SU1296981A1 - Optical signal splitter - Google Patents

Abstract

The invention relates to a light-guided communication system and reduces optical loss in a device. In the splitter, the harnesses of the transmitting 6 and the receiving 7 light guides are optically connected by a light guide-mixer made in the form of a hollow body filled with a liquid optically transparent medium. The refractive indices of the medium and the core of the optical fibers are equal. An optical signal arriving through one of the transmitting light guides 6 propagates in the light guide mixer as a combination of rays mixing in a narrowing part and uniformly filling its cross section. A portion of the optical radiation that does not enter the receiving optical fibers 7 enters the input ends of the additional optical fibers 8 located between the receiving optical fibers 7 and returns through them through the output ends to the light guide-mixer. 3 il. Ate ShShSh to with O) about 00 phi1.1

Description

The invention relates to the field of fiber-optic communication systems, in particular to optical couplers, and can be used to evenly divide the power of an optical signal between several fibers.

The purpose of the invention is to reduce optical loss.

Fig. 1 shows the construction of a splitter of optical signals, a general view; in fig. 2 - optical fiber-metering cable, section in the plane of the ends of the receiving optical fibers; on . 3 - the same section in the plane furthest from the mixer input end of additional light guides.

The power splitter of optical signals includes a housing 1, two tips 2, two nuts 3 with opposite winding, a hollow light guide-mixer 4, a liquid optically transparent medium 5, a tow of transmitting light guides. 6, the harness of the receiving light guides 7, the additional light guides 8. The harnesses of the transmitting and receiving light guides 6 and 7 together with the additional light guides 8 are glued into the corresponding tips 2 The ends of the transmitting, receiving and additional light guides protruding from the tips are inserted into the light-sensor-mixer 4, to the axis of the optical fibers and the light guide-mixer were parallel. To prevent mechanical damage, the light guide and additional light guides are inserted into the housing 1 and glued to it from the inside. Paddles 2 are secured with nuts 3 that are screwed into housing I.

Splitter optical signals works as follows.

The optical signal arriving at one of the optical fibers of the transmitting flage 6 enters the optical fiber-mixer 4 as a set of rays, the angle of inclination of which to the axis of the optical fiber-mixer does not exceed

 / NA. arcsin ()

T1 ..

NA is the numerical aperture of the transmitting fiber;

the index is the refractive index of the core material of the transmitting fiber and the optically transparent liquid filling the mixer.

981-2

Spread further in the narrowing part of the light-emitter 4, the rays are mixed, uniformly filling the cross-section of the light-emitter-blender and increasing the limiting angle of inclination to its axis, since the numerical aperture of the light emitting-blender in the narrowest part is larger than the numerical aperture

light guides in

DI

D.

time where

one

the diameter of the input end of the light guide-mixer, D is the diameter of the narrowest part of the light guide-mixer. If one chooses the refractive index of the wall of the mixer-fiber less than the value calculated by the formula

-SLfn OG (n. A h 1

By) P |

where n

 - the limit value of the refractive index of the wall of the fiber-mixer; n - refractive index

shells of transmitting light guides,

The rays do not leave the core of the mixer-fiber and propagate further in it, experiencing total internal reflection at the interface of the liquid optically transparent medium — the wall of the hollow optical fiber-mixer. Spreading further in the expanding part of the mixer-fiber, the rays continue to mix and reduce their tilt angle by uniformly filling the mixer-optical fiber. From the general notation for the optical radiation, npoxq, which is transmitted through the light guide-mixer, the part determined by the expression

TO

S S /

45

where S, is the area occupied by the ends of the receiving light guides; the cross-sectional area of the mixer optical fiber in which the receiving light-S is located, provided that b.j

YES, The value of K ,, is equal to K

D.

one

 §one

determines the part of the optical radiation flux that was not included in the receiving optical fibers. This part of the optical radiation between the receiving light and the expanding part of the mixer optical fiber filled with optically transparent liquid enters the input ends of the additional light guides between the plane of the ends of the receiving light guide and the input ends of the additional light guide. From K, a part of the optical radiation flux of the additional light guides passing to the input ends of the K part of the optical radiation flux enters the additional optical fibers. Consequently,

 K--,

where S 3 is the total area of the ends of the additional light guides in the plane of their input ends;

S is the area of the light guide blender in the plane of the input ends of the additional light guides.

Thus, KK - part of the optical optical flux enters the input ends of the additional light guides and returns to the output ends of the additional light guides located in the input end of the mixer optical fiber in the same plane with the ends of the transmitting optical fibers, the sleeves having increased the power of the optical radiation flux Fd coming into the fiber-mixer on transmitting fibers, on

the value of tg K, K, Thus, according to the light guides will be

15

20

25

thirty

.

to,) - to, to, - PpfK / + C, -Xj)

Repetition of these arguments, we find that the total radiation flux through the fiber-mixer will be equal to

f.9 „+ F, -K, K, F .- (K, .K

...-.(to,)

or

f% -11 (,

The flux of optical radiation entering the receiving optical fibers is

.f.

Claims (1)

Invention Formula An optical signal splitter containing transmitting and receiving optical fiber bundles optically connected by means of a circular section optical fiber having a narrowing section characterized in that, in order to reduce optical losses, additional optical fibers are inserted into the splitter, whose input ends are located between the receiving optical fibers. the harness between them in the extended part of the mixing fiber, and the output ends located between the fibers, redefining the radiation flux equal to. giving harness in the same plane with its end face, whereby the light tube-mixer is made in the form of a hollow body and is filled with a liquid optically transparent medium with a refractive index equal to the refractive index of the core of the optical fibers. ..K.K, (, K, .K, b. A portion of this flux again returns to the light fiber and amplifies the propagating flux by an amount . to,) - to, to, - PpfK / + C, -Xj) Repetition of these arguments, we find that the total radiation flux through the fiber-mixer will be equal to f.9 „+ F, -K, K, F .- (K, .K ...-.(to,) or f% -11 (, The flux of optical radiation entering the receiving optical fibers is .f. Invention Formula An optical signal splitter containing transmitting and receiving optical fiber bundles optically connected by means of a circular section optical fiber having a narrowing section characterized in that, in order to reduce optical losses, additional optical fibers are inserted into the splitter, whose input ends are located between the receiving optical fibers. the harness between them in the extended part of the mixing fiber, and the output ends Fi & 2 Editor A, Revin Compiled by P. Ovn Tehred M. KhodanychKorrektor A. Obruchar Order 776/49 Circulation 522Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production 1 “NNO-polygraphic enterprise, Uzhgorod, U. p. Pro-kgna, 4 9e.5