This paper presents and demonstrates all-optical ultrawideband (UWB) Gaussian signals production method employing semiconductor optical amplifier (SOA) in a nonlinear loop mirror (NOLM). The scheme is constructed by manipulating the established cross phase modulation in the SOA-NOLM. The technique is also compliant with several signal modulation formats over all-optical processing system that permits to regulate the power, delay and polarity of the pulses. When a pulse propagates directly through the SOA-NOLM, each arm will experience phase delay and recombine to create UWB signal. This signal can be further widened by adjusting optical delay that governs the loop. Nevertheless, the SOA's injection current is not strongly influential in widening the pulse although the signals are amplified. This work focuses on the expansion of the pulse width of UWB signal by varying SOA's injection current and loop delay.
