Title :
Novel Non-Data-Aided Clock Recovery Method for DP-QPSK Systems With CMA Equalizers
Author :
Portela, Thiago F. ; Mello, Darli A A
Author_Institution :
Dept. of Electr. Eng., Univ. of Brasilia, Brasilia, Brazil
Abstract :
We propose a novel non-data-aided clock recovery method for differential quadrature phase-shift keying optical systems based on the coefficients of the constant modulus algorithm (CMA) adaptive equalizer. The new technique exhibits a satisfactory performance under certain combinations of differential group delay (DGD) and state of polarization, in which the traditional Gardner algorithm fails. The robustness of the proposed algorithm against chromatic dispersion, DGD, and state of polarization variations is demonstrated experimentally.
Keywords :
adaptive equalisers; delays; light polarisation; optical communication; optical dispersion; quadrature phase shift keying; synchronisation; CMA equalizer; DGD; Gardner algorithm; adaptive equalizer; chromatic dispersion; constant modulus algorithm; differential group delay; differential quadrature phase shift keying; nondata aided clock recovery method; optical system; state of polarization; Adaptive optics; Bit error rate; Clocks; Equalizers; Optical distortion; Synchronization; Chromatic dispersion; clock and data recovery; constant modulus algorithm; differential group delay; digital signal processing; optical communication system;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2212880
