Experimental investigations in transmission performance of real-time long-reach adaptively modulated direct-detection optical-orthogonal frequency division multiplexing systems

Ming Chen; Jing He; Jin Tang; Lin Chen

doi:10.1117/1.OE.53.9.096106

10 September 2014 Experimental investigations in transmission performance of real-time long-reach adaptively modulated direct-detection optical-orthogonal frequency division multiplexing systems

Ming Chen, Jing He, Jin Tang, Lin Chen

Author Affiliations +

Funded by: National Natural Science Foundation of China, Natural Science Foundation of China, National Natural Science Foundation of China (NSFC), Hunan Provincial Natural Science Foundation of China, National “863” High Tech Research and Development Program of China

Optical Engineering, Vol. 53, Issue 9, 096106 (September 2014). https://doi.org/10.1117/1.OE.53.9.096106

Abstract

A real-time base-band orthogonal frequency division multiplexing (OFDM) transceiver with symbol synchronization, channel equalization, sampling clock frequency synchronization, and adaptive modulation technique is successfully implemented by field programmable gate arrays and a 2.5-GSps digital-to-analog converter and analog-to-digital converter. The real-time optical OFDM signal at a raw bit rate of 5.156 Gbps within about 1.1-GHz bandwidth transmission over 100-km standard single-mode fiber (SSMF) is experimentally investigated in a simple intensity-modulation and direct-detection system. The experimental results show that the real-time system has a good bit error rate (BER) performance by using an adaptive modulation technique according to the conditions on the subchannels. After 100-km SSMF transmission, at a BER of 1×10⁻³, the power penalty is <1 dB. Moreover, there is a negligible penalty between the off-line and real-time digital signal processing results.

Citation Download Citation

Ming Chen, Jing He, Jin Tang, and Lin Chen "Experimental investigations in transmission performance of real-time long-reach adaptively modulated direct-detection optical-orthogonal frequency division multiplexing systems," Optical Engineering 53(9), 096106 (10 September 2014). https://doi.org/10.1117/1.OE.53.9.096106

Published: 10 September 2014

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