Photon-crystal chalcogenide fibre and method of its production
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.
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.
SUBSTANCE: optical probing signal is entered into each fibre of the optical line. Each specified signal which passed through the respective fibre of the line is consistently read out and an optical fibre in the line is identified on the basis of the received signal. The probing signal for each fibre of the line has a unique sequence of optical impulses which characterizes the number of optical fibre in the line.
EFFECT: automation of the process of identification of optical fibres, improvement of reliability of identification of the ends of optical fibres irrespective of their number, arrangement and colour marking.
2 cl, 2 dwg, 1 tbl
SUBSTANCE: dry, deuterium-containing gases, for example dimethylsulphoxide D6 vapours, are introduced into a tube of a fibrous light guide workpiece. Alloying of precipitable layers of a glass core and envelope with small additions of deuterium is carried out both in the process of the layer precipitation and at high-temperature tube compression.
EFFECT: reduction of the light guide optical loss and mass loss of workpieces, reduction of thereof production process duration.
2 cl, 1 tbl
FIELD: physics, optics.
SUBSTANCE: invention relates to single-mode optical fibres having a low attenuation coefficient. The optical waveguide fibre includes a core and a cladding. The core includes an alpha-profile, where alpha (α) is greater than 2.5 and less than 3.0. The core and cladding provide the fibre with an attenuation coefficient of less than 0.331 dB/km at wavelength of 1310 nm, attenuation coefficient of less than 0.328 dB/km at wavelength of 1383 nm, attenuation coefficient of less than 0.270 dB/km at wavelength of 1410 nm and attenuation coefficient of less than 0.190 dB/km at wavelength of 1550 nm. Also provided is a method of producing the optical fibre.
EFFECT: reduced attenuation coefficient and bending loss.
5 cl, 8 dwg, 5 tbl
SUBSTANCE: invention relates to lighting devices. In a light-emitting device a light source has narrow or limited distribution of light intensity. The device is designed so that light from a source is emitted with a wider spatial distribution of light intensity through a peripheral surface at the light emission section designed as a funnel.
EFFECT: light-emitting device in addition contains a mixing section for the light radiated from the source.
13 cl, 8 dwg
SUBSTANCE: invention is related to a lighting facility with waveguide. The device comprises a waveguide element with the first and second outer surfaces and waveguide boundary. LED-based radiation source with optional collimating optical element is intended for radiation entry to the waveguide element through waveguide boundary. The first outer surface comprises structures for output of radiation from the waveguide element through the second outer surface. The device comprises a cavity with reflector in order to reflect radiation in the cavity in sideway direction from the second outer surface.
EFFECT: development of compact-size and thin lighting facility, which may be suspended to the ceiling, ensuring lighting from the ceiling by means of lighting in upward direction and lighting of the specific are by means of lighting in downward direction.
15 cl, 27 dwg
SUBSTANCE: invention relates to a device for removal of a cover of an optic fibre. In device (11) for removal of the cover of the optic fibre for drawing of glass fibre (1a) from coating (1b) by cutting coating (1b) in part (31) for removal of the cover and movement of part (13) for retention of the optic fibre to the side from the main unit (12) of the device for removal of the cover in a heated state, part (31) for removal of the cover is provided with supporting element (43) of a heater, on which heater (42) is installed, supporting element (43) of the heater is arranged in a recessed receiving part formed in housing (12a), heat-insulating gap (55) is formed between recessed receiving part (51) and supporting element (43) of the heater, the side surface of supporting element (43) of the heater and the inner surface of side wall (51b) of recessed receiving part (51) come into contact with each other by means of side rib (61) made on supporting element (43) of the heater.
EFFECT: providing a possibility of removal of a coating without any water penetration and with lower traction force, which is required for removal of the coating.
4 cl, 15 dwg
SUBSTANCE: cartridge for an apparatus for welding optical fibres comprises a base in the form of a plate with a rectangular shape in plain view which is positioned on a working surface, on the front surface of said plate of which on the edges of the same oppositely lying sides there are upward protruding prism-shaped blocks with sockets for mounting rod electrodes which are inserted coaxially with pointed ends opposite each other over the central part of the plate between the blocks. The rod electrodes at the other ends have nodes for connecting to a power supply for arc welding. In the central part of the plate there is a working area with sockets in form of coaxial channels lying along an axis perpendicular to an axis which passes through the rod electrodes while crossing the latter in the arc welding area for positioning ends of the optical fibres to be welded in the arc welding area. The working area has two spaced-apart guides on which V-shaped channels are formed, which are laid in reciprocal grooves on the back side of the plate in the prism shape of the blocks with through-openings for inserting the rod electrodes, provided with units for movement thereof along said openings for adjusting the position of the pointed ends thereof relative to each other, passing through coaxial cavities. In each prism shape of the block there is a through-opening for holding a cup-shaped element with a fastening element for a rod electrode.
