Abstract
We have experimentally investigated low-repetition nanosecond pulses delivered from an erbiumdoped fiber (EDF) laser operating in ultra-large anomalous dispersion regime. The output pulses with rectangular profile and Gaussian spectrum almost keep invariable when they propagate through either normal-or anomalous-dispersion fibers. After nanosecond pulses are amplified via a two-stage EDF amplifier, they are broken up and exhibited as flatly broadened supercontinuum from 1520 to 1700 nm if amplified pulses are launched into a 10-km single-mode fiber, whereas the pulses retain the same duration with a broadband supercontinuum from 1200 to 1750 nm if they are input into a 100-m highly-nonlinear low-dispersion photonic-crystal fiber (PCF). The experimental observations demonstrate that the nanosecond pulses result from nonlinear polarization switching and can be regarded as dispersion-insensitive low-coherent pulses rather than compressible pulses.
Original language | English |
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Pages (from-to) | 1903-1908 |
Number of pages | 6 |
Journal | Laser Physics |
Volume | 21 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2011 |
Externally published | Yes |