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Phase noise mitigation in coherent transmission system using a pilot carrier

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Figure

Fig. 1. Scheme of equalization enhanced phase noise in coherent transmission system. MZI: Mach-Zehnder interferometer, ΦTX: phase fluctuation of the TX laser, ΦLO: phase fluctuation of the LO laser, N(t): additive white Gaussian noise, ADC: analog-to-digit
Fig. 2. Phase estimation using the one-tap NLMS filter with different value of step size, μ is the step size
Fig. 4. Schematic of 28-Gsymbol/s NRZ-QPSK coherent transmission system with polarization multiplexed pilot carrier
Fig. 5. Carrier phase estimation using NLMS filter for 2000 km fiber transmission, (a) TX linewidth is 170 MHz, LO linewidth is 0Hz, (b) both TX and LO linewidth are 5 MHz

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