Optical fiber amplifier

Details Optical fiber amplifier Optical fiber amplifier

1994-07-29

1995-11-14

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

372 6, H01S 306

Patent

active

054672180

ABSTRACT:
An optical fiber amplifier employs an optical fiber and an optical coupler. The optical fiber has a core and a clad. The core has an erbium-aluminum-doped center and an erbium-doped annular section. The optical coupler guides signal light and pump light to the optical fiber, which amplifies the signal light using the pump light. The center of the core corresponds to a section where the field diameter of the signal light overlaps that of the pump light. The annular section is outside the field diameter of the pump light. The amplifier provides a required gain without employing optical parts such as filters. The signal light has a wavelength in the 1.5-micrometer band, and the pump light has a wavelength, in the 1.45-micrometer band, corresponding to the absorption band of erbium. The present invention may further employ pump light having a wavelength in the 0.98-micrometer band. The optical fiber may be doped with erbium and aluminum only in an annular section around the center of the core, to prevent a gain drop near a wave length of 0.98 micrometers.

REFERENCES:
patent: 5058976 (1991-10-01), DiGiovanni et al.
patent: 5140598 (1992-08-01), Tagawa et al.
patent: 5155621 (1992-10-01), Takeda et al.
patent: 5195149 (1993-03-01), Pfeiffer et al.
patent: 5218608 (1993-06-01), Aoki
patent: 5260816 (1993-11-01), Edagawa et al.
patent: 5291501 (1994-03-01), Hanna
patent: 5338607 (1994-08-01), Kawamoto et al.

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