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Optical Engineering

Experimental investigations in transmission performance of real-time long-reach adaptively modulated direct-detection optical-orthogonal frequency division multiplexing systems
Author(s): Ming Chen; Jing He; Jin Tang; Lin Chen
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Paper 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.

Paper Details

Date Published: 10 September 2014
PDF: 6 pages
Opt. Eng. 53(9) 096106 doi: 10.1117/1.OE.53.9.096106
Published in: Optical Engineering Volume 53, Issue 9
Show Author Affiliations
Ming Chen, Hunan Univ. (China)
Jing He, Hunan Univ. (China)
Jin Tang, Hunan Univ. (China)
Lin Chen, Hunan Univ. (China)

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