Abstract.
The
results of numerical calculation of the outer transverse wave numbers of the
leaking modes of a planar W-fiber in the zones of single-mode and two-mode operating
condition are presented. It is shown that, to guarantee the stability of the
single-mode or multimode operating condition in the desired range of
wavelengths it is necessary to select the geometrical and optical parameters of
the W-fiber so that at the required field concentration in the guiding optical
core to provide effective filtration of the leaking modes. In the present paper
we didn’t set the task to choose the optimal parameters of guiding W-fibers so
that in a given wavelength range λ
the waveguide was single-mode, provided a high field concentration in the main
mode and efficiently filtered the leaking modes. The aim was to show what
changes in the parameters of the waveguide can correct its most important
characteristics.
Key words:
planar
five – layer W-fiber, dispersion relation, cutoff frequency, interlayer refractive
index, outer transverse wave number, loss of leaking modes.
References
1. Wadsworth
W.J., Percival R.M., Bouwmans G., Knight J.C., Birks T.A., Hedley T.D., Russell
P.St.J. Very high numerical aperture fibers. IEEE, Photonics Technology
Letters. 2004. Vol.16. No. 3. PP. 843-845.
2. Otrokhov
S.Yu., Chamorovskiy Yu.K., Shatrov A.D. Leaking Modes of Guiding W-Fibers with
a Large Difference in the Refractive Index Profiles. Journal of
Communications Technology and Electronics. 2010. Vol. 55. No. 10. PP.
1108-1114.
3. Otrokhov
S.Yu., Chamorovskiy Yu.K., Shatrov A.D. Basic Mode Characteristics and the
Contrast Range of the Refractive Index Profile of a W Light Guide. Journal
of Communications Technology and Electronics. 2012. Vol. 57. No. 8. PP.
834-841.
4. Kurbatov
A.M., Kurbatov R.A. New optical W-fiber Panda for fiber optic gyroscope sensitive
coil. Technical Physics Letters. 2010. Vol. 36. No. 9. PP. 789-791.
5. Otrokhov
S.Yu., Chamorovskiy Yu.K., Shatrov A.D. Characteristics of the modes of Planar
W-light guides with Arbitrary Contrast
of the Refractive-Index Profile. Journal of Optical Technology. 2014.
Vol. 81. No. 1. PP. 44-49.
6. Bakhvalov
N.S., Zhidkov N.P., Kobel′kov G.M. Chislennye metody. [Numerical
Methods]. Moscow, Nauka Publ., 1987, 598 p. (In Russian)