Optical fibers provided with lens by way of photopolymerization and optical components

FIELD: the invention refers to the mode of manufacturing lens in the shape of peaks on the end-faces of single-mode and multi-mode optical fibers.

SUBSTANCE: the manufacturing mode is in plotting drops of polymerized substance on the end-face plane of the fiber, radiation of the plotted drop with a source of light for realization light photo polymerization. At that before exposure they choose one or several desired modes subjecting the optical fiber to mechanical strains, at the stages of plotting the drop and radiation they execute control and management of the form and the sizes of the peak, before the radiation stage they hold out the mixture at the given temperature for achieving viscosity of the mixture which allows to get the needed height of the drop, regulate duration of exposure and/or intensity of the light for regulating the end radius of the curvature of the peak.

EFFECT: provides possibility to get peaks of different heights and different radiuses on the end-face planes of the optical fibers and also provides possibility to control the indicated parameters of the peaks in time of their manufacturing.

26 cl, 13 dwg

 

The technical field

The present invention relates to optical fibers with lenses, the first implementations and applications which was the object of the earlier patent application 9814385 "New optical fibers with lenses and high end digital disclosure".

Prior art

Known optical fibers with lenses and equipped at their ends transparent polymeric raised areas that allow for improved optical coupling between optical fibers or between the optical fiber and the active or passive components, the connection between which is carried out by using such fibers. You can create complex optoelectronic devices with high performance.

However, optical characteristics, the achievement of which tend developers are more and more wonderful, while practical applications require the development of new technologies in various fields of optics.

Summary of the invention

The technical task of the invention is the creation of new technological processes to ensure the realization of the polymer peaks representing the whole optimizare the data characteristics as single-mode, and multimode optical fibers and, accordingly, the development of new completely original devices (optical components), which require the users.

Brief description of drawings

The invention will be better understood from the following description of a preferred implementation options with reference to the accompanying drawings.

Description of the preferred embodiment variants of the invention

Figure 1 presents a schematic view of the end face of the optical fiber 4 containing the core 1 and sheath 2 and is equipped with polymer peak 3, implemented by means of some amenable photopolymerization polymer material, such as resin, and the dimensional parameters and the geometrical characteristics of this peak can be adjusted, for example, by optimizing new physico-chemical parameters depending on the function of the particular optical fiber.

In accordance with the first object of the present invention proposed an efficient method for the formation of the mentioned peaks, allowing for considerable variation in the height (in the range from several microns to several hundred microns) and the radius of curvature drops of polymer material deposited on the initial stage of the way. Dimensional parameters mentioned peak, which directly is directly dependent on the dimensional parameters of drops used polymer material, can be adjusted with high precision depending on the characteristics desired application.

The first operation for forming peaks (figure 2) consists of applying droplets (figure 2,a) a polymeric material with a pipette 5 at the end of the cut optical fiber 4, which instantly forms (figure 2,b) meniscus of the capillary 6, for which the height and the radius of curvature drops polymeric material directly related to the diameter of the optical fiber and the surface tension (capillarity). These values depend mainly on the viscosity of the used polymer material. To solve the task parameter viscosity is of paramount importance. In accordance with the invention the chemical composition of the used polymer material adapted thus to obtain the desired viscosity, but it plays an important role in the temperature of the material.

To reduce the height marked on the end face of the optical fiber drop polymeric material slightly heated, which reduces the viscosity of the material. Conversely, use pre-cooling of the material to make it more viscous and get more considerable height applied to the end face of the optical fiber drops. It should be noted that the temperature of the resin used as the poly the cluster material, which is in the range from 10 to 65°With, lets get the drops, the height of which is from 10 to 50 microns.

In the patent granted to inventors in the first invention, it was determined that at photopolymerization polymer material, forming a peak at the end of the optical fiber is a liquid material, sensitive to light green region of the spectrum, and formed by photoinitiators (eosin + MDBA) and the monomer (PETIA).

In accordance with the invention photoinitiator can be modified so that the applied polymer material was sensitive to longer electromagnetic waves than electromagnetic waves corresponding to the green region of the spectrum that is sensitive to radiation in the red region of the spectrum, close to the infrared radiation or, more specifically, close to the wavelengths commonly used in the telecommunications field, i.e. for wavelengths in the range from 1.3 to 1.55 mm.

