The multi-order output of stimulated Brillouin scattering (SBS) and Rayleigh scattering (RS) in a Raman pumped dispersion compensation fiber (DCF) are experimentally studied. The characteristics and the evolution of the output spectra under different pump powers are shown and analyzed.
A novel design of widely tunable Ytterbium-doped double-clad fiber laser is realized in this paper. The tunable wavelength output can be achieved by using a polarizer and polarization controller into the Frabry-Perot Ytterbium doped double-clad fiber laser. Wide wavelength tunability (1054-1080nm) is achieved either by rotating the polarizer or by varying the fiber birefringence with an in-line polarization controller (PC).
The generation of SBS in discrete Raman gain must be considered along with the problem of limited gain per unit
pump power when developing a practical Raman amplifier. In this paper, we focus on discrete Raman amplifier with 15
km dispersion compensating fibers (DCFs). The gain saturation of both forward and backward pumping schemes have
been considered and compared.
As the pump power increased, the SBS threshold decreased and the reflected power increased dramatically. The 7th
SBS stokes have been observed when the pump power is 490mW. The experimental results clearly indicate that the SBS
effects produced a saturation of the Raman gain.
KEYWORDS: Raman spectroscopy, Amplifiers, Interference (communication), Backscatter, Single mode fibers, Fiber amplifiers, Signal attenuation, Signal detection, Signal to noise ratio, Lithium
Two configurations of distributed Raman amplifiers with dispersion compensation module are analyzed. On the basis of dispersion compensation, a lossless hybrid line is obtained. And amplifier characteristics such as gain and noise figure are compared between the two configurations. The results show that the SMF+DCF configuration is a good candidate at low pump conditions.
A novel double-grating design of widely tunable Ytterbium double-clad fiber (DCF) laser is demonstrated. By using an extermal cavity in double-grating configuration the laser wavelength is tunable over a range of 72 nm from 1037 to I I 09 nm. And a spectral line width of GHz over the whole tuning range is achieved. Measurements indicate the laser is linear polarized.
A new pump configuration of two steps of cascaded Raman fiber amplifier is demonstrated and is numerically simulated in the 80 km fiber span. In order to obtain lossless transmission and low noise figure, the pump power values are optimized.
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