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.
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
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.
We give the expression of the input experimental pulse, numerically study formation and propagation of chirped soliton
according to the nonlinear propagation theory by use of the split-step Fourier method. The numerical results are
consistent with the experimental data. The pulse can evolve into chirped soliton after propagating over 3.5 dispersion
length, the temporal FWHM and chirp gradually decreases with increase of input power. The temporal FWHM of
chirped soliton executes a kind of damped oscillation with increase of propagation distance whose period and amplitude
decrease with increase of input power, the temporal waveform always maintain near hyperbolic secant pulse during
Adiabatic transmission over 42.211 km of 10GHz, 1.5ps, ultra-short solitons in G652 standard fiber have successfully be demonstrated. The results show that optical pulses with input power of fundamental soliton can adiabatically transmit over more than one thousand of dispersion length, keep their shape unchanged, and the dispersion wave does not yet appear That is good agreement with theory of adiabatic soliton transmission,. When power of input pulses is less than fundamental soliton power, they can evolves into soliton and adiabatically transmit. Temporal width of the output soliton pulses is obviously more than that at soliton power input, but the spectral with of the output soliton pulses is very close to that at soliton power input. When power of input pulses is more than fundamental soliton power, temporal width of the output pulses is slight less than that at soliton power input, but the spectral with of the output pulses is obviously more than that at soliton power input.