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Fibre-optic connector

IPC classes for russian patent Fibre-optic connector (RU 2383041):

G02B6/38 - having fibre to fibre mating means

Another patents in same IPC classes:

Optical fiber connector and method of its application / 2375730
Proposed connector assembly comprises connector (10) made from material with shape memory and having casing (16), connector channel (22) running from first end (18) to second end (20) and having multiple pins (24, 26), first and second flanges (34), and connector socket consisting of four parts (38) that make, when assembled, a connector chamber. Two of aforesaid assembled parts make first end, the other two parts make the connector socket second end, both parts being arranged to allow applying expanding force to connector (10) and flanges, fitted inside aforesaid chamber, by axially rotating connector socket first end relative to second end. In compliance with second version, every aforesaid end has a hole and passage through channel between said hole and connector chamber, while connector assembly additionally comprises needle (54) to be inserted through said hole, to expand aforesaid channel on inserting said needle through said channel.

Fibre-optic connector / 2372631
Fibre-optic connector for mechanical splicing of first and second optical fibres with removed coatings has a case which is divided into sections which are arranged such that, optical fibres can be clamped. The case has at least three independently opening main clamping sections, with dimensions which allow for directly clamping the naked part of the first and second optical fibres, and at least one additional independently opening clamping section with dimensions which allow for clamping the coated part of one of the optical fibres. Clamping sections are made such that, the first optical fibre can be clamped by the first main clamping section independent of the second optical fibre, making it possible to clamp the first optical fibre from rotation and axial displacement relative the case of the connector, so as to essentially leave untouched the next clamping or unclamping of the second fibre. The second of the three main clamping sections can only clamp the second fibre, and the third can only clamp the first and second fibres at the same time.

Multifunctional socket coupler and multifunctional coupling plug assembly for optical fibre installation / 2358297
Proposed multifunctional socket coupler and multifunctional coupling plug assembly contains the socket coupler base (11) and the socket coupler polymeric protective cover (21) with electric connection throughholes (151a, 151b) and the fibre throughhole (131, 131a, 131b) distanced from the electric connection throughholes (151a, 151b). It also contains a guide element (23, 91, 93) designed to provide for the optical fibre (61) cleared end reception and positioning in a pre-defined relationship to the fibre throughhole (131) and a clamping element (71, 83) for the optical fibre (61) reversive clamping with the fibre end in a pre-defined relationship to the fibre throughhole (131). The above socket coupler polymeric protective cover (21) is designed to enable axial and transverse direction of the optical fibre.

Device for seizure and splicing of optic fibers / 2350988
Invention is related to device for seizure and splicing of optic fibers. Device comprises part that has hingedly joined the first and second elements. Part has seizure area, which includes the first and second seizing parts, which are located on the first and second internal surfaces of every element. Part additionally comprises the first and second areas of compression along length of seizure area. Device for seizure and splicing of optic fibers additionally comprises tip arranged with the possibility of engagement with part for selective actuation of the first compression area independently on actuation of the second compression area.

Fiber-optical socket (versions) / 2345389
Invention concerns fibre optics and optronics. It can be applied to linking of groups of fiber-optical cables among themselves. In the socket the centralisers are executed from an elastic material. One of edges of a gash of every centraliser is fixed in a socket material. On other edge from each leg of a tip there are salients. From each leg of the fiber-optical socket the slider is available. There are holdfasts of an open standing of the socket. At centre of each of the socket legs, there are the buttons relieving a holdfast. Each fiber-optical plug has the mobile lattice of squeezing of springs or an elastic material for plug tips springing. In each plug there is a lever. There is a device of fixing of a lattice. Vacuities of the centralisers densely sweep plug tips. Thus moves a slider, fixing a plug in the socket and voiding the mobile lattice for travel. The elastic material creates necessary effort of squeezing of end faces of tips.

