High coherent supercontinuum generation in nitrobenzene liquid-core photonic crystal fiber with elliptical air-hole inner ring

Abstract

A nitrobenzene liquid-core photonic crystal ber (NLC-PCF) is proposed in this work. The eight elliptical air-holes in the innermost ring of the cladding of the ber structure can contribute to exibly regulating dispersion and restraining the ber core. The appreciable dispersion is realized by adjusting the structural parameters of NLC-PCF, which is characterized by three zero-dispersion wavelengths (ZDWs), at dispersion with the uctuation of fewer than 40 ps•nm − 1 •km − 1 , and high nonlinearity as high as 5500 W − 1 •km − 1 . The propagation of femtosecond pulse and supercontinuum generation (SCG) in NLC-PCF is studied numerically when the pump wavelength is located in the normal and abnormal dispersion region near different ZDW through solving the generalized nonlinear Schrödinger equation (GNLSE) by the splitstep Fourier method. The numerical results show that a highly coherent supercontinuum (SC) spanning from 1.3 to 2.8 µm is obtained when the pump pulse with the center wavelength of 1910 nm, the peak power of 1000 W, and pulse width of 50 fs propagated in the 5 cm long NLC-PCF. This research can nd applications in the elds of novel liquid-core PCF design and ultrashort pulse propagation.

Design and analysis of the C6H6-filled circular photonic crystal fiber with ultra-flat dispersion for broadband supercontinuum generation with peak power of 130 W and 250 W

“…The ultra-flat dispersion is expected to increase the ability to broaden the SCG spectrum, achieving the desired bandwidth. This has also been verified in papers [9,18,44]. #F 3 possesses the flattest anomalous dispersion among the dispersion curves studied, values as low as 9.315 ps nm −1 • km at a pump wavelength of 1.75 µm (ZDW = 1.517 µm).…”

“…These fibers are expected to generate a broad, smooth SCG spectrum. With the air hole design in the innermost ring of the cladding having an elliptical shape and infiltrating C 6 H 5 NO 2 into the hollow core, the publication [44] achieved ultra-flat dispersion but the fluctuation is quite large (about 40 ps nm −1 • km). The work [18] also obtained ultra-flat dispersion with a fluctuation of 1 ps nm −1 • km over a 5.0 µm wide wavelength region using a PCF filled with C 2 H 5 OH.…”

“…So, after careful selection of the structural parameters of the PCF, it is possible to achieve the desired dispersion properties. Such structures may raise concerns in fiber production, but the rapid development of optical fiber technology can solve such problems [10,44].…”

“…So, after careful selection of the structural parameters of the PCF, it is possible to achieve the desired dispersion properties. Such structures may raise concerns in fiber production, but the rapid development of optical fiber technology can solve such problems[10,44].The structure of circular PCFs with C 6 H 6 infiltration is modeled using Lumerical Mode Solution software (LMS)[45]. Moreover, LMS also supports calculation of propagation coefficients as well as modes profiles related to the eigenvectors and eigenvalues.…”

Design and Optimization of C6H5NO2‐Core Photonic Crystal Fibers for Broadband Supercontinuum Generation with Low Peak Power

“…[19,20] Recently, liquid-filled hollow-core fibers have been proposed as an attractive approach for SC generation because liquids exhibit high nonlinearity and high transparency. [19,[21][22][23][24][25][26][27][28][29][30][31][32][33] Table 1 gives a brief summary of the results achieved with liquid core PCFs in recent years. Previously reported hollow-core PCFs showed excellent dispersion control and improved nonlinearity, as well as peak performance for generating wide SCs.…”