Abstract

LP<sub>01</sub> and LP<sub>11</sub> mode interferences in high-birefringence (Hi-Bi) panda fibers are theoretically and experimentally presented. The propagation characteristics of both the fundamental and second-order modes in Hi-Bi panda fibers are investigated, and the interference output intensity distribution of the LP<sub>01</sub> and LP<sub>11</sub> modes in panda fibers are thoroughly examined. An experiment is conducted to verify the feasibility of modal interference sensors. The results show that the two-lobe interference pattern of panda fibers generates energy exchanges when external strain is applied on the fiber. Moreover, Hi-Bi panda fibers can be used to design voltage sensors.

© 2012 Chinese Optics Letters

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