Title :
High-Level QAM OFDM System Using DML for Low-Cost Short Reach Optical Communications
Author :
Fan Li ; Xinying Li ; Lin Chen ; Xia, Y. ; Ge, C. ; Chen, Y.
Author_Institution :
Hunan Univ., Changsha, China
Abstract :
In this letter, we experimentally demonstrated a high level quadrature amplitude modulation (QAM) optical orthogonal frequency division multiplexing (OFDM) transmission system utilizing a cost-effective directly modulated laser. This experiment was enabled by intrasymbol frequency-domain averaging-based channel estimation, large fast Fourier transform size to enhance the resistance of intersymbol interference, and the discrete Fourier transform-spread technique to reduce peak-to-average power ratio. A 31.7-Gbit/s 2048QAM OFDM signal can be successfully transmitted over 20-km large effective area fiber under a 20% soft-decision forward-error-correction threshold (bit error rate of 2.4 × 10-2).
Keywords :
Fourier transform optics; OFDM modulation; channel estimation; discrete Fourier transforms; error statistics; forward error correction; intersymbol interference; optical fibre networks; optical modulation; quadrature amplitude modulation; 20-km large effective area fiber; 2048QAM OFDM signal; DML; bit error rate; bit rate 31.7 Gbit/s; directly modulated laser; discrete Fourier transform-spread technique; fast Fourier transform size; high level quadrature amplitude modulation optical orthogonal frequency division multiplexing transmission system; high-level QAM OFDM system; intersymbol interference; intrasymbol frequency-domain averaging-based channel estimation; low-cost short reach optical communication; peak-to-average power ratio; size 20 km; soft-decision forward-error-correction threshold; Bit error rate; OFDM; Optical attenuators; Optical fibers; Optical receivers; Optical sensors; Optical orthogonal frequency division multiplexing (OFDM); discrete Fourier transform-spread (DFT-spread); intra-symbol frequency-domain averaging (ISFA); large fast Fourier transform (FFT) size;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2309660
