Device for protecting fibre lines against destruction by laser radiation
A technology for laser radiation and protection of optical fibers, applied in the direction of cladding optical fibers, optical waveguide light guides, and coupling of optical waveguides, which can solve problems such as manufacturing complexity and fiber elongation
Inactive Publication Date: 2007-08-01
俄罗斯A.M.普洛科霍洛娃普通物理研究所光纤科学中心
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Problems solved by technology
[0019] Disadvantages of prior art devices also include their manufacturing complexity, the fiber needs to be heated and elongated precisely
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[0056] After initiation in the fiber, the optical discharge propagates towards the laser radiation (see Figure 1), and if there are no obstacles in its path, the discharge travels the entire distance through the fiber to the source of the radiation. After the passage of the optical discharge, the fiber loses its waveguide properties due to damage to the structure of the fiber core (see Figure 2).
[0057] Fig. 6 is a schematic diagram of a possible embodiment of a device according to the invention for protecting an optical fiber from damage by laser radiation. The device for protecting the optical fiber comprises: a segment of the optical fiber as shown in Figure 6, wherein 7 is the fiber core, 6 is the fiber cladding, and 8 is a dotted line representing the position of the mode field in the fiber, and the distance therebetween is equal to the laser radiation in the fiber The diameter (D) of the mode field. Numeral 10 designates a portion of the optical fiber having a reflect...
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Abstract
The invention relates to laser engineering and fibre optics. The inventive device for protecting fibre lines against the destruction thereof by laser radiation is embodied in the form of the section of a light-guide which comprises the cladding (6) and the core (7) thereof. The position (8) indicates dashed lines which show the position of the field of light-guide mode. The distance between said dashed lines is equal to the diameter (D) of the field of light-guide mode. The position (10) indicates the section of the light-guide having the reduced diameter of a reflecting cladding. Said device operates as follows: a pressure of 10<4> atm. is produced by a high temperature in the core (7) during the propagation of an optical discharge wave. The value of 10<4> is close to the destruction limit of the light-guide material and to the stop of the optical discharge wave. For this reason, the fibre lines are provided with at least one section of the light-guide which has a reduced thickness quartz cladding and undeformed core.
Description
technical field [0001] The present invention relates to laser engineering and fiber optics and has applications in optical communication systems, fiber laser equipment for processing materials, and in medicine and other fields where optical radiation of 1 watt or higher optical power is transmitted through optical fibers. Background technique [0002] Today, the rate of information transmission in optical communication systems is increasing dramatically. [0003] With wavelength division multiplexing (WDM), the increasing rate of transmission of information over optical fibers requires a large number of channels carried by a single optical fiber. The need to use optical amplifiers in optical communication lines is also growing. [0004] The increase in the number of channels transmitted through a single fiber, the use of optical amplifiers (erbium optical amplifiers and Raman fiber amplifiers with large output powers), and the input of optical amplifiers that send light int...
Claims
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IPC IPC(8): H04B10/12G02B6/00C03C13/04G02B6/02G02B6/38
CPCC03C13/046G02B6/02G02B6/3813G02B6/00H04B10/00
Inventor 叶夫根尼·米哈伊洛维奇·季阿诺夫伊戈尔·阿列克谢维奇·布费托夫阿尔乔姆·阿列克谢维奇·弗罗洛夫
Owner 俄罗斯A.M.普洛科霍洛娃普通物理研究所光纤科学中心