Title :
Numerical Modeling of Intracavity Spectral Broadening of Raman Fiber Lasers
Author :
Hagen, J. ; Engelbrecht, R. ; Welzel, O. ; Siekiera, A. ; Schmauss, B.
Author_Institution :
Univ. of Erlangen Nuernberg, Erlangen
Abstract :
Raman fiber lasers (RFLs) are efficient light sources at frequencies where no other comparable all-solid-state sources are available. Especially if fiber Bragg gratings (FBGs) with narrow bandwidths are used, the bandwidth of the Stokes light is strongly broadened by Kerr nonlinearities like four-wave mixing (FWM), and self- and cross-phase modulation (SPM, XPM). In this letter, we discuss an exact numerical model to calculate the spectral behaviour of RFLs and show its application to determine the effective reflectivity of the FBGs. The model is based on a combination of the nonlinear Schroedinger equation including dispersion, FWM, SPM, and XPM with a shooting method to solve the power steady-state equations for RFLs. Numerical results are in good agreement with measurements.
Keywords :
Bragg gratings; Raman lasers; Schrodinger equation; fibre lasers; multiwave mixing; optical Kerr effect; optical modulation; phase modulation; spectral line broadening; Kerr nonlinearities; Raman fiber lasers; Stokes light; all-solid-state sources; cross-phase modulation; fiber Bragg gratings; four-wave mixing; intracavity spectral broadening; light sources; nonlinear Schroedinger equation; numerical modeling; self-phase modulation; Bandwidth; Bragg gratings; Fiber gratings; Fiber lasers; Frequency; Laser modes; Light sources; Nonlinear equations; Numerical models; Scanning probe microscopy; Four-wave mixing (FWM); Raman fiber laser (RFL); spectral broadening;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.905666
