Research on dispersion compensation for OFDM signal fiber transmission
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Corresponding author:
CHEN Lin, liliuchen12@126.com
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Received Date:
2010-01-07
Accepted Date:
2010-04-14
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Abstract
In order to reduce the impact of fiber chromatic dispersion on the transmission performance of an orthogonal frequency division multiplexing (OFDM) system, a channel estimator was introduced into the system. The influence of fiber chromatic dispersion on OFDM signals transmission in optical fiber was theoretically investigated. And the performance of an OFDM system with a channel estimator based on combined pilots and the least square estimation was demonstrated in the experiment. The amplitude response and phase response for the OFDM system showed that the optical OFDM signal modulated by a direct modulator can transmit 200km in the single-mode dispersion fiber. The bit error rate was less than 10-6 and the power penalty was smaller than 2dB.The results show that fiber chromatic dispersion plays a stronger impact on high frequency subcarrier than low frequency subcarrier. The proposed method can effectively compensate the phase shift and amplitude attenuation caused by fiber chromatic dispersion.
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