Nonlinear soliton matching between optical fibers

Record power, ultra-broadband supercontinuum source based on highly GeO_2 doped silica fiber

“…We also tried the 56 mol % GeO 2 fiber in this configuration, but did not observe any spectral broadening for the 56 mol % fiber. We believe the lower non-linearity of this fiber and large core diameter leading to a mis-match of soliton order can be a potential cause of this observation [25]. Detailed investigations for this configuration are intended as a future work.…”

Thulium pumped mid-infrared 09–9μm supercontinuum generation in concatenated fluoride and chalcogenide glass fibers

“…The solitons are usually femtosecond long pulses having high peak powers, so when concatenating fibers the solitons from the first fiber can continue to redshift in the second fiber, which allows the spectral broadening to proceed, provided the effective soliton number of each individual soliton in the second fiber is larger than 0.5 [27]. In our case the second fiber is a highly nonlinear CHALC fiber and so the transferred solitons will have soliton numbers significantly above 1.5 and therefore undergo soliton fission, which leads to extended redshift and spectral broadening [27].…”

Nonlinear matching of Solitons - Continued redshift between silica and soft-glass fibers

“…When coupling fundamental solitons between two nonlinear fibers however, soliton number preservation becomes an equally important matching requirement, placing restrictions not only on the group velocity dispersion of the fibers (β 2 ), but also on their nonlinearity γ = n 2 ω/(cA ff ) [5,6]. Here n 2 is the nonlinear refractive index of the fiber material, ω is the frequency, c is the speed of light in vacuum and A eff is the effective area of the mode.…”

“…After propagation in 10 m of fiber 1, simulation of the GNLSE shows that the soliton has redshifted to approximately λ c = 1820 nm. We define the nonlinear coupling coefficient as [5],…”

“…(1) the power coupling efficiency 0 ≤ η ≤ 1, accounts for Fresnel reflection, mode field diameter mismatch and similar loss mechanisms. In the numerical treatment we take η = 1 [5]. In Fig.…”