In accordance with another aspect of the first technical task of the present invention, the surface tension directly related to the viscosity of the used polymer material can also be modified by pre-treatment optical fiber before applying drops of the material. Preliminary clicks the processing consists in soaking cleaved optical fiber in sulfochromic acid within 24 hours. While the optical fiber surface becomes hydrophilic and the effects of capillarity attenuated, reducing the height of the drop, which is about 10 microns.

The final width of the generated peak depends on the core diameter of the optical fiber, which in almost all its thicker conducts light, usually green, to the end of the fiber, to which was applied a drop of polymer material.

Conditions of exposure if exposure to light, in particular the value of providing for the polymerization of light intensity and time of this exposition, it is also very important and can be adjusted if necessary.

The final radius of curvature generated peak is much less than the radius of curvature of the initial drop is an important parameter to obtain the desired lens characteristics peak. The radius of curvature can be adjusted as a function of duration of exposure, which is in the range from 0.5 to 90 seconds, and the intensity photopolymerizing light supplied to the fiber, from 1 to 100 μw.

The radius of curvature of the peak also depends on the influence of oxygen on the surface of contact of a drop of polymer material with the ambient air. In accordance with the invention the oxygen effect is controlled by adjusting the composition of the air in the region of formation of the peak. You can apply nitrogen in a sealed chamber of the casing type with gloves, in which is placed the end of the processed optical fiber.

In accordance with the first object of the present invention process and the various parameters generated peaks were not only optimized to control the formation of the various peaks and their characteristics depending on numerous and diverse applications, but in order to develop a relatively simple and cheap method of implementation, allowing "mass production" peaks at the ends of multiple optical fibers.

In accordance with one aspect of the first object of the present invention, the laser radiation required for photopolymerization, distributed after the expansion and homogenization of the light beam by means of known optical methods on a large number of optical fibers for forming the gable peak.

Since the optical power required for photopolymerization is several milliwatts on each peak, in accordance with the proposed invention, it is possible simultaneously "mass production" of more than 100 peaks.

In accordance with the second object of the present invention (Fig 3) apply mainly already known technologies and processes, what about the improved multimode and single-mode optical fibers for the implementation of fiber optic components, outstanding or focused (figa)or collimated (fig.3b) beam of light.

In the case of multimode optical fiber incident light, initiating the polymerization process, comes from some external source to a multimode optical fiber that is associated with the optical components enhance the shape of the beam of light.

Photopolymerization is carried out without longitudinal distribution polymersomes light in the multimode optical fiber. This ensures that the exception lighting used polymeric material is a combination of various transverse modes propagating in the multimode optical fibers in the case, when providing the photopolymerization light is introduced into the end of such fibers. In this case, the geometry of the formed microlens close to the geometry of the droplets used in this case, a polymeric material, which was applied previously.

In accordance with another aspect of the present invention and in the case when in some embodiments, it is required that the geometry of the generated peak is not dependent on the intensity distribution of the different modes of this optical fiber, it is possible to make the polymer peak, attaching to the other end of the optical fiber source of white light, outstanding incoherent light is selected so to the range of wavelengths of emitted light was compatible with the various modes that can propagate in the optical fiber. In the case of applications that require the use of compact units, in which the presence of a source of monochromatic light, placed in the immediate vicinity is usually a multimode optical fiber, on which you want to generate the corresponding peak is difficult for reasons of lack of space or, more generally, due to the difficult location of aggregate equipment for the implementation of such peaks, the light source used, providing the photopolymerization can be a source of incoherent white light.

In accordance with a third aspect of the present invention were developed General techniques of connection of optical elements, which can be used in different ways.

The main types of optical connections in accordance with the invention presented here as non-limiting examples, illustrated in the accompanied drawings.

Figure 4 shows schematically the type of connection of two single-mode or multimode optical fibers.

Luminous flux 7, providing photopolymerization,is introduced into the ends of the two subject and located on the same line of optical fibers 4. The contact between the optical fibers is provided with an appropriate polymeric material, presented in the form of a film 8 formed in accordance with the same process, which claimed for the implementation of the mentioned peaks. Thus obtaining the so-called "cold" weld, an optical membrane, representing, for example, glue, refractive index which is smaller than the refractive index of the above-mentioned films, and mechanical protective sheath. Loss arising due to the inclusion of such compounds, can have a value of less than 0.1 dB.

