Photon-crystal chalcogenide fibre and method of its production

FIELD: physics.

SUBSTANCE: this fibre consists of a central waveguide rod of chalcogenide glass, microstructural waveguide shell of alternating plies of said glass and air gaps and second protective microstructural shell of multicomponent glass. Proposed method comprises pre-drawing of rods. Then, chalcogenide insert if formed by laying the rods of chalcogenide glass with appropriate air gaps. Then, outer support capillaries of multicomponent glass are fitted in thick-wall tube of multicomponent glass.

EFFECT: high nonlinearity.

5 cl, 2 dwg

 

The invention relates to optical and electronic industry and can be used for nonlinear conversion of electromagnetic radiation in the infrared (IR) range when designing systems for transmission and processing of information.

There are various types and designs of photonic crystal fibers, which are used in optical applications and, in particular, when solving problems related to the control of the spectral characteristics of the optical system and methods for their manufacture, for example, known chalcogenide fiber (US 6074968 A) having a glass core and two layers of the shell, the second shell layer has a refractive index lower than the core glass is higher than that of the first shell of glass. Glass fibers having the structure of the core and the cladding, have good mechanical performance and reduced losses of the transmitted signal in the infrared region of the spectrum. However, the main disadvantage of these fibers is a standard architecture, and the use of expensive chalcogenide glasses for the core and shell.

The closest solution to the proposed invention is the design of the fiber waveguides (US 2003044159 A1, US 7142756 B2) having along the axis of the waveguide: a cylindrical core extending along the axis of the waveguide, and about�Locke out of the tube, different from the core. This type of fiber is at least one of the parts is made of chalcogenide glass containing selenium and tellurium, and thus a high index contrast between the waveguide elements. The disadvantage of such waveguides is that the touch occurs volnovatsa strands of chalcogenide glass with regular glass, which increases the losses in the infrared region of the spectrum.

Known method of obtaining fiber (US 5953478 A), which is a method of hardening chalcogenide core that uses a metal coating, oxidation-resistant chemical components in the composition of the chalcogenide glass, wherein the coating has a melting point below the softening temperature of the chalcogenide glass. However, this method does not allow to produce a second tug to change the diameter of the fibers, with preservation coverage, as in the case of processing requires re-coating.

A method of producing a chalcogenide optical fiber (WO 2013166401 A1) by forming a preform consisting of a chalcogenide glass and polymer material, obtained by extrusion method. Moreover, in the extrusion process is heated to a temperature below the melting point of the chalcogenide glass, which leads to the formation�Oia polymeric shell, i.e. just the coating on the finished chalcogenide core. The proposed method does not allow changing the diameter chalcogenide cores, but only allows you to apply a polymer coating.

Closest to the invention by a method of producing a chalcogenide optical fiber is a method described in the patent (CN103011575 A). It shows the possibility of creating a chalcogenide photonic crystal fiber by the method of precision diamond drilling drill the billet chalcogenide glass. The main drawback of this technology is the inability to obtain holes with precision, achieved during the extraction of the workpiece, and the impossibility of varying the shape of holes and poor repeatability of products, not to mention the large losses of expensive glass.

The object of the present invention is the creation of a design and a method of manufacturing a photonic crystal chalcogenide fibers with a hard core, method of Assembly and constriction of the original blanks. In the design of the fiber, consisting of chalcogenide micro - and nano-structures, in contrast to known techniques, when used two types of chalcogenides with different coefficients of refractive index, the proposed solution has two advantages: first, it allows to produce fibers with diameter�rum core, close to the optical wavelength, which have high nonlinearity. Secondly, as the guide of defect used chalcogenide glass, and there is no need to use expensive glass to create a structural shell. Moreover, the creation of a second microstructural shell around chalcogenide insert will allow to protect her during the procedure fiber hoods. Thus, this solution will allow you to obtain cost-effective production of chalcogenide fiber.

