Enhancing Performance of Optical Link using Integrated DWDM and Flip- OFDM for High Speed Optical Communication Systems
T. Beni Steena1, P. Indira2, M. Geethalakshmi3
1T. Beni Steena, Department of Electronics and Communication, Kongunadu College of Engineering and Technology, Thottiam, Trichy (Tamil Nadu), India.
2P. Indira, Department of Electronics and Communication, Kongunadu College of Engineering and Technology, Thottiam, Trichy (Tamil Nadu), India.
3M. Geethalakshmi, Department of Electronics and Communication, Kongunadu College of Engineering and Technology, Thottiam, Trichy (Tamil Nadu), India.
Manuscript received on 05 February 2019 | Revised Manuscript received on 18 February 2019 | Manuscript Published on 04 March 2019 | PP: 9-12 | Volume-7 Issue-5S2 January 2019 | Retrieval Number: ES1997017519/19©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The main advantages of the optical transmission media such as wide bandwidth, high bit rate with large channel capacity made it most favorable delivering transmission media. In this paper we consider flip-OFDM along with DWDM. Both techniques have different hardware complexities. The Dense Wavelength Division Multiplexing (DWDM) network is reshaping the landscape of communication networks. To compensate dispersion effects in optical wireless communication we use OFDM. We convert bipolar OFDM signals to unipolar OFDM symbol is to add a DC bias. This is known as DC offset OFDM. DC bias depends on the value of PAPR, which is large for OFDM. To lower DC bias values we use clipped negative time samples. Which results in Inter-carrier Interference and out of band optical power. DC bias is avoided by Asymmetric clipped optical OFDM. Only positive (odd) subcarriers carry information and negative values are clipped at the transmitter. The performance were still improved by Flip-OFDM, the positive and negative parts are extracted from bipolar OFDM real time domain signal and transmitted in two consecutive OFDM symbols. Both frames are positive samples since negative part is flipped before transmission. Thus Flip OFDM is a unipolar technique that can be used in optical wireless communication. In this paper we review and analyse Flip-OFDM and suggests further improvements. The future based DWDM based integrated services are also discussed. It is clear that the proposed system can provide tremendous improvement in BER performance and high data rate which is well suited for future applications. The simulations are performed by MATLAB.
Keywords: Flip-OFDM, DWDM, PAPR.
Scope of the Article: Optical Communication