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Correct investigation of the statistic irregularities of integrated optical waveguides with the use of the waveguide light scattering

“…The exactitude of reconstructing of the specified ACF of the waveguide irregularities achieved with the help of the outlined quasi-optimum filtration is quite sufficient for reliable determination of the sub wavelength correlation radiuses [10][11][12][13][14]17]. It is shown by the computer modeling, that in case of the Gaussian autocovariance function, when SNR ≥ 100, the surface roughness correlation radius λ/20 may be determined practically without an error [13,14], and the correlation radius λ/30 with an error about 15 %.…”

“…In the second direction phenomenon of waveguide scattering is used for investigation of the irregularities properties themselves and determination of their characteristics and parameters. This division can't be very strict because two aspects of problem are being carried on in the examination [1][2][3][4][5][6][7][8][9][10][11][12][13][14][17][18][19][20][21][22].…”

“…The problem of scattering of the guiding mode in the planar optical waveguide containing stochastic irregularities (Fig. 1) is solved with the help of the theory of perturbations [2,[8][9][10][11][12][13][14]. A solution is sought for in the form of an expansion of an arbitrary radiation field distribution in terms of PWG orthogonal TE or TM modes [10,12,18].…”

“…The intensive development of the integrated optics and optoelectronics during last 30 years promoted the researches of the light scattering in the irregular planar optical waveguides (PWG) from the different points of view [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The integrated optical waveguide is one of basic elements of the integrated optics.…”

“…The laser light scattered in a PWG can be registered as radiated substratecover (substrate-air) and substrate modes ("out-of-plane scattering"), and as the radiation, scattered in the plane of a waveguide ("in plane scattering"). The main task in all cases consists in a correct solution of the direct and inverse scattering problems [8][9][10][11][12][13][14][17][18][19].…”