Achieved the task that photonic crystal fiber has a Central guiding rod of chalcogenide glass waveguide microstructure of the shell of alternating layers of chalcogenide glass and air gaps and the second protective shell microstructural made of multicomponent glass. The manufacturing method includes a preliminary extraction of the rods of chalcogenide glasses in different sizes - the Central terminal chalcogenide has a size larger than the surrounding chalcogenide cores that perform the functions volnovatsa shell and support of the Central guiding rod, from thin-walled capillary tubes standard multicomponent glass and a thick-walled tube. Next, form a chalcogenide box by stacking rods from halage�LiDE glass in the center of larger diameter, in his image of a smaller diameter, with the respective air gaps, and then stack external supporting thin-walled capillaries of the multicomponent glass in a thick-walled tube from a multicomponent glass, and the inner diameter corresponds to the size of the installed package and then pull the workpiece into the fiber of the required size. The proposed design and technology will allow to develop a new type of chalcogenide fibers for flexible management of infrared radiation in nonlinear optical applications, in particular the generation of supercontinuum in the mid-infrared.

Due to the lack of transparency for the infrared range of the optical spectrum of the multi-component glasses of the group, the Central part of the waveguide fiber is from a chalcogenide glass, and due to the high cost chalcogenide glasses compared to the multicomponent glasses groups, covering the Central defect waveguide runs from the capillaries of the multi-component glass, selected based on proximity of the coefficients of thermal expansion and softening temperature and crystallization.

As starting material for the production of photonic crystal chalcogenide fibers with a solid core are round thin-walled capillaries of �mnogokomponentnogo glass and rods of different diameter from chalcogenide glass. Capillaries from multicomponent glasses are made from molten glass in a classic fibre technologies by drawing on the facility, consisting of a furnace, spunbond site and mechanism of extraction. In the furnace during heating (1000° C) softening of the glass, and the shape, size and subsequent product configuration forms die, spunbond node and the mechanism of the hood. And rods of different diameter from chalcogenide glass manufactured by pre-extraction of the required diameter.

After the stage of obtaining the blanks of capillaries and rods they are stacked in the package, for example, as at (Fig.1), implemented the required ratio between the core and sheath fibers. For effective localization of light in a solid waveguide defect basic defect (Central terminal chalcogenide) surround chalcogenide small studs, providing the necessary air gaps. If necessary, the hood is done in several stages. The main geometrical parameter of the structure, affecting the spectral characteristics of the fiber to the maximum extent is the diameter of waveguide defects in the fiber structure and the dimensions of the air gaps.

By assembling the billet of chalcogenide glass as a waveguide defect, � multicomponent glass group as the reinforcing fiber shell, get sufficient fiber transmission in the IR range of the spectrum of electromagnetic radiation, required localization of the radiation in the core for the implementation of the nonlinear conversion of radiation, and the cheapening of the fiber by reducing the mass of an expensive chalcogenide glass.

The invention is illustrated by the following examples.

Example 1.

Obtained after the constriction geometry of the fiber cross-section is schematically shown in Fig.2. The fiber structure includes: a Central core chalcogenide glass (1) with a diameter of 10 μm, which is suspended by four rods suspensions of chalcogenide glass (2) having a diameter of 5 µm, four capillary from multicomponent glass (3) relating to four of chalcogenide rod hangers (3), the tube from multicomponent glass (4) performs the function of a protective sheath and is needed to improve the strength characteristics of the fiber.

The invention is illustrated by the following drawings.

Figure 1 shows the geometry of the source beam photonic crystal chalcogenide fiber.

Figure 2 shows a photograph obtained by the proposed method fiber (cross section)

1. Photonic crystal fiber consisting of a Central guiding rod �W multicomponent glass, surrounded by microstructural membrane, in the form of periodically stacked array of capillaries from multicomponent glass, characterized in that the Central guiding rod made of a chalcogenide glass waveguide and microstructural shell is made of alternating layers of chalcogenide glass and air gaps.

2. Photonic crystal fiber according to claim 1, characterized in that it has a second protective shell microstructural made of multicomponent glass.

3. A method of manufacturing a photonic crystal chalcogenide fiber, including a preliminary extraction of the rods and capillaries, laying in the package and a second constriction, characterized in that the rods are made of chalcogenide glass, and capillaries - thin walled tubing standard multicomponent glass.

4. A method according to claim 1, which produces a preliminary extraction of the rods of chalcogenide glasses in different sizes, and the Central terminal chalcogenide has a size greater than the surrounding chalcogenide cores that perform the functions volnovatsa shell and support of the Central guiding rod.

5. A method according to claim 1, whereby the outer supporting thin-walled capillaries of electrovacuum glass placed around chalcogenide insert � thick-walled tube from a multicomponent glass, moreover, its inner diameter corresponds to the size of the installed package, and then pull the workpiece into the fiber of the required size.



 

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