a method of poling and calibrating electro - optic fibers is disclosed . metal electrodes are used to utilize the electro - optic effect to impart phase delays to the optical signal . moreover , one or more electrodes may be used for heating of the device to reach softening temperatures of the electro - optic material , which allows easy , effective and efficient poling of the electro - optic material . a method based on continuous or periodic optical feedback is used to automatically calibrate the electro - optic device when its performance degrades with time to relaxation of molecular orientations .