We design a Raman Fiber Amplifier(RFA) pumped by 1435nm and 1470nm wavelength lasers. Heavy GeO 2 -doped optical fibers are adopted as gain media for the more symmetrical gain curve. The amplifier is designed to be distributed in two fibers to avoid intense power transferring between the two pump lasers when propagating in single fiber. Considering the spontaneous Raman scattering and the fiber loss, the numerical calculation is made to optimize the design of the RFA to get wide bandwidth and flat gain.
A new explanation of the intensity-dependent subpulse structure formation in linearly polarized picosecond laser pulses in a single-mode optical fiber is proposed based on the coupled-mode equations of the two linearly polarization components considering the intrinsic birefringent and nonlinear birefringent effects, and the numerical results show a good agreement with the experimental results.Keywords: single-mode optical fiber, picosecond optical pulse, subpulse Liu believed that the subpulse phenomenon was the result of the nonlinear polarization twisting induced by the intense pulses or so-called NIPT. In the model developed by Liu et al, they believed the fiber used in their experiment was nonbirefringent, so the linearly polarized laser pulses propagating in the optical fiber could be analyzed by the superposition of left-hand and right-hand circular polarization components. Because of the self phase modulation (SPM) and degenerate cross phase
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