Abstract

Stimulated Raman scattering (SRS) is one of the most deleterious effect while propagating high-peak-power nanosecond-long pulses in an optical fiber. The main property of SRS is to shift part of the pump energy to lower frequencies (Stokes wave) at a rate which is proportional to the pump intensity times the Stokes intensity [1]. This effect can therefore be reduced by attenuation of the Stokes wave. Photonic-bandgap fibers (PBGF) are suitable for Raman-free propagation due to their intrinsic spectral filtering properties. The use of an all-solid PBGF for Raman filtering has been demonstrated in [2]. In this paper, we focus on the design of all-solid PBGFs for Raman-free propagation, and evaluate their performance by using an efficient spectrally-resolved model which has recently been developed [3].

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