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We propose an optically generated pilot tone aided carrier phase recovery scheme in dual-carrier Nyquist-mQAM systems. Both side channels can be compensated using one pilot, providing a high linewidth tolerance with small complexity.
A low noise multi-carrier generation scheme using optical FIR filter for ASE noise suppressing is proposed. 50 and 69 low noise carriers are generated experimentally, having much higher carrier-to-noise-ratio values of 22.5dB and 19.1dB.
We propose a joint multi-polarization-effect tracking and equalization method based on two extended Kalman filters, which can cope with state of polarization (SOP) tracing, polarization demultiplexing, equalization for polarization dependent loss (PDL) and polarization mode dispersion (PMD) in PDM-M-QAM coherent optical communication system. The… (More)
In this paper, an improved multi-carrier generation scheme based on single-side-band recirculating frequency shifter with optical finite impulse response (FIR) filter for amplified spontaneous emission (ASE) noise suppression is proposed and experimentally demonstrated. The carrier-to-noise-ratio (CNR) instead of tone-to-noise-ratio (TNR) is introduced to… (More)