Fiber ring resonator with power exchange between polarization modes: experiment

Experimental results on the characteristics of a new type of fiber ring resonator made with polarizationpreserving fiber are reported. By using a splice inside the loop and crossing the fiber birefringent axes at the splice, we obtain greatly improved thermal stability. Further, by analyzing the output polarization state along the birefringent axes of the fiber, we obtain improved fringe modulation depth, additional improvement in thermal stability, and a simultaneous resonant peak and resonant dip output. A theoretical model is described that gives good agreement with the experiment.