Study of IQ imbalance effect in direct-detection optical OFDM systems

2009 ◽  
Author(s):  
Xinying Li ◽  
Yufeng Shao ◽  
Shumin Zou ◽  
Chunning Hou ◽  
Xi Zheng ◽  
...  
Keyword(s):  
Direct Detection ◽  
Ofdm Systems ◽  
Iq Imbalance ◽  
Optical Ofdm

Study of IQ Imbalance Effect in Direct-Detection Optical OFDM Systems

2009 ◽  
Author(s):  
Xinying Li ◽  
Yufeng Shao ◽  
Shumin Zou ◽  
Chunning Hou ◽  
Xi Zheng ◽  
...  
Keyword(s):  
Direct Detection ◽  
Ofdm Systems ◽  
Iq Imbalance ◽  
Optical Ofdm

scholarly journals Theoretical and Experimental Investigation of Direct Detection Optical OFDM Systems with Clipping and Normalization

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Jiang Wu ◽  
Zhongpeng Wang
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Direct Detection ◽  
Single Mode ◽  
Superior Performance ◽  
Ofdm Systems ◽  
Ofdm System ◽  
Transmission Scheme ◽  
Awgn Channel ◽  
Ofdm Signal ◽  
Optical Ofdm

A data clipping and normalization technique is employed to improve the performance of the overall direct detection optical orthogonal frequency division multiplexing (DCO-OFDM) system. A detailed analysis of clipping distortion introduced by digital clipping and normalization is provided. The normalization operation amplifies the clipped data signal to the maximum input amplitude of a digital-to-analog converter (DAC). Based on the analysis, a BER formula of the proposed scheme is derived over the AWGN channel and single fiber channel. Performance of an optical clipped OFDM with normalization is assessed through numerical simulations and Monte Claro simulation over the AWGN channel. Theoretical analysis and simulation results both show that the clipping and normalization scheme can greatly improve the BER of an optical OFDM. In particular, BER performance of the proposed transmission scheme was measured in a practical OFDM transmission platform. The measured experimental results show that the clipped and amplified OFDM signal exhibits superior performance in comparison with the conventional OFDM signal. The received sensitivity at a BER of 10−3 for a 4 Gsamples/s (2.6667 Gbits/s) clipped and normalized OFDM signal with clipping ratio of 4 after 100 km standard single-mode fiber (SMF) transmission was improved by 4.3 dB when compared with the conventional OFDM system. The measured results also showed that the clipped OFDM signal exhibits superior performance in comparison with the conventional OFDM signal. Therefore, a clipping and normalization at the transmitter is most effective, and a substantial performance improvement can be obtained by a simple normalization after clipping.

A novel timing offset estimation method for direct-detection optical OFDM systems

2013 ◽  
Vol 19 (6) ◽  
pp. 523-528
Author(s):  
Xu Di ◽  
Lin Chen ◽  
Jiangnan Xiao ◽  
Ming Chen ◽  
Jing He ◽  
...  
Keyword(s):  
Direct Detection ◽  
Estimation Method ◽  
Ofdm Systems ◽  
Timing Offset ◽  
Optical Ofdm

All-optical in-band OSNR measurement in intensity-modulated direct-detection optical OFDM systems

2013 ◽  
Author(s):  
Josep M. Fabrega ◽  
Pascual Sevillano ◽  
Michela Svaluto Moreolo ◽  
Juan Jose Martinez ◽  
Asier Villafranca ◽  
...  
Keyword(s):  
Direct Detection ◽  
Ofdm Systems ◽  
Intensity Modulated ◽  
All Optical ◽  
Optical Ofdm
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