Figure 5 schematically presents one of the possible types of connection of the laser diode 9 with the optical fiber 4.

In this type of connection peak 3 on the end face of the optical fiber 4 has parameters selected so that the relationship between the laser 10 and the peak 3 was the maximum.

Connection, schematically presented in figure 4 and 5, shown here only as an example.

Connection integrated optical waveguides, for example, despite the number and complexity of optoelectronic circuits they contain, can be carried out in accordance with the above-described relatively simple technologies.

In accordance with a fourth is an object of the present invention on the end of a multimode optical fibers form the peaks, which can only distribute one or more modes.

Before exposure the exposure to light caused drops used polymer material select one or more desired modes, exposing multimode optical fiber mechanical stress and modifying conditions introduction in this fiber green light up to obtain one or more desired modes.

As example (6) on the optical fiber with the thickness of the core, part 9 microns (figa), form a dual polymer peak 11, the transmitting of the input radiation 12 only fashion LP 11 (figure 4). The intensity distribution 12bis transferred via a double peak 11 (figa), and it is the same intensity distribution, which has enabled the production of a double peak 11. On fig.7b presents polymeric element with a double peak after its manufacture.

Conversely, the polymer peak 11 can be used as an input to an optical fiber, illuminated by the incident light beam 12 (fig.6b), in this case, the light energy is transmitted through the peak 11 in accordance with a spatial distribution corresponding fashion LP 11, as in the selected example. Only one mode LP 11 is excited in this optical fiber under all conditions of introducing light into an optical fiber.

In the accordance with another example implementation was made of multicomponent polymer which provided the opportunity to choose the fashion LP 21 multimode optical fiber having a core diameter average of 9 microns. The intensity distribution at the output of this optical fiber, which is light 12 in accordance with the fashion LP 21 using peak presented on figa. On fig.8b shown polymeric element with 4 peaks after its manufacture.

In accordance with the invention can, therefore, implement the filtering of transverse modes and, more generally, to get a new device called "Switch mode".

In accordance with a fifth object of the present invention use the new supplied with the lenses of the optical fiber that is optimized on the basis of this invention, as, for example, probes for the measurement of optical radiation, which is a high resolution submicron order.

As an example of the use of new probes figure 9 schematically presents made in accordance with the invention measuring the energy emitted by the laser 13, in particular the configuration of the curves of the optical field at the output of this laser.

The laser 13, used in the experiments is a laser diode, distributed in the market by the firm of SHARP and having an active layer with a width of 200 μm.

Equipped with lenses the second end of the optical fiber 4, equipped its peak 3, consistently placed in three planes, respectively located at distances from this laser diode constituting 2.5 μm, 1 μm and 0.1 μm.

Other not containing the lens end of the optical fiber 4 is connected to the photomultiplier tube 14, for enhancing the sensitivity of the measurements.

Figure 10 shows the optical image of the laser diode, obtained at three distances components respectively 2.5 μm, 1 μm and 0.1 μm, and is used in this case is equipped with a lens in the optical fiber is moved inside the surface area of 8×8 μm2. When considering the images presented on figure 10, it can be noted that the smaller the distance from the peak to the laser diode, the more visible it becomes the active layer of the laser. At the same time for the same distance of 2.5 microns, peak to the surface of the optical fiber 4 can clearly distinguish gradually decreasing curves of the optical levels.

In accordance with a sixth object of the invention is an optical fiber fitted lenses, intended for use in microscopy and in the implementation of the respective probes.

In the case of the use of such optical fibers in the field of optical microscopy with classical scanning is used, how it is tematicheskie illustrated by figure 11, these new optical fiber containing lenses, as probes for measuring light scattered by the surface of the investigated object 15, illuminated by an external light source 16. The movement of this is provided by the lenses of the optical fiber above the surface of the investigated object enables you to obtain the optical image of the examined area of the object.

Thus, it is possible to realize an optical scanning microscopy with high resolution using probe simple design and very low cost.

