non-interfering mode combining for FMF-FSO systems using TDM

Fig. 2. Experimental setup for FMF-FSO signal transmission with TDM-receiver. (a) Transmitter; (b) receiver; (c) time domain waveform after TDM-receiver; (d) DSP of transmitter; (e) DSP of receiver

Fig. 3. Spectrum of received signal

Fig. 4. Influence of MIMO-LMS/CMA-MRC algorithm on BER in structure without delay line. (a) Comparison of BER curves with and without MIMO-LMS/CMA-MRC algorithm; (b) constellation diagram at 0 dBm received power without MIMO-LMS/CMA-MRC algorithm; (c) constellation diagram at 0 dBm received power with MIMO-LMS/CMA-MRC algorithm

Fig. 5. Influence of MIMO-LMS/CMA-MRC algorithm on BER in structure with delay line. (a) Comparison of BER curves with and without MIMO-LMS/CMA-MRC algorithm; (b) constellation diagram at 6 dBm received power without MIMO-LMS/CMA-MRC algorithm; (c) constellation diagram at 6 dBm received power with MIMO-LMS/CMA-MRC algorithm

Fig. 6. FSO signal transmission experiment. (a) Schematic diagram; (b) experimental setup; (c) constellation diagram at -2 dBm received optical power without proposed algorithm; (d) constellation diagram at -2 dBm received optical power with proposed algorithm