Improving the spectral efficiency of a DWDM system using the QPSK multi-level modulation technique
Keywords:
spectral efficiency, Dense Optical Wavelength Division Multiplexing System DWDM, Quadrature phase shift Keying (QPSK), coherent detection, digital signal processingAbstract
In this Research, a dense optical wavelength division multiplexing system using Quadrature phase shift Keying DWDM QPSK was designed and
implemented, that enables Designing with high spectral efficiency, and the ability to transmit at high transmission rates, with applying coherent detection and digital signal processing. These techniques allow a high tolerance to carrier phase noise, and lead to Better compensation for nonlinearity, as well as compensation for chromatic dispersion and polarization pattern dispersion. The simulation was carried out in an Opti system 17 environment, and the results were tested and evaluated based on the achieved spectral efficiency and transmission capacity as well as the parameters Q-factor, BER (Bit Error rate), SER (Symbol Error rate) and OSNR.
The DWDM DP-QPSK system was designed with 32 channels and each channel at a rate of 100Gb/s at a total rate of (3.2 Tb/s) and a spacing between channels of 50GHz, which gives a spectral efficiency of (2b/s/Hz) and the results were tested for a range of 160km.
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