Ring Fiber Lasers for Telecommunication Systems

Fiber Laser Based on Electronically Controlled Phase Plates

“…Fig. 5 shows an experimental study of the dependence of the transmission for the LC cell used in this work on the voltage applied to it [1,2].…”

“…It can be seen from the curve that Uop = 2 V. In the region of voltages greater than U  10 V, the director in the LC volume is completely reoriented at  = 0 angle, that is, the operating voltage range does not exceed 10.5 V: for LC control, the operating voltage range should match 2 V to 10.5 V. For a theoretical study of the polarization control using an LC cell, the solution of the Oseen-Frank equation [1][2][3][4][5][6][7] is used:…”

“…With a fixed position of the quarter-wave plates relative to the axis of the LC cell, namely 78, 88°, the maxima of the transmission of the radiation intensity through the optical axis when the voltage is applied to the LC cell will be 3.9, 7.1, 10 V (Fig. 7) [1,2].…”

“…Traditionally, fiber lasers with nonlinear evolution of polarization state (NEPS) have half-wave and quarter-wave plates in their designs [1,2]. These plates are designed to convert elliptical polarization of radiation into linear and vice versa, as well as to control the angle of rotation of linear polarization in space.…”

“…To get rid of this disad-vantage, it is proposed to use LC cells as polarization controllers (Fig. 1) [1,2].…”