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This paper introduces the concept of designing all optical orthogonal frequency division multiplexing (AO-OFDM) techniques to increase data rates to obtain a greater range of transmission. Arrayed waveguide grating (AWG) was proposed in this work as inverse fast fourier transform / fast fourier transform (IFFT/FFT) circuits in all optical orthogonal frequency division multiplexing system for its structure is simplified and capacity in large subcarriers. AWG combining with dense wave division multiplexing (DWDM) technique with 20 GHz channel spacing. The proposed system is simpler than others, which can obtain AO-OFDM and have efficiency in the spectrum. The output investigated for the proposed system is evaluated by applying different input power and transmission lengths to assess the quality of the signal via the bit error rate (BER) parameter. The simulation results show the constellation diagram and BER of the received signal with 8 channels, using quadrature amplitude modulation (QAM) and quadrature phase shift keying (QPSK) at (240 Gb/s) per channel.

international journal of intelligent engineering and systems

Design and Comprehensive Investigation of High Capacity Communication System Based on All Optical Orthogonal Frequency Division Multiplexing Processing