Method for welding doubly clad optical fiber and photonic crystal fiber

A technology of photonic crystal fiber and double-clad fiber, which is applied in the coupling of optical waveguide, light guide, optics, etc., can solve the problems of high loss, high splicing loss value, mismatched outer diameter, etc., and achieve high-quality, low-loss splicing , low-cost effect

Inactive Publication Date: 2011-05-18
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

In the fusion splicing process of double-clad fiber and photonic crystal fiber, the main difficulties are: 1) the collapse of the air hole in the photonic crystal fiber leads to the destruction of its conduction mechanism and the introduction of high loss; 2) the mismatch of the mode field diameters of the two fibers The high loss introduced; 3) The outer diameter of the two optical fibers does not match, resulting in insufficient fusion strength or no fusion at all
These technical problems need to be overcome at the same time to achieve better results. For example, for two types of optical fibers with mismatched mode field diameters, even if the air hole of the photonic crystal fiber does not collapse, high losses can still be introduced due to the mismatched mode field diameters.
[0004] For the fusion splicing of two types of optical fibers with mismatched mode field diameters, the research team of the University of Bath in the UK proposed to connect the photonic crystal fiber and ordinary optical fiber when making the preform, and realize the mismatching mode field diameter when drawing the photonic crystal fiber. The connection between the photonic crystal fiber and ordinary optical fiber (see [S

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  • Method for welding doubly clad optical fiber and photonic crystal fiber
  • Method for welding doubly clad optical fiber and photonic crystal fiber
  • Method for welding doubly clad optical fiber and photonic crystal fiber

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[0029] Example

[0030] such as figure 1 The double-clad optical fiber shown is composed of a protective layer 1 , an outer cladding 2 , an inner cladding layer 3 and a fiber core 4 in order from the outside to the inside. The laser is transmitted in the core 4. The inner cladding 3 covered by the core 4 is made of silica with a refractive index smaller than that of the core 4. The inner cladding 3 is the transmission channel of the pump light, and its diameter is D. 1 ; The outer cladding 2 of the inner cladding layer 3 is composed of a polymer with a smaller refractive index. The mode field diameter of double-clad fibers is generally larger, and the outer diameter is also larger than that of ordinary fibers and photonic crystal fibers. the outer diameter D 1 (that is, the diameter of the inner cladding 3) is 250 μm, the core diameter is 30 μm, and the mode field diameter d 1 26 μm at 1064 nm wavelength.

[0031] such as figure 2 The shown photonic crystal fiber (PCF ...

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Abstract

The invention particularly discloses a method for welding a doubly clad optical fiber and a photonic crystal fiber. The method comprises the following steps of: reducing an outer diameter of the doubly clad optical fiber by a fused biconical taper method to ensure that the outer diameter of the doubly clad optical fiber is the same as that of the photonic crystal fiber; heating and collapsing air vent holes around the fiber core of the photonic crystal fiber to ensure that the module field diameter of the photonic crystal fiber is matched with that of the doubly clad optical fiber and keeping the outer diameter of the photonic crystal fiber basically unchanged; and welding the treated doubly clad optical fiber and the treated photonic crystal fiber by the conventional welding process. The method for welding the doubly clad optical fiber and the photonic crystal fiber has the advantages of low cost, high efficiency, high quality and simpleness and convenience.

Description

technical field [0001] The invention relates to an optical fiber fusion splicing method, in particular to a photonic crystal optical fiber fusion splicing method. Background technique [0002] Photonic crystal fiber, also known as microstructure fiber or holey fiber, has attracted much attention in recent years due to its novel optical properties. This type of fiber has broad application prospects in the fields of communication transmission, new optoelectronic devices, measurement and sensing, etc. Moreover, photonic crystal fibers have unique advantages in the field of nonlinear effects. By coupling pulsed light into photonic crystal fibers, it has become a research hotspot to study nonlinear effects and supercontinuum generation. [0003] In the field of fiber lasers, since most of the existing fiber lasers use the cladding pumping technology of double-clad fibers, the laser light of general fiber lasers is output from double-clad fibers. The double-clad fiber has the ch...

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Application Information

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IPC IPC(8): G02B6/255G02B6/245
Inventor 陈子伦侯静奚小明孙桂林陈胜平王泽锋司磊许晓军
Owner NAT UNIV OF DEFENSE TECH
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