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In this paper we analyze the power of Nonlinear Signal Inference ( NLSI p ) and optimize the coherent optical transmission system (COTS) based on PM-16QAM higher modulation format for different baud rates considering commercially available silica fiber (SF). Theoretically, this work follows up four Gaussian Noise (GN) models depending on multiple identical spans, non-Nyquist WDM system, non-identical spans and multichannels to confirm the better accuracy of these models. The most fitted model is then used to optimize the COTS achieved by analyzing the Amplified Spontaneous Emission noise power (PASE) to determine the optimum Optical Signal to Noise Ratio (OSNR). Matlab R2011b simulation tool is run here to generate the OSNR and Bit Error Rate (BER) performance curves for the COTS. The OSNR has been simulated considering input transmitting power per span, span length, dispersion and fiber loss coefficient. Results show that, the OSNR penalty is around 3dB and 6dB when line rate is multiplied with the factor of 2xbit rate, 4x bit rate respectively for same modulation and demodulation formats in the COTS.

Analysis of Nonlinear Signal Interference to Optimize the Coherent Optical Transmission System