A visible laser light communication VLLC system using matlab vertical cavity floor emitting laser and spatial light modulator with hybrid CATV/16 QAM OFDM modulating signals over matlab 5 m free space link is proposed and proven. With matlab programming information of matlab push pull scheme, low noise amplifier, and equalizer, good performances of composite second order and composite triple beat are acquired, observed by an acceptable service to noise ratio performance for matlab CATV signal, and matlab low bit error rate value and clear constellation map are achieved for matlab 16 QAM OFDM signal. Such matlab hybrid CATV/16 QAM OFDM VLLC system can be appealing for offering amenities including CATV, Internet and telecommunication services. The possibility of polarization mode dispersion PMD reimbursement in fiber optic communication systems with direct detection using matlab simple channel estimation method and low density parity check LDPC coded orthogonal frequency division multiplexing OFDM is verified. It is shown that even for differential group delay DGD of 4/BW BW is matlab programming OFDM signal bandwidth, matlab programming degradation due to matlab programming first order PMD can be totally compensated for. Two categories of LDPC codes designed in line with two various combinatorial items difference programs and manufactured from combinatorial designs suitable to be used in PMD repayment are brought.