Connector for optical fibers / 2323460
Connector used for connecting two optical fibers has longitudinal case. Case has first end and second end. Case is provided with channel for fiber, which channel goes along axis from mentioned first end of case to mentioned second end of case. Case is made for reception of mentioned ends of two optical fibers. Case is divided to multiplicity of fingers, which fingers go in longitudinal direction in any end of first and second ends of case. Fingers in first end of case are shifted along circle for preset value from fingers at second end of case. Fingers at first end of case overlap at axial direction fingers at second end for preset value. At least some of fingers have parts in form of harmonicas, where fingers are divided to multiplicity of harmonica-shaped fingers which go in lateral direction. Case is made to be brought into open position to contain mentioned optical fibers in channel for fibers. Case is also made for deformation uniformly after it is brought into mentioned open position. As a result, case is made for perform of sequence which consists in centering of mentioned optical fibers, compression of mentioned optical fibers one against other and clamp of mentioned optical fibers to fix those fibers at preset position. Case is made for application of first stresses in that site of channel for fiber where mentioned optical fibers make contact one with other. Case is also made for application of second stresses close to first and second ends. Mentioned second stresses exceed essentially mentioned first stresses.

Sleeve for fiberglass connectors with adjustable protective shutter / 2318227
The sleeve contains mobile cover, engaged with barrel aperture. In first position the intersection laps over the barrel aperture. On insertion of plug connector it moves to second position. Intersection frees the barrel aperture. Intersection contains curved metallic flat spring. The flat spring in first position is unloaded. The curve of the flat spring is selected in such a way, that the tip of plug connector never comes into contact with flat spring at any moment of concatenation process. The flat spring is positioned tangentially to side surface of connecting part. Two wings are positioned adjacently to the side surface, by means of which wings the intersection is connected to internal surfaces of connecting part body.

Method and device for joining optical fibers / 2295143
Method comprises connecting first fiber (20) with first specially oriented key member (4), setting key member (4) into holder (29) that receives the key member only when it is specially oriented, cutting fiber (20) at a given angle with respect to holder (29) to form a sloping face (24) of the fiber, removing the key member from the holder, setting the key member into housing (2) of the device for joining that receives the key member only when it is specially oriented so that sloping surface (24) of the fiber is in a given radial position with respect to the housing of the device. The operations are repeated for second fiber (21) and second key member (5).

Connecting device for fiber-glass connectors and a connecting sleeve / 2277252
Device contains front panel 2,4,202 and simplex or two-channel connecting sleeve 1,1',1'',201,207, made with possible insertion into front panel 2,4,202 and with possible disengagement from front portion side, and containing connecting sleeves, which are made with possible blocking in front panel 2,4,202 by means of blocking springs 14,14',14'',214. Besides pin sockets 21,41 for inserting connecting sleeves, front panel 2,4,202 has apertures 22,23,45,46 made in several positions on its front portion for disengaging connecting sleeves, which have flanges 12,121,212,212' for positioning on frontal portion of front panel 2,4,202, and blocking spring 14,14',14'',214 for hooking to front panel 2,4,202 behind the latter.

Light guide / 2248023
Device has body and elements for pressurization of light guide. In hollow of body pressurizing element is inserted, in form of resilient compactor vulcanized on optic cable with glue previously applied to vulcanization area and made with conic outer surface at one end, contacting with body, and at other end pressing nut is mounted. Between guiding elements of guide and body compacting rings are placed.

Duplex connector for fiberglass pin connectors / 2247415
Device has two fixing devices for receiving two single pin connectors with forming of one duplex pin connector. Fixing means are made so that they envelope at least partially the pin body and means for protecting cable from bends, to be subject to placement in socket of pin connector. Fixing means is made in form of C-shaped socket, to which rectangular socket is adjacent, practically having L-like shape. On upper side of device an arc-shaped element can be placed, which in fixed position of simplex pin connectors envelopes their contacts.

FIELD: physics; optics.

SUBSTANCE: connector consists of two opposite hollow half-couplings inside of which there are connected optical fibre sections. On butt-ends of the optical fibre sections there are optical multilayer transformers which provide matched non-reflection transition from the optical fibre medium with refraction index n_of>1 to air medium (n₀=1) of a gap with size of 1-2000 the medium wavelength of the signal transmitted through the optical fibre (λ₀) formed by between the outer layers of the opposite optical transformers.

EFFECT: lower power loss level at the joint in the given wavelength range.

4 cl, 8 dwg

The invention relates to the technical field of fiber-optic transmission systems, in particular for fiber-optic connectors.

Known optical connectors (OS) contact type, in which the minimum power loss in the connectors is achieved by increasing seal the joined optical fiber (S) to each other over the entire surface of the ends S.

A device for connecting optical fibers (see U.S. patent No. 5857045, IPC G02B 6/38, publ. 20.05.1997 year).

