The enhancement of adaptive abilities of nonlinear optical pulses to polarization mode dispersion (PMD) is obtained by modulating breath-depth of two polarization states of the pulses. The breath-depth modulation is realized based on the interaction among self-phase modulation, cross phase modulation, group velocity dispersion and degenerate four-wave mixing, which results in making two polarization states of the pulses into a tighter state when nonlinear pulses propagate in optical fibers with high birefringence. Numerical results show that the transmission stabilities of modulated breath-depth optical pulses are improved in conventional fibers with random birefringence. The pulse broadening trend of the modulated breath-depth pulses induced by PMD is effectively suppressed by our proposed method. The symmetric output pulse shape is also reshaped in conventional fibers.
We proposed a new approach to enhance supercontinuum (SC) spectrum generation in dispersion-decreasing optical fiber with a new dispersion profile. The approach is based on the change of the chromatic dispersion D(λ,z) as a concave function of wavelengths that has no zero-dispersion wavelengths over the whole or part of the fiber as D(λ,z) is positive. A flatter and broader spectrum can be produced in our scheme. The general criteria parameters are obtained for characterizing SC shapes in the optical fibers.
A new nonlinear optical loop mirror (NOLM) constructed from a dispersion decreasing fiber (DDF) and a general fiber is proposed. Numerical simulation shows that a ultra-short pulse with pedestal suppression and small chirp generated by the new optical loop mirror can steadily evolutes over a very long fiber. When the pulse takes the best quality factor, the bigger compression factor is gained and the shorter optical fiber is used comparing to the use of the nonlinear optical loop mirror constructed from dispersion decreasing fiber (DDF-NOLM).
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