RCLED nonlinearity mitigation for polymer optical fiber communications

In order to mitigate the nonlinearity of resonant cavity light emitting diode (RCLED) in the step-index polymer optical fiber (SI-POF) communication, polynomial pre-distorter and look-up-table (LUT) pre-distorter are proposed in POF system to compensate the RCLED nonlinearity. Joint optimizations considering biasing current, electrical average signal power and modulation orders are carried out to make good trade-offs with system linearity. With the help of pre-distortion methodologies, 750Mbps compensated discrete multi-tone (DMT) transmissions over 50m SI-POF link are successfully implemented below the bit error rate (BER) of 10^-3 and more than 10dB BER performance improvement are achieved. The results illustrate that the proposed pre-distortion schemes are benefiting from higher power efficiency and exhibiting great resistance to nonlinearity, even could be well demodulated in the strong nonlinearity region, which demonstrates the feasibility and validity for RCLED nonlinearity mitigation in POF communication system.