Lin, G.-R.G.-R.LinChi, Y.-C.Y.-C.ChiLi, Y.-C.Y.-C.LiGONG-RU LIN2020-06-112020-06-112013https://www.scopus.com/inward/record.uri?eid=2-s2.0-84873685785&doi=10.1109%2fJLT.2013.2241733&partnerID=40&md5=294e89154d320ef35b1e89c14ce19726A directly modulated and coherently injection-locked WRC-FPLD transmitter is preliminarily employed to perform the 16-QAM-OFDM data transmission by using an OFDM subcarrier amplitude pre-leveling technique. The maximum transmission bit-rate of 20-Gbit/s is reported by fusing the OFDM subcarrier pre-leveling with the coherent injection-locking techniques in such a directly modulated WRC-FPLD. Without pre-leveling the OFDM subcarrier, the coherently injection-locked L-band WRC-FPLD suppresses its mode-partition noise to improve the EVM of the 16-QAM-OFDM data only from 13.52% to 10.2%. The OFDM subcarrier pre-leveling effectively compensate the finite bandwidth and unflattened modulating response of the injection-locked WRC-FPLD to improve the transmission EVM and SNR performances. The received constellation plot reveals that the EVM and SNR of the back-to-back transmitted 16-QAM-OFDM data are significantly improved to 5.58% and 17 dB, respectively. With the use of both injection-locking and pre-leveling techniques, the directly 16-QAM-OFDM modulated WRC-FPLD transmitter can reach the FEC limited BER of 3.8 × 10-3 at a receiving power sensitivity of-10 dBm. The OFDM subcarrier pre-leveling technique helps the WRC-FPLD to reduce the overall BER of 16-QAM-OFDM data by one order of magnitude, providing a minimum BER of 4.5 × 10-5 at a receiving power of-2 dBm. © 2012 IEEE.Amplitude pre-leveling; coherent injection-locking; direct modulation; FPLD; QAM-OFDM; subcarrier; transmission; weak-resonant-cavityAmplitude pre-leveling; Direct modulation; FPLD; Injection-locking; QAM-OFDM; Subcarrier; weak-resonant-cavity; Data communication systems; Quadrature amplitude modulation; Signal to noise ratio; Transmissions; Transmitters; Orthogonal frequency division multiplexingUsing a L-band weak-resonant-cavity FPLD for subcarrier amplitude pre-leveled 16-QAM-OFDM transmission at 20 Gbit/sjournal article10.1109/JLT.2013.22417332-s2.0-84873685785