Home > Archive>Volume 12, Issue 5, 2016 >361-365. DOI:10.1007/s11801-016-6176-1
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A full-duplex optical access system with hybrid 64/16/ 4QAM-OFDM downlink
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Key Laboratory of Signal and Information Processing, College of Electronic & Information Engineering, Chongqing Three Gorges University, Wanzhou 404100, China

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    Abstract:

    A full-duplex optical passive access scheme is proposed and verified by simulation, in which hybrid 64/16/4-quadrature amplitude modulation (64/16/4QAM) orthogonal frequency division multiplexing (OFDM) optical signal is for downstream transmission and non-return-to-zero (NRZ) optical signal is for upstream transmission. In view of the transmitting and receiving process for downlink optical signal, in-phase/quadrature-phase (I/Q) modulation based on Mach-Zehnder modulator (MZM) and homodyne coherent detection technology are employed, respectively. The simulation results show that the bit error ratio (BER) less than hardware decision forward error correction (HD-FEC) threshold is successfully obtained over transmission path with 20-km-long standard single mode fiber (SSMF) for hybrid downlink modulation OFDM optical signal. In addition, by dividing the system bandwidth into several sub-channels consisting of some continuous subcarriers, it is convenient for users to select different channels depending on requirements of communication.

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HE Chao, TAN Ze-fu, SHAO Yu-feng, CAI Li, PU He-sheng, ZHU Yun-le, HUANG Si-si, LIU Yu. A full-duplex optical access system with hybrid 64/16/ 4QAM-OFDM downlink[J]. Optoelectronics Letters,2016,12(5):361-365

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  • Received:August 10,2016
  • Online: September 06,2016
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