TY - JOUR
T1 - Multi-span digital non-linear compensation for dual-polarization quadrature phase shift keying long-haul communication systems
AU - Asif, Rameez
AU - Lin, Chien Yu
AU - Holtmannspoetter, Michael
AU - Schmauss, Bernhard
N1 - Funding Information:
The authors gratefully acknowledge the funding of the Erlangen Graduate School in Advanced Optical Technologies (SAOT) by the German National Science Foundation (DFG) in the framework of the excellence initiative.
PY - 2012/4/1
Y1 - 2012/4/1
N2 - We have numerically investigated a method to reduce the complexity of the digital backward propagation algorithm (DBP). A filtered logarithmic step-size based split-step Fourier method (SSFM) is investigated in this paper to digitally compensate chromatic dispersion (CD) and non-linearities (NL) in dual-polarization quadrature phase shift keying (DP-QPSK) systems. The algorithm was evaluated for coherently-detected multiple channel DP-QPSK system over un-compensated transmission links with diverse baud-rates i.e. 14 GBaud, 28 GBaud and 56 GBaud. The results depict efficient mitigation of CD and NL, therefore improving the non-linear threshold point (NLT) by 4 dB. Furthermore by implementing a low-pass-filter (LPF) in each DBP stage, the required number of DBP stages are significantly reduced (multi-span DBP) by 75%. The results delineate improved system performance of logarithmic step size based filtered DBP (FL-DBP) both in terms of efficiency and complexity which will be helpful in future deployment of DBP algorithm with real-time signal processing modules for non-linear compensation.
AB - We have numerically investigated a method to reduce the complexity of the digital backward propagation algorithm (DBP). A filtered logarithmic step-size based split-step Fourier method (SSFM) is investigated in this paper to digitally compensate chromatic dispersion (CD) and non-linearities (NL) in dual-polarization quadrature phase shift keying (DP-QPSK) systems. The algorithm was evaluated for coherently-detected multiple channel DP-QPSK system over un-compensated transmission links with diverse baud-rates i.e. 14 GBaud, 28 GBaud and 56 GBaud. The results depict efficient mitigation of CD and NL, therefore improving the non-linear threshold point (NLT) by 4 dB. Furthermore by implementing a low-pass-filter (LPF) in each DBP stage, the required number of DBP stages are significantly reduced (multi-span DBP) by 75%. The results delineate improved system performance of logarithmic step size based filtered DBP (FL-DBP) both in terms of efficiency and complexity which will be helpful in future deployment of DBP algorithm with real-time signal processing modules for non-linear compensation.
KW - Coherent receiver
KW - Digital backward propagation
KW - Dispersion
KW - Non-linearities
KW - Optical fiber communication
KW - Phase modulation
UR - http://www.scopus.com/inward/record.url?scp=84856211762&partnerID=8YFLogxK
U2 - 10.1016/j.optcom.2011.11.120
DO - 10.1016/j.optcom.2011.11.120
M3 - Article
AN - SCOPUS:84856211762
VL - 285
SP - 1814
EP - 1818
JO - Optics Communications
JF - Optics Communications
SN - 0030-4018
IS - 7
ER -