EFFECT: simple design, high efficiency and easy usage.
SUBSTANCE: fibre-optic guide is obtained by chemical deposition of quartz glass from a mixture of starting gaseous reagents. The optic guide has a core of undoped quartz glass with low content of chlorine in the glass of the core due to considerable excess of oxygen O2 relative to silicon tetrachloride SiCl4 during manufacture.
EFFECT: providing high radiation resistance of an optic guide in the near infrared range by suppressing radiation-induced light absorption.
32 cl, 7 dwg
SUBSTANCE: optical fibre includes the central area of the glass core with the maximum gain Δ1max of the index of refraction in percents. The first internal annular field surrounds a core and has the gain Δ2 of the index of refraction in percentage. The annular field with depression surrounds the internal annular field and has the gain Δ3. The third internal annular field surrounds the annular field with depression and has the gain Δ4 of the index of refraction in percentage. Meanwhile Δ1max>Δ4>Δ2>Δ3. The difference between Δ4 and Δ2 exceeds 0.01, and the volume |V3| of the profile amounts, at least, 60%Δ mcm2.
EFFECT: low flexural losses.
20 cl, 1 dwg
FIELD: physics, optics.
SUBSTANCE: invention relates to collimators which can be used to illuminate liquid crystal screens. The collimator is in the form of a wedge-like optical waveguide having a first end and a second end opposite to the first end. The first end is thinner than the second end. The collimator also has a visible surface passing at least in part between the first end and the second end, and a back surface opposite the visible surface. The visible surface has a first critical angle, and the back surface is configured to be reflective below the first critical angle. Furthermore, an end reflector, having a polyhedral (faceted) lens, is placed at the second end of the optical waveguide.
EFFECT: reduced overall dimensions of the collimator.
15 cl, 10 dwg
FIELD: radiation monitoring.
SUBSTANCE: detector has X-ray registration unit made in form of set of fiber-optic scintillators and fiber-optics communication transmitting unit (both made in form of single fiber-optic module, photoreceiver provided with signals electronic processing unit made in form of pixels optical system. Integral fiber-optic module is made in form of one-piece fibers on the base of argentums halogenides AgCl-AgBr-AgI. Registering part has active admixture and transmitting part has no active admixtures.
EFFECT: improved efficiency of registration.
FIELD: fiber-optic technology; laser processing of materials.
SUBSTANCE: optical fiber is substituted with target when adjusting. Target is positioned at plane of entrance edge of optical fiber. Mark is applied onto surface of target by means of single laser pulse passed through focusing unit. Observing unit is installed. Plane of target is observed through eye-piece and focusing unit. Center of mark at target is put in coincidence with center -f cross-point of eye-piece due to tilting of observing unit by means of adjusting aid. Target is removed and fiber optic is placed instead of it. Focusing unit is tightly connected with optical fiber.
EFFECT: simplified design; improved reliability, improved precision; widened range of laser radiation wavelength into optical fiber.
2 cl, 1 dwg
FIELD: shaping and processing radio signals.
SUBSTANCE: in order to enhance identity of copy generation while retaining ability of controlling input radio signal replication process, proposed device is provided with newly introduced (N -1) fiber-optic four-terminal networks, each of them incorporating Y-type internal adding and separating fiber-optic directional couplers.
EFFECT: reduced consumption of optical fiber.
1 cl, 27 dwg
FIELD: preparation of the optical fiber transducer as a sensitive element with preset characteristics, assembly of the transducer components, connection of the optical fiber ends respectively to a light source and to a photodetector.
SUBSTANCE: for bending the fiber to a preset angle and fastening of it on the first dielectric base of an optically transparent material the optical fiber is first laid on a flexible transparent dielectric base in the form of an arbitrary line with observance of the preset radius of curvature over the entire surface of the transducer base with the use of a stencil. Then the fiber is fixed on this base with the aid of polymer adhesive. The second dielectric base in the form of a polymeric laminated film is laid over the fixed fiber, after that the obtained assembly is connected in the conditions of thermocompression welding.
EFFECT: provided use of the transducer for reliable and precise registration of the fact and point of built-fragment injury of the object surface under control.
1 dwg, 1 tbl
FIELD: optical engineering.
SUBSTANCE: single-mode optical fiber has light-conducting part (4) of core, internal part (3) of envelope which surrounds part 4 of core and area of coating which surrounds the internal part (3) of envelope. Refractivity factor of core part 4 excesses refractivity factors of area 1 and 3 of envelope which are almost equal. Internal part (3) of envelope is made of SiO2 which includes doping fluoride in amount of 0,1-8,5 mass percent which results to compressing axial force of part 4 of core along its whole cross-section. Internal part 3 of envelope is additionally provided with doping additives to increase refraction and to get refractivity factor being practically equal to refractivity factor of area 1 of coating. Tube base is made of silicon dioxide and the base functions as area of coating. Internal part of envelope and area of core are formed by means of one or several reaction-capable gases. After they are formed the tube of base is subject to shrinkage and elongation to single-mode optical fiber. Single-mode optical fiber produced has low hydrogen-induced attenuation at 1500 nm wavelength.
EFFECT: lower hydrogen-induced attenuation.
15 cl, 8 dwg
FIELD: manufacture of optical materials and polymer compounds.
SUBSTANCE: proposed fluorated diene CF2=CF(CF2)nC(CF3)ROCF=CF2, where R is atom or fluorine or trifluoromethyl group and "n" is integer from 1 to 3 is produced by dehalogenation of various compounds. Specification gives description of polymer whose monomer is fluorated diene referred to above. Proposed optical transmitting device contained above-mentioned polymer and optical plastic fiber also containing above-mentioned polymer.
EFFECT: production of polymer suitable for optics and possessing high glass transition temperature.
10 cl, 21 ex
FIELD: optical engineering.
SUBSTANCE: dispersion-compensated fiber when being reeled upon small spool does not result to losses and it has stable temperature characteristic. For fibers with compensation of dispersion within wave range of 1,53 50 1,63 micrometers, bend losses with diameter of reeling of 20 mm are equal to 5dB/m and less. Chromatic dispersion equals to -120 ps/nmxkm, cut-off wavelength does not exceed 1,53 micrometers. External diameter of envelope equals to 80-100 micrometers, external diameter of coating equals to 160-200 micrometers. Adhesion property of surface of coating gum does not exceed 10gs/mm. Volumetric relation is reduced at least twice comparing to traditional module of dispersion-compensated fiber.
EFFECT: stable temperature characteristics; low losses; low dispersion of polarized mode in dispersion-compensated fiber.
29 cl, 13 dwg
FIELD: measuring technique.
SUBSTANCE: fiber-optic converter of movements comprises axially aligned nontransparent shield with opening and cords of input and output optical fibers. The distance between the input optical fibers and shield and the distance between the input and output optical fibers are determined from the equations presented. The receiving face of the cord of output fibers receives the section of fiber that is coaxial to the input optical fiber and opening in the shield. The receiving faces of the output optical fibers are arranged around the fiber section.
EFFECT: enhanced accuracy of measurements and simplified structure.
FIELD: laser engineering and fiber optics.
SUBSTANCE: proposed fiber optic conductor designed for intensifying radiation at wavelength ranging between 1000 and 1700 nm has oxide glass core and oxide glass shell. Core incorporates bismuth oxide as well as elements of group including silicon, germanium, phosphor, aluminum, and gallium. Fiber optic conductor affords luminescence in range of 1000 to 1700 nm when excited by beams with wavelengths ranging between 750 and 1200 nm, luminescence bandwidth being at half of height over 120 nm. Proposed method for manufacturing fiber optic conductor includes production of optical conductor blank and core. Oxygen and pair of chlorides of elements chosen from above-mentioned group are passed through quartz glass tube. The latter is compressed to produce blank in the form of solid bar. Pairs of bismuth chlorides are also passed through tube together with chlorides. Proposed fiber laser has fiber optic conductor, pumping source, device for beam entry in fiber optic conductor, resonator, and device for removing generated beam from resonator.
EFFECT: enhanced intensifying bandwidth and its efficiency, reduced concentration of unwanted impurities ensured by proposed method, enlarged laser tuning wavelength range.
20 cl, 6 dwg
FIELD: method for processing optical fiber.
SUBSTANCE: method includes placement of optical fiber inside processing chamber; injection of deuterium-containing gas into processing chamber; and at stage of deuterium processing - subjection of optical fiber to effect of deuterium-containing gas environment. At the stage of deuterium processing, concentration D of deuterium in processing chamber is computed during deuterium processing on basis of original value A of deuterium concentration in deuterium-containing gas inside the processing chamber, concentration B of oxygen in environment of processing chamber and concentration C of oxygen in deuterium-containing gas inside the processing chamber. Deuterium concentration in the processing chamber is regulated on basis of computed deuterium concentration D. in accordance to the invention, other gases may be used, such as hydrogen-containing gas and nitrogen-containing gas.
EFFECT: precise adjustment of deuterium concentration even in case when the gas, serving as carrier of deuterium-containing gas, is other that air, and percentage composition of the gas, serving as carrier, fluctuates.