Abstract
An analytical approach is developed to evaluate the amount of crosstalk due to inter-core coupling and its limitations on the Bit Error Rate (BER) performance of a fiber link length of 1000 m with a homogeneous multi-core optical fiber (MCF) with a direct detection receiver. Coupling coefficients due to inter-core coupling in 9, 7 and 3 core MCF are evaluated numerically for different core pitch. Crosstalk power, Signal to Crosstalk plus Noise Ratio (SCNR) and BER at any output core with light launched into other core of the MCF are determined numerically. Crosstalk is found to be more pronounced in 9 core and 7 core MCF compared to 3 core. It is found that there is significant deterioration in BER performance due to inter-core coupling induced crosstalk. Power penalty due to inter-core crosstalk at a BER of 10−9for a link length of 1000 m are found to be 2.5 dB, 1.50 dB and 0.5 dB for 9, 7 and 3 core MCF respectively. There is a minimum attainable BER corresponding to a given pitch and number of cores.
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