Abstract
We present experimental measurements illustrating the power-dependent coherence evolution for supercontinuum generated in highly nonlinear SF6 photonic crystal fibers. The measurements were performed for fiber lengths close to and much longer than the soliton fission length. Simulations of the spectral evolution were also carried out to accompany the experimental observation. Many parameters were estimated by matching the simulated and the measured evolution. Both the measured and the simulated coherence evolution confirm the association between coherence degradation and soliton fission.
Highlights
Supercontinuum (SC) generation in photonic crystal fibers (PCF) has been a widely studied field of great interest and wide applications [1]
We present experimental measurements illustrating the power-dependent coherence evolution for supercontinuum generated in highly nonlinear SF6 photonic crystal fibers
Many parameters were estimated by matching the simulated and the measured evolution. Both the measured and the simulated coherence evolution confirm the association between coherence degradation and soliton fission
Summary
Supercontinuum (SC) generation in photonic crystal fibers (PCF) has been a widely studied field of great interest and wide applications [1]. When the fiber length is shorter than the soliton fission length (Lfiss), SC is based nearly purely on self phase modulation (SPM), and soliton fission is avoided. This approach was previously used in SF6 to generate broad (350–3000 nm) spectrally smooth SC [5]. The spectral smoothness in this case was attributed to the stability of this SPM-dominated SC, not due to averaging in the measurement [6]. We present the results obtained from experimentally measured spectral evolution I(λ,P) and coherence evolution |g12(1)(λ,P)| (where λ is the wavelength and P is the average power of SC). The stability of spectral intensity is compared to the coherence in simulations
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