We present a numerical investigation of nonlinear propagation of femtosecond pulses in photonic crystal fibers (PCFs)
by solving the generalized nonlinear Schrodinger equation. The PCFs have a second-order dispersion of -48 ps2/km,
nonlinear coefficient of 115 W-1km-1, and third-order dispersion (TOD) ranging from 0.1 ps3/km to 1 ps3/km at 1550-nm
wavelength. The simulation results show that efficient spectral compression of ultrashort pulses can be induced in the
regime of soliton self-frequency shift (SSFS) in PCFs when the input pulse parameters satisfy the condition 0.9 ≤N ≤ 1.2
for the soliton order N. It is found that the output spectral width is dependent on the peak power of input pulse and the
PCF length. A spectral-compression factor up to 2.2 can be achieved for 50-fs, 1550-nm solitons propagating through
10-m PCF with a TOD of 0.5 ps3/km, where the soliton wavelength shifted from 1550 nm to 1698 nm. The effect of
initial pulse chirp on output spectral width can be negligible for large PCF length. Greater spectral-compression factor
can be obtained using PCF with larger TOD value. This SSFS-based spectral-compression scheme offers much promise
for generation of narrow line-width tunable light sources in photonic applications.
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