Article

Soliton trapping of dispersive waves in tapered optical fibers

Femtosecond Optics Group, Physics Department, Imperial College, London, UK.
Optics Letters (Impact Factor: 3.18). 02/2009; 34(2):115-7. DOI: 10.1364/OL.34.000115
Source: PubMed

ABSTRACT We show that trapping of dispersive waves by solitons is significantly enhanced in tapered optical fibers as compared with nontapered fibers. For the trapping process to occur, the soliton must be decelerating; in nontapered fiber, the cause of soliton deceleration is Raman self-scattering to spectral regions of lower group velocity. It is shown here that deceleration of the soliton due to the changing group velocities in a tapered optical fiber also enables and enhances the trapping process, independently of Raman gain. This explains the enhanced blue spectral extension observed for supercontinuum generation in tapered optical fibers. This result also indicates that trapping of dispersive waves by solitons will also be possible in fibers or waveguides made from materials with negligible Raman self-scattering.

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    • "The short tapers can be easily fabricated on the taper rig by using the flame brushing technique, and are very suitable for ultra-short pump systems. Consequently, many works have been explored to generate the blue-enhance SCG with the short PCF tapers over the past years [10] [11] [12] [13] [14]. The trapping of dispersive waves by solitons is significantly enhanced in such short tapers as compared with constant core PCFs. "
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