Numerical investigation of highly coherent mid-infrared supercontinuum generation in chalcogenide double-clad fiber

Polarization-maintaining chalcogenide all-solid hybrid microstructured optical fibers and their mid-infrared supercontinuum generation

“…Broadband supercontinuum generation from about 2 to 10 µm in the mid-infrared window were experimentally demonstrated by pumping the fibers at 5.3 µm. Compared to the polarization-preserving supercontinuum generation from 3.1 to 6.02 µm by a tapered chalcogenide photonic crystal fiber reported before in Ref [26], the SC spectral range in this work is much broader. The proposed chalcogenide PM-ASHMOFs in this work can be promising candidates to realize highly coherent and broadband SC generation for novel mid-infrared applications.…”

“…To improve the SC spectral bandwidth and maintain its high coherence, a near-zero and flattened all-normal chromatic dispersion profile over a wide wavelength range is crucial as reported in our previous works [26,27]. In 2020, we reported a flattened and all-normal chromatic dispersion profile of about 5 ps/km/nm in the wavelength range from 5.2 to 11.2 m and a broad SC spectrum extending from 2.2 to 10 m by using a chalcogenide ASHMOF which has a central As 2 Se 3 core surrounded symmetrically by six As 2 S 5 rods in an AsSe 2 cladding [27].…”

Design of W-Type Index Chalcogenide Fiber for Highly Coherent Mid-IR Supercontinuum Generation

“…The noise is included by adding to the input pulse one random phase photon per mode in the frequency domain. To calculate the degree of the first-order coherence, we apply the ensemble average to the results of 20 simulations of different random quantum noise of the input pulses to produce 190 Mid-IR SC pairs [7]. Firstly, we set the fiber length to 20cm and vary the peak pump power.…”

“…At this regime, the pulse spectrum is broadened through soliton effects [5,6] However, these solitons are very sensitive to laser noise and produce fluctuations in the phase and intensity of the spectrum from one pulse to the next that ultimately lead to poor spectral coherence. There are two important factors to overcome this limitation and achieve high coherence of Mid-IR SC generation [7] First, it is necessary to adjust the chromatic dispersion to a small absolute value in the Mid-IR region. Second, the required nonlinear effects are achieved by using a Submitted small effective mode diameter and by employing materials with a large third-order nonlinear refractive index (nNL).…”

Numerical investigation on W-type index chalcogenide fiber based MIR supercontinuum generation

“…High-power single-mode fiber-based supercontinuum (SC) sources with extremely wide wavelength coverage are a key enabling technology for various applications such as spectroscopy 1 and metrology 2 as well as defense applications 3 . To realize highly coherent Mid-Infrared (MIR) SC generation, there are two important factors 4 , a small absolute value of the chromatic dispersion in the MIR region and a small effective mode diameter to increase the nonlinearity.…”