Two-pump fiber optical parametric amplifiers with three-section fibers allocation

Based on the theory model of two-pump fiber optical parametric amplifier with single-section fiber allocation (FOPA-SF), a new two-pump fiber optical parametric amplifier with three-section fibers arrangement (FOPA-TFs) is put forward, which can provide gain bandwidth of more than 405 nm with optimum fiber parameters calculated by genetic algorithm. The numerical simulation is performed to investigate the influence of pump wavelength allocation on the gain spectrum of FOPA, and it is found that the smaller wavelength separation between the two pumps (Δλ) can provide more uniform gain over a relatively wide bandwidth. Moreover, the gain ripple owing to random fluctuations of zero-dispersion wavelength (ZDW) can be improved to a large extent by reducing pump separation Δλ.