An all-optical tunable wavelength converter using a combination of self-phase modulation (SPM) effects in highly nonlinear microstructure fibers and narrowband spectral filtering is investigated, which is reported for the first time to our knowledge. Wavelength conversion over a±4nm bandwidth of a 10Gb/s date rate is obtained with good efficiency. A 25-m-long microstructure fiber with zero-dispersion wavelength at 800nm is used as the nonlinear medium. The core diameter of microstructure fiber is 2.4μm and the outer diameter is 125μm. The nonlinearity is γ=36km-1W-1, which is 20 times higher that that of a conversional dispersion-shifted fiber. The dispersion at the wavelength of 1550nm is ~+150ps/nm-km and the loss is 40dB/km.
A theoretical study of flat supercontinuum (SC) generation in a highly nonlinear photonic crystal fiber (PCF) is presented. We propose a chromatic dispersion profile of a highly nonlinear PCF for flatly broadened SC generation around 1550nm. The proposed chromatic dispersion profile of the fiber which is a convex function of wavelengths has small normal group-velocity dispersion at the pump wavelength and the dispersion slope around which is flat. It is found that the fiber with such dispersion characteristics is suitable for generating a relatively flat SC. The initial chirp of the input pulse also has a significant effect on SC generation in photonic crystal fiber. A flatter and wider spectrum can be obtained by the pulse with appropriate positive initial chirp.
A highly nonlinear photonic crystal fiber (PCF) is proposed to construct a nonlinear optical loop mirror (NOLM) for pulse compression and shaping. The proposed highly nonlinear PCF is a large air-filling fraction holey fiber with a small fiber core. The characteristics of the fiber have been studied. The NOLM made up of this PCF and an asymmetrical coupler for pulse compression and pedestal suppression is theoretically investigated. The results show that when compared with a soliton-effect compression in which only a piece of PCF is used, a NOLM based on a highly nonlinear PCF significantly suppresses pulse pedestals with a relatively short loop length. For a given input pulse, there exists an optimal loop length at which the high quality compressed pulse can be obtained. The proposed scheme can be used to compress long pulses by use of appropriate fiber lengths and works well for a broad range of input soliton orders.
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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