Patent Number: 8,089,688

Title: Broadband neodymium-ytterbium-silica doped amplified spontaneous emission optical fiber source by spectral filtered reinjected signals

Abstract: The present invention provides an amplified spontaneous emission fiber optic source having high optical power (>20 mW) and a spectral broadband emission (>70 nm) centered near a wavelength of 1060 nm. In an embodiment of the invention, the fiber source comprises a combination of Yb-doped and Nd-doped silica fibers in a dual-pumping configuration. The Yb-doped optical fiber has a peak absorption coefficient of 350 dB/nm at 977 nm band, and the Nd-doped fiber used has a dopant concentration of 500 ppm-wt in a glass host of aluminum-germano-phospho-silicate. A combination of these two doped-fibers along with optical spectral filtering provides a broadband spectrum giving coherence length <7 .mu.m (in air), which is well suited for optical coherence imaging.

Inventors: Lobo Ribeiro; Antonio B. (Maia, PT), Trifanov; Irina (Maia, PT), Ramos De Melo; Miguel Alexandre (Gondomar, PT), Berendt; Martin Ole ( rvore, PT), Salcedo; Jose Antonio Ribera (Oporto, PT), Muniz; Rosa M. (Oporto, PT)

Assignee: Multiwave Photonics SA

International Classification: H01S 3/23 (20060101); H01S 3/067 (20060101)

Expiration Date: 2020-01-03 0:00:00