Optical amplifiers based on longitudinal inhomogeneity photonic-crystal fibers

摘要

The invention relates to the field of optics, and more particularly to the art of optical fiber amplifiers. The optical fiber amplifier laser pulses comprising signal pulse input device, the optical fiber with a normal group velocity dispersion, doped with rare earth ions, a pump source, a multiplexer, through which a doped with rare earth ions, an optical fiber connected the pump source and input device signal pulse, output power pulse, characterized in that the rare-earth ions doped optical fiber is a photonic crystal, y ratio parameter which normal group velocity dispersion to the nonlinearity parameter increases exponentially along the length of the fiber. The use of photonic crystal fiber enables the gain in various wavelength ranges. A striking feature of doped photonic crystal fiber provides a reduced level of the amplified pulse frequency modulation. Consequently, the amplification is carried out more efficiently, since the achievement of the pulse spectrum limits spectral gain band occurs at higher values ​​of pulse energy.