Abstract
Generation of very low-duty cycle high-quality optical pulse trains at repetition rate of tens of GHz around 1.5 μm has become increasingly interesting for many scientific applications such as optical sampling or ultrahigh capacity transmission systems based on Optical Time Division Multiplexing (OTDM). Unfortunately, the current bandwidth limitations of optoelectronic devices do not enable the direct generation of pulses with temporal width below a few ps and actively mode-locked fiber lasers were found to be an efficient, but onerous option to overcome this limitation. As an alternative issue to conventional mode-locking operation, we propose here a new, passive and cost-effective approach allowing the generation of picosecond optical pulse trains with very low duty-cycle (around 1/15) at a repetition rate of 20 GHz.
© 2007 IEEE
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