The known device includes: a socket consisting of a first body of a predetermined length, provided with grooves cut along the length through the center of the contact surface, and the second body. similar to the first extending elements for separating the first and second body and provides input optical fibers in the cut grooves and means bending, extending outer surface socket outlet, which securely holds the first and second body together and provides the necessary locking force.

The disadvantage of this device for the connection of optical fibers is relatively high losses in the connector.

Also known connector for optical fibers with separable system (see U.S. patent No. 5067783, IPC G02B 6/36 from 16.10.1990,).

The known connector, the optical fiber contains two gathered sleeves at the ore one of them contains the locking key. The connector is provided with a separate block containing a tubular part provided with a longitudinal keyway keyway and lock.

The disadvantage of this connector fiber optic cable is relatively high losses at the connection of optical fibers.

The closest to the technical nature of the claimed optical fiber connector is a fiber optic connector reciprocating (see RF patent №2126545, IPC G02B 6/38).

Fiber optic connector-prototype contains a frame, first and second coupling halves to be embedded in them, respectively, the first and second segments of the optical fibers and the latch. The latch is made in the form of two flexible latch levers attached to the outer surface of the coupling. Disconnect the connector from the socket part is made by pulling the coupling halves, resulting in a beveled surface of the frame cooperating with the latch levers, lifting them and freeing from the reeds of the socket part.

A disadvantage of the known fiber optic connector is a relatively high level of power loss of signal caused by the instability of the contact ends of the RC. In addition, the resistance change of the contact transition due to gapping ends S leads to distortion of the signal.

The aim invented the I is to develop a fiber optic connector, providing reducing power losses at the connection point in a given range of wavelengths for a wide class of fiber-optic connectors. The claimed device expands the Arsenal of tools for this purpose.

This objective is achieved in that in the known fiber optic connector containing the first and second coupling halves to be embedded in them, respectively, the first and second segments of the optical fibers and the latch that fastens the first and second coupling halves, revealing each coupling plugged, congruent with the aperture coupling. Each coupling half are keyed and hole for optical fibers. In addition, the ends of the first and second segments of the optical fibers are installed respectively in the first and second optical multi-layer transformers (OMST and OMST). OMCT consist respectively of N₁and N₂layers made of materials with different refractive indices n_1iand n_2j,

where i=1, 2...N₁; j=1, 2...N₂- number of layers, respectively, the first and second OMCT. The number of layers of the first and second OMCT counts from the ends respectively of the first and second segments of the optical fibers. The thickness of each layer is a quarter of the average length of a wave λ₀the signal transmitted on the optical fibers. The number is about layers of the N ₁and N₂the first and second optical multi-layer transformers selected terms and conditions:

where n_AVand n_CC2the indices of refraction of the optical fibers of the first and second connected sections, a Δa₁and Δa₂- set values working attenuation of the first and second optical multi-layer transformers.

Assembled in the connector between the outer layers OMST and OMST selected air gap Δ in the interval Δ=(1...2000)λ₀.

In the connector retainer is made in the form of a cylinder mounted on the outer surface of the first and second couplings. The cylinders are equipped with a threaded connection.

The refractive indices of the i-th and j-th layers of the n_1iand n_2jbelonging respectively to the first and second OMCT is calculated by the formula:

Thanks to this new essential features is ensured smooth coordination of the impedances of connected segments of the optical cable by successive transformation of the indices of refraction of the optical fibers to the value of the refractive index of air. This allows contactless high approval of the connection of optical fibers and, therefore, reduce the sweat and the signal power at the connector.

Declared fiber optic connector is illustrated by drawings on which is shown:

figure 1 - General view of the connector;

figure 2 - view of the cross-section of the coupling;

figure 3 is a drawing explaining the General scheme of the connector;

figure 4 - structure of the optical multilayer transformers;

figure 5 - profile of the refractive indices of the optical multilayer transformers;

figure 6 - estimated wave characteristics OST (OST);

figure 7 - calculation of the wave characteristic of the attenuation of the fiber optic connector when the air gap is Δ=100λ₀=0.1 mm;

on Fig settlement of the wave characteristic of the attenuation of the fiber optic connector when the air gap A=2000λ₀=3 mm.

