Active optical fibers with wavelength-selective filtering...

Details Active optical fibers with wavelength-selective filtering... Active optical fibers with wavelength-selective filtering...

2006-11-20

2011-10-25

Bolda, Eric (Department: 3663)

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

C359S341100, C385S126000

Reexamination Certificate

active

08045259

ABSTRACT:
The invention relates to optical fibers for use in optical amplification of light, such as in optical fiber amplifiers and lasers and for use in delivery of high power light, in particular to a scheme for reducing amplified spontaneous emission at undesired wavelengths. The invention further relates to articles, methods and use. An object of the invention is achieved by a micro-structured optical fiber, which is adapted to guide light by the photonic bandgap effect and to have one or more pass bands and at least one stop-band over a wavelength range from λstop1to λstop2. In an aspect of the invention, the at least one stop-band provides filter functions that suppress nonlinear effects. In another aspect, the core region is actively doped, and the active material has an emission spectrum with a higher value of the emission cross section σEat a wavelength λASEbetween λstop1and λstop2than outside said wavelength range such that amplified spontaneous emission and lasing within the wavelength range from λstop1to λstop2is reduced. In still another aspect, the optical fiber exhibits photonic bandgaps at different wavelength ranges in different radial directions of a cross section of the optical fiber.

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