Optical fiber amplifying device and method therefor

Details Optical fiber amplifying device and method therefor Optical fiber amplifying device and method therefor

1996-12-13

1998-09-15

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359160, H01S 300

Patent

active

058087869

ABSTRACT:
First and second independent optical fiber amplifiers, which preferably include first and second rare-earth doped optical fibers, respectively, are provided in a two-stage series or parallel configuration. An optical divider for dividing and taking out pumping light to a side opposite where the pumping light is combined, is coupled to the first optical fiber. An optical combiner combines the divided pumping light with the second optical fiber from a side opposite to a pumping light source. The amplification efficiency is promoted by using the pumping light which has not been used in the one optical fiber amplifier by inputting it to the other, and vice versa. Preferably, wavelength filters block naturally emitting light to first and second optical combining and dividing instruments. Alternatively, wavelength filters block signal light in inputting the divided pumping light to the optical fiber amplifier on the other side.

REFERENCES:
patent: 5315674 (1994-05-01), Asako
patent: 5343320 (1994-08-01), Anderson
patent: 5497265 (1996-03-01), Fontana et al.
patent: 5506723 (1996-04-01), Junginger
patent: 5561552 (1996-10-01), Shibuya
patent: 5579153 (1996-11-01), Laming et al.
patent: 5581397 (1996-12-01), Maki et al.
patent: 5652675 (1997-07-01), Shibuya
European Search Report, dated Feb. 17, 1998.
M. Karasek, "Anaylsis of Gain Improvement of Pr3+-doped Fluoride Amplifiers Using an Optical Filter or Isolator", Optics Communications, vol. 107, Apr. 14, 1994, pp. 235-239.
Copy of Japanese Office Action with translation of pertient portions of the above-listed patent documents.

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