In the case of the use of such optical fibers in the field of optical microscopy in the near optical field of polymer peak optical fiber that is optimized in accordance with the invention, made entirely metallic (Fig), except for a small round hole 18 made in the metallization 17, the diameter of which is usually the amount of several tens of nanometers. This tiny hole remains able to emit or receive light in experiments on optical microscopy in the near optical field. Such an optical fiber with a metallic peak plays a decisive role in the implementation of nanotechnik or nanoconductor light emission depending on the specific application.

is atall, which in this case is used for almost complete coverage of the polymer peak, is a chrome or gold.

In accordance with the variant of realization of submicron probe is schematically presented in Fig, integrate fluorescent particles 19 in used in this case can be photopolymerization polymer material, in order to get the end of the peak containing several particles, selective optical excitation which improves spatial resolution by using such optical fibers in the field of optical microscopy. The sizes of fluorescent particles introduced into the composition of the used polymer material, have a submicron order. The concentration of the fluorescent particles is controlled so as to ensure that after the formation of this peak the placement of one or more of such particles directly at the end of this peak. Then the fluorescence of the excited particles in a selective manner through the optical fiber to have a localized light source 15, is able to probe in the near optical field of the optical properties of the test sample with a resolution of submicron order.

It should be noted that the same approach to the implementation of the probes with a resolution of submicron Radka, intended for use in the field of optical microscopy in the near optical field with the introduction of fluorescent particles was recently recognized as valid and legitimate researchers J.MICHABLIS, etc. However, the method used by these researchers is very complex and does not provide, in addition, from a certain angle, adhesion of fluorescent particles at the end of the used probes.

Optical probe with fluorescamine particles in accordance with one of the objects of the present invention allows the use to obtain much more simple and reliable process.

In the framework of the above-mentioned sixth object of the present invention described above sputter probes, but not having mentioned the microscopic aperture can be used as sensors with surface plasmons. In this case you use single-mode or multimode optical fibers with lenses and improved in accordance with the invention.

In this case, the polymer peak contains a thin covering made preferred by way of gold or silver.

Providing the introduction of the light flux in the other cut end of the optical fiber, and they find themselves in conditions of excitation of surface plasma is s on the boundary surface between the metal and air you can modify the characteristics of these plasmons by changes in the optical refractive index of the external environment. Thus, the presence of chemical or biological substances that are in contact with the metal layer, causes a modification of the optical properties of plasmons, i.e. the change of the light signal transmitted through or reflected by the end of the optical fiber equipped with a metalized polymer peak.

1. A method of manufacturing a single-mode or multimode optical fibers with lenses of multimode fiber by forming at least one end of the peak of transparent polymer material, which is applied on at least one end face of the optical fiber mixture in the form of drops containing photopolymerizable substance and at least one photoinitiator polymerization, carried out the irradiation caused a drop light source for implementing light photopolymerization, characterized in that before the exposure of one or more desired fashion, exposing the optical fiber at least mechanical stress during deposition of drops and exposure control and management the shape and size of the peak for a given radius of curvature and the peak height in the range from several microns to several with the ten microns, while this method further comprises the following operations:

maintain the mixture at a given temperature before irradiation to achieve the mixture viscosity, which allows to obtain the desired height drops,

adjust the exposure time and/or intensity of light of photopolymerization for regulation of the finite radius of curvature of the peak.

2. The method according to claim 1, characterized in that regulate the oxygen content in the air in the immediate vicinity of the peak, for the regulation of the end of the specified radius of curvature peak Inuktitut nitrogen in a sealed chamber to control the action of oxygen on the surface of the contact drop/air and on the radius of curvature of the peak.

3. The method according to claim 1, characterized in that it further carry out a preliminary treatment by mikania ends of the fibers in the acid for modifying the viscosity of the mixture, determining the surface tension, to obtain low altitude drops.

4. The method according to claim 1, characterized in that it further irradiation drops provide source light beam which passes across the length of the fiber.

5. The method according to claim 1, wherein the photopolymerization required for the formation of peaks is performed with the use of an external source for multimode fiber, emitting light for photopolymerization not in posredstvennoj vicinity of the peak without the introduction of another light from another end of the fiber, which propagates along the fiber.

