Zero-dispersion-wavelength-decreasing tellurite microstructured fiber for wide and flattened supercontinuum generation

Abstract

We report wide and flattened supercontinuum generation in zero-dispersion-wavelength-decreasing tellurite microstructured fibers fabricated by using the tapering method. Flattened supercontinuum light expanding from 600to2800 nm can be generated when launching a 1550 nm femtosecond fiber laser into a 5-cm-long, zero-dispersion-decreasing, tellurite microstructured fiber. Our results show that short length (several centimeter) zero-dispersion-wavelength decreasing highly nonlinear fiber has a potential for generating wide and flattened supercontinuum light sources.

Multiple soliton self-frequency shift cancellations in a temporally tailored photonic crystal fiber

“…15 fibers are two orders of magnitude larger than those of silica fibers and promise a substantial decrease of the required pump power. 17 To measure the change of the refractive-index in temporal domain, we employed SSFSC, and its unlocking to monitor the change of GVD in temporal domain since the change of GVD is caused by the modification of the refractive-index. SSFSC is a phenomenon occurring in an optical fiber with a negative dispersion slope and a fixed GVD profile, in which the self-frequency shift of a soliton stops suddenly and a dispersive wave appears at its red side when the red-shifted soliton meets the fixed zero dispersion wavelength.…”

“…First, tellurite PCFs consisting of a hexagonal tellurite core with a diameter of $1.1 lm surrounded by six air holes were fabricated by using a rod-in-tube method. 17 The size of the air holes can be changed from 1.1 to 22 lm by controlling the fabrication conditions. Figure 3(a) shows the cross-section image of the PCF with six air holes of $11 lm.…”

“…The calculated nonlinear coefficient of the PCF is about 5700 km À1 W À1 at 1560 nm, which are two orders of magnitude larger than that of silica fibers. 17 Such a large nonlinear coefficient makes it possible to realize temporally tailored PCFs via optical Kerr effect. The corresponding GVD profile without pump light is shown in Fig.…”

Nonlinear frequency conversion in bismuth-doped tellurite suspended core fiber

“…However, because of the waveguide dispersion in fibers, the ZDW also depends strongly on the geometry of the waveguide. Shifting the ZDW down to 1680 nm, 1320 nm and 1030 nm was recently demonstrated in microstructured tellurite fibers with core diameters of 4.2, 2.1 and 1.2 μm respectively [17]. Also, a ZDW of 1390 nm was calculated in [8] for a bismuth-tellurite fiber with a 1.8-μm core size.…”

“…Based on the results in Refs. [8] and [17], we estimated the ZDW of our 2.9-μm core fiber to be in the range of 1450-1550 nm. In this suspended core fiber we investigated several of the most common nonlinear frequency conversion processes such as parametric generation (PG) and third-harmonic generation (THG).…”