Fitel USA Corporation

Vytran, LLC

Baishi Wang

Matthew Julius Andrejco

In some embodiments, an apparatus includes a first laser cavity including a set of high-reflector gratings coupled in series and a second laser cavity including a set of high-reflector gratings coupled in series. Each high-reflector grating has an associated spectral bandwidth. The first laser cavity is configured to receive at a first end optical energy having a first spectral bandwidth and the second laser cavity is configured to receive at a first end optical energy having a second spectral bandwidth. A fiber coupler is coupled to a second end of the first laser cavity and to a second end of the second laser cavity. The fiber coupler is configured to receive optical energy from the first laser cavity having a third spectral bandwidth greater than the first spectral bandwidth, and receive optical energy from the second laser cavity having a fourth spectral bandwidth greater than the second spectral bandwidth.

Passive coherent array using distributed fiber lasers

A rare-earth-doped optical fiber comprises a silica core region doped with a rare earth element and a cladding region adjacent the core region, characterized in that the core region is also doped with aluminum (Al) and fluorine (F). The presence of small amounts of F are effective to lower the refractive index, and hence the NA, of the core region even in the presence of significant amounts of Al (e.g., &#x3e;8 mol %). Thus, the fiber has both a relatively flat gain spectrum and a low NA (e.g., &#x3c;0.20). Also described are optical amplifiers that incorporate such fibers. Preferably the rare earth composition of the core includes at least erbium, and the core is also doped with germanium.

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Princeton, NJ, United States of America

Baishi Wang