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We investigate basic nonlinear effects in optical fibers which opto-geometrical parameters oscillate along the propagation axis. These “topographic” fibers provide an additional degree of freedom leading to multiple quasi-phase matched modulation instability side lobes in single pass configuration or in passive cavities. Experimental results are confirmed by analytical and numerical ones.
We demonstrate a Yb:fiber ring laser incorporating a piece of solid-core photonic bandgap fiber for intra-cavity group delay dispersion compensation. The output pulse was as short as 29 fs after a prism pair compression with a spectral bandwidth of 41 nm. The output power was 150 mW at a repetition rate of 130 MHz.
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