Declared fiber optic connector, shown in figure 1, consists of first 1 and second 2 hollow of the coupling. In the disclose customer of the coupling 1 and 2 installed plugs 3 and 4. The plugs 3 and 4 are keyed in the form of pins 5 and corresponding holes 6 (see also figure 2). The joined segments of the optical fibers 7 and 8 are installed in the cavities, respectively, the first 1 and second 2 parts of the coupling. To avoid possible deformation of the connected segments of the optical fibers 7, 8 in the cavity of the coupling 1 and 2 can be set guides cylindrical tubes 9 and 10. The plugs 3, 4 is equipped with otwartej, 12 with a diameter d (see also figure 2), corresponding to the diameter of the cross section of the segments of the optical fibers 7, 8. At the ends of the joined sections of the optical fibers 7 and 8, having a refractive index of n_AVand n_CC2installed the first 13 and second 14 OMCT, consisting respectively of N₁and N₂layer 16 (see Fig 4), made of materials with differing refractive indices n_1iand n_2jand where i=1, 2...N₁and j-1, 2...N₂- number of layers, respectively, of the first 13 and second 14 OMCT. The number of layers (see figure 4) counting from the end faces of the respective segments of the optical fibers 7 and 8, and their refractive indices have the meanings respectively n₁₁n₁₂...n_1N1and n₂₁n_22...n_2N2(figure 5). The coupling halves 1 and 2 is equipped with a latch 15. In particular, the latch 15 is in the form of two cylinders mounted on the outer surface of the coupling halves 1, 2. One of the cylinders is fixed on the outer surface of one of the coupling halves (figure 1 on the second coupling half 2)and the other is installed with the possibility of movement along the coupling (figure 1 - first 1). The coupling halves 1, 2 are clamped with commercially available cylinders threaded connections. The diameter D of the coupling halves 1 and 2 are selected from the technological conditions of their operation, for example, in the interval D=1÷4 see Segments of the optical fibers 7 and 8 are installed in the coupling halves 1 and 2 that is they way so that in the assembled condition of the connector between the outer layers OMCT 13 and 14 there was an air gap Δ in the range (1-2000)λ₀(see also figure 3 and figure 4). The thickness t of each layer OMCT 13 and 14 is selected equal to a quarter wavelength λ₀the signal transmitted on the optical fibers, i.e. t=0.25λ₀(figure 4). The number of layers N₁and N₂the first 13 and second 14 OMCT selected from conditions (1) and (2) on the basis of the pre-defined acceptable levels working attenuation Δα₁and Δα₂in the relevant OMCT 13 and 14. Refractive index of n_1iand n_2jthe i-th and j-th layers 16, belonging respectively to the first 13 and second 14 OMCT calculated by formulas (3) and (4).

Declared fiber optic connector works as follows. The main problem when connecting two segments of optical fibers is the reduction of power loss of signal in the place of their connection. Losses occur because of technological difficulties ensure perfect alignment of the surfaces of the ends of the joined sections of the optical fibers due to fatal fuzz face surfaces and, as a consequence, the scattering of a significant share of power. Losses increase significantly when the connection of segments of optical fibers with different refractive indices n_AVand n_CC2because of the abrupt change in pokazatel the second refractive index materials optical fibers.

In the claimed connector the influence of these causes of power losses are largely eliminated. This is explained in the following. Segments of the optical fibers 7 and 8 are fixed respectively in the first and second coupling halves. At the ends of the segments of the optical fibers 7 and 8 establish the first 13 and second 14 OMCT (see also figure 3 and figure 4). Functional purpose of OMCT is consistent decrease of the refractive index of the optical fiber n_AVthe first segment of the optical fiber 7 to the value of the refractive index of air n₁≈l (see figure 5). Second OMCT 14 solves the inverse problem: increases the refractive index from the values of n₀to the value of the refractive index of n_CC2the second segment of the optical fiber 8. This eliminates the need for rigid fixation surface of the end face of the first segment of the optical fiber 7 on the surface of the second 8. Full approval is provided by the air gap Δ. This simplifies the design of the connector.

The procedure for manufacturing OST (OST) can be shown by the example of its calculation with Butterworth.

