Metallized fiber light guide and method of its manufacture

 

(57) Abstract:

The invention relates to optoelectronics and used in fiber-optic communication lines. Optic fiber includes a core, a light guide layer, located on the core and having a refractive index greater than the refractive index of the core, and a protective sheath, made in the form of a metallic film. The light guide layer is made in the form of alternating Svobodnyj zones that satisfy the condition S1= S2= . . . = SNwhere SN- the area of the N-th annular zone; N = 1, 2, . . . the zone serial number; SN= 0,5(0,5 M)0,5(rN1+rN2); the wavelength of the transmitted N-th annular zone radiation; M is the number of modes of radiation; rN1and rN2respectively the external and internal radii of the N-th annular zone. Between each annular zone is a layer with a certain refractive index, the thickness of each layer is equal to 2. The method involves the extraction of the fibre in a vacuum magnetron sputtering on the optical fiber protective sheath in the form of a metal film, heating the metal film to the temperature of its softening, cooling of the fibre and its winding on the coil. The hood and napyleniya. The increase of the power transmitted through the light radiation. 2 S. and 1 C. p. F.-ly, 4 Il.

The invention relates to optoelectronics, fiber optics and can be used for fiber optic communications, aviation, Astronautics and the national economy in the following areas: electronics, computing, medicine, engineering.

Known optical fiber sensors coated with a metal film applied with molten metal and deposition of vapor on the surface of the optical fiber [1] .

The disadvantage is the inability to use, for transmission of telecommunications signals.

Known fiber with step distribution of the refractive index with the same level of the value of the refractive index [2] .

The disadvantage is the high level of dispersion of the signal and low power of the signal being transmitted.

Known optical fiber and method of its manufacture, with the glass shell and the annular distribution of the refractive index with axial failure [3] .

The disadvantage is the inability to protect transmitted information from listening, a high level on the method of its manufacture with layer-by-layer coaxial distribution of refractive index in the form of tiered steps and with a Central isolated step, having different values of the refractive index [4] .

The disadvantage is the high level of dispersion and low power of the transmitted signal, the opportunity to listen to the transmitted information.

These analogues have considerable dispersion of the signal, do not protect information transmitted over the fiber, provide low power of the signal being transmitted.

The closest analogue to the invention is a fiber light guide [5] , containing core, which is transmitting layer, and the protective shell of the metal film, and the refractive index of the light guide layer is larger than the refractive index of the core.

Known technical solution [6] , describes a method for the production of metallized fiber of the fiber-based device for coating a metal-based optical fiber that allows you to apply a metallic coating by using a magnetron in a vacuum, and a method of applying a metallized coating on the fiber, the fiber [7] , based on the stretching of the fibre in vacuum and magnetron sputtering metal protective film on it, heating the metal which is the closest analogue to the proposed method.

The disadvantage of this method is the low density of the formed metallized coating.

These known solutions do not allow full use of all the section of optical fiber to transmit optical radiation, i.e. limit the power of the transmitted signal and have considerable dispersion of the signal due to the departure of optical radiation from one side of the light guide layer to another, when this occurs the phase shift due to the difference of the distribution of optical radiation as a consequence of the blurring signal and restrictions on the length of the fiber between the intermediate amplifiers.

These shortcomings deprived of the fiber light guide according to the invention with complete filling of the cross section of the light guide zones made by the method of manufacturing a metal coating based on magnetron sputtering with a hardening of the coating due to vortex spraying.

The technical result of the invention is to increase the optical power transmitted through the light, as well as reducing the dispersion of the transmitted pulse signal.

This result is achieved in that in an optical fiber containing the running of refraction of the core, and the protective sheath is made in the form of a metal film, the light guide layer is made in the form of alternating light guide zones that satisfy the condition:

S1= S2= . . . = SN,

where SN- the area of the N-th light guide area,

N = 1, 2, . . . - the zone serial number,

SN= 0,5(0,5)0.5(rN1+ rN2)

the wavelength of the transmitted N-th annular zone radiation

M is the number of modes of the radiation,

rN1, rN2respectively the outer and inner radius of the N-th annular zone, and between every two annular zones and between the core and the further annular zone is a layer with a refractive index of ncdetermined from the relation

nc= (nN2-rN22/(a2+rN22))0,5,

where a is the distance to the radiation source,

nNis the refractive index of the N-th annular zone,

the thickness of each layer is equal to 2 .

Annular zone may be of the Gaussian form of the distribution of refractive index.

The technical result of the proposed method is to provide high density metallized coating that provides improved operational parameter is placed metallized fiber-optic waveguides including stretching of the fiber in the vacuum of the workpiece, magnetron sputtering on the optical fiber protective sheath in the form of a metal film, heating the metal film to the temperature of its softening, cooling of the fibre and its winding on the coil, extractor fan and magnetron sputtering is carried out in a vacuum of < 10-3mm RT. Art. , and after drawing perform high-frequency plasma treatment of the fiber surface, and after magnetron sputtering of a metallic film perform its plasma polishing during heating, when the magnetron sputtering form a plasma vortex flow around the fibers.

In Fig. 1-4 there is shown a metallized fiber light guide and a device for implementing the method of manufacturing a metallized fiber-optic waveguides.

Metallized fiber light guide (Fig. 1, 1A) consists of a protective sheath in the form of a film of sprayed metal 1, the light guide layer composed of N light guide zones 2, 4 identical square layers 3, 5, width-2, with a refractive index of ncand core 6. The structure of the distribution of the refractive index shown in Fig. 1A.

