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Scirj Volume IV, Issue VIII, August 2016 Edition
ISSN: 2201-2796

In Presence of FWM, Optical Fiber Communication Performance Analysis with OFDM-QAM

Md Imtiaz Uddin Johan, Md.Ishrat Islam, Fahim Ahmed Shakil, Marzia Mohiuddin

Abstract: The theoretical performance of optical fiber communication based on orthogonal frequency division multiplexing (OFDM) system along with quadrature amplitude modulation (QAM) has been analyzed in the presence of four-wave mixing (FWM). The influence of dispersion and FWM induced crosstalk on the OFDM spectrum is investigated with different fiber lengths, bit rates, number of channels, number of optical amplifiers and their gains and source line widths. The optical non linearity in a single-mode fiber imposes a fundamental limitation on the capacity of orthogonal frequency-division multiplexed (OFDM) system. The receiver sensitivity degradation is determined at number of bit error rate 10-9 for direct detection P-i-N receiver with number of OFDM channel, symbols and other system impairments associated with the proposed system. It is found that, FWM-induced crosstalk in presence of GVD severely degrades the system performance when the fiber input powers a large and/or the channel spacing is too small. The theoretical results obtained from the proposed system demonstrate that the system having 32 OFDM channels suffer power penalty of 0.51 dB due to the combined influence of FWM for fiber length 50 km and bit rate 2.5Gb/s. The power penalty is found to be 2.09 dB for the same number of channels and fiber length at bit rate 5Gb/s. Simultaneously our results also demonstrate the system performance severely degrades when number of OFDM channels exceed over 16, the BER performance degrades due to presence of FWM crosstalk .

Reference this Paper: In Presence of FWM, Optical Fiber Communication Performance Analysis with OFDM-QAM by Md Imtiaz Uddin Johan, Md.Ishrat Islam, Fahim Ahmed Shakil, Marzia Mohiuddin published at: "Scientific Research Journal (Scirj), Volume IV, Issue VIII, August 2016 Edition, Page 39-56 ".

Search Terms: Quadrature Amplitude Modulation, Four Wave Mixing, Orthogonal Frequency Division Multiplexing, Group Velocity Dispersion, Bit Error Rate, Time Division Multiplexing

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