Notice of Violation of IEEE Publication Principles: Analysis of ACO-OFDM, DCO-OFDM and Flip-OFDM for IM/DD optical-wireless and optical-fiber system

Notice of Violation of IEEE Publication Principles

"Analysis of ACO-OFDM, DCO-OFDM and Flip-OFDM for IM/DD Optical-Wireless and Optical-Fiber System"
by Rizbi Hassan and Fatima Tuz Zafrin Tuli
in the Proceedings of the IEEE International Conference on Telecommunications and Photonics (ICTP), December 2015

After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles.

This paper contains portions of text from the paper(s) cited below. A credit notice is used, but due to the absence of quotation marks or offset text, copied material is not clearly referenced or specifically identified.

"Analysis of DCO-OFDM and Flip-OFDM for IM/DD Optical-wireless System"
by Rashed Islam, Pallab Choudhury, and Muhammad Ashiqul Islam
in the Proceedings of the International Conference on Electrical and Computer Engineering (ICECE), December 2014, pp. 32-35


The three types of orthogonal frequency division multiplexing techniques named Asymmetrically-clipped Optical OFDM (ACO-OFDM), DC biased Optical OFDM (DCO-OFDM) and Flip-OFDM systems are analyzed and compared in optical wireless and optical fiber system. Data are taken using MATLAB and the simulation software called Optisystem 13. The techniques are compared in terms of their bit error rate (BER) with respect to electrical energy to the noise power ratio (ES)/NS) in presence of additive white Gaussian noise in case of optical wireless channel and by thermal noise in case of optical fiber channel. Different forms of Quadrature Amplitude modulation (QAM) have been used for modulating the OFDM signal such as 4-, 16-, 64 and 256-QAMs. After the final analysis, it is seen that ACO-OFDM requires a lower power to reach the target BER of 10−4 compared to DCO-OFDM and Flip-OFDM in both optical wireless and fiber channels. In the last part, the three bipolar OFDM systems are analyzed by observing their receiver sensitivity using PIN photodiode in 25 km optical fiber channel. The result shows that ACO-OFDM has a better sensitivity than DCO-OFDM and Flip-OFDM.