Experimental Demonstration of CO-OFDM Systems Using Superimposed Pilot

We investigate the superimposed pilot (SP)-based channel estimation (CE) for long-haul coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. With specifically designed SP, we demonstrate the impacts that both SP and phase noise have on the performance of CE, from which we ob...

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Bibliographic Details
Published in:IEEE photonics technology letters 2014-08, Vol.26 (15), p.1573-1576
Main Authors: Guo, Changjian, Liu, Haipeng, Huang, Lingchen, Zhang, Han
Format: Article
Language:English
Subjects:
Bit error rate
Channels
Gain
Lasers
Noise
OFDM
Optical fibers
Optical noise
Optical receivers
Optical transmitters
Optimization
Orthogonal Frequency Division Multiplexing
Pilots
Spectra
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Summary:We investigate the superimposed pilot (SP)-based channel estimation (CE) for long-haul coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. With specifically designed SP, we demonstrate the impacts that both SP and phase noise have on the performance of CE, from which we obtain the optimal signal-to-pilot power ratio. To enhance the estimation quality of the SP-aided scheme, we exploit an iterative decision feedback algorithm, and in turn, improve the system performance. Experimental results show that the SP-aided CE behaves robust to the phase noise when lasers with moderate linewidth (
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2014.2329394