We present what is, to the best of our knowledge, the first systematic study on how negative core-cladding index difference influences microstructured optical fiber's modal behavior. Single-mode lasing has been realized for short-length cladding-pumped phosphate glass microstructured fibers with large depressed-index Er3+-Yb3+-codoped cores.
© 2005 Optical Society of America
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2400) Fiber optics and optical communications : Fiber properties
(140.3510) Lasers and laser optics : Lasers, fiber
Fiber Optics and Optical Communications
L. Li, A. Schülzgen, V. L. Temyanko, H. Li, S. Sabet, M. M. Morrell, A. Mafi, J. V. Moloney, and N. Peyghambarian, "Investigation of modal properties of microstructured optical fibers with large depressed-index cores," Opt. Lett. 30, 3275-3277 (2005)