Comparative analysis of stimulated Brillouin scattering at 2  µm in various infrared glass-based optical fibers

Abstract

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Nonlinearity measurement undergoing dispersion and loss

“…On the other hand, the value of γ measured at 1550 nm using our method for low-loss fibers [4] was scaled according to our numerical simulations (which were in line with Ref. [18]) and obtained γ = 0.68 ± 0.06 W −1 km −1 . Consequently, β 2 /γ = −110 ± 6 ps 2 km −1 , which is compatible with our direct measurement and validates our approach experimentally.…”

High efficiency of Brillouin scattering behavior in single-mode Ge–As–Se–Te fibers at 2 μm

“…( 6). [10,12,29] The BGS comprises three or four peaks, each corresponding to the contribution of R 0m acoustic mode. The GAST fiber with 3-µm-diameter core shows three peaks at the acoustic frequencies f B1 = 7.02 GHz, f B2 = 7.10 GHz, and f B3 = 7.23 GHz with the Brillouin gain coefficients g B1 = 3.808 × 10 −9 m/W, g B2 = 3.767 × 10 −9 m/W, and g B3 = 3.7 × 10 −9 m/W, respectively, as indicated in Fig.…”

“…[14] Deroh et al compared and analyzed the SBS characteristics of different infrared glass-based optical fibers at 2 µm. [10] Overall, the high γ of ChG is conducive to the SBS effect. However, the high-efficiency Brillouin properties of chalcogenide fibers other than As-S and As-Se-based fibers have not been reported in the 2-µm waveband because the tuning of core size, numerical aperture (NA), and the thirdorder nonlinear coefficient are limited by glass materials.…”

“…[9] This suitable parameter (g B /A eff ) can be used to directly characterize SBS efficiency and Brillouin threshold power in small core fiber. [10] Florea et al reported that the threshold power is 27 mW at 1.56 µm for a 10-m-long As 2 S 3 fiber. [11] Tow et al constructed a Brillouin fiber ring laser by using a 3-mlong Ge 10 As 22 Se 68 chalcogenide photonic crystal fiber (PCF) with a Brillouin frequency shift (BFS) of 7.25 GHz and a gain linewidth of 17 MHz (the g B is 3.3×10 −9 m/W).…”

Octave-spanning coherent supercontinuum generation in a step-index tellurite fiber and towards few-cycle pulse compression at 2 μm

“…Step-index fluoride fibers then appear as suitable candidates for the linear compression stage in the spectral range under study, since they exhibit excellent transparency, anomalous dispersion, and lower nonlinearity than other infrared-glass optical fibers [36]. Note that few-cycle pulse generation from mid-IR fiber lasers has been recently demonstrated by using a typical grating-fiber compressor [37][38], namely the nonlinear spectral broadening in a short length of step-index chalcogenide fiber and a double-pass diffraction grating pair [39].…”