Performances of OFDM/OQPSK Modulation for Optical High Speed Transmission in Long Haul Fiber Over 1600 Km
Orthogonal Frequency Division Multiplex (OFDM) is a high-speed transmission technique widely studied in wireless networks. Its potential presents it as an ideal solution for high-speed transmission in optical fiber networks. This study presents the OFDM modulation associated with Offset Quadrature Phase Shift Keying (OQPSK) filtered using a filter banks for an optical transmission at the rate of 10 GB/s over 1600 Km in a single mode fiber (SMF). The simulations are performed in the VPI Photonics software environment. The results show that the filtered OFDM/OQPSK provides better transmission performance than the Classical OFDM/QPSK firstly because it does not require equalization to certain distances; secondly distances are greater than those achieved with the conventional OFDM in similar studies. In this study the bandwidth is maximized because we do not use the cyclic prefix (CP). Moreover the complexity of transmitters and receivers is reduced, which shows OFDM/OQPSK as an effective solution to combat the effects of the chromatic dispersion (CD), the polarization mode dispersion (PMD), the inter-symbol interference (ISI) and nonlinearities.