Metallic fiber running track and the light guide area 4, limited layers with a refractive index of nc(3), is spreading fashion radiation 8, which output forms a ring structure 9 with a capacity of PN= P/N (Ref. 10 and 11 in Fig. 3), where P is the input radiation, the attenuation coefficient of the fibre.

The propagation of radiation in the optical fiber based on the ratio of the refractive indices of the medium of propagation of the radiation and the surrounding membranes. According to the solution of the characteristic equation, the condition of self-consistency of the light field gives the solution for the propagation of waveguide modes. The spread of the light guide modes can occur at the fixed ratio of the layer. In the metallized fiber analiziruetsya directional light guide fashion due to the spread between the reflecting surfaces formed by layers with ncwhere nc= (nN2-rN22/(a2+rN22))0,5when the high refractive index layer is surface spread of radiation, when the radiation incidence on the interface. The thickness of the layer is determined from the physical thickness determination of radiation penetration in the reflective medium - wavelength, the nutrient density at which nonlinear effects come, therefore, for uniform distribution of the radiation between the light guide zones selected condition equal squares. In this case, there is a uniform distribution of the incident radiation power between the light guide zones and simultaneous distribution of modes of radiation.

The area of each of the light guide area is defined from the relation

SN= 0,53,14(0.5 M)0,5(rN1+rN2)

where is the wavelength of the transmitted radiation of the N-th annular zone,

M is the number of modes of the radiation,

rN1, rN2respectively the external and internal radii of the N-th annular zone.

Thus, the area of the light guide zones are maintained equal, and the radiation propagation is stable.

The propagation is based on the law of total internal reflection. The intermediate layer is formed by doping the base material in the manufacture of the MSVD method and the value of its refractive index is determined on the basis of the ratios:

nc= (nN2-rN22/(a2+rN22))0,5,

where nNis the refractive index of the N-th circular layer

a - Rosslau made of material - IrTran-1 (1,3864). Can be fabricated by deposition of ions in the manufacture of blanks MSVD method (method external paraphase deposition).

Thus, the structure of the workpiece can be obtained by the manufacturing method MSVD.

If the form of distribution of the refractive index inside of the light guide area of the Gaussian coordination occurs between the intensity of the incident radiation and the refractive index, which improves the focus of the mod radiation inside the light guide area and reduce losses by reflection of radiation.

The method of manufacture may be implemented based on the setup shown in Fig. 4, placed in a vacuum furnace 12 for heating and drawing of the fibre that is implemented on the basis of the heat-treating furnace with a tungsten heating elements, RF plasma generator 14 for plasma cleaning, the magnetic field generator 15 to generate plasma vortex flow 16, the magnetron 17 for spraying metallized coating, the plasma generator 18 to 19 polishing and sealing metallized coating.

In the furnace 12 is heated billet to plastic state and is extruded fiber light guide 13, and the surface bytedata vortex plasma stream 16, generated by the magnetic field generator 15. Vortex plasma flow with great speed bombards the surface of the fiber and forms a protective sheath in the form of a sputtered metal film. The metal film has a loose structure, so it is then heated and fed to the polishing. After plasma polishing, produced by blowing a stream of plasma of the fibre, the structure of the protective sheath is sealed and is monolithic metal film with high adhesion to the surface of the fiber. Next, the fiber, the fiber is cooled and wound on the spool (Fig. 4 not shown).

As a result, the power of the transmitted radiation, compared with the prototype increases N times, so you can achieve on the diameters of optical fibers of 0.3 mm transmit power up to several hundred watts, compared to 50 watts normal fiber.

The variance of the signal decreases by more than 5 times compared with the standard value for single-mode optical fiber, which allows the use of longer communication and to increase the density of the transmitted information stream.

The need and relevance of the outputs of the light guide of animacii in various sectors of the national economy and development of the global information network.

Sources of information

1. WO 9114956, 03.10.1991.

2. EP 0798578, 01.10.1997.

3. US 4599098, 08.07.1986.

4. FR 2683638, 14.05.1993.

5. EN 2060520, 20.05.1996.

6. EN 2121464, 10.11.1998.

7. EN 97111705, 27.06.1999.

1. The fiber light guide, containing the core light guide layer, located on the core and having a refractive index greater than the refractive index of the core, and a protective sheath, made in the form of a metal film, wherein the light guide layer is made in the form of alternating light guide zones that satisfy the condition

SN1= SN2= . . . = SN,

where SN- the area of the N-th annular zone;

N= 1,2. . . - the zone serial number,

SN= 0,5(0,5 M)0,5(rN1+rN2)

the wavelength of the transmitted N-th annular zone radiation;

M is the number of modes of radiation;

rN1and rN2respectively the external and internal radii of the N-th annular zone, and between every two annular zones and between the core and the further annular zone is a layer with a refractive index of ncdetermined from the relation

nc= (nN2-rN22/(a2+rN22))0,5,

where is m, the thickness of each layer is equal to 2.

2. The fiber light guide under item 1, characterized in that the annular zones have the Gaussian form of the distribution of refractive index.

3. A method of manufacturing a metallized fiber-optic waveguides, including the extraction of the fibre in the vacuum of the workpiece, magnetron sputtering on the optical fiber protective sheath in the form of a metal film, heating the metal film to the temperature of its softening, cooling of the fibre and its winding on the coil, characterized in that the hood and the sputtering is carried out in a vacuum of <10 -3mm RT. century , after drawing perform high-frequency plasma cleaning of the surface of the fiber, after magnetron sputtering film perform its plasma polishing when heated, and when the magnetron sputtering form a plasma vortex flow around the fiber-optic waveguides.

 

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