6. The method according to claim 1, wherein the photopolymerization required for the formation of peaks, carried out using a source of white incoherent light, which is injected from the end of the fiber opposite to the peak.

7. The method according to claim 1, characterized in that the size of the peak and the shape of the end of the peak is chosen in such a way as to obtain a focused beams or collimated beams.

8. The method according to claim 1, characterized in that the size and shape of the peaks regulate for the manufacture of connectors, the fiber to fiber, the light for photopolymerization sent during exposure to the ends of the two adjacent optical fibers for the formation of a layer of a mixture of small thickness, which forms the contact between the optical fibers.

9. The method according to claim 1, characterized in that the size and shape of the ends of the peaks provides maximum optical connection between the optical fiber and a laser diode.

10. The method according to claim 1, characterized in that the optical fiber is used for connection of optical fibers or embedded circuits, optical multi-use complexes, while the peaks of each fiber used in the connectors, regulate separately on demand.

11. The method according to claim 1, characterized in that the peaks are used as probes to measure) is implemented to obtain a lateral resolution of submicroscopic type for use in optical microscopes, having a high resolution scan.

12. The method according to claim 1, characterized in that it further added to the polymerized mixture to the peaks of the fluorescent particles after polymerization act as a localized source of radiation at the end of the peak.

13. The method according to item 12, wherein the localized radiation source is formed of at least one fluorescent particle, sufficient for sensing optical properties of a sample in the near field.

14. The method according to claim 11, characterized in that the polymer peak put a layer of metal, with the exception of one round sensitive nanoalberta made at the end of the peak.

15. The method according to claim 11, characterized in that metallizer peaks by applying a metal layer on the polymer peak, with peaks metallized thus used as probes of surface plasmons, the characteristics of which are modified by changing the refractive index of the environment in the presence of chemical or biological substances in contact with the metal peak.

16. The method according to claim 1, characterized in that photoinitiator polymerization mixture is sensitive to the wavelength of red and near-infrared color.

17. The method according to claim 1, wherein the pre-process the ends of the fibers by immersion in acids is to obtain the desired viscosity, associated with surface tension, and thus receive the low height drops and light for photopolymerization sent during irradiation in the region in the immediate vicinity of the peak, without the introduction of another light from another end of the fiber that propagates along the fiber.

18. The method according to 17, wherein the photopolymerization required for the formation of peaks, carried out using a source of white incoherent light, which is injected from the end of the fiber opposite to the peak.

19. The method according to 17, characterized in that it further regulate the size of the peak and the shape of the end of the peak thus, to obtain a focused beams or collimated beams.

20. The method according to claim 19, characterized in that it further added to the polymerized mixture to the peaks of the fluorescent particles after polymerization act as a localized source of radiation at the end of the peak.

21. The method according to claim 20, characterized in that a localized radiation source is formed of at least one fluorescent particle, sufficient for sensing optical properties of a sample in the near field.

22. The method according to claim 19, characterized in that the polymer peak put a layer of metal, with the exception of one round sensitive nanoalberta made at the end of the peak.

2. Single-mode or multimode optical fibers with lenses manufactured by the method stated in paragraph 1, characterized in that the chemical composition of the mixture used to form peaks, has the desired viscosity and the height of drop of the polymer material is in the range from several microns to several hundred microns.

24. The optical fiber according to item 23, wherein the peaks made on the end face of the optical fiber, designed for distribution on fibre only one or a few modes, selected in advance.

25. The optical fiber according to item 23, wherein the peaks at the ends of the optical fibers are metallized, except nanoalberta able to play the role of nanotechnik or nano-receiver light for use in an optical microscope in the near optical field.

26. The optical fiber according to item 23, wherein the peaks at the ends of the optical fibers are metallized to form the sensor surface plasmons.



