Abstract
We develop a measurement scheme for the time and frequency offsets, along with their compensation, for a coherent optical receiver. This relies on a modified constant amplitude zero autocorrelation sequence-based method, which is implemented on a field-programmable gate array. Experiments are performed for an optical orthogonal frequency-division multiplexing transmission system. The performance of the proposed scheme is compared to a MATLAB-based implementation of the original scheme. The contributory factors to the error between these two schemes, as well as the implementation complexity, are investigated. Experimental measurements demonstrate that the proposed scheme closely matches the performance of the original scheme while utilizing fewer hardware resources.
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