Using a L-band weak-resonant-cavity FPLD for subcarrier amplitude pre-leveled 16-QAM-OFDM transmission at 20 Gbit/s

Gong Ru Lin*, Yu Chieh Chi, Yi Cheng Li, Jyehong Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


A 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.

Original languageEnglish
Article number6416909
Pages (from-to)1079-1087
Number of pages9
JournalJournal of Lightwave Technology
Issue number7
StatePublished - 2013


  • Amplitude pre-leveling
  • FPLD
  • coherent injection-locking
  • direct modulation
  • subcarrier
  • transmission
  • weak-resonant-cavity


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