 

Same patents:

Optical element // 2213987
The invention relates to optoelectronics and can be used in the processing of optical information from the optical fiber measuring networks

Optical isolator // 2204155

Beam expander // 2183337
The invention relates to integrated optics and can be used as an extender optical beam propagating in the optical waveguide, collimating or selectivity of the element in different integrated-optical elements and circuits, with the creation of tunable filters for frequency seals signals in fiber-optic communication systems

The invention relates to passive components, fiber optic equipment, and specifically to devices of input optical radiation into the fiber light guide

The invention relates to an optical instrument, in particular to the class of optical converters

The invention relates to a telecommunications system that includes optical amplifiers included cascade, and intended mainly for multiplex transmission with separation of wavelengths, and the combination of dopants in an optical fiber allows to achieve a high signal-to-noise for all channels in the specified wavelength range even when there are multiple signals simultaneously introduced into the fiber, which is achievable technical result

The invention relates to fiber-optic transducers of physical quantities (temperature, pressure, acceleration, and other) using micromechanical resonators excited by light

The invention relates to fiber-optic transducers of physical quantities (temperature, pressure, acceleration, and other) using micromechanical resonators excited by light

The invention relates to the field of hydro-acoustics and can be used in laboratory and field conditions to measure sound waves in the liquid

FIELD: the invention refers to the mode of manufacturing lens in the shape of peaks on the end-faces of single-mode and multi-mode optical fibers.

SUBSTANCE: the manufacturing mode is in plotting drops of polymerized substance on the end-face plane of the fiber, radiation of the plotted drop with a source of light for realization light photo polymerization. At that before exposure they choose one or several desired modes subjecting the optical fiber to mechanical strains, at the stages of plotting the drop and radiation they execute control and management of the form and the sizes of the peak, before the radiation stage they hold out the mixture at the given temperature for achieving viscosity of the mixture which allows to get the needed height of the drop, regulate duration of exposure and/or intensity of the light for regulating the end radius of the curvature of the peak.

EFFECT: provides possibility to get peaks of different heights and different radiuses on the end-face planes of the optical fibers and also provides possibility to control the indicated parameters of the peaks in time of their manufacturing.

26 cl, 13 dwg

FIELD: electrical engineering .

SUBSTANCE: device for introduction of laser emission in fibre, which contains optical single-mode or multimode fibres equipped with microlenses that are shaped of transparent materials, differs because microlenses are made of optical glass, refractive exponent of which is higher than the refractive exponent of light conducting thread of fibre, in the shape of sphere that embraces light conducting thread at the end of fibre, and the end surface of fibre is made in the form of polished cylindrical surface, besides, axis of cylindrical surface intersects with fibre axis and is perpendicular to fibre axis.

EFFECT: increases coefficient of emission introduction and reduces dependency of introduction coefficient on misalignment.

5 cl, 5 dwg

FIELD: physics; optics.

SUBSTANCE: invention relates to devices for splitting optical fibres, specifically to manual portable instruments. The mechanism for breaking optical fibres contains apparatus for breaking fibres and one or more clamping elements which can clamp an optical fibre at one end, which should be cut off, and apply a pulling force so as to stretch the fibre when breaking it. The mechanism is designed such that, the clamping element(s) can also push the broken part of the fibre using devices which enable the clamping element(s) to continue applying a pulling force to the cut off part of the fibre after breaking. The clamping element or each clamping element releases the cut off part when moving the cut off part of the fibre.

EFFECT: high quality joining and reliability of fibres.

11 cl, 15 dwg

FIELD: physics.

SUBSTANCE: fibro-optical connector comprises first and second half-couplings to receive first and second sections of optical fiber. First and second pairs of step-down optical multilayer transformers are arranged on end faces of said sections. Air gap is arranged between outer layers of said first and second pairs of said transformers. Layers of first and second pairs of aforesaid transformers are made from materials with differing indices of reflection and are counted from outer layers of aforesaid transformers in direction of the end faces of connected sections of optical fiber. Thickness of every layer makes one fourth of average signal wave λ0 transmitted over optical fiber, while the number of layers is selected subject to conditions covered by invention claim.

EFFECT: reduced power loss, expanded performances.

4 cl, 9 dwg

FIELD: physics.

SUBSTANCE: fibre-optic connector has first and second half couplings for sealing first and second sections of optical fibre on whose butt ends there are first and second pairs of step-up and step-down optical multi-layer transformers. There is an air gap between the outer layers of the first and second pairs of optical multi-layer transformers. Layers of the first and second pairs of optical multi-layer transformers are made from materials with different refraction indices and are measured from outer layers of step-down transformers of the first and second pairs of optical multi-layer transformers adjacent to the air gap towards the butt ends joined to optical fibre sections. Thickness of each layer is equal to a quarter of the medium wave Xo of the signal transmitted over the optical fibre and the number of layers is selected based on conditions given in the formula of invention.

