Optical amplifying fiber and process of producing the same

Details Optical amplifying fiber and process of producing the same Optical amplifying fiber and process of producing the same

1997-06-03

1999-07-27

Ngo, Hung N.

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

372 6, 385142, G02B 622

Patent

active

059304367

ABSTRACT:
An optical amplifying fiber including a clad, a first core provided inside the clad and containing Ge, a second core provided inside the first core and containing Er and Al, and a third core provided inside the second core and containing Ge. The second core has a refractive index higher than that of the clad, and the first and third cores have refractive indexes each of which is higher than that of the second core. Since the third core having the high refractive index is provided at a central portion, it is possible to make smaller a mode field diameter and hence to improve a conversion efficiency of pumping light into signal light. Further, since the second core contains Al as an amplification band width increasing element, it is possible to sufficiently ensure a wide amplification band width.

REFERENCES:
patent: 4815079 (1989-03-01), Snitzer et al.
patent: 5278850 (1994-01-01), Ainslie et al.
patent: 5530710 (1996-06-01), Grubb
Patent Abstacts of Japan, vol. 015, No. 196, May 21, 1991 and JP 03 048225 A (Furukawa Electric Co. Ltd.), Mar. 1, 1991.
Patent Abstacts of Japan, vol. 017, No. 320, Jun. 17, 1993 and JP 05 034528 A (Fujikura Ltd.), Feb. 12, 1993.
Patent Abstracts of Japan, vol. 016, No. 313, Jul. 9, 1992 and JP 04 088306 A (Furukawa Electric Co. Ltd.), Mar. 23, 1992.
Patent Abstracts of Japan, vol. 012, No. 210, Jun. 16, 1988 and JP 63 008707 A (Fujikura Ltd), Jan. 14, 1988.

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