Abstract

All-solid W-type index fluorotellurite fibers (AWFTFs) with near-zero-flattened dispersion profiles are designed for optical frequency comb (OFC) generation. The fiber core and cladding materials are ${{\rm TeO}_2} {\text - } {{\rm BaF}_2} {\text - } {{\rm Y}_2}{{\rm O}_3}$ (TBY) and fluoroaluminate glasses. Those two glasses have large refractive index contrast as well as similar thermal expansion coefficients and softening temperatures. The zero-dispersion wavelength of the TBY glass is about 2517 nm. By introducing fluoroaluminate glasses with relatively low refractive index as the cladding material and controlling the core diameter, the zero-dispersion wavelength of the fiber is shifted from 2517 nm to the wavelength region of 1500–1600 nm. Furthermore, two layers of thin annular glasses including a fluoroaluminate-glass-based inter-layer and a TBY-glass-based outer layer are added around the fiber core, which makes the fiber have a flat dispersion profile in the wavelength range of 1500–1600 nm. By optimizing the parameters (the core diameter, the thickness of the thin annular glass, etc.) of AWFTFs, the fiber with the chromatic dispersion value between $ - {0.2}$ and 0.35 ps/nm/km in the wavelength range of 1500–1600 nm is achieved. To investigate the application of the AWFTFs for OFC generation via cascaded four-wave mixing, we perform numerical simulations. The simulated results show that flat-top OFC spectrum expanding from 1450 to 1700 nm with tunable mode spacing from 25 to 100 GHz can be generated in 2 m long fiber by using a 1550 nm laser with a pulse width of 0.825 ps and a peak power of 60 W as the pump source.

© 2019 Optical Society of America

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