In this paper, a novel microstructure fiber (MSF) filled with E7 liquid crystal with polarization-maintaining and dispersion compensation characteristics is designed. The fiber is arranged and constructed in a conventional C6v structure, and the inner and outer cores are filled with liquid crystals. The rotation angle of liquid crystal molecules can be converted between 0° and 90° by using applied voltage, to realize dispersion compensation in two polarization directions. Under the external control, the effect of the effect of both polarization-maintaining and dispersion compensation can be achieved in the fiber, and the dispersion-compensation direction can be adjusted. It can not only broaden the research field of MSF and deepen the research depth of MSF polarization-maintaining characteristics and dispersion compensation characteristics, but also provide theoretical conditions for the continuous improvement of fiber communication technology.
Considering the low loss transmission and commercialization of hollow core fiber, negative curvature hollow core fiber (NC-HCF) has become a research hotspot in recent years. We report an innovative NC-HCF with an antiresonant layer inside the cladding tubes based on semi-ellipse and semi-circle structures. Based on the COMSOL simulation, it exhibits an ultralow loss from 0.6 to 1.6μm transmission band. On the one hand, as for semi-ellipse and semi-circle with antiresonant layer structure, the fiber lowest confinement loss (CL) of LP01 mode reaches a lowest value of 7.608 × 10 − 4 dB / km at 0.78 μm, and the high-order mode suppression ratio (HOMER) value can reach 4069. On the other hand, the semi-circle and semi-ellipse with antiresonant layer fiber structure shows the lowest CL of 1.675 × 10 − 4 dB / km at 0.79 μm, and the value of HOMER is 1776. Moreover, based on the fabrication tolerance analysis, the hollow core fibers proposed indicate better performance.
MFs with three zero-dispersion wavelengths are studied and designed by multi-pole method. Phase mismatch of this kind of MFs with d/Λ=0.40, Λ=1.8μm is studied when pump locates at all three zero-dispersion wavelengths and the wavelengths of some commonly used lasers. Numerical results show that broadband phase match can be achieved when the pump varies from the normal dispersion regime around the first zero-dispersion wavelength to the last zero-dispersion wavelength and two sets of phase matched wavelengths exist when the wavelengths of pump are in the anomalous dispersion regime between the first two zero-dispersion wavelengths. Then, a little air-hole is added in the fiber core and the dispersion characteristics of the new MFs are investigated for MFs with four zero-dispersion wavelengths. The phase matching topology of this kind of MFs with d/Λ=0.80, Λ=2.2μm, d0=0.636μm is analyzed when the pump is in the anomalous dispersion regime, zero-dispersion wavelength and normal dispersion regime of the fiber. Two sets of phase matched wavelengths can also be found when the MF is pumped in the anomalous dispersion regime between two neighboring zero-dispersion wavelengths. Interestingly, when the MF is pumped in the normal dispersion regime between the second and third zero-dispersion wavelength, three phase matched wavelengths sets appear. For MFs with multiple zero-dispersion wavelengths mentioned above, in entire phase matching band, there always exists one Stokes wave whose wavelength is longer than the longest zero-dispersion wavelength of the fiber, which will provide more possibilities for frequency conversion in mid-infrared band.
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