A novel hexagonal lattice photonic crystal fiber (PCF) design with two triangular arrays of semiminor-axis-decreasing elliptical air holes is proposed in this paper. The PCF characteristics based on the full-vector finite element method with perfect matched layer boundary conditions show that a wider bandwidth and dispersion-flattened profile for single-polarization single-mode (SPSM) operation is achieved. The SPSM operation can be realized in a spectral region ranging from the wavelength of 1.4 to 2 μm. The profile with convex and dispersion-flattened dispersion is obtained from the wavelength of 1.391 to 1.624 μm.
We propose a novel photonic crystal fiber (PCF) design for single-polarization single-mode (SPSM) operation. The
proposed SPSM-PCF characteristics are investigated by using a full-vector finite element method (FEM) with perfect matched layer
(PML) boundary conditions. The proposed SPSM-PCF performs SPSM operation for a wide range of wavelength. The results show
that this is a good design methodology to realize broadband SPSM operation.
The propagation characteristics of pico-second chirped soliton are numerically investigated in anomalous dispersion
dispersion-flatted fibers (DFF) with convex dispersion profile (CV-DFF) by use of the split-step Fourier method
(SSFM). It is found that higher-order dispersions (β3~β6) can be neglected during soliton propagation in the CV-DFF.
The fiber parameters D0 and k2 of the CV-DFF can be controlled according to the practical applications. The spectral
width, temporal full width of half maximum (FWHM), and the peak of temporal waveform oscillate with the propagation
distance. The period and amplitude of the oscillation increase with the increase of |C|.
Propagation characteristics of the femto-second chirped soliton pulse in dispersion-flatted fiber with linear dispersion
profile (DFF-LDP) are numerically investigated by using the split-step Fourier method (SSFM), and variations of its
characteristics affected by high-order dispersion (β2~β6), Raman effect, fiber loss and linear chirp parameter C are
studied. A new type of DFF-LDP with negative dispersion slope is presented. The pulse broadens with the increase of
propagation distance mainly because of fiber loss and third order dispersion (TOD). The effect of the positive chirp on
pulse broadening is greater than that of the negative chirp. The time-delay induced by TOD and Raman effect appears,
and decreases with increase of the chirp |C|. The main body of the pulse spectrum shifts to the long-wavelength region,
an obvious separated spectrum appears in the short-wavelength region. The separated spectrum for the chirped case is
more obvious than that for the unchirped case.
The supercontinuum (SC) spectrum generation is proposed in dispersion-flatted fibers with concave dispersion profile (DFF-CCDP). The effects of pulse characteristics and the fiber parameters on the SC spectrum characteristics are numerically investigated in the DFF-CCDP by using the split-step Fourier method. The characteristics of the SC spectrum become worse when the parameters are much smaller or greater. The parameters should be set according to the practical applications.
Effects of chirp and noises on autocorrelation characteristics of the linear chirped hyperbolic secant pulse are
numerically investigated. It is found that the intensity autocorrelation curve and the pulse waveform are unchanged with
the increase of the chirp parameter |C|. The spectral width and time-band product of autocorrelation spectral curve
increase with the increase of |C|. The autocorrelation curves broaden near the center of the curves and heighten at the
edges with the increase of the random noise, temporal window and sampling number. A method of filtering the random
noise is given which is useful for us to use the SHG-FROG analyzer or the instruments based on autocorrelation
technology.
We numerically investigate the autocorrelation characteristics of the linear chirped double-side exponential pulse and their variations affected by the chirp and noise, compare with the relevant parameters of the exponential pulse, give a useful method of filtering the random noise.
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