Article

Analytical estimation of phase noise influence in coherent transmission system with digital dispersion equalization.

Royal Institute of Technology, Stockholm, SE-16440, Sweden.
Optics Express (impact factor: 3.59). 04/2011; 19(8):7756-68.
Source: PubMed

ABSTRACT We present a novel investigation on the enhancement of phase noise in coherent optical transmission system due to electronic chromatic dispersion compensation. Two types of equalizers, including a time domain fiber dispersion finite impulse response (FD-FIR) filter and a frequency domain blind look-up (BLU) filter are applied to mitigate the chromatic dispersion in a 112-Gbit/s polarization division multiplexed quadrature phase shift keying (PDM-QPSK) transmission system. The bit-error-rate (BER) floor in phase estimation using an optimized one-tap normalized least-mean-square (NLMS) filter, and considering the equalization enhanced phase noise (EEPN) is evaluated analytically including the correlation effects. The numerical simulations are implemented and compared with the performance of differential QPSK demodulation system.

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Keywords

112-Gbit/s polarization division multiplexed quadrature phase shift keying
 
coherent optical transmission system
 
correlation effects
 
differential QPSK demodulation system
 
EEPN
 
electronic chromatic dispersion compensation
 
novel investigation
 
numerical simulations
 
optimized one-tap normalized least-mean-square
 
PDM-QPSK
 
phase estimation
 
time domain fiber dispersion finite impulse response
 

Tianhua Xu