Abstract
A CS2-filled Er-doped fiber, which can provide high nonlinearity and gain, low and flat all-normal dispersion profile, low loss and single-mode operation in the wavelength range of 1500-2500 nm, is proposed and analyzed by numerical simulation. When the 1900-nm 0.1-ps initial pulse with a peak power of 30 kW is injected into the active fiber, the generated supercontinuum (SC) spectrum has a double-hump structure in the 1550-nm window and covers about 800-nm wavelength range spanning from 1400 to 2200 nm at -20 dB level. Furthermore, the 1550-nm pulse can be obtained synchronously with the 1900-nm initial pulse when the amplified pulse with a temporal double-peak shape is passed through a band-pass filter with its center wavelength at 1550 nm.
Highlights
Supercontinuum generation (SCG) in the all-normal dispersion fiber can be useful for applications such as optical coherence tomography [1], nonlinear microscopy [2], biophotonic [3], and ultra-short pulse generation [4] due to its perfect coherent properties
It was demonstrated by numerical simulation that the SCG with an enhancement of pulse energy and spectral flatness can be obtained through an ytterbiumdoped high-nonlinearity normal-dispersion photonic crystal fibers (PCFs) [28]
The results indicate that for the pulses propagating inside the CS2-filled Er-doped fiber, an increase in the concentration of the rare-earth ions or pump powers can raise the pulse energy and peak power, but has a negligible influence on the spectral bandwidth, which is mainly dependent on the peak power and duration of the initial pulse, and nonlinear parameter and dispersion of the fiber
Summary
Supercontinuum generation (SCG) in the all-normal dispersion fiber can be useful for applications such as optical coherence tomography [1], nonlinear microscopy [2], biophotonic [3], and ultra-short pulse generation [4] due to its perfect coherent properties. The nonlinear parameter of the fiber can be enhanced further for the all-solid soft glass PCF [14]–[16], air-tellurite PCFs [17], tapered tellurite step-index optical fiber [18], As2Se3 chalcogenide glass triangular-core graded-index PCF [19] and hollow-core silica fibers filled with highly nonlinear liquids such as carbon disulfide (CS2) [20]–[25] and chloroform (CHCl3) [26] In the latter case, the SCG covering from 1064 to beyond 1700 nm with 70-W average output power was demonstrated experimentally using a nonlinear ytterbium-doped fiber amplifier with all-normal dispersion [27].
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