EFFECT: lower level of power loss arising due to insufficiently close contact or welded joint at the position of the joint and wider range of apparatus for this purpose.

4 cl, 7 dwg

FIELD: oil and gas extraction.

SUBSTANCE: fibre-optic rotating connector with a symmetrical structure has a housing in which there is a first and a second fibre-optic waveguide. The first fibre-optic waveguide is mounted in the first optical terminal piece which is fixed in bearing housings with possibility of rotation. There is a spacer ring between the bearings. The second fibre-optic waveguide is mounted similarly. The optical terminal pieces are pressed to each other by springs and coupling nuts. Displacement between optical axes of the fibre-optic waveguides is the limiting value of the radial beat of the inner ring of the roller bearing is defined by the expression: where α is the radius of the fibre-optic waveguide, Pi is the power at the end of the transmitting waveguide, Pp is the power at the end of the receiving waveguide, z is the distance between ends of interfaced waveguides, NA is the numerical aperture of the fibre-optic waveguide, r=α+z·tgα is the radiation field distribution radius in the plane of the end of the receiving waveguide, sinα=NA.

EFFECT: simple design, reliability, low optical loss.

4 cl, 1 dwg

FIELD: physics.

SUBSTANCE: optical cable connector has an invar housing in form of a bushing on whose two sides of which there are two nodes through which cables pass. The node which can rotate consists of a shaft with a stepped hole along the axis, bearings and a spacer bushing. The rigidly mounted node consists of a bushing superimposed with a ferrule. The ferrule has a lateral recess which is filled with gel and is closed with a casing. Cleared ends of the cables are placed in the lateral recess.

EFFECT: more reliable operation and miniaturisation.

3 cl, 4 dwg

FIELD: physics.

SUBSTANCE: apparatus has two collimating units which can turn relative each other around an axis of rotation, and one optical element which compensates for rotation. A first power splitter receives input signals and splits said signals into at least two signals for transmission over at least two optical channels through the collimating units and the optical element compensating for rotation. After passing through the second collimating unit, the signals are combined into one signal in a second power splitter. A version of the apparatus has an optical attenuator which is connected to one component from the first collimating unit, the second collimating unit and the optical element compensating for rotation, or a gear which rotates the optical attenuator. In one of the versions, the attenuator is controlled by a controller.

EFFECT: minimisation of change in attenuation in a rotary joint during rotation, as well as provision for transmission of analogue optical signals which carry information encoded in the amplitude or level of the signal.

17 cl, 9 dwg

FIELD: physics.

SUBSTANCE: thermal detector has an illuminating and a receiving light guide, the first ends of which are connected to a light source and a photodetector, and second ends to a guided Y fibre-optic splitter, the common input/output of which is fitted with a heat-sensitive element, having a mirror surface and made in form of an opaque blind made from material with shape memory effect, attached by one end to the butt-end of a measuring light guide. The blind is given reversible shape memory at flexure. In the initial state, below the direct martensitic transformation temperature, the free end of the blind is tightly pressed by the mirror side to the butt-end of the measuring light guide, thereby completely covering the aperture of the light guide. In a state higher than the inverse martensitic transformation temperature, the free end of the blind deviates by an acute angle from the plane of the butt-end of the measuring light guide.

EFFECT: faster operation owing to reduction of the size and weight of the heat-sensitive element, simplification, reduced loss when transmitting reflected light flux to the receiving light guide and high sensitivity owing to significant change in intensity for small temperature changes.

5 dwg

FIELD: physics.

SUBSTANCE: photopolymerisable composition contains a polymerisable component, e.g., a monomer or mixture of monomers, ortho-quinones and a reducing agent, e.g., an amine, with the following ratio of components, pts.wt: polymerisable component 100, ortho-quinones 0.005-0.1, reducing agent 0.5-10.0, for connecting light guides. The invention also relates to a method and a device for connecting light guides using said composition.

EFFECT: use of the present invention simplifies, speeds up and reduces the cost of connecting light guides, and enables to achieve higher quality.

11 cl, 1 ex, 2 dwg

Up!