SU1254336A1 - Method of measuring losses in optical waveguides - Google Patents

Abstract

The invention relates to integrated optics and permits an increase in the accuracy and simplicity of the measurement method. Optical radiation, split into two beams, through the extreme fixed prisms is introduced into the measured waveguide. The intensities of the output radiation are measured at two positions along the waveguide of the third middle prism, a symmetrical, two-way, symmetrical connection, and the waveguide losses are determined. 1 il.

Description

I

The invention relates to integrated optics, to a section for measuring parameters of optical waveguides.

The aim of the invention is to increase the accuracy and simplify the measurement method.

The method is carried out as follows.

Optical radiation is split into two beams, which are inserted into the measured waveguide through the extreme fixed prisms. For the radiation output from the waveguide, a third middle prism is used, made symmetrically with a two-way connection with equal output efficiency. In position I, the middle prism is fulfilled, the conditions

I,,;

I

:

1 o I,

(ABOUT

e I and I, are the intensities of the output radiation from the waveguide, which are carried out with the help of an average prism; I and I - the intensity of input

THAT radiation at the extreme input prisms; H and h - input efficiency

o fl

radiation at the input prisms; - output efficiency

radiation of the middle prism for two-way communication in position I; X and X are the distance between the middle prism and the extreme prisms; d is the attenuation coefficient

light in the waveguide. After moving the middle prism, the distance lH is fulfilled.

to -o1 {X, -LH)

   five

i;

)

(2)

where I j and I,., are the intensities of the outputs: of one radiation. From the waveguide, carried out with the help of an average prism; - output efficiency

radiation of an average prism for two-way communication in position II; m is the fluctuation coefficient of the laser radiation for the time interval between two measurements. From the system of equations (1) and (2), the expression for the loss in an optical waveguide is investigated

51g

e

R lh

20

Claims (1)

Invention Formula A method for measuring losses in optical waveguides, comprising inputting radiation into a waveguide using a prism, moving a prism, and measuring the intensity of the radiation output from the waveguide at different positions of the prism, characterized in that, in order to increase the accuracy and simplify the measurement method, the input the radiation is split into two beams, which are inserted into the waveguide through the outer prisms, a third middle prism, made symmetrically with two-way communication, is installed in two positions along the waveguide, measure the intensities of the output radiation I,  I and I /. 1d and 12. From the third prism, and determine the loss of the waveguide by the formula k-zs. 51g j .j. -, il.i " 4X de ax I, and i; "I ,. moving average prism; output intensity - radiation from the waveguide in the first position; output radiation intensity from the waveguide in the second position. Editor A.Gulko Compiled by P.Ovov n Tehred L. Serdyukova Order 4711 / А5 Circulation 778 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35 Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader L. Patay