A nonlinear optical loop mirror (NOLM) based on photonic crystal fiber (PCF) is used for optical pulse shaping. The
transmission of optical pulses in the fiber loop can be described by the nonlinear Schrödinger equations. The crossing
phase modulation (XPM) effect which happens between signal pulse and control pulse in NOLM is used for pulse
shaping. The theory of XPM effect in NOLM is analyzed theoretically and the process of pulse shaping is simulated. For
the input Super-Gaussian signal pulses, it can be found that the pulse can be shaped from flat to sharp by the
compression effect. For the input Hyperbolic-Secant signal pulses, it can be found that the pedestal from the compressed
pulse can be suppressed by the NOLM. Due to the characteristics of PCF, especially high nonlinear properties, the high
quality shaped pulses can be got. Compare with the self phase modulation (SPM) effect for optical pulse shaping, it is
shown that the input pulse with low power itself can be shaped and the shaping of the input pulse can be controlled by
the control pulse. Based on the analysis of the result, proper parameters and the crystal fiber of the NOLM will be
selected.
In this paper, a nonlinear optical loop mirror (NOLM) based on photonic crystal fiber (PCF) is used for optical pulse
compression. The transmission of optical pulses in the fiber loop can be described by the nonlinear Schrodinger
equations. The crossing phase modulation (XPM) effect in NOLM is used for pulse compression. The theory of XPM
effect in NOLM is analyzed and the process of pulse compression is simulated. Comparing three different shapes input
pulses, it can be found that the Hyperbolic-Secant Pulses have the better compression quality than the other two shapes
pulses. Due to the characteristics of PCF, especially high nonlinear properties, the high quality compressed pulses can be
got. Compare with the self phase modulation (SPM) effect for optical pulse compression, it is shown that the input pulse
with low power can be compressed and the compression of the input pulse can be controlled by the control pulse. By
choosing the proper parameters of the NOLM, to some extent, the pedestal of the compressed pulse can be suppressed.
Based on the analysis of the result, proper parameters and the crystal fiber of the NOLM will be selected.
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