Suppose you want to get OMST with the wave characteristic shown in Fig.6 with the following initial data:

is the refractive index of the material of the first and second segments of the optical fibers n_{the B1} =n_CC2=1.47;

- the maximum specified attenuation OST (OST) Δa₁=Δa₂=0,016 dB at the edges of the range of frequencies in the range from 176 THz up to 376 THz, which corresponds to wavelengths in the range from 1705 nm to 800 nm at an average wavelength λ₀=1087 nm.

Given the conditions of the problem values of n_AVn_CC2That Δa₁and Δa₂determined by the formulas (1) and (2) the number of layers OMST and OMST: N₁=2 and N₂=2. Then by the formulas (3) and (4) determine the values of the refractive indices of each layer respectively in OMST and OMST:

;;;

Figure 6 shows the calculated wave attenuation characteristic OST using the calculated refractive indices n₁₁and n₁₂The maximum attenuation at the edges of the given range of wavelengths is a₁=0,014 dB, which meets the specified requirement a<Δa₁,=0.016 dB. Working attenuation OMST with the same calculated values for OST, at the edges of the given range of wavelengths also has the value a=0,014 dB.

Figure 7 shows the calculated wave characteristic attenuation of a fiber optic connector comprising: OST - (air gap with Δ=100λ₀=0.1 mm) - OST. The maximum attenuation at the edges of the specified range the area wavelengths is 0,056 dB. This value is twice the sum of two OMCT Δa₁+Δa₂=0,014+0,014=0,028 dB, which can be explained by the influence of the fifth layer in the form of an air gap, introducing additional damping.

On Fig the calculated wave characteristic attenuation of a fiber optic connector comprising: OST - (air gap with Δ=2000λ₀=3 mm) - OST. The maximum attenuation at the edges of the given range of wavelengths is 0,056 dB.

The results of the calculations show a small dependence of the attenuation declared fiber optic connector from the value of Δ of the air gap, which ensures a reliable connection S in extreme conditions of construction and operation of fiber optic communication cables.

Obtained in the calculated examples of maximally flat response attenuation (Butterworth) shows that varying requirements for the attenuation at the edges of the given range of wavelengths, using formulas (1)...(4) can be designed connectors with small, close to zero, the transition value.

The example demonstrates the ability to build fiber-optic connectors with small specified requirements to the amount of power losses due to reflections and wave (frequency) characteristics of the attenuation in a given wavelength range. what dostoinstva proposed technical solution is a significant reduction in the attenuation of the connection to 0,056 dB at the edges of the working wavelength range in comparison with existing analogues, in which the attenuation across the entire operating band of wavelengths is from 0.3 to 2 dB. In addition, simplified maintenance connectors and reduces the time to improve reliability of the connector compared with existing connectors, which use additional means of monitoring, measuring, fastening and welding optical fibers. Reported advantages indicate that the use of declared fiber optic connector may achieving a technical result.

1. Fiber optic connector containing the first and second coupling halves to be embedded in them, respectively, the first and second segments of the optical fibers and the latch that fastens the first and second coupling halves, characterized in that in the opening of each half-coupling mounted bracket, congruent with the aperture coupling, are keyed and hole for optical fiber, additionally, on the ends of the first and second segments of the optical fibers are installed respectively in the first and second optical multi-layer transformers, consisting respectively of N₁and N₂layers made of materials with differing refractive indices n_1iand n_2jwhere i=1, 2...N₁, j=1, 2...N₂rooms layers respectively of the first and second optical m is gasloine filters, measured from the ends respectively of the first and second segments of the optical fibers, and the thickness of each layer is a quarter of the average length of a wave λ₀the signal transmitted on the optical fibers, and the number of layers N₁and N₂the first and second optical multi-layer transformers selected terms and conditions
and,
where n_AVand n_CC2the indices of refraction of the optical fibers of the first and second connected sections,
a Δa₁and Δ₂- set values working attenuation of the first and second optical multi-layer transformers, and in the assembled condition of the connector between the outer layers of the multilayer optical transformers selected air gap size Δ.

2. The connector according to claim 1, characterized in that the retainer is made in the form of first and second cylinders mounted on the outer surface respectively of the first and second coupling halves and provided with a threaded connection.

3. The connector according to claim 1, characterized in that the gap Δ is chosen in the interval Δ=(1-2000)λ₀.

4. The connector according to claim 1, characterized in that the refractive index of the i-th and j-th layers of the n_1iand n_2jbelonging respectively to the first and second optical multi-layer transformers, calculated by the formula: