Fibre-optic lasers and amplifiers

Details Fibre-optic lasers and amplifiers Fibre-optic lasers and amplifiers

1989-03-20

1990-09-04

Gonzalez, Frank

Coherent light generators

Optical fiber laser

H15

Patent

active

049550250

ABSTRACT:
An active device (FIG. 1) comprising a length of doped fiber (1) and an end-coupled pump source (11). The fiber (1) is of single-mode geometry and incorporates rare-earth or transition metal dopant ions. These latter are incorporated at a low-level uniform concentration (.ltorsim.900 ppm). The fiber host (1) selected exhibits an inherently ultra low attentuation loss (.ltorsim.40 dB/km) at the emission wavelength. The fibers (1) are generally of long length (e.g. 5 m to 300 m) and may be coiled for compact packaging. The fiber (1) may be formed as part of a Fabry-Perot cavity (1, 7, 9); or, as a ring cavity (FIG. 8) using a doped fiber coupler (29) spliced to form a ring (27). Q-switch and mode-locking devices (19) and gratings (25) may be included as part of the Fabry-Perot cavity to allow pulse-mode operation and/or wavelength tuning, respectively. The fiber (1) may also be utilised as an amplifier.

REFERENCES:
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Stone et al., "Neodymium-Doped . . . Geometry", Appl. Phys. Lett., vol. 23, No. 7, Oct. 1, 1973, pp. 388-389.
Stone et al., "Neodymium-Doped . . . Pump", Applied Optics, vol. 13, No. 6, Jun. 1974, pp. 1256-1258.
Labudde et al., "Bandwidth Reduction . . . Raman Lasers", IEEE J. of Quan. Elec., vol. QE-16, No. 2, Feb. 1980, pp. 115-117.

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