Abstract
A hybrid mode-locked Erbium-doped fiber laser that provides very short
pulse-widths while achieving high repetition rates is proposed and experimentally
demonstrated. This hybrid configuration is realized by using a thin film of
polydimethylsiloxane (PDMS) doped with single wall carbon nanotubes (SWCNT).
This PDMS/SWCNT composite acts as a saturable absorber and is inserted within
an active mode-locked laser system using angled connectors. Therefore, the
effect of the PDMS/SWCNT composite is to effectively narrow the width of the
pulses generated by the active system without modifying its repetition rate.
A pulse-width of 730 fs was generated at a repetition rate of 4 GHz, while
achieving an average output power of 4 mW. A reduction in the noise of the
photodetected RF spectrum was also observed in the hybrid system.
© 2011 IEEE
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