Secure Bidirectional Transmission in a WDM-PON Architecture Employing RSOA-Based Remodulation Scheme

A novel architecture of bidirectional wavelength division multiplexed passive optical network (WDM-PON), based on forward error correcting (FEC) scheme, has been proposed and analyzed theoretically. This configuration is made economical by employing injection locked Fabry-Perot laser diode (FPLD) for direct modulation at transmitter end and reflective semiconductor optical amplifier (RSOA) as remodulator at receiver end. Reed-Solomon (RS) codec is preferred in the design to comprehend the FEC scheme. The RS (255, 251) codec is realized by field-programmable-gate-array (FPGA) with the help of VERILOG programming. Excellent transmission performances of 10 Gbps data-signal over maximum of 20 km SMF in downlink and uplink are obtained by the low bit error rate (BER) values and significant eye diagrams at BER analyzer.