Double-core light-conducting fiber, process for producing the sa

Details Double-core light-conducting fiber, process for producing the sa Double-core light-conducting fiber, process for producing the sa

1997-05-16

1999-01-26

Ngo, Hung N.

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

372 6, G02B 622

Patent

active

058646450

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

a) Field of the Invention
The invention is directed to a double-core light-conducting fiber, a process for the production of a double-core light-conducting fiber, a double-core fiber laser and a double-core fiber amplifier. The invention is applied, for example, in light-beam communication, laser technology, laser measurement technology, medical technology, and image display by means of laser radiation.
b) Description of the Related Art
A double-core fiber laser with a pump core which is round in cross section and in which a laser core is arranged in the center and is enclosed by cladding is already known from "Optics Letters", Vol. 20, No. 6, pages 578-580. This known double-core fiber laser has the disadvantage that only a portion of the pumping light is absorbed in the central laser core because of helix beams, as they are called, which are formed in the interior of the pump core and which do not intersect the laser core and are therefore not absorbed.
A double-core fiber laser with a round pump core and acentric laser core is known from U.S. Pat. No. 4,815,079. This double-core fiber laser is difficult to manufacture and the laser core tends to deform elliptically in cross section. The patent also discloses a double-core fiber laser with a pump core having a rectangular cross section and a centric laser core.. This double-core fiber laser is also complicated to manufacture. Pumping light losses occur at the edges of the pump core and the coupling in of pumping light from diode lasers is more difficult than with double-core fiber lasers having a round pump core because of the rectangular geometry. Further, fiber lasers with a rectangular cross section are not compatible with standard fiber components.


OBJECT AND SUMMARY OF THE INVENTION

The primary object of the present invention is to develop a novel double-core light-conducting fiber which can be produced more simply, has a higher efficiency in amplifier operation, and is compatible with fiber-optic production processes and standard components. Further indicated are a double-core fiber laser and a double-core fiber amplifier which can be produced more simply and enable a substantially complete absorption of the pumping light in the laser core and accordingly achieve a high optical efficiency.
This object is met by means of the invention in a double-core light-conducting fiber, by the invention in a process for the production of a double-core light-conducting fiber, by the invention in a double-core fiber laser, and by the invention in a double-core fiber amplifier.
The invention proposes a double-core light-conducting fiber with a round pump core having a centrically embedded laser core and at least one ground off portion on the outer side which extends in the longitudinal direction (direction of light propagation) of the double-core light-conducting fiber, resulting in a pump core with a D-shaped cross section. This ground portion causes an interruption in the symmetry of the pump core so that helix beams can no longer occur. Instead, the beam path in the pump core is chaotic so that the pump light which is coupled in is absorbed virtually completely in the laser core. The substantially round fiber with the centric laser core enables a simple connection with fiber-optic components and a simple coupling in of the pumping light.
In comparison to standard processes, the process for producing the double-core light-conducting fiber according to the invention requires only one process step which is relatively simple to accomplish. The grinding of the cylindrical surface of the preform can be carried out by means of conventional surface grinding machines which are used in the optics industry.
The double-core fiber laser which is constructed with the double-core light-conducting fiber according to the invention achieves a higher optical efficiency than conventional fiber lasers and requires a shorter fiber length for complete absorption of pumping light. As a result of the substantially round pump core, the coupling in of pump

REFERENCES:
patent: 4815079 (1989-03-01), Snitzer et al.
patent: 5373576 (1994-12-01), Minns et al.
patent: 5418880 (1995-05-01), Lewis et al.
patent: 5530710 (1996-06-01), Grubb

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