The device input/output optical radiation into the fiber light guide
(57) Abstract:The invention is used in fiber-optic communication lines and provides increased efficiency light direction and junction forward and reverse communication channels. The device input/output radiation in the fiber light guide includes a main waveguide and directional coupler. The tap is made in the form of fiber-optic chords tap, the total end of which is mounted relative to the end of the main optical path with a certain gap. 1 Il. The invention relates to passive components, fiber optic equipment, and specifically to devices of input optical radiation into the fiber light guide.The development of a variety of communication systems based on fiber optics requires the creation of a broad set of functional elements in optical performance. To save systems with complex architecture requires the development of effective devices input/output information.Known input device radiation  ,  on the principle of spatial division of the luminous flux in the form of a corner cube reflector, which radiation from the source sends its fiber is config tap. It consists of two twisted and fused segments of the optical fibers.A common shortcoming for the considered devices is the low efficiency of the directivity of the transmitted light flux and low junction forward and reverse flows of light. Luminous flux output of main optical path after the split in equal parts is directed to the photodetector and the radiation source. At the entrance of main optical path of the luminous flux from the radiation source as a result of weak junction channels illuminates your sensor.The closest to the essence of the present invention is the device I / o-based lock detector  . The radiation from the source is introduced into a segment of single-mode fiber and then goes into the main optical path. At the other end of the path is joined with another segment of single-mode fiber. The optical signal from the main tract is not fully reaches the end of the single-mode fiber, and is dissipated at the junction of these fibers and going through the photodetector.The main disadvantages of this device I/o is the low efficiency of the light direction of the forward and backward radiation.The aim of the present invention is to improve the efficiency of light direction and junction forward and reverse communication channels.This goal is achieved by the presence in the line termination device input/output radiation representing a fiber-optic chords directional coupler, the total end face is set towards the end of the main optical path with a certain gap.New in this invention is matching device made in the form of fiber-optic chords optical coupler, the total end of which is installed a certain gap relative to the end face of the main tract. Matching device directs the major part of the light flux to the light receiver and only a small part returns to the source, thereby allowing to obtain a new a higher level of efficiency of the radiation pattern and decoupling of direct and reverse data channels.The gap between the end face of the coupler and the trunk optical fiber is calculated according to the formula (see drawing):
where D is the diameter of the trunk of filaments is the gadfly of the tap.The degree of decoupling of direct and reverse data channels is determined by the expression:
where Pand- luminous flux on the emitting end face of the Central optical fiber coupler;
Pp- luminous flux entering into the receiving fiber optic cable tap.The relationship between the light threads on the ends of the emitting and receiving optical fibers is determined by expression:
where K is the reflection coefficient from the end of the main optical path;
and is the radius of the main optical path;
R is the equivalent radius of the fiber.This matching device was implemented in the current line. The core diameter trunk light gadfly 62.5 μm, the diameter of the fiber in the coupler 25 μm, a gap of 50 μm, the level of the junction between the forward and reverse channels 65dB.Sources of information
1. Iga H. , Oikawa M , "Stacked Planar Optics. Proc. Integr. Opt. and Opt, Fib. Comm. Conf. ", Tokyo, 1981, p. 493-494.2. Masuda S, Iwama T. "Single-mode Fiber optic Directional Coupler", Appi opt. 1982, v. 21, p. 3484-3488.3. The Belovolov M. I. , Dianov E. M. , Archer, A. C. , "Fiber optic directional couplers with low losses", Quant. electronics. 1985, 12 so.4. Andreev, A. A. , M. Butusov M , Rudenko centuries "Detection the Oia in the fiber light guide, including the main waveguide and directional coupler, characterized in that, to increase the efficiency of light direction and junction forward and reverse communication channels, the tap is made in the form of fiber-optic chords tap, the total end of which is mounted relative to the end of the main optical path with a gap, the magnitude of which is determined by the formula
< / BR>where D is the core diameter of the main light guide;
D1the core diameter of the optical fiber coupler;
NA is the numerical aperture of the fiber coupler.
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
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
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
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
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
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.
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