Soliton trapping of dispersive waves in tapered optical fibers

Femtosecond Optics Group, Physics Department, Imperial College, London, UK.
Optics Letters (Impact Factor: 3.29). 02/2009; 34(2):115-7. DOI: 10.1364/OL.34.000115
Source: PubMed


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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    • "Markers correspond to various waves involved in the experiment of Fig. 4(a) and horizontal lines depict GVM wavelengths with the soliton. soliton deceleration [17], resulting in their inevitable collision. A part of the DW is transmitted through the soliton, and the remaining part of the DW is blocked and reflected onto it due to the strong nonlinear phase modulation from the soliton. "
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    ABSTRACT: We observe experimentally the spectral signature of the collision between a soliton and the dispersive wave initially emitted from the soliton itself. This collision, interpreted in terms of an optical event horizon, is controlled by the use of an axially varying fiber which allows us to shape both the soliton and dispersive wave trajectories so that they both collide at a precise location within the fiber. The interaction of the dispersive wave with the soliton generates a reflected wave with a conversion efficiency which can be controlled by the input pump power. These experimental results are confirmed by numerical solution of the generalized nonlinear Schrödinger equation and by the analytical calculation of the conversion efficiency.
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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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    ABSTRACT: In this paper, we drew a 500 m-long PCF taper directly on the industry drawing tower. The fiber taper has a uniform cross-section structure with OD from 170 μm to 70 μm, and demonstrates very good beam quality. The optical attenuation of PCF taper was measured. The optical attenuation is ~5 dB/km near 1200 nm, but the water absorption peak around 1400 nm and the attenuation beyond 1600 nm are still large. The zero dispersion wavelength (ZDW) was calculated to be ~1090 nm at the taper input end, and shifted to ~870 nm at the taper output end. The PCF taper was pumped with a picosecond laser source at wavelength of 1064 nm, and generated 200 mW output power of SC covering from ~450 nm to 1600 nm.
    Full-text · Article · Feb 2012 · Proceedings of SPIE - The International Society for Optical Engineering
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