KEYWORDS: Single mode fibers, Digital signal processing, Critical dimension metrology, Dispersion, Phase shift keying, Four wave mixing, Phase shifts, Nonlinear optics, Modulation, Signal attenuation
Digital signal processing (DSP) based coherent detection attracts extensive studies recently. DSP technology simplifies
coherent detection and brings it more advantages and channel impairments can be compensated electrically. The lumped
dispersion compensation scheme makes the fiber link simple, flexible and potentially cost effective. However, such
pseudo-linear long haul transmission systems are greatly degraded by intra-channel nonlinearities at high bit rates. The
optical pulses are highly dispersed and overlap strongly during propagation, resulting serious intrachannel four-wave
mixing (IFWM). IFWM introduces pattern dependent nonlinear phase shifts to the signals. It has been pointed out that
IFWM induced phase noise are correlated from symbol to symbol. The autocorrelation function has been studied in
detail. Here we extend the result to fiber link with single mode fiber (SMF) for transmission only. We studied the
statistics of IFWM induced phase noise in Return to Zero-Differetnitally coded Quadrature Phase Shift Keying (RZDQPSK)
transmission systems with identical fiber spans and SMF fiber spans numerically. The results show that the
phase noise correlation of neighbouring bits is reduced for the latter one but the correlation length is increased with fiber
span number and chromatic dispersion value.
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