We present a theoretical investigation of enhanced supercontinuum (SC) generation in a lead silicate photonic crystal fiber with the aid of tan-hyperbolic Gaussian pulses of peak power of 100 W, pulse duration of 50 fs, and pumped at a 1550-nm wavelength. It is observed that the generated spectra are asymmetric and composed of oscillatory structures. The span of the spectra increases, extending more toward the longer wavelength region with the increase of the tan-hyperbolic factor Ω0. The SC spectrum for Ω0 = 1.50 is found to be about 1.4 times wider than its Gaussian counterpart. This work may have potential applications in photonic and optoelectronic devices.
We present the design of a photonic crystal fiber which promises to yield very large optical nonlinearity ∼151 W−1 km−1 at 1.55 μm wavelength. The fiber possesses two zero dispersion points whose locations can be tuned by varying the air hole diameter and hole pitch. The fiber dispersion is anomalous between these two zero dispersion points and its value is moderate. The fiber has been used to numerically simulate optical supercontinuum (SC) generation using low power pump pulses of 50 fs duration at a 1.55-μm wavelength. At the end of 15-cm fiber, SC broadening of about 1200 and 1700 nm can be achieved with pulses of 1 and 5 kW peak power, respectively.
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