Space division multiplexing in multicore fibers is one of the most promise technologies in order to
support transmissions of next-generation peta-to-exaflop-scale supercomputers and mega data centers, owing to
advantages in terms of costs and space saving of the new optical fibers with multiple cores. Additionally, multicore
fibers allow photonic signal processing in optical communication systems, taking advantage of the mode coupling
phenomena. In this work, we numerically have simulated an optical MIMO-OFDM (multiple-input multiple-output
orthogonal frequency division multiplexing) by using the coded Alamouti to be transmitted through a twin-core fiber
with low coupling. Furthermore, an optical OFDM is transmitted through a core of a singlemode fiber, using pilot-aided
channel estimation. We compare the transmission performance in the twin-core fiber and in the singlemode fiber taking
into account numerical results of the bit-error rate, considering linear propagation, and Gaussian noise through an optical
fiber link. We carry out an optical fiber transmission of OFDM frames using 8 PSK and 16 QAM, with bit rates values
of 130 Gb/s and 170 Gb/s, respectively. We obtain a penalty around 4 dB for the 8 PSK transmissions, after 100 km of
linear fiber optic propagation for both singlemode and twin core fiber. We obtain a penalty around 6 dB for the 16 QAM
transmissions, with linear propagation after 100 km of optical fiber. The transmission in a two-core fiber by using
Alamouti coded OFDM-MIMO exhibits a better performance, offering a good alternative in the mitigation of fiber
impairments, allowing to expand Alamouti coded in multichannel systems spatially multiplexed in multicore fibers.
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