Numerical Analysis of Modal Instability Onset in Fiber Amplifiers

Numerical Analysis of Modal Instability Onset in Fiber Amplifiers

Numerical analysis of the onset of modal instability in fiber amplifiers is presented. Specifically calculations of the evolution of the intensity fluctuation spectrum along the fiber for a sampling point offset from the core center are presented for different instability onset conditions. These inc...

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Bibliographische Detailangaben
1. Verfasser: Ward, Benjamin G
Format: Report
Sprache:eng
Schlagworte:
AMPLIFIERS
FIBER AMPLIFIERS
FIBER LASERS
FIBERS
INSTABILITY
LASERS
Lasers and Masers
MODAL INSTABILITY
NON-LINEAR EFFECTS
POWER SCALING
RAYLEIGH SCATTERING
STIMULATED THERMAL RAYLEIGH SCATTERING
THERMAL EFFECTS
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Zusammenfassung:Numerical analysis of the onset of modal instability in fiber amplifiers is presented. Specifically calculations of the evolution of the intensity fluctuation spectrum along the fiber for a sampling point offset from the core center are presented for different instability onset conditions. These include seeding with LP01 only, seeding with LP01 and LP11 at the same frequency, seeding with LP01 and LP11 at offset frequencies, and seeding taking quantum shot noise into account. The position dependent spectra are shown to be very similar for each of these cases suggesting a common instability mechanism. SPIE Photonics West 2014, Mar 2014. Published in Proc. of SPIE Vol. 8961, 2014. The original document contains color images.