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Photonic circuits are the key to advanced functionality in future optical systems, as they efficiently process terabit/s data streams. This paper reviews how photonic circuit topologies have evolved to support high-spectral efficiency modulation formats, including: all-optical optical frequency division multiplexing (AO-OFDM), discrete Fourier transform spread OFDM (DFT-S-OFDM), Nyquist wavelength...
Joint polarization-state and phase noise tracking is demonstrated using an unscented Kalman filter. Experimentally this outperforms CMA and extended Kalman filters (EKF) and a less complex modified version outperforms CMA and EKF at higher OSNRs.
We experimentally compare Nyquist-WDM and continuous DFT-S-OFDM systems with 16×64-Gb/s PDM-16QAM signals over 800-km SSMF. The DSP implementations of both systems with fractional oversampling rate are investigated, experimental results show that Nyquist-WDM system performs better with the same processing complexity.
We present experimental results detailing the performance of terabit per second super-channels with varied sub-channel baud rates. We find that nonlinear penalties are minimized when using 3–4 Gbd for 4800 km transmission.
Implicit training for channel estimation in long-haul single-carrier polarization-multiplexed coherent optical systems has been experimentally demonstrated. Improved performance can be achieved by applying iterative channel estimation for up to 1900-km QPSK and 1000-km 16-QAM transmissions.
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