In recent years, the developed digital back-propagation (DBP) algorithm can mitigate the fiber nonlinearities significantly. However, as a noise source, the transceiver noise will remarkably degrade the effectiveness of DBP algorithm. In this paper, we investigate the transmission penalty induced by the transceiver noise in Nyquist-spaced coherent optical transmission systems over different fiber types. We show that although the pure silica core fiber exhibits the best performance without transceiver noise, it is most sensitive to the transceiver noise.