The performance is evaluated for both 5 Gb/s and 10 Gb/s data rates over transmission distances up to 500 km. The impact of thermal noise on the system performance is analyzed by varying input power from −5dB m to 20dB m for both 25 km and 50 km amplifying section at 100 km fiber length. The effect of thermal noise level on the transmission quality with a variation of amplifying section length, number of amplifying sections and channel speed is discussed. Long-haul 16-channel dense-wavelength division multiplexing networks employing two different avalanche photodiode (APD) structures (Si and InGaAs) and positive-intrinsic-negative (PIN) photodetectors are simulated and compared under thermal noise effects for different fiber lengths.
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