Optical filters using bends of optical waveguides

The results of calculations prove the presence of transmission characteristics dependence of optical waveguide bends on wavelength. This fact can successfully be used for creation of optical filters by choice of glass structure, radius and number of bends. The search and synthesis of new glass structures is of interest for this purpose.

INTRODUCTION

Use of fiber lightguides as directing systems is caused by performance of total reflection conditions. One of conditions is excess of critical value of the hade. Thus, the critical angle is defined from expression:

$$\Theta_{c}=\arcsin\left({n_{1}} \left/\vphantom{\sum\limits_{2}^{2}}\right.n_{2}\right), \eqno{\hbox{(1)}}$$ with and - refraction index of the core and cover of fiber lightguide accordingly.