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We investigate the performance of data-aided coherent optical systems under different training sequence lengths and propose an adaptive length frame synchronization method that can adapt with required tracking speed and training sequence lengths. The technique is verified through simulations and experiments with good and stable performance after 1000 km transmission.
We propose an optical signal-to-noise ratio (OSNR) estimation technique using self-equalized complementary Golay sequences for both QPSK and 16-QAM coherent optical systems. The training sequences have complementary spectra, which enable accurate channel estimation and equalization, and have length-independent constellation for high-performance estimation. Estimation performances are verified through...
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