Double-clad fibers with a doped single-mode core and a noncylindrical multimode chaotic cladding are shown to provide optimal pump-power absorption in power amplifiers. Based on the chaotic dynamics of rays in such fibers, we propose a quantitative theory for the pump-absorption ratio and favorably compare the predictions of the theory with numerical results obtained through an adapted beam-propagation scheme.
© 2001 Optical Society of America
(030.6140) Coherence and statistical optics : Speckle
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(080.2740) Geometric optics : Geometric optical design
(250.4480) Optoelectronics : Optical amplifiers
Valérie Doya, Olivier Legrand, and Fabrice Mortessagne, "Optimized absorption in a chaotic double-clad fiber amplifier," Opt. Lett. 26, 872-874 (2001)