KEYWORDS: Receivers, Digital signal processing, Nonlinear optics, Dispersion, Wavelength division multiplexing, Single mode fibers, Data communications, Telecommunications, Modulation, Transmitters
We have numerically investigated the impact of non-linear impairments on the performance of 400Gbit/s DP-RZ-
QPSK transmission system over 1200km standard single mode fiber (SMF-28) having an average span
loss of 16dB and with no in-line optical dispersion compensation in the transmission link. Digital backward
propagation (DBP) algorithm based on split-step Fourier method (SSFM) is employed along with the coherent
receiver to compensate the fiber transmission impairments i.e. chromatic dispersion (CD) and non-linear (NL)
impairments. The system performance is monitored in terms of Q-value (calculated form BER) for various
signal input launch powers. We further quantify the impact of inter-channel non-linear impairments such
as cross-phase-modulation (XPM) and four-wave-mixing (FWM) on the performance of DBP algorithm by
investigating the multiple-channel transmission, i.e. 8x400Gbit/s DP-RZ-QPSK system. The results depict
efficient performance of DBP algorithm as compared to the system where only linear dispersion compensation
is implemented. This shows the promising impact of digital backward propagation algorithm on the high data-rate
transmission systems such as 400Gbit/s per single channel which is expected to be a possible data rate for
long-haul optical communication systems after 100Gb Ethernet in near future.
Digital Backward Propagation (DBP) algorithm for mitigating fiber dispersion and non-linearities based on modified
non-iterative symmetric split-step Fourier method (M-SSFM) is implemented and numerically evaluated.
The algorithm is modified by shifting the calculation point of non-linear operator (r) together with the optimization
of dispersion (D) and non-linear coefficient (γ) to get the optimum system performance. DBP is evaluated
for 10x10Gbit/s wavelength division multiplexed (WDM) system (a total transmission capacity of 100Gbit/s)
with RZ-DQPSK encoded signals over a transmission length of 1600km standard single mode fiber (SMF) with
no in-line optical dispersion compensation. Furthermore, we quantify the impact of optical add-drop multiplexers
(OADMs) in the transmission link. Modification of DBP parameters and bandwidth of optical filters associated
with OADMs give significant improvement in the system performance.
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