Research of All-optical Broadcast Doublet Signals Based on Semiconductor Fiber Ring Laser

A novel scheme for all-optical generate ultra-wideband (UWB) signals based on semiconductor fiber ring laser (SFRL) is proposed, in which three doublet signals can be generated simultaneously. A comprehensive broad-band dynamic model of this kind of all-optical UWB doublet signals is presented. With a numerical simulation, the effects of the bias current of the Semiconductor optical amplifier (SOA) in the SFRL, the relative delay of input signal light and lasing light in the SFRL, and the power of input signal light on the performance of the doublet signals are investigated. The results show that when the bias current of the SOA, the relative delay between the input signal light and the lasing light in the SFRL, the power of input signal light change, the waveform of output doublet signals are significantly affected, but the radio frequency (RF) spectra of doublet signals conform to requirements for the UWB signal. The optimized scope of the bias current of SOA, the relative delay between the input signal light and the lasing light in the SFRL, and the power of the input signal light are given by simulation in this paper.